JP5318059B2 - Control device for air conditioning system and air conditioning system provided with the control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system control device and an air conditioning system including the control device, reducing power consumption for refrigeration/air conditioning during closing time. <P>SOLUTION: This air conditioning system control device includes: a communication section 5a communicating with a refrigerating device 200 for a low-temperature showcase 4 in a shop and an air conditioner 100 for air-conditioning a space in the shop; and a control section 5b controlling the operation of the refrigerating device 200 and air conditioner 100. The control section 5b acquires in-store temperature in the shop during the closing time through the communication section 5a, determines one of first control and second control, having low power consumption during the closing time, based on the acquired in-store temperature, the first control operating only the refrigerating device 200 during the closing time and the second control operating the refrigerating device 200 during the closing time and also operating the air conditioner 100 temporarily, and controls the refrigerating device 200 and air conditioner 100 according to the determined control. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to an air conditioning system control device and an air conditioning system including the control device.

  There exists an example of patent document 1 as a conventional store air-conditioning system. In Patent Document 1, a low-temperature showcase is disposed in a store, and an air conditioner that air-conditions a space in the store is disposed, and these are systems controlled by a control device. In this type of air conditioning system, the air conditioner is generally stopped when the store is closed, and the refrigeration system that supplies cold heat to the showcase is operated continuously for 24 hours so as to keep the interior at a constant temperature for food preservation. ing.

  In the air conditioning system disclosed in Patent Document 1, the set temperature of the air conditioner, which is a load on the showcase in the store, is changed according to the outside air temperature and the air-cooling load ratio (air conditioner / showcase). It was operated so as to reduce the amount of power consumption for refrigeration and air conditioning in the entire store, including the amount of power consumption of the refrigeration equipment in the showcase.

JP-A-11-201523 (summary, FIG. 1)

  However, the conventional air conditioning system has the following problems. In the air conditioning system of Patent Document 1, in order to obtain the optimum operating conditions of the air conditioner and the refrigeration apparatus, it is assumed that the air conditioning load is solar radiation, outside air intrusion by opening / closing the door, lighting, personnel, ventilation, and the like. However, when the store is closed, it is usually nighttime, so there is no solar radiation, and since the store is closed, there is no door opening or personnel, and lighting and ventilation are stopped. For this reason, these loads are almost zero when the store is closed, and the air conditioning load when the store is closed mainly consists of heat stored in the store housing. Therefore, when the store is closed, it is necessary to consider the optimum operation of the air conditioner and the refrigeration device in accordance with the heat stored in the store housing. However, the conventional air conditioning system is not operated in consideration of this point, and there is a problem that the effect of reducing the power consumption for refrigeration air conditioning cannot be obtained.

  The present invention has been made to solve the above-described problems, and includes an air-conditioning system control device capable of reducing power consumption for refrigeration and air-conditioning in a closed time zone, and the control device. The purpose is to obtain an air conditioning system.

The control device of the air conditioning system according to the present invention includes a refrigeration device for a low-temperature showcase in a store and a communication unit capable of communicating with an air conditioner for air conditioning a space in the store, and a control unit for controlling the operation of the refrigeration device and the air conditioner. The control unit obtains an index value indicating a cooling state in the store at the start of the store closing time zone via the communication unit, and operates only the refrigeration apparatus in the closing time zone, and the closing time The index value acquired from the second control in which the refrigeration apparatus is operated in the belt and the air conditioner is also temporarily cooled, and after the temporary cooling operation is finished, the air conditioner is stopped until the closing time is closed. Based on the above, it is determined that the amount of power consumption in the entire closing time period is smaller, and the refrigeration apparatus and the air conditioner are controlled according to the determined control.

  According to the present invention, it is possible to reduce the amount of power consumption for refrigeration and air-conditioning during the closing hours.

It is a store lineblock diagram provided with the air-conditioning system concerning Embodiment 1 of the present invention. It is a block diagram which shows the structure of the refrigerating air-conditioning controller of FIG. It is the figure which showed the driving | running state etc. of the air conditioning system at the time of not operating an air conditioner at the time of a shop closing time slot | zone start. It is the figure which showed the operation state etc. of the air-conditioning system at the time of making an air-conditioner operate | move temporarily in a shop closing time slot | zone. It is a figure which shows the control flowchart in the closing time slot | zone in the freezing air-conditioning controller of FIG.

Embodiment 1 FIG.
FIG. 1 is a store configuration diagram including an air conditioning system according to Embodiment 1 of the present invention.
In FIG. 1, an air conditioner 100 including an outdoor unit 1 and an indoor unit 2 is installed to air-condition the store space A. In the store space A, a low-temperature showcase 4 for cooling food is further installed. The low temperature showcase 4 is a showcase capable of refrigeration or freezing of food inside, and is combined with a condensing unit 3 that is a refrigerator for supplying cold heat into the showcase 4 to constitute a refrigeration apparatus 200. Yes. Although only one showcase 4 is shown in FIG. 1, it is a general configuration that a plurality of showcases 4 are connected in parallel.

  Both the air conditioner 100 and the refrigeration apparatus 200 are apparatuses that generate cold or warm heat by a vapor compression refrigeration cycle driven by a compressor. More specifically, in the air conditioner 100, the air conditioning compressor 6, the outdoor heat exchanger 7, the air conditioning expansion valve 8, and the indoor heat exchanger 9 are connected in an annular shape to constitute a refrigeration cycle. In the refrigeration apparatus 200, the refrigeration compressor 10, the refrigeration condenser 11, the refrigeration expansion valve 12, and the cooling heat exchanger 13 are connected in an annular shape to constitute a refrigeration cycle. In the air conditioner 100, in general, a four-way valve is provided so that air conditioning can be performed so that the flow path can be reversed. However, since only the cooling operation will be described in the first embodiment, The circuit configuration is shown. Further, both the air conditioning compressor 6 and the refrigeration compressor 10 are driven by an inverter, and the operation capacity is controlled.

  In the indoor unit 2, as indicated by a dotted arrow “a” in FIG. 1, air in the store space A is sucked in, and the sucked air is cooled or heated in the indoor heat exchanger 9 to perform air conditioning. In the showcase 4, as shown by a dotted arrow b in FIG. 1, the air in the showcase cabinet is sucked in, the sucked air is cooled by the cooling heat exchanger 13, and the air flow blown out into the showcase cabinet again. Become.

  The temperature sensor 14 a is provided in the indoor unit 2 and measures the air temperature (store temperature) in the store space A sucked into the indoor unit 2. The temperature sensor 14 b is provided in the outdoor unit 1 and measures the outside air temperature around the outdoor unit 1. The temperature sensor 14 c is provided in the cabinet of the showcase 4 and measures the temperature in the cabinet of the showcase 4.

FIG. 2 is a block diagram showing a configuration of the refrigeration air conditioning controller of FIG.
The refrigerating and air-conditioning controller (control device) 5 includes a communication unit 5a and a control unit 5b that controls the entire air conditioning system. The communication unit 5a is communicably connected to a control board (not shown) mounted on each of the outdoor unit 1, the indoor unit 2, the condensing unit 3, and the showcase 4. The control unit 5b collects sensor information and operation information of each device, and also sets the air conditioner 100 based on settings by a user, a control program installed in advance, and a program corresponding to a flowchart shown in FIG. And the operation of the refrigeration apparatus 200 is controlled.

Next, the operation | movement operation | movement of each refrigerating cycle of the air conditioner 100 and the freezing apparatus 200 is demonstrated.
(Refrigeration cycle operation of the air conditioner 100)
In the air conditioner 100, the operation of the cooling operation will be described. The high-temperature and high-pressure gas refrigerant discharged from the air-conditioning compressor 6 flows into the outdoor heat exchanger 7 serving as a condenser, exchanges heat with the surrounding outside air, dissipates heat, and is condensed and liquefied. Thereafter, the refrigerant is decompressed by the air conditioning expansion valve 8 to become a low-pressure two-phase refrigerant, and flows into the indoor heat exchanger 9 serving as an evaporator. The refrigerant that has flowed into the indoor heat exchanger 9 exchanges heat with the in-store air that passes through the indoor heat exchanger 9 and absorbs heat, thereby performing a cooling operation. The refrigerant evaporated and gasified by exchanging heat with the in-store air in the indoor heat exchanger 9 is again sucked into the air conditioning compressor 6.

(Refrigeration cycle operation of the refrigeration apparatus 200)
In the refrigeration apparatus 200, the high-temperature and high-pressure gas refrigerant discharged from the refrigeration compressor 10 flows into the refrigeration condenser 11 serving as a condenser, radiates heat by exchanging heat with the surrounding outside air, and is condensed and liquefied. Thereafter, the refrigerant is decompressed by the refrigeration expansion valve 12 to become a low-pressure two-phase refrigerant, and flows into the cooling heat exchanger 13 serving as an evaporator. The refrigerant flowing into the cooling heat exchanger 13 exchanges heat with the air in the showcase cabinet and absorbs heat, thereby performing a cooling operation. The refrigerant evaporated and gasified by heat exchange with the air in the showcase cabinet by the cooling heat exchanger 13 is again sucked into the refrigeration compressor 10.

(Efficiency (COP) in refrigeration cycle of air conditioner 100 and refrigeration apparatus 200)
In the air conditioner 100, since the in-store air at around 25 ° C. is cooled, the refrigerant temperature in the evaporator functioning as a cold heat source may be about 10 ° C. However, in the refrigeration apparatus 200, it is necessary to cool the interior of the showcase 4 to about 0 ° C. in the refrigeration operation and to about −25 ° C. in the refrigeration operation. For this reason, the evaporator (cooling heat exchanger 13) functions as a cold heat source. The refrigerant temperature is about −10 ° C. when refrigerated and about −40 ° C. when frozen. Since both the air conditioner 100 and the refrigeration apparatus 200 perform heat radiation in the condenser to the outside air, the condensation temperature of the refrigeration cycle is the same. However, since the evaporation temperature is higher in the air conditioner 100, the operation of the refrigeration cycle is generally performed. Efficiency is higher for the air conditioner 100. The efficiency (COP) of the refrigeration apparatus 200 is 2 in the refrigeration operation and about 1 in the refrigeration operation, whereas it is 3 to 4 in the efficiency of the air conditioner 100, and a difference of several times occurs.

Next, the temperature control operation in the air conditioner 100 and the temperature control operation in the refrigeration apparatus 200 will be described in order.
(Temperature control of air conditioner 100)
In the air conditioner 100, the in-store temperature measured by the temperature sensor 14a is controlled to be a temperature set by the user of the air conditioner 100. That is, when the in-store temperature is higher than the set temperature, the operation capacity of the air conditioning compressor 6 is increased to increase the cooling capacity of the air conditioner 100, and the temperature adjustment operation is performed so that the in-store temperature approaches the set temperature. On the other hand, when the in-store temperature is lower than the set temperature, the operation capacity of the air conditioning compressor 6 is decreased to reduce the cooling capacity of the air conditioner 100, and the temperature adjustment operation is performed so that the in-store temperature approaches the set temperature.

(Temperature control of refrigeration apparatus 200)
In the refrigeration apparatus 200, the internal temperature measured by the temperature sensor 14c is controlled to be the temperature set by the user of the refrigeration apparatus 200. That is, the operating capacity of the refrigeration compressor 10 is controlled so that the evaporation temperature of the refrigeration cycle of the refrigeration apparatus 200 becomes the target evaporation temperature determined according to the internal temperature set by the user.

  In the showcase 4, when operating at this target evaporation temperature, the cooling load is less than the refrigeration capacity, and the internal temperature gradually decreases with the operation. When the internal temperature becomes equal to or lower than the set temperature, the operation of the showcase 4 is stopped, and an electromagnetic valve (not shown) upstream of the refrigeration expansion valve 12 is closed. Since the refrigerant stops flowing into the cooling heat exchanger 13 by closing the solenoid valve (not shown), the refrigeration capacity becomes 0, and the temperature inside the showcase chamber gradually increases. When the internal temperature becomes higher than the set temperature by a predetermined value or more, for example, 2 ° C. or more, the refrigeration apparatus 200 of the showcase 4 resumes operation, opens the above-described solenoid valve, and flows the refrigerant to the cooling heat exchanger 13. To. As the operation resumes, the internal temperature of the showcase 4 starts to decrease again. While repeating such an operation, an operation for maintaining the internal temperature of the showcase 4 near the set temperature is performed.

Next, each operation | movement operation | movement of the air conditioner 100 and the freezing apparatus 200 of a shop closing time slot | zone is demonstrated in order.
(Operation of the refrigeration apparatus 200 during the closing time)
The refrigeration apparatus 200 is operated so that the internal temperature is in the vicinity of the set temperature in both the store opening time zone and the closing time zone. The showcase 4 is generally provided with a night cover when the store is closed. Therefore, the cooling load of the showcase 4 during the closing time is smaller than when the store is opened. Therefore, while the internal temperature is likely to decrease, it is difficult to increase, so that the operation time of the showcase 4 is shorter when the store is closed than when the store is opened.

(Operation of the air conditioner 100 during the closing time)
As described above, the air conditioner 100 is operated and controlled so that the in-store temperature becomes the set temperature as described above. In the closed time zone, the power consumption for refrigeration and air conditioning in the entire closed time zone is minimum. Operation is controlled with the aim of becoming. Compared to the case where the store (including the inside of the showcase) is cooled only by the refrigeration apparatus 200 without operating the air conditioner 100 during the closing time (first control), the refrigeration apparatus 200 is operated during the closing time. In addition, when the air conditioner 100 is also temporarily operated (second control), it may be possible to reduce the amount of power consumption for refrigeration and air conditioning in the entire closing time zone. Therefore, which control is appropriate is determined based on the cooling state in the store, and if it is determined to be the second control, the air conditioner 100 is temporarily operated during the closing time. Note that the power consumption for refrigeration and air conditioning is the total power consumption of the power consumption of the refrigeration apparatus 200 and the power consumption of the air conditioning apparatus 100.

  The feature of this embodiment is to determine and decide which of the first control and the second control the power consumption for refrigeration and air conditioning becomes smaller, based on the cooling situation in the store at the start of the closing time period. It is to control the air conditioner 100 and the refrigeration apparatus 200 according to the control. Hereinafter, this control principle will be described. In the first control and the second control, both the controls are operated with respect to the refrigeration apparatus 200, and the difference between the two controls is, in other words, whether or not the air conditioner 100 is operated. Therefore, hereinafter, the operation state of the air conditioning system will be described separately for the case where the air conditioner 100 is not operated during the closing time (first control) and the case where the air conditioner 100 is operated (second control).

FIG. 3 is a diagram illustrating an operation state of the air conditioning system when the air conditioner is not operated at the start of the closing time period. FIG. 3 shows changes in the in-store temperature, start / stop of the air conditioner, and changes in the power consumption of each of the air conditioner and the freezer. Further, a portion A indicated by hatching in FIG. 3 indicates the total power consumption of the refrigeration apparatus 200 during the closing time period. In the following description, the total power consumption of the refrigeration apparatus 200 in the entire closing time zone when the air conditioner 100 is not operated at the start of the closing time zone is referred to as power consumption A.
As described above, both the air conditioner 100 and the refrigeration apparatus 200 are operated when the store is opened, and the in-store temperature is controlled to the set temperature when the store is opened. When the store is opened, there is intrusion of heat from outside such as opening and closing of doors, lighting, personnel, ventilation, etc., so the temperature rise due to the heat is mainly removed by the air conditioner 100, and the in-store temperature is increased by the operation of the air conditioner 100 The set temperature is maintained.

  And if it becomes a shop closing time slot | zone, the air_conditioning | cooling operation of the air conditioner 100 will be stopped, but since the freezing apparatus 200 of the showcase 4 is continuing operation | movement, the in-store temperature falls gradually. That is, since the refrigeration apparatus 200 is continuously operated in the absence of a temperature increase due to the intrusion of heat from the outside, the in-store temperature gradually decreases. However, since the cooling capacity of the refrigeration apparatus 200 is small compared to the air conditioning load, even if the refrigeration apparatus 200 is operated, the in-store temperature does not drop sharply and is almost the same as at the start of the closing time period. In addition, the power consumption of the refrigeration apparatus 200 during the closing time period is lower than that at the time of opening the store by performing night covering as described above.

  When the closing time is about to end (before opening time), employees are present to prepare for opening the store, and the air conditioning load for lighting and ventilation increases, so the in-store temperature rises. Thereafter, when the store opening time is reached, the operation of the air conditioner 100 is started, so that the in-store temperature gradually approaches the set temperature, and then is maintained at the set temperature.

FIG. 4 is a diagram illustrating an operation state of the air conditioning system when the air conditioner is temporarily operated during the closing time period. FIG. 4 shows changes in the in-store temperature, start / stop of the air conditioner, and changes in the power consumption of each of the air conditioner and the freezer. In addition, the broken line of FIG. 4 shows the case where the air conditioner 100 is not operated for comparison. In FIG. 4, a portion B indicated by hatching indicates the total power consumption of the refrigeration apparatus 200 during the closing time zone, and a portion C indicates the total power consumption of the air conditioner 100 during the closing time zone. In the following description, the total power consumption of the refrigeration apparatus 200 in the entire closing time zone when the air conditioning device 100 is operated at the start of the closing time zone is referred to as power consumption B, and the consumption of the air conditioning device 100 at the start of the closing time zone. The amount of power is referred to as power consumption C. FIG. 4 shows an example in which the operation start timing of the air conditioner 100 is set at the start of the store closing time period, and the operation period is set until the temperature decrease width of the in-store temperature reaches the predetermined value T ₀ .

  As shown in FIG. 4, when the air conditioner 100 is air-cooled at the start of the closing time period, the air-conditioning apparatus 100 has a high cooling capacity. Therefore, the in-store temperature is higher than that when only the refrigeration apparatus 200 is operated at the start of the closing time period. Decreases rapidly. Since the cooling load of the refrigeration apparatus 200 is determined by the temperature difference between the in-store temperature in the showcase 4 and the in-store temperature, when the in-store temperature decreases, the cooling load of the refrigeration apparatus 200 decreases. For this reason, the power consumption B is smaller than the power consumption A. In other words, the air conditioner 100 is temporarily operated at the start of the store closing time period, and the store inside the store case is cooled by actively removing heat stored in the store housing, which becomes a cooling load. The cooling load of the refrigeration apparatus 200 of 4 can be reduced and the power consumption B can be kept low.

Here, the amount of power consumption for refrigeration and air conditioning will be examined. First, the power consumption amount C of the air conditioner 100 during the closing time period is the power consumption amount required until the temperature drop width of the in-store temperature reaches the predetermined value T ₀ in this example. Therefore, the power consumption for refrigeration and air conditioning during the closing time is the sum of the power consumption C and the power consumption B on the refrigeration apparatus 200 side. When the air conditioner 100 is operated at the start of the closing time period, the power consumption C for the operation increases compared to the case where the air conditioner 100 is not operated. However, energy saving is achieved when the decrease in power consumption of the refrigeration apparatus 200 (power consumption A-power consumption B) exceeds the increase C.

  Next, attention is paid to the power consumption A of the refrigeration apparatus 200. The higher the in-store temperature at the start of the closing time zone, the greater the cooling load of the refrigeration apparatus 200 that tries to keep the inside of the showcase 4 at the set temperature. That is, since the cooling load of the refrigeration apparatus 200 during the closing time period is determined by the temperature difference between the in-store temperature and the set temperature of the showcase 4, the higher the in-store temperature at the start of the closing time period, the more the power consumption A is growing. Therefore, the higher the in-store temperature at the start of the closing time period, the lower the in-store temperature by operating the air conditioner 100 at the start of the closing time period, thereby reducing the power consumption when the air conditioner 100 is operated and not. The reduction width (power consumption A-power consumption B) can be increased.

  On the other hand, when the in-store temperature at the start of the closing time period is low, the cooling load of the refrigeration apparatus 200 is small and the power consumption of the refrigeration apparatus 200 is also small. For this reason, the reduction width (power consumption A-power consumption B) of the power consumption of the refrigeration apparatus 200 by operating the air conditioner 100 at the start of the closing time period is also small. Thus, the reduction range of the power consumption of the refrigeration apparatus 200 is affected by the in-store temperature at the start of the closing time period. That is, when the in-store temperature is higher than a certain temperature, the power consumption of the refrigeration air conditioner is smaller when the air conditioner 100 is operated, and when the air temperature apparatus 100 is lower than a certain temperature, the refrigeration air conditioner is not operated. The amount of power is reduced. Therefore, by determining in advance a threshold temperature such that power consumption A-power consumption B> power consumption C and determining whether or not the air conditioner 100 needs to be operated based on the threshold temperature, the closing time is determined. Energy saving of the belt becomes possible. This threshold temperature is obtained in advance and stored in the refrigeration air conditioning controller 5.

FIG. 5 is a diagram showing a control flowchart of the store closing time zone in the refrigeration air-conditioning controller of FIG. Although not shown in the flowchart of FIG. 5, the refrigeration apparatus 200 is controlled so that the inside of the refrigerator is close to the set temperature as described above.
First, the refrigerating and air-conditioning controller 5 acquires the detected value (in-store temperature) of the temperature sensor 14a via the communication unit 5a when the opening time ends and the closing time starts (S1). Then, the refrigerating and air-conditioning controller 5 determines whether or not the air conditioner 100 needs to be operated based on the in-store temperature (determines whether the control is the first control or the second control) (S2). That is, it is determined whether or not the in-store temperature is higher than a preset threshold temperature. When the in-store temperature is higher than a threshold temperature (for example, 22 ° C.), it is determined that the air conditioner 100 is required to be operated, and the air conditioner 100 is started to be cooled (S3). When the in-store temperature becomes lower than the end determination temperature (set temperature (here, 22 ° C.) − Predetermined value T ₀ (here, 2 ° C.) = 20 ° C.) (S4), the refrigeration air conditioning controller 5 The operation is terminated (S5). If the in-store temperature is equal to or lower than the threshold temperature in step S2, it is determined that the air conditioner 100 is not operating, and the operation of the air conditioner 100 is stopped.

  Thereafter, the operation of the air conditioner 100 is stopped during the closing time period, and when the store is opened the next morning, the air conditioner 100 is operated or stopped according to an instruction of the user of the air conditioner 100.

  Hereinafter, other examples of indices used for determining whether or not the air conditioner 100 is in operation and determining whether or not the air conditioner 100 is in operation will be sequentially described.

[Other indicators for determining necessity of operation of air conditioner 100]
(In-store temperature and humidity)
The necessity of operation of the air conditioner 100 ultimately depends on the cooling load of the refrigeration apparatus 200 during the closing time, and therefore, the index for determining necessity of operation is not limited to the above-described in-store temperature, but the in-store cooling status (cooling) Other indicators that can determine (load) may be used. For example, the cooling load increases when the in-store humidity is high and decreases when the humidity is low. Therefore, the determination may be made using both the in-store temperature and humidity at the start of the closing time period as index values. That is, when the in-store temperature is higher than the predetermined temperature and the humidity is higher than the predetermined humidity, it is determined that the operation of the air conditioner 100 is performed, and otherwise, it is determined that the operation of the air conditioner 100 is not performed. .

(Enthalpy of store air)
Further, the enthalpy of in-store air may be used as an indicator for determining necessity of driving with the aim of simultaneously evaluating both temperature and humidity. The cooling load increases when the enthalpy of the store air is high, and decreases when the enthalpy is low. Therefore, when the enthalpy of the store air at the start of the closing time period is higher than a predetermined value, it is determined that the air conditioner 100 is operated, and when the enthalpy is low, it is determined that the air conditioner 100 is not operated.

[Threshold for determining necessity of operation of air conditioner 100 (fixed value or variable value)]
The threshold value of the index for determining whether or not the air conditioner 100 needs to be operated may be a fixed value determined in advance as described above, or may be changed as needed depending on the operating conditions. For example, when it is assumed that the power consumption A> the power consumption B + the power consumption C of the refrigeration apparatus 200, the threshold value is changed so that the operation of the air conditioner 100 is more easily performed. Specifically, when the outside air temperature is high, the power consumption A of the refrigeration apparatus 200 is high. Therefore, a threshold for determining necessity of operation, for example, an in-store temperature threshold is set low, and conversely when the outside air temperature is low. Set the in-store temperature threshold high.

  Further, the threshold value may be changed according to the length of the store closing time. The power consumption of the refrigeration apparatus 200 increases as the store closing time increases. Therefore, when the store closing time becomes longer, a threshold for determining necessity of operation, for example, a temperature threshold in the store, is set low so that the operation of the air conditioner 100 is easily performed. Set the in-store temperature threshold high.

  In addition, the threshold value of the operation necessity determination index may be determined in consideration of the relative relationship between the capacity of the refrigeration apparatus 200 (total horsepower) and the capacity of the air conditioner 100. That is, when the capacity (total horsepower) of the refrigeration apparatus 200 installed in the store is relatively large with respect to the capacity of the air conditioner 100, the power consumption of the refrigeration apparatus 200 is relative to the air conditioner 100. Become bigger. Therefore, in order to facilitate the operation of the air conditioner 100, the threshold for determining whether or not the operation is necessary, for example, the in-store temperature threshold is set low, and conversely, when the capacity of the refrigeration apparatus 200 is small, the in-store temperature threshold is set high.

[Operation period of air conditioner 100]
(Operation completion determination based on the integrated value of the cooling capacity of the air conditioner 100)
In the above, the in-store temperature is set as a condition for determining the end of the operation of the air conditioner 100. However, since the operation of the air conditioner 100 aims to remove a predetermined amount of heat stored in the store housing, You may use the other determination parameter | index which can grasp | ascertain calorie | heat amount. For example, when the cooling capacity (kW / h) of the air conditioner 100 is grasped from the operating state of the air conditioner 100, and the integrated value (kW) of the cooling capacity reaches a predetermined value, the operation of the air conditioner 100 is terminated. You may judge. In this case, since the power consumption amount of the air conditioner 100 can be estimated from the cooling capacity of the air conditioner 100, the power consumption amount C required for the operation of the air conditioner 100 and the reduction range of the power consumption amount of the refrigeration apparatus 200 due to the in-store temperature drop ( The balance between power consumption A-power consumption B) can be quantitatively grasped. Therefore, there is an advantage that it becomes easy to set an operation condition that minimizes the power consumption of the refrigeration air-conditioning system during the closing time.

(Operation end determination based on the operation time of the air conditioner 100)
The operation time may be used as a condition for determining the end of the operation of the air conditioner 100. Since the operation time and the cooling capacity of the air conditioner 100 are proportional, the operation time may be obtained and set from the necessary integrated cooling capacity. In this case, if the air conditioner 100 is operated for a predetermined time set in advance, the operation is terminated at that time.

[Operating hours of air conditioner 100]
In the above description, the air conditioner 100 is operated at the start of the closing time period. However, the present invention is not limited to this, and may be operated in any time period as long as the closing time period is set. However, since the power consumption reduction effect of the refrigeration apparatus 200 can be obtained from the time when the in-store temperature decreases due to the operation of the air conditioner 100, the power consumption of the refrigeration apparatus 200 is most reduced when the store is closed. Great effect.

  In addition, even when the shop is closed, if the lighting and ventilation are operated by cleaning up after the shop is closed and the employee is in the room, the air conditioning load increases due to the amount of heat, so the air conditioner 100 power consumption C will increase. Therefore, the timing of starting the operation of the air conditioner 100 may be determined by grasping the presence or absence of an air conditioning load such as lighting and ventilation. That is, after the store closing time, the operation of the air conditioner 100 may be started when the lighting and ventilation are stopped. The determination of the presence or absence of the air conditioning load may be made, for example, by the refrigerating and air conditioning controller 5 taking in the lighting and ventilation operation information and the store closing time information via the communication unit 5a and judging based on the taken in information.

  As described above, in the present embodiment, the store with the smaller power consumption for refrigeration and air-conditioning in the closed time zone is selected between the case where the air conditioner 100 is temporarily operated during the closed time zone and the case where the air conditioner 100 is not operated. It determines based on the inside cooling condition, and controls the operation of the air conditioner 100 based on the determination result. As a result, it is possible to selectively implement energy-saving control in accordance with the cooling situation in the store, and to reduce power consumption for refrigeration and air conditioning during the closing hours including not only the air conditioner 100 side but also the refrigeration apparatus 200 side. can do.

  DESCRIPTION OF SYMBOLS 1 Outdoor unit, 2 Indoor unit, 3 Condensing unit, 4 Showcase, 5 Refrigeration air-conditioning controller, 5a Communication part, 5b Control part, 6 Air-conditioning compressor, 7 Outdoor heat exchanger, 8 Air-conditioning expansion valve, 9 Indoor heat exchange 10, refrigeration compressor, 11 refrigeration condenser, 12 refrigeration expansion valve, 13 cooling heat exchanger, 14a temperature sensor, 14b temperature sensor, 14c temperature sensor, 100 air conditioner, 200 refrigeration apparatus, A store space.

Claims (7)

A communication unit capable of communicating with a refrigeration apparatus for a low-temperature showcase in a store and an air conditioner for air-conditioning the space in the store;
A controller that controls operation of the refrigeration apparatus and the air conditioner,
The controller is
An index value indicating a cooling state in the store at the start of the store closing time zone is acquired via the communication unit;
After the first control for operating only the refrigeration apparatus during the closing time period, the refrigeration apparatus is operated during the closing time period, the air conditioning apparatus is also temporarily cooled, and the temporary cooling operation is terminated. Of the second control for stopping the air-conditioning apparatus until the end of the closing time period, it is determined based on the acquired index value that the power consumption amount in the entire closing time period is smaller, and the refrigeration apparatus according to the determined control And the control apparatus of the air conditioning system characterized by controlling the said air conditioning apparatus.   The said control part implements temporary cooling operation of the said air conditioner in the said 2nd control at the time of the start of a shop closing time slot | zone, The control apparatus of the air conditioning system of Claim 1 characterized by the above-mentioned.   The control unit acquires the in-store temperature in the store as the index value, and when the acquired in-store temperature is higher than a preset threshold value, the control unit determines the second control, and the acquired in-store temperature is equal to or less than the threshold value. 3. The control device for an air conditioning system according to claim 1, wherein the first control is determined.   When the air conditioner is temporarily cooled in the second control, the control unit starts the operation of the air conditioner until the temperature decrease range of the in-store temperature reaches a predetermined value. The control device for an air conditioning system according to any one of claims 1 to 3, wherein the control device is an air conditioning system.   In the second control, when the air conditioner is temporarily cooled in the second control, the controller is configured such that the integrated value of the cooling capacity of the air conditioner after the start of the operation of the air conditioner is a predetermined value. The control device for an air conditioning system according to any one of claims 1 to 3, wherein   2. The control unit according to claim 1, wherein when the air conditioner is temporarily cooled in the second control, the operation period is set to a predetermined time after the operation of the air conditioner is started. The control apparatus of the air conditioning system of any one of Claim 3.   An air conditioning system comprising the control device according to any one of claims 1 to 6, the refrigeration device, and the air conditioning device.

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