JP2019020070A - Evaluation device and evaluation method for air conditioner - Google Patents

Abstract

To provide a technology for accurately evaluating thermal performance of an air conditioner.SOLUTION: An evaluation device for an air conditioner is used. The evaluation device evaluates the air conditioner including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger and refrigerant piping that is a flow passage of a refrigerant. The evaluation device includes: a performance coefficient acquisition section for acquiring performance coefficients of the air conditioner in a plurality of conditions at least including a normal mode and a high sensible heat mode; and a classification evaluation section for evaluating the performance coefficients. The classification evaluation section classifies the plurality of performance coefficients on the basis of a difference between a dry-bulb temperature of air sucked by the outdoor heat exchanger and a refrigerant evaporation temperature that is a control target of the indoor heat exchanger, and acquires performance characteristics of the air conditioner on the basis of the classified performance coefficients.SELECTED DRAWING: Figure 1

Description

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

  As an air conditioner, a direct expansion type multi-package air conditioner for buildings (a commercial air conditioner) using a heat pump as a heat source is widely used. In recent years, with the implementation of the Energy Conservation Law (Act on the Rational Use of Energy, etc.), the introduction of Top Runner Standards, and the widespread use 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. The methods for obtaining the heat output of an air conditioner include (1) a method for directly measuring the specific enthalpy of air or refrigerant, (2) a method for actually measuring the capacity of the air conditioner under specific conditions, and (3) consumption. There is a method of predicting the heat output of the air conditioner from the measured power value and the device characteristics prepared in advance.

  (1) As a method for directly measuring the specific enthalpy of air or refrigerant, an air enthalpy method or a refrigerant enthalpy method defined in JIS B 8615 is 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 into and out of the heat exchanger of the indoor unit or outdoor unit. However, the air temperature / humidity and wind speed vary greatly around the heat exchanger, making it difficult to select appropriate measurement points.
Regarding the selection of the measurement points, a method of measuring the temperature and humidity around the heat exchanger and the wind speed at multiple points using a flux sampler and a probe sensor has been proposed. Patent Document 1 (Japanese Patent Laid-Open No. 2010-038487) proposes a method for estimating the air volume from the measured value of the fan rotation speed. However, these methods require special sensors and a large number of sensors for measuring temperature and humidity and wind speed. In order to select an appropriate measurement point, it is necessary to investigate the distribution characteristics in advance and confirm the validity of the measurement position.

In the refrigerant enthalpy method, the amount of heat is obtained by measuring the refrigerant pressure, piping temperature, and refrigerant flow rate. However, although the refrigerant pressure and the pipe temperature can be easily measured, it is not easy to measure the flow rate of the refrigerant that is a gas-liquid two-phase flow.
With respect to this refrigerant flow rate measuring method, in Patent Document 2 (Japanese Patent Laid-Open No. 2008-281255), a gas-liquid two-phase flow refrigerant is forcibly cooled and liquefied, and the flow rate is measured with an ultrasonic flowmeter. A method of returning to a gas-liquid two-phase flow by reheating later is proposed. However, in order to carry out this method, advanced measurement and control technology for manipulating gas-liquid two-phase flow is necessary, and since the state is manipulated by applying external energy, the effect on the refrigeration cycle is affected. Concerned.
There are also a compressor curve method and a simple compressor curve method for estimating the refrigerant flow rate from the relationship between the compressor rotation speed and the refrigerant flow rate characteristic. However, since the refrigerant flow rate characteristics are generally not disclosed and are different for each model, necessary information may not be available.

  (2) A method of actually measuring the capacity of an air conditioner under specific conditions is disclosed in, for example, Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2009-150640). In Patent Document 3, it is determined whether the capacity of the air conditioner installed in the actual building is excessive or insufficient by a test for compulsorily 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 ability under specific heat load conditions given in the test.

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

  Therefore, it can be said that obtaining the coefficient of performance and appropriately classifying and evaluating the coefficient of performance under various conditions are effective techniques for grasping the thermal performance of the air conditioner. In particular, in recent years, there are an increasing number of air conditioners such as commercial air conditioners that can be operated in a high sensible heat mode with high energy saving performance in addition to the normal mode. However, when evaluating the thermal performance of an air conditioner, if separate standards must be used for each of the normal mode and the high sensible heat mode, the information processing becomes cumbersome and the user can intuitively determine the thermal performance. It may be difficult to grasp.

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

JP 2010-038487 A JP 2008-281255 A JP 2009-150640 A JP 2007-278618 A JP 2017-048958 A

  The present invention has been made in view of the above problems, and an object thereof 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, an evaluation apparatus that evaluates an air conditioner that includes a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe that is a refrigerant flow path, wherein the evaluation apparatus is at least in a normal mode or A coefficient of performance acquisition unit that acquires a coefficient of performance of the air conditioner under a plurality of conditions including a high sensible heat mode; and a classification evaluation unit that evaluates the coefficient of performance, wherein the classification evaluation unit includes the outdoor heat exchange A plurality of the coefficient of performance are classified based on the difference between the dry bulb temperature of the air sucked into the cooler and the refrigerant evaporation temperature which is a control target of the indoor heat exchanger, and the air conditioner is based on the classified coefficient of performance It is the evaluation apparatus of the air conditioner characterized by acquiring the performance characteristic.
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 in the normal mode and the high sensible heat mode can be uniformly and accurately evaluated.

In the above configuration, the refrigerant evaporation temperature includes 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. Any one of the values converted from the refrigerant pressure in the refrigerant pipe between the valves can be used.
Further, in the above configuration, the dry bulb temperature may be a temperature measured at an air inlet of the outdoor heat exchanger or an outside air temperature of a building where the air conditioner is installed.
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 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 evaluation results based on data acquired by different methods.

The present invention can also employ the following configurations. That 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 that is a refrigerant flow path, wherein the evaluation method includes at least a normal mode or Obtaining a coefficient of performance of the air conditioner under a plurality of conditions including a high sensible heat mode, and a step of evaluating the coefficient of performance. In the step of evaluating, the step of evaluating the coefficient of air sucked into the outdoor heat exchanger A plurality of the coefficient of performance is classified based on the difference between the dry bulb temperature and the refrigerant evaporation temperature that is the control target of the indoor heat exchanger, and the performance characteristics of the air conditioner are obtained based on the classified performance coefficient This is a method for evaluating an air conditioner.
Even with this configuration, the object of the present invention is sufficiently achieved.

  According to the present invention, a technique for accurately evaluating the thermal performance of an air conditioner can be provided.

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 flowchart 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 Mollier diagram for demonstrating the conventional evaluation method. It is a figure explaining the conventional evaluation method. It is another figure explaining the conventional evaluation method.

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

  The present invention can be preferably applied to an air conditioner, an air conditioner control device or an evaluation device, an air conditioner control method or an evaluation method, and the like. The present invention also operates using the computing resources of the information processing device, causes the information processing device to execute each step of the control method or evaluation method of the air conditioning device, and the information processing device is operated by the air conditioning device or its control device or evaluation. It can also be understood as a program that functions as a device or a computer-readable storage medium that stores such a program. The storage medium may be a non-transitory storage medium.

<Specific method of obtaining 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 power meter. On the other hand, the coefficient of performance (apparatus characteristics) may be used if it can be obtained from the manufacturer in the form of an approximate expression or database. However, these 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 obtaining the coefficient of performance of the air conditioner will be explained.

(Configuration of air conditioner)
First, a method for calculating / estimating the coefficient of performance from the measurement result of the actual air conditioner will be described.
FIG. 1 is a schematic configuration diagram of a heat pump type air conditioner. The air conditioner 1 generally 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 the 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 room air. The indoor heat exchanger 101 is also called an evaporator in the cooling mode, and typically has many fins for expanding the heat transfer area made of aluminum or the like outside the metal pipe through which the refrigerant passes. Although it is an attached structure, it is not limited to this. The indoor unit housing is provided with an air inlet 111 and a blower 112. The indoor unit 10 may further include a fan, a filter, a suction temperature sensor, a blowing temperature sensor, an indoor unit control circuit, a remote controller, and the like (not shown) for sending cool air or warm air.

  The outdoor unit 20 includes an outdoor heat exchanger (HEX) 201 that is also referred to as a condenser in the cooling mode for exchanging heat between the refrigerant and the outdoor air, and is similar to the indoor heat exchanger 101. The configuration can be taken. The outdoor unit housing is provided with an air inlet 211 and an outlet 212. The outdoor unit 20 may further include an outdoor fan, a housing provided with an air inlet / outlet, an intake 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 necessary amount of refrigerant while maintaining a refrigerant pressure difference between the indoor heat exchanger 101 and the outdoor heat exchanger 201, and 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 draws in refrigerant, compresses it, and discharges it. As the compressor 50, for example, a variable capacity compressor using a driving motor whose rotation speed is changed by inverter control is suitable, but the compressor 50 is not limited to this.

  The refrigerant pipe 60 is a pipe serving as a flow path through which the refrigerant passes, and is a generic name for the refrigerant pipes 601 to 606 that distribute the refrigerant between the above-described components. 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 operation-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 degree of the expansion valve 40 and the rotation frequency of the compressor 50 are controlled so that the refrigerant temperature (the refrigerant evaporation temperature in the cooling mode) becomes the target value.

  In FIG. 1, reference signs T <b> 1 to T <b> 3 indicate measurement positions of the refrigerant temperature in the refrigerant pipe 60. Reference numerals P1 and P2 indicate measurement positions of the refrigerant pressure. Reference numeral T4 is also a refrigerant temperature measurement position, and a method of using the measured temperature will be described later. Reference numeral T5 is an air temperature measurement position, which will also be described later.

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

The state points 1 to 4 in the Mollier 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: Plotted from low pressure side refrigerant pressure (P1) and compressor inlet temperature (T1) State point 2: Plotted from high pressure side refrigerant pressure (P2) and compressor outlet temperature (T2) State Point 3: Plotted from high-pressure side refrigerant pressure (P2) and condenser outlet temperature (T3). State point 4: Plotted from low-pressure side refrigerant pressure (P1) and calculated evaporation temperature. Evaporation at state point 4 The calculated temperature value can be calculated using a commercially available refrigeration cycle calculation program (database used for pressure-evaporation temperature conversion).

Next, the coefficient of performance in the cooling mode can be acquired by applying the plot results to the following conversion equations (2) to (4).
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 performing the measurement of the refrigerant pressure / temperature and the derivation of the coefficient of performance under various test conditions, data necessary for evaluation of the coefficient of performance can be acquired. For example, it is preferable to define test conditions such as outside air conditions and load conditions in accordance with conditions defined by JIS (Japanese Industrial Standards), guidelines established by the Japan Refrigeration and Air Conditioning Industry Association, but it is not limited thereto.

  In addition to the above method, in Patent Document 4 (Japanese Patent Laid-Open No. 2007-278618), the refrigerant sucked into the compressor, the refrigerant discharged from the compressor, the refrigerant flowing into the heat exchanger, the heat The enthalpy is detected for each refrigerant 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 obtain the coefficient of performance continuously during the operation of the air conditioner. It should be noted that a pressure gauge must be installed in the refrigerant path to measure the refrigerant pressure.

  Further, as a method other than using the actual measurement value, in Patent Document 5 (Japanese Patent Laid-Open No. 2017-048958), a discontinuous coefficient of performance data provided by a manufacturer is used and a representative method is used according to a statistical method. An apparatus characteristic value at a water temperature other than the cooling water temperature is estimated and expressed as a function of the cooling water temperature and the load factor.

<Problems in conventional classification and evaluation of coefficient of performance>
Here, the results of the earnest examination by the applicant regarding the methods of classifying and evaluating the coefficient of performance used conventionally and the problems thereof 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 the 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 obtained as a ratio of output to rated capacity. In the graph, data acquired in each of the normal mode and the high sensible heat mode are shown separately. The rated coefficient of performance (rated COP) of the air conditioner is indicated by an asterisk. FIG. 7 also shows the result of obtaining the approximate expression (order = 3) and the determination coefficient R ^ 2 for each mode of data.

  First, the coefficient of determination in each mode is examined. In general, 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 good. However, in FIG. 7, “R ^ 2 = 0.20” in the normal mode and “R ^ 2 = 0.10” in the high sensible heat mode, and the accuracy of the approximate expression is low.

In addition, when comparing the approximate expressions of the normal mode and the high sensible heat mode, the expressions of both are hardly overlapped, 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 sensible 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. As in FIG. 7, the data acquired in the normal mode and the high sensible heat mode are distinguished from each other, and the rated COP is indicated by an asterisk.

  Also in FIG. 8, the approximate expression (order = 1) and the determination coefficient R ^ 2 were obtained for each mode. Examining the coefficient of determination in each mode, “R ^ 2 = 0.65” in the normal mode and “R ^ 2 = 0.40” in the high sensible heat mode. Although a somewhat good approximation is performed in the normal mode, the accuracy of the approximation is low in the high sensible heat mode. Furthermore, since the approximate expressions of the normal mode and the high sensible heat mode are separated from each other, it is difficult to evaluate both with a uniform standard.

<Embodiment>
An air conditioner according to the present invention, an evaluation apparatus for an air conditioner, and an evaluation method using the evaluation apparatus 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 apparatus 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 includes 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, a workstation, or the like provided with computing resources such as a CPU and a memory, an interface such as a communication unit, an input unit, and a display unit is preferable. A hard disk, SSD, or the like included in the PC can be used as the storage device 82, display means such as a display can be used as the display device 83, and input means such as a mouse or keyboard that can accept user requests can be used as the input device. However, the present invention is not limited to this as long as the function of each block can be achieved. Each block included in the information processing apparatus 81 is configured as a substantial circuit as illustrated, and may be interconnected by a bus, or each may be virtually realized as a program module. In the latter case, each program module uses the computing resources of the PC to operate the PC as the evaluation device 80. A plurality of PCs may cooperate to implement the function of the evaluation device 80.

  The sub-block configuration in the information processing apparatus 81 in the drawing 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 combined to 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 pressure sensor using the communication function of the PC, or acquiring sensing data or the like previously stored in the storage device 82. To 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 data acquired by the data acquisition unit 811, calculated performance coefficients, classification and evaluation results. An output from the information processing device 81 is displayed on the display device 83, and a user who confirms the output result performs an operation using the input device 84, thereby executing desired information processing such as numerical analysis.

(Processing flow)
FIG. 3 is a flowchart for illustrating a processing procedure of the present embodiment. When the evaluation method by the air conditioner evaluation device 80 is started, in step S301, the data acquisition unit 811 determines whether 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 the coefficient of performance is obtained by actual measurement, the process proceeds to step S303, and the pressures at the refrigerant pressure measurement positions P1 and P2 are acquired by the pressure sensor, and the temperatures at the refrigerant temperature measurement positions T1 to T3 are acquired by the temperature sensor. The data acquisition unit 811 acquires temperature data through communication with the sensor. Subsequently, in step S304, the coefficient of performance acquisition unit 812 derives a coefficient of performance based on the plot results of the respective state points 1 to 4 obtained from the measured values and the conversion equations (2) to (4). In addition, you may use the other method mentioned above for acquisition of a performance coefficient.

  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 outdoor unit's suction dry bulb temperature (Tdry [° C]) is measured based on the measured value by the temperature sensor installed in the air suction port 211 (reference numeral T5 in FIG. 1) of the outdoor unit. . In addition, when it is difficult to measure the suction dry bulb temperature due to the installation status of the outdoor unit, the outside air temperature data in the vicinity of the building where the air conditioner is installed may be acquired based on the announcement data of the Japan Meteorological Agency. The data acquisition unit 811 acquires temperature data through communication with the sensor.

  Subsequently, in step S312, the refrigerant evaporation temperature (Teva [° C]) in the indoor unit is acquired. The refrigerant evaporating temperature is a kind of control target of the air conditioner, and when it is described in a format such as a JIS test value in a manufacturer's catalog or the like, the data may be used. Further, some actual measurement may be performed to obtain the refrigerant evaporation temperature. One of the methods obtained from the actual measurement result is a method of directly measuring 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. As another method, the refrigerant pressure obtained by the pressure sensor may be converted into the refrigerant evaporation temperature using a conversion formula. At this time, in the cooling mode, the pressure on the low pressure side (reference P2 in FIG. 1) is measured. As another method, in an old-type air conditioner in which a control target value such as a refrigerant evaporation temperature is fixed, a value obtained by performing measurement only once may be used.

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

  FIG. 4 is a graph illustrating a method for classifying and evaluating the coefficient of performance and expressing the performance characteristics of the air conditioner in the present embodiment. The vertical axis indicates the coefficient of performance (COP) as in FIGS. The horizontal axis represents the difference between the outdoor unit suction dry bulb temperature Tdry 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 sensible heat mode are shown separately. The rated COP is indicated by an asterisk.

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

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

  Returning to FIG. 3, the description will be continued. 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. As a result, the user can continuously grasp the thermal performance of the air conditioner. Note that the performance coefficient and 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, the information processing apparatus 81 may be used for numerical analysis or the like.

  Note that the data required for the present invention such as the refrigerant evaporation temperature and the coefficient of performance is not derived from the catalog value, but is derived based on the actual measurement result from the catalog value of the performance of the air conditioner due to initial failure or aging deterioration. There is an effect to prevent the divergence. It is also preferable to calibrate the data or approximate expression obtained from the catalog value using the actual measurement value. As the calibration timing, it is preferable to ship the air conditioner, install it in a building, or perform regular maintenance.

  As described above, according to the evaluation apparatus 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 a control target, and the dry bulb temperature of the outdoor unit intake air. . As a result, the coefficient of performance in the normal mode and the high sensible heat mode can be evaluated in a unified and accurate approximation formula. Further, it becomes possible to accurately evaluate the heat output and the thermal performance based on the coefficient of performance. Furthermore, since the data necessary for the present invention can be acquired with less time and less effort, it is easy to introduce equipment and perform continuous measurement. The evaluation method using the evaluation apparatus of the present embodiment is effective for performance measurement of air conditioners, periodic maintenance, function maintenance management, and the like. The data obtained by 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 annual simulation etc. and dividing this by the coefficient of performance obtained from the approximate expression obtained in the present invention, the indoor load condition, the outdoor air inflow condition, the target evaporation It is possible to predict the power consumption of commercial air conditioners that take into account three of the temperatures.

  1: air conditioner, 40: expansion valve, 50: compressor, 80: evaluation device, 101: indoor heat exchanger, 600: refrigerant piping

Claims (8)

An evaluation apparatus for evaluating an air conditioner including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchanger, and a refrigerant pipe that is a refrigerant flow path,
The evaluation device has a coefficient of performance acquisition unit that acquires a coefficient of performance of the air conditioner under a plurality of conditions including at least a normal mode or a high sensible heat mode, and a classification evaluation unit that evaluates the coefficient of performance,
The classification evaluation unit classifies a plurality of coefficient of performance based on a difference between a dry bulb temperature of air sucked into the outdoor heat exchanger and a refrigerant evaporation temperature which is a control target of the indoor heat exchanger. An air conditioner evaluation apparatus that acquires performance characteristics of the air conditioner based on the coefficient of performance. The refrigerant evaporating 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. 2. The air conditioner evaluation apparatus according to claim 1, wherein the air conditioner is a value converted from a refrigerant pressure in the refrigerant pipe. The air conditioning according to claim 1 or 2, wherein the dry bulb temperature is a temperature measured at an air inlet of the outdoor heat exchanger or an outside air temperature of a building in which the air conditioner is installed. Equipment evaluation device. The said coefficient of performance acquisition part is a value derived | led-out from the catalog value of the said air conditioner, or the pressure and temperature of the refrigerant | coolant measured in the several position of the said refrigerant | coolant piping. The evaluation apparatus of the air conditioning apparatus of any one of Claims. 5. The air conditioner evaluation according to claim 1, wherein the classification evaluation unit acquires the performance characteristics based on a correlation between the classified coefficient of performance and the difference. 6. apparatus. 6. The air conditioner evaluation apparatus according to claim 5, wherein the classification evaluation unit acquires a determination coefficient between the coefficient of performance and the difference, and evaluates the performance characteristic based on the determination coefficient. The air conditioner further includes a power meter for measuring power consumption of the air conditioner,
The said classification | category evaluation part further acquires the heat output of the said air conditioning apparatus based on the said coefficient of performance and the said power consumption, The evaluation apparatus of the air conditioning apparatus of any one of Claim 1 thru | or 6 characterized by the above-mentioned. . 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 that is a refrigerant flow path,
The evaluation method includes a step of obtaining a coefficient of performance of the air conditioner under a plurality of conditions including at least a normal mode or a high sensible heat mode, and a step of evaluating the coefficient of performance,
In the step of evaluating, a plurality of the coefficient of performance is classified and classified based on a difference between a dry bulb temperature of air sucked into the outdoor heat exchanger and a refrigerant evaporation temperature which is a control target of the indoor heat exchanger. And obtaining the performance characteristics of the air conditioner based on the coefficient of performance.

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