WO2019088314A1

WO2019088314A1 - Method for calculation of quantity of heat production and efficiency of heat pump system using geothermal heat

Info

Publication number: WO2019088314A1
Application number: PCT/KR2017/012260
Authority: WO
Inventors: 김종률; 이원근; 문기선; 조수진; 김승욱
Original assignee: 주식회사 티이
Priority date: 2017-11-01
Filing date: 2017-11-01
Publication date: 2019-05-09

Abstract

The present invention can calculate the quantity of heat production of a system using geothermal heat more rapidly and accurately by, during heating operation, calculating and adding up the quantities of heat production of a heat pump from the time when the discharge temperature of a first fluid discharged from the heat pump increases to be a predetermined temperature or higher after turning on the pump. Also, the present invention can calculate a more accurate quantity of heat production by considering even the quantity of heat production after turning off the heat pump, by stopping the addition of the quantities of heat production by considering a difference between the introduction temperature of the first fluid introduced into the heat pump and the discharge temperature of the first fluid discharged from the heat pump after turning off the heat pump.

Description

Calculation of heat production and efficiency of heat pump system using geothermal heat

More particularly, the present invention relates to a method of calculating a calorific value and efficiency of a heat pump system using geothermal heat that can more accurately calculate a calorific value and efficiency of a heat pump system using geothermal heat. .

Generally, a heat pump is an air heat source system that obtains or discharges heat in the atmosphere, a hydrothermal source system that discharges heat through a cooling tower, and a geothermal system that obtains heat from the ground or discharges heat to the ground.

Since the ground temperature can be maintained almost constant when the depth of the ground is above a certain depth, the geothermal circulation system has an advantage of energy efficiency higher than the air heat source system. In the case of summer cooling, a large amount of electric power is consumed in order to discharge the cooling heat because the air temperature is very high at 30 ° C or more in the air. However, in the geothermal circulation system, the temperature of the ground is 10 to 20 ° C It is much lower than the temperature, so it is easy to discharge the cooling heat, so the efficiency is high. In case of winter heating, it is difficult to supply the heat required for heating because the air temperature is very low in the air. However, since the temperature of the ground is 10 to 20 ℃ higher than the atmospheric temperature, Can be supplied to the heat pump.

On the other hand, in the case of a heat pump using geothermal heat, it is necessary to more accurately measure the geothermal energy used for cooling and heating in order to use geothermal heat more efficiently.

It is an object of the present invention to provide a method of calculating the heat quantity and efficiency of a heat pump system using geothermal heat that can more accurately calculate the calorific value and the efficiency of production.

A method of calculating a heat quantity and efficiency of a heat pump system using geothermal heat according to the present invention includes a heat pump provided with a heat source from an underground heat exchanger and providing a heat source as a heat demand source, 1. A heat pump system using geothermal heat comprising a pump for pumping a first fluid, the method comprising: turning on the heat pump after a first set time after turning on the pump; When the discharge temperature of the first fluid discharged from the heat pump becomes equal to or greater than a first preset temperature which is higher than an initial discharge temperature of the first fluid after the pump is turned on, Measuring an inlet temperature, a discharge temperature of the first fluid, and a flow rate of the first fluid to calculate a production heat quantity of the heat pump in real time and start integration; And stopping the accumulation of the heat produced by the heat pump when the difference between the inflow temperature of the first fluid and the discharge temperature of the first fluid after the heat pump is turned off is less than a preset second set temperature.

According to the present invention, the heat generated by the heat pump is accumulated and accumulated until a predetermined time after the heat pump is turned off from a predetermined time before the heat pump is turned on after the pump is turned on. The calorie production of the system can be calculated.

Further, the present invention calculates and accumulates the heat produced by the heat pump from the time when the discharge temperature of the first fluid discharged from the heat pump is lowered to a predetermined temperature or lower after the pump is turned on during the cooling operation, It is possible to calculate the calorific value of a system using geothermal energy accurately.

Further, in the heating operation, in the heating operation, the heat produced by the heat pump is calculated and integrated from the time when the discharge temperature of the first fluid discharged from the heat pump rises above the predetermined temperature after the pump is turned on, But it is possible to calculate the calorific value of the system using geothermal energy accurately.

Further, according to the present invention, by stopping the accumulation of the calorific value in consideration of the difference between the inflow temperature of the first fluid flowing into the heat pump and the discharge temperature of the first fluid discharged from the heat pump after turning off the heat pump, It is possible to calculate a more accurate calorific value by taking into account the calorific value after turning off the heat pump.

In the present invention, by bypassing a part of the first fluid by the heat pump according to the temperature of the first fluid flowing into the heat pump, the calorific value of the produced fluid can be measured while the inflow temperature of the first fluid is kept constant, There is an advantage that the calorific value can be calculated more accurately and more quickly.

FIG. 1 is a schematic configuration diagram of a heat pump system using geothermal heat according to a first embodiment of the present invention.

FIG. 2 is a graph illustrating a temperature change of a first fluid according to time during a cooling operation of a heat pump system using geothermal heat according to the first embodiment of the present invention. FIG.

FIG. 3 is a graph showing a change in the calorific value with time during the cooling operation of the heat pump system using the geothermal heat according to the first embodiment of the present invention.

FIG. 4 is a graph showing the temperature change of the first fluid according to the heating operation time of the heat pump system using the geothermal heat according to the first embodiment of the present invention.

FIG. 5 is a graph showing a change in the calorific value of the heat pump system using the geothermal heat according to the first embodiment of the present invention with time during the heating operation.

6 is a schematic configuration diagram of a heat pump system using geothermal heat according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, the heat pump system using geothermal heat according to the first embodiment of the present invention includes a heat pump 20 provided with a heat source from an underground heat exchanger 10 and providing a heat source to a heat demander 40, And a pump 30 for pumping the first fluid circulating the heat pump 20 and the heat consumer 40.

The underground heat exchanger (10) is a heat exchange buried in the ground. The underground heat exchanger (10) and the heat pump (20) are connected to a second flow path (11) through which the second fluid circulates. Hereinafter, in the present embodiment, the second fluid is brine for example.

A second flow meter (12) for measuring the flow rate of the brine may be installed in the second flow path (11).

The heat pump 20 receives a heat source from the underground heat exchanger 10 and provides a heat source to the heat demander 40.

The heat pump 20 is composed of a compressor (not shown), an indoor heat exchanger (not shown), an outdoor heat exchanger (not shown) and an expansion device (not shown) , The outdoor heat exchanger, and the expansion device. And the third fluid is a refrigerant different from the first fluid.

One side of the heat pump (20) and the underground heat exchanger (10) are connected to the second flow path (11). One side of the heat pump 20 corresponds to the outdoor heat exchanger (not shown).

The other side of the heat pump 20 and the heat consumer 40 are connected to the

first flow paths

21 and 22. Here, the other side of the heat pump 20 corresponds to the indoor heat exchanger (not shown).

The

first flow paths

21 and 22 include an inlet flow path 21 formed to flow the first fluid from the heat consumer 40 to the heat pump 20, And a discharge passage 22 formed to discharge the first fluid.

The inflow channel 21 is provided with a first flow meter 23 for measuring the flow rate of the first fluid flowing into the heat pump 20. The inflow channel 21 is provided with an inflow temperature sensor 51 for measuring the temperature of the first fluid flowing into the heat pump 20.

The pump (30) for pumping the first fluid discharged from the heat pump (20) is installed in the discharge passage (22). The discharge passage 22 is provided with a discharge temperature sensor 52 for measuring the temperature of the first fluid discharged from the heat pump 20.

The operation of the heat pump system using the geothermal heat pump according to the present invention will now be described.

First, the cooling operation of the heat pump 20 will be described.

When the cooling operation mode is selected by the user's operation, the control unit (not shown) turns on the pump 30.

After the pump 30 is turned on, the heat pump 20 is turned on after a predetermined first set time Tl. That is, the control unit does not turn on the pump 30 and the heat pump 20 at the same time.

During the cooling operation of the heat pump 20, the indoor heat exchanger (not shown) functions as an evaporator, and the outdoor heat exchanger (not shown) functions as a condenser.

The first fluid introduced into the heat pump 20 through the inflow channel 21 is cooled through heat exchange in the heat pump 20 and then flows through the discharge channel 22 to the heat consumer 40. [ . Accordingly, it is possible to provide cool air to the heat consumer 40. [

The brine flowing into the heat pump 20 through the second flow path 11 is heated by heat exchange in the heat pump 20 and then discharged to the underground heat exchanger 10.

In the underground heat exchanger (10), the brine releases heat to the ground.

Thereafter, when the stop of the cooling operation mode is selected by the user's operation, the control unit turns off the heat pump 20.

The pump 20 is turned off after a predetermined second set time? T2 after the heat pump 20 is turned off. That is, the control unit does not turn off the heat pump 20 and the pump 30 at the same time. Since the first fluid remains on the inflow passage 21 and the discharge passage 22 even after the heat pump 20 is turned off, the second set time? T2 is set so as to extract the remaining first fluid, The pump 30 must be operated further. If the first fluid remains on the inlet flow path 21 and the discharge flow path 22, the first fluid may be frozen in the future, and the flow path or the heat pump 20 may be damaged.

Referring to FIG. 2, there is a time difference between the time T1 when the pump 30 is turned on and the time T2 when the heat pump 20 is turned on by the first set time? T1. The first set time? T1 is 2 to 3 minutes, for example.

The inflow temperature t _in of the first fluid flowing into the heat pump 20 is substantially constant during the first set time Tl after the pump 30 is turned on, The discharge temperature t _out of the first fluid decreases gradually.

In FIG. 2, t ₀ represents the initial discharge temperature of the first fluid discharged from the heat pump 20.

Thereafter, the discharge temperature t _out of the first fluid discharged from the heat pump 20 is decreased to a predetermined temperature from a time T2 when the heat pump 20 is turned on to a time T3 when the heat pump 20 is turned off, Keep the temperature.

The time T3 at which the heat pump 20 is turned off and the time T4 at which the pump 30 is turned off have a time difference by the second set time? T2. The second set time? T2 is, for example, 2 to 3 minutes. The first and second set times may be preset by experiment or the like.

The discharge temperature t _out of the first fluid discharged from the heat pump 20 increases gradually during the second set time T 2 after the heat pump 20 is turned off, (t _in ), and the inflow temperature (t _in ) of the first fluid is kept substantially constant.

Referring to FIG. 3, it can be seen that the heat produced Q of the heat pump 20 gradually increases but is lower than zero during the first set time Tl after the pump 30 is turned on. That is, since the heat pump 20 is not driven during the first set time Tl, the calorific value Q is a negative value. 3, Q ₀ represents the amount of heat at the time when the pump 30 is turned on, and Q ₁ represents the amount of heat at the time when the heat pump 20 is turned on.

When the heat pump 20 is driven by the lapse of the first set time Tl, the first fluid is heat-exchanged in the heat pump 20 to be cooled, so that the discharge temperature t _out of the first fluid is lowered . Therefore, it can be seen that the calorific value Q rises above a certain value.

During the second set time T2 after the heat pump 20 is turned off, the heat produced Q of the heat pump 20 gradually decreases and then maintains a constant value. Since the heat pump 20 is not driven but the pump 30 is driven during the second set time T2, the calorific value Q decreases gradually.

When the second set time? T2 elapses and the pump 30 is turned off, the calorific value Q becomes zero.

Meanwhile, a method of calculating the calorific value of the heat pump 20 during the cooling operation of the heat pump 20 is as follows.

During the cooling operation, the measurement time? Treal of the calorific value Qreal is set from the fifth time point T5 to the sixth time point T6.

The fifth point of time T5 is a point at which the discharge temperature t _out of the first fluid discharged from the heat pump 20 after the pump 30 is turned on is lower than the initial discharge temperature t ₀ of the first fluid. Is equal to or greater than a predetermined first set temperature? T ₁ .

Here, the discharge temperature t _out of the first fluid is a temperature measured in real time by the discharge temperature sensor 52. The initial discharge temperature t ₀ of the first fluid is an initial discharge temperature initially measured by the discharge temperature sensor 52 after the pump 30 is turned on.

During the cooling operation, the fifth time point (T5) represents a time point at which the discharge temperature ( _tout ) of the first fluid discharged from the heat pump (20) drops below a predetermined temperature. The fifth time point T5 is also a time point at which the amount of heat produced starts to gradually increase.

Even before turning on the heat pump unit 20 gradually decreases the first (t _out), the discharge temperature of the first fluid, and the production amount of heat is also specified that since the increase in amount, but the first (t _out), the discharge temperature of the first fluid (T5), which is a time point at which the temperature of the exhaust gas is lowered to a temperature lower than the temperature of the exhaust gas.

The sixth point of time T6 is a point at which the difference between the inflow temperature t _in of the first fluid discharged from the heat pump 20 and the discharge temperature t _out after the heat pump 20 is turned off Is less than the set second set temperature? T ₂ . Here, the second set temperature? T ₂ is about 5 degrees, for example, will be described.

During the cooling operation, the sixth time point T6 indicates a time point at which the discharge temperature t _out of the first fluid discharged from the heat pump 20 becomes higher than a predetermined temperature. Also, the sixth time point T6 is a time point at which the amount of heat produced is rapidly reduced and then gradually decreases.

Since the discharge temperature t _out of the first fluid decreases gradually after the heat pump 20 is turned off and the produced heat amount Q also decreases but has a predetermined value or more, The production heat quantity Q is recognized until the difference between the temperature t _in and the discharge temperature t _out is the second set temperature t ₂ .

That is, if the difference between the inflow temperature t _in of the first fluid and the discharge temperature t _out is less than the preset second set temperature? T ₂ , the accumulation of the calorific heat is stopped.

On the other hand, if the difference between the inflow temperature t _in of the first fluid and the discharge temperature t _out is less than the second set temperature? T ₂ , it is determined that the calorific value Q is very small and can be ignored.

Accordingly, in the present invention, the calorific value is measured and integrated from the fifth time point T5, and the accumulation of the calorific value is stopped at the sixth time point T6.

The formula for obtaining the calorific value Qreal during the measurement time? Treal is shown in Equation (1). In the equation (1), m is the flow rate measured by the first flow meter 23, and? T represents the difference between the inflow temperature t _in of the first fluid and the discharge temperature t _out .

&Quot; (1) "

Qreal = m * Cp *? T

The amount of heat produced by the underground heat exchanger 10 can also be known by calculating the calorific value Qreal.

As described above, in the present embodiment, regardless of the operation time of the pump 30, the calorific value Qreal is calculated for the measurement time DELTA Treal from the fifth time point T5 to the sixth time point T6 Since the measurement is integrated, it is possible to measure the calorific value more accurately.

Some consider the first set period of time (ΔT1) and the second set because all of the time (ΔT2) considered hagieneun a very small impact on the production of heat in accordance with the actual heat exchanger, the discharge temperature of the first fluid (t _out) section Can only be recognized. Therefore, it is possible to measure the calorific value of production more quickly and accurately.

The method of obtaining the efficiency (?) Of the heat pump system is as follows.

The consumed power P is calculated from the time T1 when the pump 30 is turned on to the time T4 when the pump 30 is turned off. The power (P) includes power consumed in driving the pump (30) and the heat pump (20).

The efficiency (?) Of the heat pump system can be determined by dividing the heat quantity Qreal calculated above by the power (P).

Equation (2) represents the efficiency (?) Of the heat pump system.

&Quot; (2) "

? = (Qreal) / P

On the other hand, the heating operation of the heat pump 30 will be described.

When the heating operation mode is selected by the user's operation, the control unit (not shown) turns on the pump 30.

In the heating operation of the heat pump 20, the indoor heat exchanger (not shown) serves as a condenser, and the outdoor heat exchanger (not shown) serves as an evaporator.

The first fluid introduced into the heat pump 20 through the inflow channel 21 is heated through heat exchange in the heat pump 20 and then flows through the discharge channel 22 to the heat consumer 40. [ . Therefore, heat can be provided to the heat consumer 40.

The brine flowing into the heat pump 20 through the second flow path 11 is cooled by heat exchange in the heat pump 20 and then discharged to the underground heat exchanger 10.

In the underground heat exchanger (10), the brine absorbs heat from the ground.

Thereafter, when the stop of the heating operation mode is selected by the user's operation, the control unit turns off the heat pump 20.

The pump 20 is turned off after a predetermined second set time? T2 after the heat pump 20 is turned off. That is, the control unit does not turn off the heat pump 20 and the pump 30 at the same time. Since the first fluid remains on the inflow passage 21 and the discharge passage 22 even after the heat pump 20 is turned off, the second set time? T2 is set so as to extract the remaining first fluid, The pump 30 must be operated further.

Referring to FIG. 4, there is a time difference between the time T1 when the pump 30 is turned on and the time T2 when the heat pump 20 is turned on by the first set time? T1. The first set time? T1 is 2 to 3 minutes, for example.

The inflow temperature t _in of the first fluid flowing into the heat pump 20 is substantially constant during the first set time Tl after the pump 30 is turned on, The discharge temperature t _out of the first fluid gradually increases.

Thereafter, the discharge temperature t _out of the first fluid discharged from the heat pump 20 from the time point T2 when the heat pump 20 is turned on to the time point T3 when the heat pump 20 is turned off is increased to a predetermined temperature, Keep the temperature.

The discharge temperature t _out of the first fluid discharged from the heat pump 20 decreases gradually during the second set time T 2 after the heat pump 20 is turned off, (t _in ), and the inflow temperature (t _in ) of the first fluid is kept substantially constant.

Referring to FIG. 5, it can be seen that the heat produced Q of the heat pump 20 gradually increases but is lower than 0 during the first set time Tl after the pump 30 is turned on. That is, since the heat pump 20 is not driven during the first set time Tl, the calorific value Q is a negative value.

When the heat pump 20 is driven with the lapse of the first set time Tl, the first fluid is heat-exchanged in the heat pump 20 so that the discharge temperature t _out of the first fluid gradually increases . Therefore, it can be seen that the calorific value Q is increased above a predetermined value.

Therefore, a method of calculating the heat produced by the heat pump 20 during the heating operation of the heat pump 20 is as follows.

The measurement time DELTA Treal of the calorific value Qreal is set from the fifth time point T5 to the sixth time point T6 as in the cooling operation mode.

The fifth point of time T5 is a point at which the discharge temperature t _out of the first fluid discharged from the heat pump 20 after the pump 30 is turned on is lower than the initial discharge temperature t ₀ of the first fluid. and than the first predetermined temperature (Δt ₁₎ it differs by more than a preset time point I, and the third time (T3) is a time for turning off the heat pump (20).

The fifth time point T5 represents a time point at which the discharge temperature t _out of the first fluid discharged from the heat pump 20 becomes higher than a predetermined temperature. The fifth time point T5 is also a time point at which the amount of heat produced starts to gradually increase.

Even before turning on the heat pump 20 it becomes higher gradually is the first (t _out), the discharge temperature of the first fluid, the production of heat due to increase in amount, but, in the said first (t _out), the discharge temperature of the first fluid desired From the fifth time point (T5), which is a time point at which the temperature of the fuel cell becomes higher than the predetermined temperature.

The sixth point of time T6 is a point at which the difference between the inflow temperature t _in of the first fluid discharged from the heat pump 20 and the discharge temperature t _out after the heat pump 20 is turned off Is less than the set second set temperature? T ₂ .

The sixth time point T6 during the heating operation indicates a time point at which the discharge temperature t _out of the first fluid discharged from the heat pump 20 becomes lower than a predetermined temperature. Also, the sixth time point T6 is a time point at which the amount of heat produced is rapidly reduced and then gradually decreases.

Since the discharge temperature t _out of the first fluid decreases gradually after the heat pump 20 is turned off and the produced heat amount Q also decreases but has a predetermined value or more, The production heat quantity Q is recognized until the difference between the temperature t _in and the discharge temperature t _out is the second set temperature t ₂ . Here, the second set temperature? T ₂ is about 5 degrees, for example, will be described.

On the other hand, if the difference between the inflow temperature t _in of the first fluid and the discharge temperature t _out is less than the second preset temperature t ₂ , it is determined that the calorific value Q is very small and can be ignored.

Accordingly, in the present invention, the calorific value of the produced product Q is measured more accurately by starting the accumulation of the calorific value from the fifth time point T5 and stopping the accumulation of the calorific value at the sixth time point T6 can do.

The formula for obtaining the calorific value Qreal during the measurement time? Treal is shown in Equation (1). In the heating operation in Equation (1),? T is a value obtained by subtracting the inflowing temperature (t _in ) from the discharge temperature (t _out ) of the first fluid.

As described above, in the present embodiment, since the production heat quantity Qreal is measured and integrated during the measurement time? Treal from the fifth time point T5 to the sixth time point T6, It is possible to measure the calorific value more accurately.

In order to consider both the first set time Tl and the second set time T2 in addition to the measurement time? Treal, the influence of the heat generated by the heat exchange on the heat generated is very small, It is possible to recognize the heat of production for only a certain section in consideration of the discharge temperature (t _out ). Therefore, it is possible to measure the calorific value of production more quickly and accurately.

The method for obtaining the efficiency? Of the heat pump system during the heating operation is the same as that during the cooling operation.

That is, the consumed power P is calculated from the time T1 when the pump 30 is turned on to the time T4 when the pump 30 is turned off. The power (P) includes power consumed in driving the pump (30) and the heat pump (20).

Referring to Equation (2), the efficiency (?) Of the heat pump system can be known by dividing the heat quantity Qreal calculated above by the power (P).

Referring to FIG. 6, a heat pump system using geothermal heat according to a second embodiment of the present invention includes a heat pump 20 for supplying a part of the first fluid before being introduced into the heat pump 20 to the discharge side of the heat pump 20 The bypass passage 60 for passing the air, and the three-way valve 61 are different from those of the first embodiment, and the rest of the configuration and operation are similar to each other, so that different configurations will be described in detail.

The bypass passage 60 is branched from the inflow passage 21 and connected to the discharge passage 22.

The three-way valve (61) is installed at a point where the bypass flow path (60) branches from the inflow path (21).

During the cooling operation, the control unit (not shown) compares the inflow temperature of the first fluid before entering the heat pump 20 with a predetermined minimum set temperature.

Way valve (61) opens the bypass flow path (60) when the inflow temperature of the first fluid is less than the minimum set temperature. And a part of the first fluid flows into the bypass flow path (60).

The first fluid flowing into the bypass passage 60 is not cooled by the heat pump 20 so that the temperature of the first fluid on the discharge passage 22 is increased.

When the temperature of the first fluid in the discharge passage 22 is increased, the temperature of the first fluid supplied to the heat consumer 40 through the discharge passage 22 and then flowing into the inflow passage 21 becomes .

Therefore, when the temperature of the first fluid flowing into the inflow channel 21 rises above the minimum set temperature, the control unit blocks the bypass flow channel 60 again.

The temperature of the first fluid before entering the heat pump 20 can be maintained at the lowest set temperature or higher, so that the heat exchange efficiency of the indoor heat exchanger of the heat pump 20 can be improved. That is, if the temperature of the first fluid before entering the heat pump 20 is lower than the lowest set temperature, the heat exchange efficiency of the indoor heat exchanger of the heat pump 20 is lowered.

Therefore, after the temperature of the first fluid before being introduced into the heat pump 20 is maintained at the minimum set temperature or more, the method of the first embodiment or the second embodiment, And efficiency can be obtained.

On the other hand, in the heating operation, the control unit (not shown) compares the inflow temperature of the first fluid before entering the heat pump 20 with a preset maximum set temperature.

And controls the three-way valve (61) to open the bypass flow path (60) when the inflow temperature of the first fluid exceeds the maximum set temperature. Accordingly, a part of the first fluid flows into the bypass flow path (60).

The first fluid flowing into the bypass passage 60 is not heated by the heat pump 20 and the temperature of the first fluid on the discharge passage 22 is lowered.

When the temperature of the first fluid in the discharge passage 22 is lowered, the temperature of the first fluid supplied to the heat consumer 40 through the discharge passage 22 and then flowing into the inflow passage 21 .

Therefore, when the temperature of the first fluid flowing into the inflow channel 21 is lowered to the maximum set temperature or less, the control unit again shields the bypass flow channel 60.

Since the temperature of the first fluid before entering the heat pump 20 can be kept below the maximum set temperature, the heat exchange efficiency of the indoor heat exchanger of the heat pump 20 can be improved. That is, when the temperature of the first fluid before entering the heat pump 20 is higher than the highest set temperature, the heat exchange efficiency of the indoor heat exchanger of the heat pump 20 is lowered.

Therefore, after the temperature of the first fluid before being introduced into the heat pump 20 is kept constant below the maximum set temperature, the amount of heat produced by the method according to the first embodiment or the second embodiment And efficiency can be obtained.

It is possible to measure the calorific value of production while keeping the inflow temperature of the first fluid at a constant value, so that it is possible to calculate the calorific value more quickly and accurately.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

According to the present invention, it is possible to manufacture a heat pump system that utilizes geothermal heat that can more accurately calculate the calories produced.

Claims

1. A heat pump system using geothermal heat, comprising a heat pump provided with a heat source from an underground heat exchanger and providing a heat source to a heat consumer, and a pump for pumping the heat pump and a first fluid circulating through the heat consumer,

Turning on the heat pump after a first predetermined time after turning on the pump;

When the discharge temperature of the first fluid discharged from the heat pump becomes equal to or greater than a first preset temperature which is higher than an initial discharge temperature of the first fluid after the pump is turned on, Measuring an inlet temperature, a discharge temperature of the first fluid, and a flow rate of the first fluid to calculate a production heat quantity of the heat pump in real time and start integration;

And stopping the accumulation of the heat produced by the heat pump when the difference between the inflow temperature of the first fluid and the discharge temperature of the first fluid after the heat pump is turned off is less than a preset second set temperature, A method of calculating a heat capacity and efficiency of a heat pump system used.
The method according to claim 1,

Further comprising turning off the pump after a second set time period after turning off the heat pump. &Lt; RTI ID = 0.0 > < / RTI >
The method of claim 2,

Calculating power consumed to operate the pump and the heat pump until the pump is turned off from the time when the pump is turned on;

Calculating the efficiency of the heat pump system using the calculated heat capacity of the heat pump and the calculated power. &Lt; RTI ID = 0.0 > 31. < / RTI >
The method according to claim 1,

Wherein the first set time is set according to the inflow temperature of the first fluid.
The method of claim 4,

The first set time period

Wherein a time period from when the pump is turned on to when the inflow temperature of the first fluid is equal to or higher than a predetermined set minimum temperature during cooling operation is calculated.
The method according to claim 1,

When the inflow temperature of the first fluid during the cooling operation is less than a predetermined minimum set temperature,

And a portion of the first fluid before being introduced into the heat pump is bypassed to the discharge side of the heat pump.
The method according to claim 1,

When the inflow temperature of the first fluid exceeds a predetermined maximum set temperature at the time of heating operation,

And a portion of the first fluid before being introduced into the heat pump is bypassed to the discharge side of the heat pump.
1. A heat pump system using geothermal heat, comprising a heat pump provided with a heat source from an underground heat exchanger and providing a heat source to a heat consumer, and a pump for pumping the heat pump and a first fluid circulating through the heat consumer,

Turning on the heat pump after a first predetermined time after turning on the pump;

When the discharge temperature of the first fluid discharged from the heat pump becomes equal to or greater than a first preset temperature which is higher than an initial discharge temperature of the first fluid after the pump is turned on, Measuring an inlet temperature, a discharge temperature of the first fluid, and a flow rate of the first fluid to calculate a production heat quantity of the heat pump in real time and start integration;

Stopping the accumulation of the heat produced by the heat pump when the difference between the inflow temperature of the first fluid and the discharge temperature of the first fluid after the heat pump is turned off is less than a preset second set temperature;

And turning off the pump after a second set time after turning off the heat pump,

Bypassing a part of the first fluid before being introduced into the heat pump to the discharge side of the heat pump when the inflow temperature of the first fluid during the cooling operation is less than a predetermined set minimum temperature,

A heat pump system using geothermal heat to bypass a part of the first fluid before being introduced into the heat pump to the discharge side of the heat pump when the inflow temperature of the first fluid exceeds a preset maximum set temperature at the time of heating operation How to calculate the production calorie and efficiency.