JP7100325B2 - Power reduction system for equipment requiring cooling - Google Patents

Description

The present invention turns on and off when the compressor used in the heat pump system is not inverter controlled (does not have an inverter control function or does not use it even if it has one) in places such as supermarkets and department stores that require refrigeration or freezing. It relates to a computer system that reduces the power consumption of refrigerated equipment by controlling it.

Patent Document 1 describes the heat in an air conditioning control device connected to an air conditioner that regulates and blows out a heat medium taken in through a filter by driving a fan with a heat exchanger to which a refrigerant is supplied. The heat measured by the control means for executing the inspection operation of the air conditioner that drives the fan without supplying the refrigerant to the exchanger and the temperature sensor provided in the vicinity of the heat exchanger during the inspection operation. A log data acquisition means for acquiring temperature data indicating the temperature of the exchanger and log data including the time when the temperature was measured, and an inspection processing means for inspecting the filter for clogging based on the acquired log data. The air conditioning control device to be equipped is described.

In Patent Document 2, a control target installed in each cold equipment and an individual switch means individually provided for each control target and controlling each control target on / off are connected to each other. In the control circuit of the cold-requiring device connected in series via the control target and the voltage is applied to the individual switch means, the first from the power supply side terminal and the ground side terminal of the individual switch means, respectively. , The second leader wire is drawn out, and the third and fourth leader wires are drawn out from the power supply side terminal and the ground side terminal of the control target, respectively, and the ground side terminal of the individual switch means and the control target said. The connection line connected to the power supply side terminal is cut, and the fifth leader wire further drawn from the power supply side terminal to be controlled is connected to the second leader wire outside the cold equipment. Moreover, an external individual switch means for controlling on / off of the control target outside the cold equipment is connected to the first and second leader wires drawn from the individual switch means, and the external individual switch means is connected to each of the external individual switch means. A control circuit for a cold-requiring device is described, which is characterized by being integrated in one place outside the cold device.

Japanese Unexamined Patent Publication No. 2020-076558 Jitsuto 3129951 Gazette

In places where cold equipment is used, there is a problem of wanting to reduce power consumption. On the other hand, some motors used in the compressor of the heat pump system are controlled by an inverter, but the inverter always uses electric power, and a disadvantage in power supply may be pointed out.
The inventor of the present invention has devised a control circuit for a cold-requiring device shown in Patent Document 2. Then, by finely controlling the on / off of the compressor that is not inverter control (when the compressor does not have an inverter control function or does not use it even if it has one), it is possible to reduce power consumption, and experiment. Has been repeated.

The present invention has been made in view of such circumstances, and is intended to realize power reduction by adding equipment to an existing cold equipment system.

The power reduction system for cold equipment according to the present invention is
The evaporator, which is a heat exchanger provided inside the cold case, the condenser, which is a heat exchanger provided outdoors, and the refrigerant that has passed through the evaporator are compressed to a high temperature and high pressure to form the condenser. A compressor to send, an expansion valve that rapidly expands the refrigerant that has passed through the condenser to a low temperature and a low pressure, and sends the refrigerant to the evaporator, from the evaporator to the compressor, from the compressor to the condenser, from the condenser. A heat pump system consisting of a pipe connecting the expansion valve to the expansion valve and the evaporator to the evaporator, and a heat pump system.
A cold-required case thermometer with a communication function that measures the temperature inside the cold-required case and transmits the cold-required case temperature information.
A compressor watt-hour meter with a communication function that measures the power consumed by the motor that drives the compressor and transmits the power consumption information.
A power reduction system for a cold-requiring device having a power-reducing computer that controls on / off of a compressor based on the cold-requiring case temperature information from the cold-requiring case thermometer with a communication function.
The power reduction computer is
A communication device that executes communication,
A case temperature information receiving device that receives cold-required case temperature information from the cold-required case thermometer with a communication function,
A power information receiving device that receives the power consumption information of the compressor from the compressor power meter with a communication function, and
A database device that can searchably store information including cold-required case temperature information received by the case temperature information receiving device and power consumption information received by the power information receiving device.
A power reduction plan setting device that enables switching between a plan that turns the compressor on and off based on the cold case temperature information and a plan that keeps the compressor on.
A compressor on / off control circuit that controls the on / off of the compressor,
A control signal generator that generates a control signal to be sent to the compressor on / off control circuit based on the plan set by the power reduction plan setting device and the cold case temperature information.
A power consumption storage device that stores daily power consumption in the database device together with information on which is the outside temperature information or the power reduction plan based on the power consumption information received by the power information receiving device.
With a power reduction performance calculator that calculates the power reduction rate based on the power consumption on days when the outside temperature is close and the power reduction plan is different based on the power consumption stored by the power consumption consumption storage device. ,
The existing system is characterized by having a power reduction plan resetting device that resets a plan set by the power reduction plan setting device based on the power reduction rate calculated by the power reduction rate calculation device. It enables power reduction by adding a minimum of equipment.

The power reduction computer further
When the cold-required case temperature information received by the case temperature information receiving device changes from within the permissible range to out of the permissible range, and when it changes from out of the permissible range to within the permissible range, the maintenance person uses that fact. It is characterized by having an alert mail sending device for notifying an external terminal.
This makes it possible to promptly notify the maintenance person who has an external terminal of the occurrence of an abnormal situation.

The power reduction computer further calculates the power reduction rate based on the power consumption on days when the outside temperature is close and the power reduction plan is different, based on the power consumption stored by the power consumption consumption storage device. Power reduction performance calculation device and
It is characterized by having a power reduction plan resetting device that resets a plan set by the power reduction plan setting device based on the power reduction rate calculated by the power reduction rate calculation device.
This makes it possible to reset the appropriate power reduction plan after confirming the power reduction results.

Further, the power reduction computer is characterized in that it can be connected to a terminal device of a maintenance person in a remote location and can monitor an operating status from a remote location.
As a result, the operation status can be confirmed without the maintenance staff visiting the site.

Further, the power reduction computer is characterized in that it can be connected to a terminal device of a maintenance person in a remote location and can control the power reduction plan resetting device from a remote location.
This allows maintenance personnel to switch between power reduction plans without having to visit the site.

Further, it is characterized in that a plurality of the cold-requiring cases or the heat pump systems exist in the same store, and the power reduction computer controls the plurality of cold-requiring cases or the heat pump systems using a single device. ..
As a result, the power reduction effect can be improved by installing the minimum equipment.

Further, the cold-requiring case thermometer with a communication function or the compressor electric energy meter with a communication function is characterized in that it is installed in one representative of a plurality of cold-requiring cases or a plurality of heat pump systems.
As a result, the power reduction effect can be improved by installing fewer devices.

Further, the power reduction computer is further characterized by having a cost comparison device for comparing power costs due to differences in power reduction plans based on the calculation result of the power reduction actual calculation device.
This makes it possible to create data for comparing the power cost between the case where the on / off control is executed and the case where the on / off control is not performed.

Further, the power reduction computer further has a web page creation device that creates a web page capable of showing the calculation result of the power reduction performance calculation device and the comparison result of the cost comparison device to the outside.
As a result, it is possible to access from the outside and see the power reduction effect.

Further, the power reduction computer further has a personal information disposal device that discards personal information from information to be shown to the outside.
As a result, it is possible to show the power reduction results to prospective customers who want to introduce this power reduction system and customers who are considering it.
Further, the power reduction system is characterized in that a reserve tank is provided on the output side of the compressor, and the output of the reserve tank is supplied to the condenser.
As a result, the refrigerant can be stably supplied even when the compressor is turned off.

Further, the power reduction computer is characterized in that the power reduction plan resetting device operates based on the output of the cost comparison device to reset the power reduction plan.
This allows maintenance personnel to reset to an appropriate power reduction plan and continue operation without having to continue monitoring.

As described above, the power reduction system of the present invention enables power reduction by adding a minimum number of devices to the existing system.

It is a system block diagram which shows the whole of the power reduction system which concerns on this invention. It is a figure which shows the structure of the power reduction computer. Actual results of power reduction This is the measurement result in the first half of May 2019. Actual results of power reduction This is the measurement result in the latter half of May 2019. Results of power reduction This is the measurement result of the first half of August 2019. Actual results of power reduction These are the measurement results in the latter half of August 2019. Results of power reduction This is the measurement result of the first half of November 2019. Actual results of power reduction This is the measurement result in the latter half of November 2019. Results of power reduction This is the measurement result of the first half of February 2020. Actual results of power reduction These are the measurement results in the latter half of February 2020. It is a system configuration diagram when a cold-requiring case has a valve. It is a system block diagram which shows the Example which provided the reserve tank on the output side of a compressor. It is a figure which shows the determination element of the compressor automatic control specification. It is a figure which shows the judgment value of a compressor automatic control specification. It is a figure which shows the new element which the compressor automatic control specification does not have in the conventional cold-requiring equipment. It is a figure which shows which temperature range the current temperature is in relation to other set temperature in a compressor automatic control specification. It is a graph which shows the temperature change by the compressor automatic control. It is a figure which shows the control policy of a compressor automatic control specification. It is a figure which shows the concept of control of a compressor automatic control specification.

Hereinafter, the best mode for implementing the power reduction system for the cold-requiring equipment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 2 are diagrams illustrating embodiments of the present invention, in which the parts with the same reference numerals represent the same objects, and the basic configuration and operation are the same. And.

FIG. 1 is a system configuration diagram showing the entire power reduction system of the present invention. Among the devices shown in FIG. 1, the devices to be added to the existing system are the power reduction computer 10 shown in detail in FIG. 2, the amount of power consumed by the motor of the compressor, and the amount of power (of the compressor) that provides the information. Total 22, measures the temperature inside the cold case and sends the information to the power reduction computer 10 (with communication function) Cold case thermometer 31, measures the outside temperature and sends the information to the power reduction computer 10. It is an outside air thermometer 33 (with a communication function). The outside air thermometer does not necessarily have to be provided inside the system. For example, the temperature of the area announced by the Japan Meteorological Agency may be used.
A heat pump system in which a heat exchanger (evaporator) 25, a defrost heater 32 for removing frost from the heat exchanger (evaporator) 25, and a heat exchanger (evaporator) 25 are combined inside the cold case 30. The compressor 21, the condenser 23, and the expansion valve 24 constituting the 20 are originally in the system of the existing cold-requiring equipment.

FIG. 2 is a diagram showing a configuration in a power reduction computer of the system of the present invention.
The communication device 44 is a device that executes communication with a device that requires communication with the power reduction computer 10, for example, a cold case thermometer 31, an outside air thermometer 33, a power meter 22, and the like. .. Further, the communication device 44 can also enable access from a communication terminal used by a person in charge of maintenance of this system, if necessary.
The outside air temperature information receiving device 45 is a device that receives outside air temperature information periodically, for example, every 6 seconds from the outside air thermometer 33 and stores it in the database device 48.
The case temperature information receiving device 46 is a device that receives case temperature information periodically, for example, every 6 seconds from the cold-requiring case thermometer 31, and stores it in the database device 48.
The electric power information receiving device 47 is a device that receives electric power information sent periodically, for example, every 6 seconds from the electric energy meter 22, and stores it in the database device 48.
The database device 48 is a device that stores various information including outside air temperature information, case temperature information, and electric power information in a searchable state.
The power reduction plan setting device 49 is a device that sets a plan for how to control the on / off of the compressor mainly based on the temperature information. For example, plan 1, plan 2, plan 3, plan 4, plan 5, etc. are prepared in advance (can be customized later to create plan 6, plan 7, etc.). Plan 1 is positioned as a plan to be used during a predetermined period (for example, for one month) when the system starts operating, and the day when the compressor is continuously operated (uncontrolled day) and the on / off are finely divided every day. The plan is to repeat the day (control day) to control the temperature of the equipment requiring cooling so that it falls within a narrow temperature range. For Plan 2, Plan 3, etc., it is possible to create a plan that incorporates various variations and diversity by changing the frequency between non-control days and control days, and by inserting maintenance days. The power reduction plan setting device 49 selects and sets one of such a plurality of plans. The plan set by the power reduction plan setting device 49 includes information on how much temperature range the case temperature information should be set, and the control signal generator 57 described later based on the plan. Generates a control signal to control the compressor 21 (via the compressor on / off control circuit 58). Different temperature ranges are set depending on the type of contents of the case, such as whether the items to be stored in the case are vegetables, beverages, frozen foods, or ice cream.
The alert mail sending device 50 controls the temperature of the cold-requiring device so as to be within a predetermined range by switching the compressor on and off, and the temperature information of the cold-requiring case received by the case temperature information receiving device 46. Is a device that sends a warning mail to the person in charge of maintenance (and related persons) when the temperature exceeds the permissible range (and when the permissible range is returned to the permissible range). This warning mail is issued so that "change from within the allowable range to out of the allowable range" and "change from out of the allowable range to within the allowable range" can be distinguished. For cold equipment that performs defrosting (defrosting, defrosting) systematically, for example, 6 times a day, a warning that "change from within the permissible range to out of the permissible range" is notified when the defrosting is performed. An e-mail is sent, and after a while, when defrosting is completed, a warning e-mail is sent to inform that "change from out of tolerance to within tolerance". When the maintenance personnel receive these paired warning emails, they determine that it is due to defrosting and understand that the system is operating normally. When these paired emails are not sent as a pair, it is judged that an abnormality has occurred and the system is rushed to maintenance.
The power consumption storage device 51 is a device that stores the power consumption of the compressor for each predetermined period (for example, every day) in the database device 48 in association with the information of the outside air temperature at that time.
The power reduction performance calculation device 52 is a device that selects from the numerical values of the power consumption stored by the power consumption storage device 51 and has similar information on the outside air temperature, and calculates how much power can be reduced. be.
The power reduction plan resetting device 53 is a device that resets the power reduction plan (or makes a proposal for it to the customer or the maintenance person) based on the calculation result of the power reduction performance calculation device. For example, Plan 1 is a plan in which non-control days and control days are alternately repeated on a daily basis as described above, and as Plan 7, control in which control days are continued for three days and then non-control days are provided for one day. If a plan to increase the frequency of days is prepared, continue to operate this system in Plan 1, and the power reduction performance calculator will select the one with similar outside temperature information and reduce power consumption by 20% or more. It is possible to accumulate the actual data when it is completed and switch to the plan 7 when it reaches a predetermined number of times (for example, 3 times). The power reduction plan resetting device 53 resets the plan in that case. For example, since the outside temperature is similar between June 1st and June 2nd (for example, the difference is less than 1 degree), when the power reduction results are extracted, the power on the control day is the power on the non-control day. It turned out to be 75% of. This reduction rate is 25%. This is counted as the first time. Looking at it continuously, the outside temperatures are similar between June 5th and June 6th. The actual power reduction is 79%. The reduction rate is 21%. This is counted as the second time. Furthermore, the outside temperatures are similar on June 9th and June 10th. The power reduction rate is 78%. The reduction rate is 22%. Since the number of times that the power can be reduced by 20% has reached a predetermined number (here, 3 times), it is a plan to increase the frequency of the plan (control day) for finely controlling the on / off control from the next day. It is possible to reset to change to plan 7.
The cost comparison device 54 is a device for visualizing the usefulness of this system by comparing the cost of reduced electric power with the cost of introducing this system (for example, a lease fee).
The web page creation device 55 is a device that creates a web page so that information such as the operating status of the power reduction computer and the power reduction rate can be displayed in response to external access.
The personal information disposal device 56 is a device that discards personal information from information to be shown to the outside and converts it into statistical data so that it can be used by other than the direct customer.
The control signal generator 57 is a device that generates a control signal for controlling the compressor 21 based on a plan set by the power reduction plan setting device 49, a plan reset by the power reduction plan resetting device 53, and the like. ..
The compressor on / off control circuit 58 is a circuit that controls the compressor (motor) based on the control signal generated by the control signal generator 57. The control circuit shown in Patent Document 2 can be used.

≪System operation procedure and operation≫
Step 1 First, attach additional equipment such as a thermometer, watt-hour meter, and personal computer (power reduction computer) to the existing system of equipment requiring cooling, and check the necessary wiring and operation of communication exchange.
Step 2 The first month is set as the trial period, and it is based on the conventional operation method, that is, the usage without fine control of on / off (conventional plan), and the temperature information every 6 seconds, for example, alternately every day. By repeating the usage (on-off control plan) to execute the on-off control in detail, the data of how much power consumption will be is recorded together with the outside air temperature data.
Step 3 Examine the performance of power reduction by comparing the data of days with similar outside temperatures.
Step 4 Confirm that the power reduction is as expected (or more), and move to the next plan (plan with continuous on / off control).
You can operate this system by taking four steps.
In addition, if this system is introduced by leasing etc., monthly leasing fee will be incurred, but the merit of continuing this system by comparing the amount with the amount that the monthly power fee is reduced due to power reduction, It can be realized by the functions of the cost comparison device 54, the web page creation device 55, and the personal information disposal device 56 described above.

≪Actual data so far≫
Here is the operational performance data obtained in a supermarket so far.
Figure 3 shows the measurement results of the first half of May 2019 regarding the actual power reduction.
Figure 4 shows the measurement results of the latter half of May 2019 regarding the actual power reduction.
Figure 5 shows the measurement results of the first half of August 2019 regarding the actual power reduction.
Figure 6 shows the measurement results of the latter half of August 2019 regarding the actual power reduction.
Figure 7 shows the measurement results of the first half of November 2019 regarding the actual power reduction.
Figure 8 shows the measurement results of the latter half of November 2019 regarding the actual power reduction.
Figure 9 shows the measurement results of the first half of February 2020 regarding the actual power reduction.
FIG. 10 shows the measurement results of the latter half of February 2020 regarding the actual power reduction.
The control day (the day when the compressor is controlled to be turned on and off based on the cold case temperature information) and the non-control day (the day when the compressor is always operated) are alternately repeated. That is, the day after the control day is a non-control day, and the day after the non-control day is a control day.
In FIG. 4, when the controlled day on May 17 and the non-controlled day on May 18 are compared, the daily average outside temperature of the Japan Meteorological Agency is similar to 20 degrees and 20.3 degrees. Since the total power demand for the cold equipment is 1135.771 kW on the control day and 1525.223 kW on the non-control day, the power on the control day is 74.47% of the power on the non-control day. That is, the reduction rate is 25.53%.
In FIG. 5, when the controlled day on August 1 and the non-controlled day on August 2 are compared, the daily average outside temperature of the Japan Meteorological Agency is similar to 30.5 degrees and 30.2 degrees. Since the total power demand for the cold equipment is 2083.282 kW on the control day and 2506.622 kW on the non-control day, the power on the control day is 83.11% of the power on the non-control day. That is, the reduction rate is 16.89%.
In FIG. 7, when the controlled day on November 3 and the non-controlled day on November 2 are compared, the daily average outside temperature of the Japan Meteorological Agency is similar to 15.8 degrees and 15.7 degrees. Since the total power demand for the cold equipment is 1339.67 kW on the control day and 1568.03 kW on the non-control day, the power on the control day is 85.44% of the power on the non-control day. That is, the reduction rate is 14.56%.
In FIG. 10, when the controlled day on February 17 and the non-controlled day on February 16 are compared, the average outside air temperature is similar to 13.49 degrees and 13.32 degrees. Since the total power demand for the cold equipment is 886.868 kW on the control day and 1210.048 kW on the non-control day, the power on the control day is 73.29% of the power on the non-control day. That is, the reduction rate is 26.71%.
In this way, the effect of power reduction is recognized throughout the year, all spring, summer, autumn and winter. It is recognized that if the cost required for adding this system to existing equipment requiring cooling is set up with a 7-year lease, even if the monthly lease fee is paid, it is possible to reduce power consumption to the extent that it makes a profit.

≪Propose business schemes to customers≫
BCP smart business model: Promote energy-saving and sustainable businesses and support emergency measures for stores and nearby customers.
Who, What, How, Why
Concept: Energy-saving society A sustainable society construction project that contributes to the environment.
Who: Fresh food mass retailer,
What: CO2 emissions of equipment requiring cold & high electricity cost reduction,
How: Compressor supercooling reduction and idling stop by the AI system of Ecocool (service name of power reduction according to the present invention)
This system will be installed after confirming that the power reduction results of 20% or more can be obtained in the test period of 90 days.
Why: The amount of reduction exceeds the introduction cost when using the lease.
Eco-Cool BCP Support The energy-saving business model process consists of the following three steps.
Step 1. Utilize a 7-year lease with a total system of about 6.5 million yen without the need for capital investment.
Step 2. Purchase after confirming the effect Perform the effect verification demo for 3 months and purchase after confirming the reduction from 20%.
Step 3. Increase profits from the month of introduction While paying a monthly lease, the amount of power reduction will exceed and profits will improve.

≪Four issues of conventional cold equipment≫
Issue-1 Cold equipment consumes a large amount of electricity, which puts a heavy burden on the environment (massive CO2 emissions) and costs.
Issue-2 There are many stores (from 20,000 stores in Japan), and it is essential to reduce the environmental load efficiently and effectively here.
Issue-3 In order to provide safe and low-priced food to local residents, measures must be taken with less burden on the store.
Challenge-4 The condition is to support freezing, chilled, leafy / daily foods with cold equipment in 3 different temperature zones.

≪Mission of Eco-Cool: Solutions to the above 4 problems required for energy saving environmental load and cost reduction≫
1. Visualization and reduction of power consumption
Visualization of three categories of temperature zones (compatible with the Agency for Natural Resources and Energy benchmark system of the Ministry of Economy, Trade and Industry). At the same time, AI / artificial intelligence automatically controls supercooling to save energy (reduce electricity consumption by 20%).
2. No capital investment required From the month of introduction to profits By utilizing the revised leasing standards, the monthly reduction in electricity bills exceeds the introduction costs, and store profits have been improved since the month of introduction.
3. Quick detection when a problem occurs The time and place of failure etc. are specified by the sensor thermometer that measures every 6 seconds installed in the equipment requiring cold.
4. Large-scale introduction is possible without the need for capital investment For example, in a chain store with multiple stores (100 stores), it takes about 10 years to prepare and introduce 100 capital investment stores according to conventional business practices. If an emergency occurs three years later, 70 stores will not be able to handle it. Similarly, three years later, 70 stores will not be able to reduce CO2 emissions or costs.
By utilizing leasing, these issues can be dealt with at all 100 stores at the same time from the month of introduction, leading to solutions to the problems. By calculating interest rates, we will achieve an emphasis on sociality rather than an emphasis on immediate profits without burdening the store, and at the same time realize social contribution and improvement in store profits.
It solves the problems that arise in the current financial supreme economy and shows a new way of a sound capitalist economy. That is the structural foundation of the economy necessary for building a BCP sustainable society, and the system that embodies it.

≪About the liquid back phenomenon≫
Generally, in a heat pump system, the refrigerant is gasified and sucked into the compressor. If heat exchange failure occurs for some reason, such as freezing of the heat exchanger inside the cold case, drastic reduction of heat transfer capacity, over-spec during inverter control, or sucking cold air, the refrigerant will be sucked into the compressor in a liquid state. There may be a problem that it will end up. This phenomenon is called a "liquid back phenomenon", and if this state continues, a burning phenomenon of the compressor may occur.
This liquid back phenomenon was seen in an inverter-controlled compressor, and was a source of concern for maintenance companies.
However, this "liquid back phenomenon" never occurred during the period in which the power reduction actual data shown in FIGS. 3 to 10 were obtained using the power reduction system of the present invention.
It is considered to show the superiority of the present invention.

FIG. 11 is a system configuration diagram when the cold requiring case 30 has a valve 38.
The valve 38 is, for example, an electromagnetic valve, which can be electromagnetically controlled to open and close. The valve 38 is provided in the middle of the piping between the expansion valve 24 and the heat exchanger (evaporator) 25, and is opened and closed by electromagnetic means. To open and close the valve, the valve control unit 39 executes a control process of closing the valve when it is too cold and opening the valve when the temperature rises, according to the temperature information from the cold case thermometer 31. The valve control unit 39 operates independently of the power reduction computer 10.
Power reduction When the compressor is not controlled on and off by the computer 10, the valve control unit 39 opens and closes the valve about 50 to 70 times a day in summer and about 1000 times a day in winter. It is known.
Power reduction When the compressor is controlled on and off by the computer 10, it was found from the operation experiment of this system that the valve control unit 39 can open and close the valve about 5 times a day.
Therefore, turning the compressor on and off according to the present invention can be expected to have the effect of preventing wear of the on-off valve (solenoid valve) provided in the cold-requiring case.

≪About the example in which the reserve tank is provided on the output side of the compressor≫
FIG. 12 is a system configuration diagram showing an embodiment in which the reserve tank 29 is provided on the output side of the compressor 21. The reserve tank 29 provides a space for storing the refrigerant in a high temperature and high pressure state, and has a structure capable of withstanding a pressure of, for example, about 10 megapascals. The larger the capacity, the more useful it is in the power reduction system of the present invention. Even when the compressor is turned off, it is possible to continue supplying the refrigerant to the heat pump cycle with the residual pressure of the refrigerant stored in the reserve tank.
In the system configuration diagrams drawn in FIGS. 1, 11, and 12, it is drawn as if there is one compressor and one heat pump cycle, but in an actual store such as a supermarket, it is drawn. Operate 5 to 8 compressors and set the evaporation temperature for each compressor. For example, for a cold drink case, the evaporation temperature is set to -5 ° C in order to raise the temperature inside the refrigerator from 3 ° C to 15 ° C. For the case requiring cold vegetables, the evaporation temperature is set to -10 ° C in order to raise the temperature inside the refrigerator from 2 ° C to 10 ° C. For the cold-required case of fresh meat, the evaporation temperature is set to -17 ° C in order to raise the temperature inside the refrigerator from -5 ° C to 2 ° C. For cold-required cases of chilled foods, the evaporation temperature is set to -30 ° C in order to raise the internal temperature from -12 ° C to -8 ° C. For cold-required cases of frozen foods and ice cream, the evaporation temperature is set to -40 ° C in order to raise the internal temperature from -30 ° C to -18 ° C. In this way, since the evaporation temperature is set for each compressor, a plurality of compressors are operated.

≪Details about compressor automatic control specifications≫
Hereinafter, the compressor automatic control specifications will be described with reference to FIGS. 13 to 19. It is a detail of the control performed by the power reduction computer shown in FIG. 1, FIG. 2, FIG. 11, and FIG.
FIG. 13 is a diagram showing a determination element of the compressor automatic control specification. The case temperature every 6 seconds, the opening and closing of the valve, and the average power amount every 18 seconds are the judgment factors.
FIG. 14 is a diagram showing determination values of the compressor automatic control specifications. Regarding the case temperature, the difference between the current temperature and the temperature 12 seconds ago is determined based on the magnitude relationship with 0.1 degree or minus 0.1 degree. For the valve, determine whether it is open or closed. Regarding the amount of electric power, the difference between the average value from the present to 12 seconds before and the average value from 36 seconds to 48 seconds before is determined in terms of the magnitude relationship with plus 1 watt or minus 1 watt.
FIG. 15 is a diagram showing a new element of the compressor automatic control specification, which is not found in the conventional cold-requiring equipment. The conventional cold-requiring device has two upper limit temperatures and lower limit temperatures and is controlled, whereas in the present invention, the non-control upper limit temperature, the control upper limit temperature, the control upper limit temperature threshold, and the control lower limit temperature threshold are controlled. , Control lower limit temperature and non-control lower limit temperature are used to control the temperature range.
FIG. 16 is a diagram showing in which temperature range the current temperature is in relation to other set temperatures in the compressor automatic control specifications. 0 to 8 indicate the temperature range.
FIG. 17 is a graph showing a temperature change due to automatic compressor control. In the present invention, the temperature zone 4 is controlled so as to be substantially settled.
FIG. 18 is a diagram showing a control policy of the compressor automatic control specification.
FIG. 19 is a diagram showing the concept of control of the compressor automatic control specification.

≪Notes on technical matters that may be useful for correction or division≫
In the power reduction computer shown in FIG. 2, all the functions are provided in one computer, but it is possible to share the power consumption by using a plurality of computers.
Each device on / off control circuit 58 drawn in FIG. 2 is drawn so as to be integrated with a computer, but each device on / off control circuit 58 is provided near the compressor 21 and the defrost heater 32, and the power reduction computer 10 is used. In the meantime, control signals may be exchanged by wireless communication.

The system of the present invention can be used in the maintenance industry of cold equipment and the manufacturing industry of cold equipment.

10 Power reduction computer 20 Heat pump system 21 Compressor 22 (Compressor) electricity meter 23 Condensator 24 Expansion valve 25 Heat exchanger (evaporator)
29 Reserve tank 30 Cold required case 31 Cold required case Thermometer 32 Defrosting heater 33 Outside air thermometer 38 Valve 39 Valve control unit 44 Communication device 45 Outside temperature information receiving device 46 Case temperature receiving device 47 Power information receiving device 48 Database device 49 Power Reduction plan setting device 50 Alert mail transmission device 51 Power consumption storage device 52 Power reduction record calculation device 53 Power reduction plan reset device 54 Cost comparison device 55 Web page creation device 56 Personal information disposal device 57 Control signal generator 58 Compressor on / off Control circuit

Claims (12)

The evaporator, which is a heat exchanger provided inside the cold case, the condenser, which is a heat exchanger provided outdoors, and the refrigerant that has passed through the evaporator are compressed to a high temperature and high pressure to form the condenser. A compressor to send, an expansion valve that rapidly expands the refrigerant that has passed through the condenser to a low temperature and a low pressure, and sends the refrigerant to the evaporator, from the evaporator to the compressor, from the compressor to the condenser, from the condenser. A heat pump system consisting of a pipe connecting the expansion valve to the expansion valve and the evaporator to the evaporator, and a heat pump system.
A cold-required case thermometer with a communication function that acquires cold-required case temperature information by measuring the temperature inside the cold-required case and transmits the cold-required case temperature information.
An outside air thermometer with a communication function that acquires outside air temperature information by measuring the outside air temperature and transmits the outside air temperature information.
A compressor watt-hour meter with a communication function that acquires power consumption information by measuring the power consumed by the motor that drives the compressor and sends the power consumption information to the outside.
A power reduction system for a cold-requiring device having a power-reducing computer that controls on / off of a compressor based on the cold-requiring case temperature information from the cold-requiring case thermometer with a communication function.
The power reduction computer is
A communication device that executes communication,
A case temperature information receiving device that receives cold-required case temperature information from the cold-required case thermometer with a communication function,
An outside air temperature information receiving device that receives outside air temperature information from the outside air thermometer with a communication function,
A power information receiving device that receives the power consumption information of the compressor from the compressor power meter with a communication function, and
A database device that can searchably store information including cold-required case temperature information received by the case temperature information receiving device and power consumption information received by the power information receiving device.
A power reduction plan setting device that enables switching between a plan that turns the compressor on and off based on the cold case temperature information and a plan that keeps the compressor on.
A compressor on / off control circuit that controls the on / off of the compressor,
A control signal generator that generates a control signal to be sent to the compressor on / off control circuit based on the plan set by the power reduction plan setting device and the cold case temperature information.
A power consumption storage device that stores daily power consumption in the database device together with information on which is the outside temperature information or the power reduction plan based on the power consumption information received by the power information receiving device .
Based on the power consumption stored by the power consumption storage device, the outside temperature based on the outside temperature information is approximated, and the power reduction rate is calculated based on the power consumption on different days of the power reduction plan. Achievement calculator and
With the power reduction plan resetting device that resets the plan set by the power reduction plan setting device based on the power reduction rate calculated by the power reduction actual calculation device.
A power reduction system characterized by having. The evaporator, which is a heat exchanger provided inside the cold case, the condenser, which is a heat exchanger provided outdoors, and the refrigerant that has passed through the evaporator are compressed to a high temperature and high pressure to form the condenser. A compressor to send, an expansion valve that rapidly expands the refrigerant that has passed through the condenser to a low temperature and a low pressure, and sends the refrigerant to the evaporator, from the evaporator to the compressor, from the compressor to the condenser, from the condenser. A heat pump system consisting of a pipe connecting the expansion valve to the expansion valve and the evaporator to the evaporator, and a heat pump system.
A cold-required case thermometer with a communication function that acquires cold-required case temperature information by measuring the temperature inside the cold-required case and transmits the cold-required case temperature information.
A compressor watt-hour meter with a communication function that acquires power consumption information by measuring the power consumed by the motor that drives the compressor and sends the power consumption information to the outside.
A power reduction system for a cold-requiring device having a power-reducing computer that controls on / off of a compressor based on the cold-requiring case temperature information from the cold-requiring case thermometer with a communication function.
The power reduction computer is
A communication device that executes communication,
A case temperature information receiving device that receives cold-required case temperature information from the cold-required case thermometer with a communication function,
Using the communication device, the Japan Meteorological Agency outside air temperature information receiving device that receives the area outside air temperature information announced by the Japan Meteorological Agency,
A power information receiving device that receives the power consumption information of the compressor from the compressor power meter with a communication function, and
A database device that can searchably store information including cold-required case temperature information received by the case temperature information receiving device and power consumption information received by the power information receiving device.
A power reduction plan setting device that enables switching between a plan that turns the compressor on and off based on the cold case temperature information and a plan that keeps the compressor on.
A compressor on / off control circuit that controls the on / off of the compressor,
A control signal generator that generates a control signal to be sent to the compressor on / off control circuit based on the plan set by the power reduction plan setting device and the cold case temperature information.
A power consumption storage device that stores daily power consumption in the database device together with information on which is the outside temperature information or the power reduction plan based on the power consumption information received by the power information receiving device .
Based on the power consumption stored by the power consumption storage device, the outside temperature based on the outside temperature information is approximated, and the power reduction rate is calculated based on the power consumption on different days of the power reduction plan. Achievement calculator and
With the power reduction plan resetting device that resets the plan set by the power reduction plan setting device based on the power reduction rate calculated by the power reduction actual calculation device.
A power reduction system characterized by having. The power reduction system according to any one of claims 1 and 2 .
The power reduction computer further
When the cold-required case temperature information received by the case temperature information receiving device changes from within the permissible range to out of the permissible range, and when it changes from out of the permissible range to within the permissible range, the maintenance personnel use that fact. A power reduction system characterized by having an alert mail sending device that notifies an external terminal.
A power reduction system characterized by having. Any one of claims 1 to 3, wherein the power reduction computer can be accessed from a terminal device used by a maintenance person in a remote location, and the operating status can be monitored from the remote location. The power reduction system described in the section. The power reduction computer according to claim 1 or 2, wherein the power reduction computer can be accessed from a terminal device used by a maintenance person in a remote location, and the power reduction plan resetting device can be controlled from a remote location. The power reduction system described in any one of the items . The claim is characterized in that a plurality of the cold-requiring cases or the heat pump systems exist in the same store, and the power reduction computer controls the plurality of cold-requiring cases or the heat pump systems using a single device. The power reduction system according to any one of 1 to 5. The electric power according to claim 6, wherein the cold-requiring case thermometer with a communication function or the compressor electric energy meter with a communication function is installed in one representative of a plurality of cold-requiring cases or a plurality of heat pump systems. Reduction system. The power reduction computer further comprises a cost comparison device for comparing power costs due to differences in power reduction plans based on the calculation result of the power reduction performance calculation device , claim 1, claim 2 or the like. The power reduction system according to any one of claim 5 . The power reduction computer further comprises a web page creation device that creates a web page capable of showing the calculation result of the power reduction performance calculation device and the comparison result of the cost comparison device to the outside. Item 8 is a power reduction system. The power reduction system according to claim 9, wherein the power reduction computer further includes a personal information disposal device that discards personal information from information to be shown to the outside. The power reduction system according to claim 10, wherein the power reduction computer operates the power reduction plan resetting device based on the output of the cost comparison device to reset the power reduction plan. The power reduction system according to claim 1 or 2 , wherein a reserve tank is provided on the output side of the compressor, and the output of the reserve tank is supplied to the condenser.

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