JP6972468B2 - Evaluation device and evaluation method for air conditioners - Google Patents

Description

The present invention relates to an evaluation device and an evaluation method for an air conditioner.

As an air conditioner, a direct expansion type multi-package type air conditioner for buildings (commercial air conditioner) using a heat pump as a heat source is widely used. In recent years, with the enforcement of the Energy Conservation Law (Act on Rationalization of Energy Use, etc.), the introduction of top runner standards, and the spread of ZEB (Zero Energy Building), the heat output of air conditioners has been acquired to improve the thermal performance of buildings. Opportunities to evaluate are increasing. As a method of acquiring the heat output of the air conditioner, (1) a method of directly measuring the specific enthalpy of air or a refrigerant, (2) a method of actually measuring the capacity of the air conditioner under specific conditions, and (3) consumption. There is a method of predicting the heat output of an air conditioner from the measured value of power and the characteristics of equipment prepared in advance.

(1) As a method for directly measuring the specific enthalpy of air or a refrigerant, the air enthalpy method and the refrigerant enthalpy method defined in JIS B 8615 are known.

In the air enthalpy method, the amount of heat is obtained by measuring the air temperature and humidity and the wind speed (air volume) flowing in and out of the heat exchanger of the indoor unit or the outdoor unit. However, it is difficult to select an appropriate measurement point because the air temperature / humidity and wind speed vary widely around the heat exchanger.
Regarding the selection of this measurement point, a method of measuring the temperature and humidity around the heat exchanger and the wind speed at multiple points using a flux sampler or a probe sensor has been proposed. Further, Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-0388487) proposes a method of estimating the air volume from the measured value of the fan rotation speed. However, these methods require a special sensor or a large number of sensors for measuring temperature / humidity and wind speed. In addition, in order to select an appropriate measurement point, it is necessary to investigate the distribution properties in advance and confirm the validity of the measurement position.

In the refrigerant enthalpy method, the amount of heat is obtained by measuring the pressure of the refrigerant, the pipe temperature, and the flow rate of the refrigerant. However, although the refrigerant pressure and the piping temperature can be easily measured, it is not easy to measure the flow rate of the refrigerant which is a gas-liquid two-phase flow.
Regarding this method for measuring the flow rate of the refrigerant, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2008-281255), the refrigerant of the gas-liquid two-phase flow is forcibly cooled and liquefied, and the flow rate is measured and measured by an ultrasonic flow meter. We are proposing a method to return to the gas-liquid two-phase flow by reheating later. However, in order to carry out this method, advanced measurement and control technology for manipulating the gas-liquid two-phase flow is required, and since the state is manipulated by applying external energy, the effect on the refrigeration cycle is affected. I am concerned.
Further, there are a compressor curve method and a simple compressor curve method in which the refrigerant flow rate is estimated from the relationship between the compressor rotation speed and the refrigerant flow rate characteristics. However, since the refrigerant flow rate characteristics are not disclosed to the general public and differ depending on the model, it may not be possible to obtain the necessary information.

(2) A method for actually measuring the capacity of an air conditioner under specific conditions is disclosed in, for example, Patent Document 3 (Japanese Unexamined Patent Publication No. 2009-150640). In Patent Document 3, the excess or deficiency of the equipment capacity of the air conditioner installed in the actual building is determined by a test for forcibly applying a heat load from the outside to grasp the tendency of the operation change of the compressor. However, this method can only measure the capacity under the specific heat load conditions given in the test.

(3) In a method of predicting the heat output of an air conditioner from a measured value of power consumption and a device characteristic prepared in advance, a coefficient of performance (COP) is preferably used as the device characteristic. The coefficient of performance is a performance index showing the energy consumption efficiency of an air conditioner, and is obtained as a cooling capacity or a heating capacity with respect to the power consumption. If the coefficient of performance can be obtained, the heat output can be easily calculated by the following equation (1).
Heat output [kW] = power consumption [kW] x COP ... (1)

Therefore, it can be said that acquiring the coefficient of performance and appropriately classifying and evaluating the coefficient of performance under various conditions are effective methods for grasping the thermal performance of the air conditioner. In particular, in recent years, an increasing number of air conditioners such as commercial air conditioners can be operated in a high open heat mode with high energy-saving performance in addition to the normal mode. However, when evaluating the thermal performance of an air conditioner, if different criteria must be used for each of the normal mode and the high thermal heat mode, the time and effort of information processing becomes complicated and the user can intuitively understand the thermal performance. There is a risk that it will not be possible to grasp.

For the above reasons, there is a demand for a method for appropriately classifying and evaluating the coefficient of performance in order to accurately evaluate the thermal performance of the air conditioner. In particular, there is a need for a method of classifying and evaluating the coefficient of performance in the normal mode and the high thermal heat mode based on a unified standard.

Japanese Unexamined Patent Publication No. 2010-0388487 Japanese Unexamined Patent Publication No. 2008-281255 Japanese Unexamined Patent Publication No. 2009-150640 Japanese Unexamined Patent Publication No. 2007-278618 Japanese Unexamined Patent Publication No. 2017-048958

The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for accurately evaluating the thermal performance of an air conditioner.

In order to achieve the above object, the present invention adopts the following configuration. That is, it is an evaluation device for evaluating an air conditioner including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe which is a flow path of the refrigerant, and the evaluation device is at least in a normal mode or It has a coefficient of performance acquisition unit that acquires the coefficient of performance of the air conditioner under a plurality of conditions including a high thermal heat mode, and a classification evaluation unit that evaluates the coefficient of performance. The classification evaluation unit has the outdoor heat exchange. A plurality of the coefficients of performance are classified based on the difference between the dry ball temperature of the air sucked into the vessel and the refrigerant evaporation temperature which is the control target of the indoor heat exchanger, and the coefficient of performance is classified based on the coefficient of performance. It is an evaluation device for an air conditioner, which is characterized by acquiring the performance characteristics of.
According to this configuration, the coefficient of performance in the cooling mode of the air conditioner can be classified based on the difference between the refrigerant evaporation temperature and the dry-bulb temperature. As a result, the coefficient of performance of the normal mode and the high thermal heat mode can be evaluated uniformly and accurately.

In the above configuration, the refrigerant evaporation temperature is a catalog value of the air conditioner, a value obtained by measuring the temperature of the refrigerant in the refrigerant pipe between the expansion valve and the indoor heat exchanger, and the outdoor heat exchanger and the expansion. It can be one of the values converted from the pressure of the refrigerant in the refrigerant pipe between the valves.
Further, in the above configuration, the dry-bulb temperature can be the temperature measured at the air suction port of the outdoor heat exchanger or the outside air temperature of the building in which the air conditioner is installed.
Further, in the above configuration, the coefficient of performance acquisition unit may be a catalog value of the air conditioner or a value derived from the pressure and temperature of the refrigerant measured at a plurality of positions of the refrigerant pipe.
According to this configuration, data necessary for the characteristic classification and evaluation method of the present invention can be acquired by various methods. As a result, the flexibility of data acquisition is increased, and calibration is also possible by matching the evaluation results based on the data acquired by different methods.

The present invention can also adopt the following configurations. That is, it is an evaluation method for evaluating an air conditioner including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe which is a flow path of the refrigerant, and the evaluation method is at least a normal mode or an evaluation method. It has a step of acquiring the coefficient of performance of the air conditioner and a step of evaluating the coefficient of performance under a plurality of conditions including a high thermal heat mode. A plurality of the coefficients of performance are classified based on the difference between the dry ball temperature and the refrigerant evaporation temperature which is the control target of the indoor heat exchanger, and the performance characteristics of the air conditioner are acquired based on the classified coefficients of performance. It is an evaluation method of an air conditioner characterized by the above.
Even with this configuration, the object of the present invention is fully achieved.

According to the present invention, it is possible to provide a technique for accurately evaluating the thermal performance of an air conditioner.

It is a schematic block diagram of the air conditioner of this invention. It is a block diagram which shows the structure of the evaluation apparatus of this invention. It is a flow figure which shows the procedure of the process of this invention. It is a figure explaining the evaluation method by this invention. It is another figure explaining the evaluation method by this invention. It is a Moriel diagram for explaining the conventional evaluation method. It is a figure explaining the conventional evaluation method. It is another figure explaining the conventional evaluation method.

A preferred embodiment of the present invention will be described below with reference to the drawings. However, the constituent blocks described below and their relative arrangements should be appropriately changed depending on various conditions of the system to which the invention is applied, and the scope of the invention is limited to the following description. It's not a thing.

INDUSTRIAL APPLICABILITY The present invention can be preferably applied to an air conditioner, a control device or evaluation device for an air conditioner, a control method or an evaluation method for an air conditioner, and the like. The present invention also operates by utilizing the computing resources of the information processing apparatus, causes the information processing apparatus to execute each step of the control method or the evaluation method of the information processing apparatus, and causes the information processing apparatus to be the air conditioner or the control apparatus or evaluation thereof. It can also be regarded as a program that functions as a device or a storage medium that can be read by a computer in which such a program is stored. The storage medium may be a non-temporary storage medium.

<Specific acquisition method of coefficient of performance>
In the above formula (1), there is a technique for measuring power consumption relatively easily and with high accuracy, such as measurement with a wattmeter. On the other hand, for the coefficient of performance (equipment characteristics), if it is available from the manufacturer in the form of an approximate expression or a database, that value may be used. However, those values are generally private and may not be available. Therefore, as a premise for explaining the embodiment of the present invention, a specific method for acquiring the coefficient of performance of the air conditioner will be described.

(Configuration of air conditioner)
First, a method of calculating and estimating the coefficient of performance from the measurement results of the actual air conditioner is shown.
FIG. 1 is a schematic configuration diagram of a heat pump type air conditioner. The air conditioner 1 roughly includes an indoor unit 10, an outdoor unit 20, an expansion valve (electronic linear expansion valve: LEV) 40, a compressor (Comp) 50, and a refrigerant pipe 60 through which a refrigerant passes. When the air conditioner 1 operates in the cooling mode, the indoor unit 10 takes heat from the room, and the outdoor unit 20 discharges the heat removed from the room to the outside.

The indoor unit 10 includes an indoor heat exchanger (HEX) 101 for exchanging heat between the refrigerant and the indoor air. The indoor heat exchanger 101 is also called an evaporator in the cooling mode, and typically has a large number of fins made of aluminum or the like on the outside of a metal pipe through which a refrigerant passes to expand a heat transfer area. It is an attached structure, but is not limited to this. Further, the indoor unit housing is provided with an air suction port 111 and an air outlet 112. The indoor unit 10 may also include a fan for sending cold air and warm air, a filter, a suction temperature sensor, a blowout temperature sensor, an indoor unit control circuit, a remote controller, and the like (not shown).

The outdoor unit 20 includes an outdoor heat exchanger (HEX) 201 for exchanging heat between the refrigerant and the outdoor air, which is also called a condenser in the case of the cooling mode, and is similar to the indoor heat exchanger 101. Can be configured as. Further, the outdoor unit housing is provided with an air suction port 211 and an air outlet 212. The outdoor unit 20 may also include an outdoor fan, a housing provided with an air inlet / outlet, a suction temperature sensor, an outlet temperature sensor, an outdoor unit control circuit, an accumulator, and the like (not shown).

The expansion valve 40 is provided to supply a required amount of refrigerant while maintaining the refrigerant pressure difference between the indoor heat exchanger 101 and the outdoor heat exchanger 201, and is provided with an electronic linear expansion valve whose opening degree can be adjusted. Is preferably used, but is not limited thereto. In the cooling mode, the refrigerant flows from the expansion valve 40 to the indoor heat exchanger 101. The compressor 50 sucks in the refrigerant, compresses it, and discharges it. As the compressor 50, for example, a capacity variable compressor using a drive motor whose rotation speed is changed by inverter control is suitable, but the compressor 50 is not limited thereto.

The refrigerant pipe 60 is a pipe that serves as a flow path through which the refrigerant passes, and is a general term for the refrigerant pipes 601 to 606 in which the refrigerant flows between the above-mentioned components. Further, the four-way switching valve 610 switches the direction of the refrigerant flow when the operating state is changed between the cooling mode and the heating mode.

In the operation of the air conditioner 1, the indoor unit 10 is operated and controlled so that the air temperature at the indoor unit air suction port 111 becomes a target value set by a remote controller or the like. At that time, the throttle opening of the expansion valve 40 and the rotation frequency of the compressor 50 are controlled so that the refrigerant temperature (refrigerant evaporation temperature in the cooling mode) becomes a target value.

In FIG. 1, reference numerals T1 to T3 indicate measurement positions of the refrigerant temperature in the refrigerant pipe 60. Further, reference numerals P1 and P2 indicate measurement positions of the refrigerant pressure. The reference numeral T4 is also a measurement position of the refrigerant temperature, and the method of using the measured temperature will be described later. Further, the reference numeral T5 is a measurement position of the air temperature, which will also be described later.

(Derivation of coefficient of performance)
FIG. 6 is a Moriel diagram (P—h diagram) showing a refrigeration cycle, in which the horizontal axis represents the specific enthalpy h (kJ / kg ′) and the vertical axis represents the pressure P (MPa). The starting point is when the refrigerant is at the state point 1. When the refrigerant is sucked into the compressor 50, it is compressed and shifts to the state point 2, resulting in high temperature and high pressure. Next, the refrigerant dissipates heat in the condenser (outdoor heat exchanger 201), condenses, and shifts to the state point 3. Next, the refrigerant is depressurized by the expansion valve 40 and shifts to the state point 4. Next, the decompressed refrigerant absorbs heat in the evaporator (indoor heat exchanger 101) and evaporates, and shifts to the state point 1.

Each state point 1 to 4 in the Moriel diagram of FIG. 6 can be plotted as follows based on the measurement results of the temperature and pressure in the refrigerant pipe 60 of the air conditioner.
・ State point 1: Plot from the low pressure side refrigerant pressure (P1) and compressor inlet temperature (T1) ・ State point 2: Plot from the high pressure side refrigerant pressure (P2) and compressor outlet temperature (T2) ・ State Point 3: Plot from the high pressure side refrigerant pressure (P2) and condenser outlet temperature (T3) ・ State point 4: Plot from the low pressure side refrigerant pressure (P1) and evaporation temperature calculation value Note that evaporation at state point 4 The temperature calculation value can be calculated using a commercially available refrigeration cycle calculation program (database used for conversion of pressure-evaporation temperature).

Next, by applying the above plot results to the following conversion formulas (2) to (4), the coefficient of performance in the cooling mode can be obtained.
Cooling energy [kJ / kg'] = (state point 4-state point 1) ... (2)
Input energy [kJ / kg'] = (state point 2-state point 1) ... (3)
Coefficient of performance [-] = Cooling energy [kJ / kg'] / Input energy [kJ / kg']… (4)
)

By measuring the refrigerant pressure and temperature and deriving the coefficient of performance under various test conditions, the data necessary for evaluating the coefficient of performance can be obtained. For example, it is preferable, but not limited to, the test conditions such as the outside air condition and the load condition are set in accordance with the conditions set by JIS (Japanese Industrial Standards) and the guidelines set by the Japan Refrigeration and Air Conditioning Industry Association.

In addition to the above method, in Patent Document 4 (Japanese Unexamined Patent Publication No. 2007-278618), the suction refrigerant sucked into the compressor, the discharge refrigerant discharged from the compressor, the refrigerant flowing into the heat exchanger, and heat. The enthalpy is detected for each of the refrigerants flowing out of the exchanger, and the coefficient of performance is calculated based on the enthalpy of each refrigerant. In the method of Patent Document 5, it is necessary to constantly measure the refrigerant pressure in order to continuously obtain the coefficient of performance while the air conditioner is in operation. It should be noted that it is necessary to install a pressure gauge in the refrigerant path to measure the refrigerant pressure.

Further, as a method other than using the measured value, in Patent Document 5 (Japanese Unexamined Patent Publication No. 2017-048958), discontinuous coefficient of performance data provided by the manufacturer is used and is represented according to a statistical method. It discloses a method of estimating equipment characteristic values at water temperatures other than the cooling water temperature and expressing them as a function of the cooling water temperature and the load factor.

<Problems in conventional classification and evaluation of coefficient of performance>
Here, the method of classification and evaluation of the coefficient of performance, which has been conventionally used, and the result of the applicant's diligent examination of the problems will be described.

7 and 8 are graphs illustrating a general method for classifying and evaluating the coefficient of performance to express the performance characteristics of an air conditioner. In FIG. 7, the horizontal axis represents the load factor and the vertical axis represents the coefficient of performance (COP). FIG. 7 shows the correlation between the load factor and the coefficient of performance. The load factor is calculated as the ratio of the output to the rated capacity. In the graph, the data acquired in each of the normal mode and the high thermal heat mode are shown separately. In addition, the rated coefficient of performance (rated COP) of the air conditioner is indicated by a star. Further, FIG. 7 also shows the results of obtaining the approximate expression (order = 3) and the coefficient of determination R ^ 2 for each mode data.

First, consider the coefficient of determination in each mode. Generally, if "R ^ 2 = 0.5 to 0.8", the accuracy of the approximate expression is good, and if "R ^ 2 = 0.8 to 1.0", the accuracy is very high. It is said to be good. However, in FIG. 7, it is “R ^ 2 = 0.20” in the normal mode and “R ^ 2 = 0.10” in the high thermal heat mode, and the accuracy of the approximate expression is low.

Further, when the approximate expressions of the normal mode and the high thermal heat mode are compared, both expressions hardly overlap, and the similarity between the two is low. Therefore, in the data classification method of FIG. 7, it is difficult to evaluate the normal mode and the high thermal heat mode with a unified standard.

In FIG. 8, the horizontal axis represents the outdoor unit suction dry-bulb temperature, and the vertical axis represents the coefficient of performance (COP). The outdoor unit suction dry-bulb temperature is obtained by measuring the temperature of the air flowing into the outdoor unit. FIG. 8 shows the correlation between the outdoor unit suction dry-bulb temperature and the coefficient of performance. Similar to FIG. 7, the data acquired in each of the normal mode and the high thermal heat mode are distinguished, and the rated COP is indicated by an asterisk.

Also in FIG. 8, the approximate expression (order = 1) and the coefficient of determination R ^ 2 were obtained for each mode. Examining the coefficient of determination in each mode, it is "R ^ 2 = 0.65" in the normal mode and "R ^ 2 = 0.40" in the high thermal heat mode. The approximation is rather good in the normal mode, but the accuracy of the approximation is low in the high thermal mode. Furthermore, since the approximate expressions of the normal mode and the high thermal heat mode are separated, it is difficult to evaluate both with a unified standard.

<Embodiment>
The air conditioner, the evaluation device of the air conditioner, and the evaluation method using the evaluation device according to the present invention will be described. Also in this embodiment, the air conditioner 1 shown in FIG. 1 is targeted.

(Configuration of evaluation device)
FIG. 2 is a block diagram showing a configuration example of the evaluation device 80 according to the present invention. The evaluation device 80 includes an information processing device 81, a storage device 82, a display device 83, and an input device 84. The information processing apparatus 81 has a data acquisition unit 811, a coefficient of performance acquisition unit 812, and a classification evaluation unit 813. As the evaluation device 80, a PC or a workstation provided with computational resources such as a CPU and a memory and an interface such as a communication means, an input means and a display means is suitable. A hard disk, SSD, or the like provided in a PC can be used as a storage device 82, a display means such as a display can be used as a display device 83, and an input means such as a mouse or a keyboard capable of accepting a user's request can be used as an input device. However, it is not limited to this as long as it can fulfill the function of each block. Each block included in the information processing apparatus 81 is configured as a real circuit as shown in the figure, and may be interconnected by a bus, or each may be virtually realized as a program module. In the latter case, each program module operates the PC as the evaluation device 80 by using the computational resources of the PC. Further, a plurality of PCs may cooperate to realize the function of the evaluation device 80.

The sub-block configuration in the information processing apparatus 81 in the figure is merely an example, and is not limited to this as long as necessary information processing is performed. The evaluation device 80 and the air conditioner 1 may be considered as an air conditioner having an evaluation function.

The coefficient of performance acquisition unit 812 of the information processing apparatus 81 acquires the coefficient of performance under a plurality of conditions based on the data acquired by the data acquisition unit 811. The data acquisition unit 811 acquires data by communicating with the control circuit of the temperature sensor or the pressure sensor by using the communication function of the PC, or acquiring the sensing data or the like stored in the storage device 82 in advance. do. The derived values and the like are classified and evaluated by the classification evaluation unit 813. The storage device 82 stores various data such as the data acquired by the data acquisition unit 811, the calculated coefficient of performance, and the results of classification and evaluation. The output from the information processing device 81 is displayed on the display device 83, and the user who has confirmed the output result performs an operation using the input device 84 to execute desired information processing such as numerical analysis.

(Processing flow)
FIG. 3 is a flow chart for showing the procedure of the processing of the present embodiment. When the evaluation method by the evaluation device 80 of the air conditioner starts, in step S301, the data acquisition unit 811 determines whether or not there is a coefficient of performance provided by the manufacturer. If the determination result is Yes, the process proceeds to step S302, and the coefficient of performance stored in the storage device 82 is acquired. On the other hand, when obtaining the performance coefficient by the measurement of the actual machine, the process proceeds to step S303, the pressure of the refrigerant pressure measurement positions P1 and P2 is acquired by the pressure sensor, and the temperature of the refrigerant temperature measurement positions T1 to T3 is acquired by the temperature sensor. The data acquisition unit 811 acquires temperature data by communicating with the sensor. Subsequently, in step S304, the coefficient of performance acquisition unit 812 derives the coefficient of performance based on the plot results of the state points 1 to 4 obtained from the measured values and the conversion formulas (2) to (4). The other methods described above may be used to obtain the coefficient of performance.

On the other hand, in steps S311 to S312, classification data for use in the evaluation method of the present invention is acquired. First, in step S311, the suction dry-bulb temperature (Tdry [° C]) of the outdoor unit is measured based on the measured value by the temperature sensor installed at the air suction port 211 (reference numeral T5 in FIG. 1) of the outdoor unit. .. If it is difficult to measure the suction dry-bulb temperature due to the installation status of the outdoor unit, etc., the outside air temperature data near the building where the air conditioner is installed may be acquired based on the data released by the Japan Meteorological Agency. The data acquisition unit 811 acquires temperature data by communicating with the sensor.

Subsequently, in step S312, the refrigerant evaporation temperature (Teva [° C]) in the indoor unit is acquired. The refrigerant evaporation temperature is one of the control targets of the air conditioner, and if it is described in the manufacturer's catalog or the like in the form of JIS test value or the like, the data may be used. Further, the refrigerant evaporation temperature may be obtained by performing some actual measurement. One of the methods to obtain from the actual measurement results is to directly measure the refrigerant temperature. In this case, the temperature of the refrigerant is measured by a temperature sensor installed in the refrigerant pipe 605 (reference numeral T4 in FIG. 1) between the expansion valve 40 and the indoor heat exchanger 101. Alternatively, as another method, the refrigerant pressure obtained by the pressure sensor may be converted into the refrigerant evaporation temperature by using a conversion formula. At this time, in the cooling mode, the pressure on the low pressure side (reference numeral P2 in FIG. 1) is measured. As another method, in an old-fashioned air conditioner in which a control target value such as a refrigerant evaporation temperature is fixed, a value obtained by measuring only once may be used.

Subsequently, in step S331, the classification evaluation unit 813 classifies and evaluates the coefficient of performance by the method found by the applicant, which is characteristic of the present invention. This will be described in detail with reference to FIG.

FIG. 4 is a graph illustrating a method of classifying and evaluating the coefficient of performance and expressing the performance characteristics of the air conditioner in the present embodiment. The vertical axis shows the coefficient of performance (COP) as in FIGS. 7 and 8. The horizontal axis is the difference between the suction dry-bulb temperature Tdry of the outdoor unit acquired in S311 and the refrigerant evaporation temperature Teva acquired in S312. Therefore, FIG. 8 shows the correlation between the difference value and the coefficient of performance. In the graph, the data in the normal mode and the high thermal heat mode are shown separately. The rated COP is indicated by an asterisk.

First, when comparing the data groups of the normal mode and the high thermal heat mode, both have the same tendency on the graph. Therefore, in FIG. 4, an approximate expression common to both modes was obtained. The coefficient of determination shows a good value of "R ^ 2 = 0.71", and it can be seen that the accuracy is high. That is, by using the data as shown in FIG. 4 on the horizontal axis, the coefficient of performance obtained in the normal mode and the high thermal heat mode can be classified and evaluated uniformly and accurately. In particular, considering that the coefficient of performance is related to the performance of the air conditioner, it is significant that it becomes easier to evaluate the influence of the dry-bulb temperature, which indicates the outside air temperature, and the refrigerant evaporation temperature, which is the control target value, on the coefficient of performance. be. As described above, according to the present embodiment, the performance characteristics of the air conditioner can be satisfactorily acquired and evaluated.

On the other hand, FIG. 5 is a graph showing an approximate expression theoretically derived from the information provided by the manufacturer, not the measured value. In this case, the coefficient of performance uses the catalog value, the dry-bulb temperature uses the JIS test condition value, and the refrigerant evaporation temperature uses the JIS test value obtained from the manufacturer. Even in this case, the information to be provided is limited. For example, in the case of the cooling mode, only the refrigerant evaporation temperature under the two conditions of the rated cooling standard test and the intermediate cooling medium temperature test is sufficient. On the graph of FIG. 5, the test values obtained by the test under a plurality of conditions are plotted from the viewpoint of calibration. The test values are plotted almost on the approximate formula, and it can be seen that the accuracy of the formula is good.

The explanation will be continued by returning to FIG. In step S321, the data acquisition unit 811 acquires the power consumption of the air conditioner measured by the power meter. Further, if necessary, in step S341, the classification evaluation unit 813 may continuously calculate and evaluate the heat output based on the coefficient of performance and the power consumption. This enables the user to continuously grasp the thermal performance of the air conditioner. The coefficient of performance and the thermal performance classified and evaluated may be displayed on the display device 83 and presented to the user, or may be stored in the storage device 82. Further, it may be used for numerical analysis or the like in the information processing apparatus 81.

It should be noted that the data necessary for the present invention, such as the refrigerant evaporation temperature and the coefficient of performance, can be derived based on the actual measurement results instead of using the catalog values from the catalog values of the performance of the air conditioner due to initial failure or deterioration over time. It has the effect of preventing the divergence of. It is also preferable to calibrate the data obtained from the catalog values and the approximate expression using the measured values. The calibration timing is preferably at the time of shipment of the air conditioner, at the time of installation in a building, at the time of regular maintenance, and the like.

As described above, according to the evaluation device and the evaluation method of the present embodiment, the coefficient of performance of the air conditioner can be classified based on the difference between the refrigerant evaporation temperature, which is also the control target, and the dry-bulb temperature of the outdoor unit suction air. .. As a result, the coefficient of performance of the normal mode and the high thermal heat mode can be evaluated in a unified and accurate approximation formula. In addition, the heat output and heat performance can be evaluated accurately based on the coefficient of performance. Furthermore, since the data required for the present invention can be obtained with less time and less labor, it is easy to introduce equipment and perform continuous measurement. The evaluation method using the evaluation device of the present embodiment is effective for performance measurement of the air conditioner, regular maintenance, maintenance and management of the function, and the like. In addition, the data obtained in the present invention can be used as basic data for numerical analysis and high-efficiency operation. For example, by predicting the air conditioning load in the target space by an annual simulation or the like and dividing this by the coefficient of performance obtained from the approximate formula obtained in the present invention, the indoor load condition, the inflow air condition of the outdoor unit, and the target evaporation It is possible to predict the power consumption of commercial air conditioners in consideration of the three temperatures.

1: Air conditioner, 40: Expansion valve, 50: Compressor, 80: Evaluation device, 101: Indoor heat exchanger, 600: Refrigerant piping

Claims (10)

An evaluation device that evaluates an air conditioner equipped with a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe that is a flow path for the refrigerant.
The evaluation device has a coefficient of performance acquisition unit that acquires the coefficient of performance of the air conditioner under a plurality of conditions including at least a normal mode or a high thermal heat mode, and a classification evaluation unit that evaluates the coefficient of performance.
The classification evaluation unit classifies and classifies a plurality of the coefficients of performance based on the difference between the dry-bulb temperature of the air sucked by the outdoor heat exchanger and the refrigerant evaporation temperature which is the control target of the indoor heat exchanger. An evaluation device for an air conditioner, characterized in that the performance characteristics of the air conditioner are acquired based on the coefficient of performance. The refrigerant evaporation temperature is a catalog value of the air conditioner, a value obtained by measuring the temperature of the refrigerant in the refrigerant pipe between the expansion valve and the indoor heat exchanger, and between the outdoor heat exchanger and the expansion valve. The evaluation device for an air conditioner according to claim 1, wherein the value is any one of the values converted from the pressure of the refrigerant in the refrigerant pipe. The air conditioner according to claim 1 or 2, wherein the dry-bulb temperature is a temperature measured at an air suction port of the outdoor heat exchanger or an outside air temperature of a building in which the air conditioner is installed. Equipment evaluation device. The performance coefficient acquisition unit, catalog value of the air conditioner, or, based on the value derived from the pressure and temperature of the measured refrigerant at a plurality of positions of the refrigerant pipe, to obtain the coefficient of performance <br / > The evaluation device for an air conditioner according to any one of claims 1 to 3, characterized in that. The evaluation of the air conditioner according to any one of claims 1 to 4, wherein the classification evaluation unit acquires the performance characteristics based on the correlation between the classified coefficient of performance and the difference. Device. The evaluation device for an air conditioner according to claim 5, wherein the classification evaluation unit acquires a coefficient of determination between the coefficient of performance and the difference, and evaluates the performance characteristics based on the coefficient of determination. The air conditioner further includes a wattmeter for measuring the power consumption of the air conditioner.
The evaluation device for an air conditioner according to any one of claims 1 to 6, wherein the classification evaluation unit further acquires the heat output of the air conditioner based on the coefficient of performance and the power consumption. .. The coefficient of performance acquisition unit of the evaluation device acquires the coefficient of performance of the air conditioner under a plurality of conditions including the normal mode and the high thermal heat mode.
The evaluation device for an air conditioner according to any one of claims 1 to 7, wherein the air conditioner is evaluated. An evaluation method for evaluating an air conditioner including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe which is a flow path of a refrigerant.
The evaluation method includes a step of acquiring a coefficient of performance of the air conditioner under a plurality of conditions including at least a normal mode or a high thermal heat mode, and a step of evaluating the coefficient of performance.
In the evaluation step, a plurality of the coefficients of performance are classified and classified based on the difference between the dry-bulb temperature of the air sucked by the outdoor heat exchanger and the refrigerant evaporation temperature which is the control target of the indoor heat exchanger. A method for evaluating an air conditioner, which comprises acquiring the performance characteristics of the air conditioner based on the coefficient of performance. In the step of acquiring the coefficient of performance, the coefficient of performance of the air conditioner is acquired under a plurality of conditions including the normal mode and the high thermal heat mode.
The evaluation method for an air conditioner according to claim 9.

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