KR101955812B1 - Capacity performance curves creation method of water-cooled vrf heat pump - Google Patents

Abstract

The present invention relates to a predictive calculation method of a cooling/heating capacity of a VRF heat pump system, and more particularly, to a predictive calculation method of a cooling/heating capacity of a VRF heat pump system, which is capable of calculating a cooling/heating capacity and a power consumption required for estimating a quantitative energy consumption in the VRF heat pump system. According to the present invention, a predictive calculation method of a cooling/heating capacity of a VRF heat pump system, which is capable of calculating a cooling/heating capacity and a power consumption required for estimating a quantitative energy consumption in the VRF heat pump system, calculates the cooling/heating capacity and the power consumption based on the temperature of the cooling water or hot water supplied to the heat pump and the dry-bulb or wet-bulb temperature of the air flowing into an indoor unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for calculating a cooling / heating capability of a VRF heat pump system,

The present invention relates to a predictive calculation method of a cooling / heating capability of a VRF heat pump system, and more particularly, to a cooling / heating capability calculation method of a VRF heat pump system which can calculate a cooling / heating capability required for estimating a quantitative energy consumption in a water- The present invention relates to a method for predicting the cooling / heating capability of a VRF heat pump system.

Before focusing on the world of energy savings and the days around that CO ₂ reduction is the topic of energy savings through a variety of agreements, such as providing a new climate regime (Paris Agreement) to replace the Kyoto Protocol, scheduled to expire in 2020, and CO ₂ reduction It is fitting. However, Korea is one of the energy consuming countries, and the energy consumption is continuously increasing, and the energy consumption of buildings is 20%.

According to the energy census report of the Korea Energy Economics Institute, the energy consumption in the general building occupies about 50% in the air conditioning system due to the cooling / heating consumption. As a result, there is an increasing demand for energy saving in air conditioners in general buildings and various equipment systems are being studied to reduce them.

Recently, a VRF (Variable Refrigerant Flow) heat pump system capable of controlling the flow rate of refrigerant in accordance with characteristics and load of each room can be individually and distributed. In addition, it has been rapidly growing in many countries including Korea as an effective measure to reduce CO ₂ and save energy.

Although many studies related to such VRF heat pump systems are underway, most studies focus only on the performance and comfort control algorithms of VRF systems for specific environments or conditions, and the evaluation of indoor thermal environments. In addition, most studies are concentrated on air-cooled VRF heat pump systems, and there is little research to predict quantitative energy performance under various operating conditions on real buildings and simulations, and lack of research on water-cooled VRF heat pumps. The simulation results show that various variables affecting the indoor environment such as cooling water intake temperature, indoor temperature, wet bulb temperature, cooling and heating power and power consumption, partial load operation condition This is because it is difficult to implement the system efficiency on the simulation.

KR 10-0740257 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a VRF heat pump system which can calculate a cooling and heating capacity necessary for estimating quantitative energy consumption in a water-cooled VRF heat pump system. And a method of calculating a prediction formula of the heating capacity.

According to an aspect of the present invention, there is provided a method for predicting the cooling / heating capability of a water-cooled VRF heat pump system. The water-cooled VRF heat pump includes a single or a plurality of heat sources The present invention relates to a method for predicting quantitative energy consumption in a water-cooled VRF heat pump system for cooling and heating a room by connecting a unit and a plurality of indoor units with piping, Temperature and the dry bulb or wet bulb temperature of the air flowing into the indoor unit.

The prediction formula of the cooling capability (CAPFT _cooling ) during the cooling / heating capability is that the temperature of the cooling water corresponding to the temperature is extracted in the range of 10 to 45 캜 by extracting five or more different temperatures at the wet bulb temperature of the air flowing into the indoor unit And determining an intake temperature of the cooling water whose cooling capability ratio varies based on the cooling capacity ratio calculated based on the wet bulb temperature of the actually measured air and the intake temperature of the cooling water and determines the intake temperature of the cooling water as the inflection point, And a temperature lower than the inflection point temperature is defined as a low temperature section, and is derived from the following equation for each section.

- High temperature section

- low temperature section

Where T _c is the cooling water intake temperature entering the water-cooled VRF heat pump, and T _{WB, avg} is the wet bulb temperature of the air entering the indoor unit.

The prediction equation for the inflection point temperature is derived by the following equation.

The predicted heating capacity of the cooling / heating capacity is determined by extracting five or more different temperatures at the dry bulb temperature of the air flowing into the indoor unit, measuring the temperature of the hot water corresponding to the temperature in the range of 10 to 45 ° C, Determining the temperature of the hot water at which the heating capacity ratio changes in the heating capacity ratio calculated based on the measured dry air temperature of the air and the hot water receiving temperature of the measured air, and determining a temperature higher than the inflection point temperature as the inflow point, And a temperature lower than the inflection point temperature is defined as a low temperature section, and is derived from the following equation for each section.

- High temperature section

- low temperature section

Where T _h is the hot water inlet temperature and T _{DB, avg} is the indoor unit inlet dry bulb temperature.

The prediction equation for the inflection point temperature is derived by the following equation.

delete

delete

delete

delete

delete

delete

delete

According to the predictive calculation method of the cooling / heating capacity of the VRF heat pump system according to the present invention, the cooling / heating capacity and power consumption required for estimating the quantitative energy consumption in the water-cooled VRF heat pump system can be calculated, The introduction of a water-cooled VRF heat pump system has the effect of reducing unnecessary energy use through quantitatively calculated energy consumption.

1 is a conceptual diagram showing a configuration of a VRF heat pump system,
FIG. 2 is a graph showing the cooling capability ratios varying with the cooling water intake temperature and the indoor unit inflow wet bulb temperature,
FIG. 3 is a graph showing the cooling power consumption varying with the cooling water intake temperature and the indoor unit inflowing wet bulb temperature,
4 is a graph showing the cooling power consumption which varies with the partial load ratio,
FIG. 5 is a graph showing a heating capacity ratio varying according to the hot water intake temperature and the indoor unit inlet dry bulb temperature,
6 is a graph showing heating power consumption varying with hot water intake temperature and indoor unit inlet dry bulb temperature,
7 is a graph showing heating power consumption varying according to the partial load factor.

Hereinafter, a method for predicting the cooling / heating capability of the VRF heat pump system according to the present invention will be described in detail with reference to the accompanying drawings.

1. VRF Heat Pump & Simulation Software

1.1 VRF Heat Pump

As shown in FIG. 1, the VRF heat pump is a high-efficiency system that controls a flow rate by connecting a plurality of indoor units (cool units) to a single or multiple heat source units (Cooling Tower and Bioiler) through a refrigerant pipe . It is possible to actively cope with the load variation through each indoor unit and to control the capacity of the outdoor unit according to the load. Among the VRF heat pumps, the water-cooled VRF heat pumps use cooling water at a constant temperature compared to the air-cooling type that was influenced by outdoor conditions such as outside air temperature and building exterior air, so the operation efficiency is good. Especially, since water is exchanged with water refrigerant, the amount of refrigerant transfer is increased even if a compressor combination having the same capacity as that of the air-cooling type is used.

 In addition, the following three performance curves are needed to predict the quantitative energy consumption in the VRF heat pump system. The performance curves are predictive of the change of the cooling and heating capacity and the power consumption according to the change of the temperature and the partial load ratio.

- Performance curve of power ratio change according to temperature change of cooling water, hot water, and indoor gun and wet bulb temperature

- Performance curves of cooling and heating capacity ratio with cooling water, hot water intake temperature, indoor gun and wet bulb temperature change

- Performance curve of cooling / heating power consumption ratio change with partial load ratio change

1.2 Simulation software

In the present invention, the research was conducted based on simulation software called EnergyPlus which can be mathematically verified for the heating and cooling load analysis and thermal environment developed by the US Department of Energy. The EnergyPlus uses the heat balance equation recommended by ASHRAE of the American Refrigeration and Air Conditioning Society, which has the advantage of enabling dynamic analysis of heat conduction and radiation and convective heat transfer in an abnormal state. In particular, since Version 7.0 or later, it is possible to analyze the VRF heat pump system of the system air conditioner to be analyzed in the present invention, so that the performance curve necessary for accurately implementing the water-cooled VRF heat pump system used in the present invention can be applied to the simulation There are advantages.

2. Cooling Mode

2.1 Cooling Capacity

The cooling capacity of the water-cooled VRF heat pump varies depending on the intake temperature of the cooling water entering the heater and the wet bulb temperature of the air flowing into the indoor unit. FIG. 2 is a graph showing the relationship between the cooling water inlet temperature (inlet water temperature) and the inlet air temperature of the indoor unit, which is the cooling capacity ratio of the VRF heat pump system CAPFT _Cooling ). In FIG. 2, 'WB' denotes the wet bulb temperature of the air flowing into the indoor unit.

Also, in FIG. 2, a low temperature curve and a high temperature curve are divided according to a cooling water intake temperature around an inflection point (a boundary curve).

This is because the cooling capacity ratio (CAPFT _cooling ) at a low temperature curve (low temperature curve) in which the cooling water intake temperature is low is influenced only by the inlet wet bulb temperature of the indoor unit, while in the case of the high temperature curve, This is because the temperature is affected by both variables. Therefore, in order to calculate the cooling capacity ratio (CAPFT _cooling ) of the water-cooled VRF heat pump system, it is necessary to derive the respective performance curves according to the three temperature ranges.

The high temperature curve is expressed by the following equation (1).

In the case of a High Temperature Curve in which the cooling water intake temperature is increased on the basis of the inflection point in FIG. 2, CAPFT _Cooling is defined as a quadratic quadratic equation as shown in Equation (1). Here, T _c in Equation (1) represents the temperature of the cooling water intake water entering the water-cooled VRF heat pump, and T _{WB, avg} represents the wet bulb temperature of the air flowing into the indoor unit.

Since the CAPFT _cooling rate in the high temperature curve is affected not only by the indoor wet bulb temperature (T _{WB, avg} ) but also by the cooling water intake temperature (T _C ), the two variables are considered together Should be calculated. The cooling water intake temperature (T _C ) is 30 ° C and the indoor air inlet wet bulb temperature (T _{WB, avg} ) is 19 ° _C based on the TDB data in the rated cooling capacity (CAPFT _cooling = 1.0) . You may calculate the cooling capacity ratio (CAPFT _Cooling) which change according to the basis as cooling water to obtain the temperature and the indoor unit inlet wet-bulb temperature, the cooling capacity ratio (CAPFT _Cooling) corresponding to each temperature after substituting in the formula 1; The respective coefficients a, b, c, d, e, and f can be derived.

The inflection point (Boundary Curve) is shown in Equation (2).

In FIG. 2, the inflection point section represents a boundary point at which the cooling capability pattern is divided into a low temperature curve and a high temperature curve according to a change in the cooling water intake temperature T _C. Equation 2 is defined as a simultaneous cubic equation of the cooling water intake temperature with respect to the indoor unit inflow wet bulb temperature (T _{WB, avg} ), and the cooling water intake temperature (T _{WB, avg} ) It can be substituted into the (T _C) to equation (2) to derive the respective coefficients a, b, c, d.

The low temperature curve (Low Temperature Curve) is shown in Equation (3).

As shown in FIG. 2, inflection points (Boundary Curve) of the cooling water obtained temperature is lower region of the low-temperature period reference interval (Low Temperature Curve) cooling capacity ratio (CAPFT _Cooling) of the indoor unit inlet wet-bulb temperature (T _WB as previously described above _{, avg} ). Therefore, the low temperature curve is the same as that of the high temperature curve (Equation 1), but the cooling capacity is not influenced by the cooling water intake temperature T _C , and the indoor temperature inflow wet bulb temperature (T _{WB, avg} ) The values of the coefficients d, e, and f are determined to be 0, which is defined as Equation (3). Also _, the cooling capacity ratio (CAPFT _Cooling ) which varies according to the indoor unit inflow wet bulb temperature (T _{WB, avg} ) under the same rating condition as the high temperature curve (High Temperature Curve) is calculated, , b, c can be derived.

2.2 Cooling Energy Input: Temperature

It can be seen that the cooling power consumption in the water-cooled VRF heat pump system also changes with the cooling water intake temperature (T _C ) and the indoor unit inlet wet bulb temperature (T _{WB, avg} ). FIG. 3 shows the energy input ratio function of temperature (hereinafter referred to as "EIRFT _cooling" ), which varies with the _cooling water inlet temperature and the inlet air temperature of the indoor unit, compared with the rated conditions of the VRF heat pump system during cooling, based on the water- . However, unlike the cooling capacity, the inflection point (Boundary Curve) which can distinguish the low temperature interval (High Temp Curve) from the low temperature interval (High Temp Curve) is not clear for the cooling power consumption ratio.

Therefore, it is considered that there is no problem in the accuracy of the cooling power consumption performance curve even if only one performance curve is calculated for the cooling water intake temperature (T _C ) section.

EIRFT _Cooling is defined by a quadratic quadratic equation which changes according to the cooling water intake temperature T _C and the indoor unit inlet wet bulb temperature T _{WB, avg} as shown in Equation (4). In order to derive the _cooling power ratio (EIRFT _cooling ), the power consumption (PI) in the rated condition must be selected. Based on the TDB data, the rated conditions are as follows: the cooling water intake temperature (T _C ) is 30 ° C, the indoor wet bulb temperature (T _{WB, avg} ) is 19 ° C and the cooling water intake temperature It is possible to calculate the _cooling power consumption ratio (EIRFT _cooling ) that varies depending on the temperature T _C of the indoor unit and the inlet wet bulb temperature T _{WB, avg of the} indoor unit. B, c, d, e, and e are obtained by substituting the _cooling power consumption ratio (EIRFT _Cooling ) that varies depending on the cooling water intake temperature T _C and the indoor unit inflow wet bulb temperature T _WB , f can be derived.

2.3 Cooling Energy Input: Part-Load Ratio

The performance curves for cooling power consumption in the water-cooled VRF heat pump system are affected not only by the cooling water intake temperature (T _C ) and the indoor unit inlet wet bulb temperature (T _{WB, avg} ), but also by the partial load ratio as shown in FIG. Here, the partial load ratio refers to a cooling load ratio to be removed from the indoor unit with respect to the cooling capacity varying according to the cooling water intake temperature (T _c ) coming into the heat pump and the wet bulb temperature of the air flowing into the indoor unit. The Energy Input Ratio Function (EIRFPLR _Cooling ) according to the partial load ratio means a ratio of the power consumption that varies with the partial load ratio change with respect to the power consumption (PI) under the rated condition. In addition, the cooling power consumption according to the partial load ratio can be confirmed through the water-cooled VRF TDB data of the domestic company, and the cooling power consumption ratio (EIRFPLR _cooling ) that varies with the partial load ratio is defined by the following equation (5).

The cooling power consumption performance curve according to the partial load ratio is expressed by Equation (5) and is defined when the partial load ratio of the VRF system is 100% or less. In addition, as shown in [Table 1], the cooling capacity according to the partial load ratio was confirmed through the TDB data and the power consumption ratio according to each partial load ratio to the cooling power consumption under the condition that the partial load ratio was 100% was calculated.

Cooling EIRFPLR Cooling Power (kW) Normailzed EIRFPLR PLR PLR ² PLR ³ 1.83 0.438 0.5 0.25 0.125 2.37 0.567 0.6 0.36 0.216 2.92 0.699 0.7 0.49 0.343 3.53 0.844 0.796 0.633 0.503 3.94 0.943 0.896 0.802 0.718 4.18 One One One One

delete

Then, the coefficients a, b, c, and d can be derived by substituting EIRFPLR _cooling , which changes according to the partial load ratio, into [Equation 5]. For reference, the intermediate calculation procedure of the PLR and EIRFPLR _cooling of the representative water-cooled VRF model for the creation of FIG. 4 is shown in Table 1 above.

3. Heating Mode

3.1 Heating Capacity

In the heating mode, the heating capacity ratio (CAPFT _heating ) of the water-cooled VRF heat pump is determined by the temperature of hot water (T _h ) entering the heat pump and the dry bulb temperature (T _{DB, avg} ) of the air flowing into the indoor unit Changes. FIG. 5 shows the heating capacity ratio (CAPFT _Heating ) which varies according to the hot water intake temperature (T _h ) during heating and the indoor unit inlet dry bulb temperature (T _{DB, avg} ) of the VRF heat pump based on the water-cooled VRF TDB data of domestic S company . In FIG. 5, 'DB' denotes the dry bulb temperature of the air flowing into the indoor unit.

The CAPFT _heating is the same as the CAPFT _cooling in that a low temperature curve and a high temperature curve corresponding to the hot water intake temperature T _h are determined based on the inflection point interval, ). However, in contrast to the cooling mode, in the case of the high temperature curve of the heating mode, there is no change in the heating capacity ratio due to the hot water intake temperature (T _h ) and only the influence of the indoor dryer inlet bulb temperature (T _{DB, avg} ) In case of Low Temperature Curve, it is influenced both by hot water intake temperature (T _h ) and indoor unit inlet dry bulb temperature (T _{DB, avg} ). Therefore, the performance curve of the water-cooled VRF heat pump system (CAPFT _heating ) should also be derived for the three temperature ranges.

The low temperature curve (Low Temperature Curve) is shown in Equation (6).

Heating capacity ratio (CAPFT _Heating) of FIG inflection point 5 (Boundary Curve) of the section of the low-temperature region where the cooling water to obtain a temperature lower standards (Low Temperature Curve) is [Equation 6] and the like, heated to obtain the temperature (T _h) And the indoor unit inlet dry bulb temperature (T _{DB, avg} ). In contrast to the cooling mode, both the hot water intake temperature (T _h ) and the indoor unit inlet dry bulb temperature (T _{DB, avg} ) must be considered in the low temperature section of the heating mode. In addition, the low-temperature range, according to the national S's water-cooled VRF TDB data used in the present invention (Low Temperature Curve) rated heating capacity ratio (CAPFT _Heating = 1.0) serving as a reference of the hot water to obtain temperature (T _h) 20 ℃, indoor dry bulb temperature (T _{DB, avg} ) at 27 ° C. It is possible to calculate the heating capacity ratio (CAPFT _Heating), which changes according to the hot water to obtain temperature (T _h) and the indoor unit inlet dry bulb temperature (T _{DB, avg)} as a reference, and the heating capacity ratio (CAPFT _Heating) for each temperature The coefficients a, b, c, d, and e of each coefficient can be derived by substituting in [Equation 6].

The inflection point (Boundary Curve) is shown in Equation (7).

In FIG. 5, the time point at which the heating ability pattern changes abruptly according to the change of the hot water intake temperature is represented by an inflection point (interval), which is defined as a cubic equation. As in the cooling mode, the inflection point is a boundary condition divided into a low temperature curve (High Temperature Curve) and a high temperature curve (High Temperature Curve), and a hot water supply for the indoor unit inflow dry bulb temperature (T _{DB, avg} ) Temperature (T _h ). Therefore _, the coefficients a, b, c, and d are derived by substituting the hot water intake temperature (T _h ) of the boundary condition that changes according to the indoor unit inlet dry bulb temperature (T _{DB, avg} ) into the equation (7).

The high temperature curve is expressed by Equation (8).

As shown in FIG. 5, the heating capacity ratio (CAPFT _Heating ) of the high temperature curve, which is a section where the hot water intake temperature is high on the basis of the inflection point _{, avg} ). This low-temperature section (Low Temperature Curve) and the high temperature section (High Temperature Curve) is, but the same definition as the formula 6, the high temperature section (High Temperature Curve) is not affected by hot water to obtain temperature (T _h) the indoor inflow The values of the coefficients d, e, and f are zero because they are determined solely by the dry bulb temperature (T _{DB, avg} ). Accordingly, the performance curve equation of the high temperature curve is defined as shown in Equation (8). Further, the heating capacity ratio (CAPFT _Heating ), which varies according to the indoor dry bulb temperature (T _{DB, avg} ) under the same rated condition as the low temperature curve described above _, is calculated, a, b, and c can be derived.

3.2 Heating Energy Input Curve: Temperature

6 shows the energy input ratio function of temperature (EIR _heating ) of the water-cooled VRF heat pump, which changes according to the hot water intake temperature in the heating mode and the dry bulb temperature of the indoor unit based on the TDB data of the domestic S company. EIRFT _Heating is the same as EIRFT _Cooling because it has no definite boundary curve. Therefore, even if it is calculated with only one performance curve for all hot water intake temperature (T _h ) There is no problem.

EIRFT _Heating is defined by a quadratic quadratic equation that varies according to the temperature of the hot water inlet temperature T _h and the temperature of the inlet air of the indoor unit T _{DB, avg} as shown in Equation (9). In order to derive the _heating power consumption (EIRFT _heating ), the power consumption (PI) in the rated condition should be selected. According to the domestic S's water-cooled VRF TDB data used in the present invention as in the cooling mode, the rated condition of the heating power (EIRFT _Heating) is heated to obtain the temperature (T _h) 20 ℃, the indoor inlet dry bulb temperature (T _{DB, avg)} Lt; RTI ID = 0.0 > 27 C. < / RTI & Thus _, it is possible to calculate the heating power consumption ratio that varies depending on the hot water intake temperature (T _h ) and the indoor unit inlet dry bulb temperature (T _{DB, avg} ) based on the rated power consumption (PI). B, c, d, e, and e are obtained by substituting the _heating power consumption ratio (EIRFT _Heating ) that varies depending on the hot water intake temperature (T _h ) and the indoor unit inlet dry bulb temperature (T _{DB, avg} ) f can be derived.

3.3 Heating Energy Input Curve: Part-Load Ratio Curve

For a water-cooled VRF heat pump system, the performance curve for heating power consumption is influenced by the partial load factor as well as the hot water inlet temperature and indoor unit inlet dry bulb temperature. In the case of the partial load ratio in the heating mode _, the heating load ratio to be removed from the indoor unit for the heating capacity varying according to the hot water intake temperature (T _h ) entering the heat pump and the dry bulb temperature (T _{DB, avg} ) It means. Accordingly, as shown in FIG. 7, the energy input ratio (EIRFPLR _Heating ) according to the partial load ratio is a ratio of the power consumption that varies with the partial load ratio change with respect to the power consumption PI under the rated condition . Since the TDB data of the S company used in the present invention has a partial load factor of 100% or less, the heating power consumption ratio (EIRFPLR _Heating ), which varies with the partial load ratio, is defined by the following equation (10).

In addition, as shown in [Table 2], the power consumption ratio according to each partial load ratio to the heating power consumption under the condition that the partial load ratio is 100% was calculated after confirming the heating capacity according to the partial load ratio through TDB data. B, c and d can be derived by substituting the _heating power consumption ratio (EIRFPLR _Heating ) which varies according to the partial load ratio after calculating the power consumption ratio into the equation (10).

Heating EIRFPLR Heating Power (kW) Normailzed EIRFPLR PLR PLR ² PLR ³ 1.89 0.436 0.5 0.25 0.125 2.46 0.568 0.569 0.36 0.212 3.02 0.697 0.7 0.484 0.337 3.63 0.838 0.796 0.634 0.504 4.07 0.94 0.896 0.803 0.72 4.33 One One One One

Each coefficient calculated from various performance curves has been input to the curve value corresponding to the water-cooled VRF model of the EnergyPlus, so that the cooling / heating ability and the energy consumption vary dynamically according to various conditions when the system is applied to the building It will be predictable quantitatively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. It is obvious that you can do it.

Claims (8)

A method for predicting a cooling / heating capacity for estimating a quantitative energy consumption in a water-cooled VRF heat pump system for cooling and heating a room by connecting a water-cooled VRF heat pump to a single or a plurality of heat source units and a plurality of indoor units by piping ,
The temperature of the coolant or the temperature of the hot water flowing into the heat pump and the temperature of the dry bulb or the wet bulb of the air flowing into the indoor unit,
The prediction formula of the cooling capability (CAPFT _cooling ) during the cooling /
5 or more different temperatures are extracted from the wet bulb temperature of the air flowing into the indoor unit, the temperature of the cooling water corresponding to the temperature is measured in the range of 10 to 45 ° C,
Determining an intake temperature of the cooling water whose cooling capacity ratio varies in the cooling capability ratio calculated based on the wet bulb temperature of the measured air and the intake temperature of the cooling water,
Wherein a temperature higher than the inflection point temperature is defined as a high temperature section and a temperature lower than the inflection point temperature is defined as a low temperature section by using the following equation for each section as an inflow point of the determined cooling water as an inflection point, A method for predicting the cooling / heating capacity of a heat pump system.
- High temperature section

- low temperature section

Where T _c is the cooling water intake temperature entering the water-cooled VRF heat pump, and T _{WB, avg} is the wet bulb temperature of the air entering the indoor unit. delete The method according to claim 1,
Wherein the predictive equation for the inflection point temperature is derived by the following equation: < EMI ID = 1.0 >

The method according to claim 1,
The prediction equation of the heating capacity in the cooling /
5 or more different temperatures are extracted from the dry bulb temperature of the air flowing into the indoor unit, the temperature of the hot water corresponding to the temperature is measured in the range of 10 to 45 ° C,
Determines an incoming water temperature of hot water whose heating capacity ratio changes in the heating capacity ratio calculated based on the dry bulb temperature of the measured air and the incoming water temperature of hot water,
Wherein a temperature higher than the inflection point temperature is defined as a high temperature section and a temperature lower than the inflection point temperature is defined as a low temperature section by using the following equation for each section as an inflow point of the determined hot water as an inflection point, A method for predicting the cooling / heating capacity of a heat pump system.
- High temperature section

- low temperature section

Where T _h is the hot water inlet temperature, and T _{DB, avg} is the inlet bulb temperature of the indoor unit. 5. The method of claim 4,
Wherein the predictive equation for the inflection point temperature is derived by the following equation: < EMI ID = 1.0 >

delete delete delete

Images