KR20100035314A - Heat pump system - Google Patents

Abstract

PURPOSE: A heat pump system is provided to perform hot water supply simultaneously during heating or separately and to improve the performance by controlling the compression rate of a compressor. CONSTITUTION: A heat pump system comprises a basic cooling cycle(10), a hot water heating circuit(20), and a re-condensing unit(30). In the basic dry-compression cooling cycle, a compressor(11), a four-way valve(12), an interior heat exchanger(13), an expansion valve(14) for cooling, an expansion valve(15) for heating, an exterior heat exchanger(16), and the four-way valve are sequentially connected through a refrigerant pipe(17), and the four-way valve and the compressor are connected through a refrigerant intake pipe(18). A bypass pipe(21) is connected between the compressor and the four-way valve. A condenser(22) is installed in the bypass pipe and a heat-absorbing heat exchanger(23) is installed in the condenser. A heat exchanger(24) is connected to the heat-absorbing heat exchanger. A second refrigerant pipe(31) is connected to the condenser outlet of the bypass pipe and the heating expansion valve inlet of the refrigerant pipe. A second condenser(32) is installed in the second refrigerant pipe, and a check valve(33) opened toward the heating expansion valve is installed in the outlet side of the second condenser.

Description

Heat Pump System {HEAT PUMP SYSTEM}

The present invention relates to a heat pump system, and more particularly, to a multifunction and heat modulus increasing structure of a heat pump system incorporating hot water heating means.

 As is well known, the heat pump system is provided with a 4-way valve in a refrigeration cycle, for example, when the air conditioner is used as an indoor heat exchanger for cooling and an evaporator for heating and condenser for heating and cooling the room. In order to obtain hot water for bathing or hot water supply (hereinafter, referred to as "hot water for hot water supply") necessary for a person to live daily life when the heat pump system is installed in a place where a person lives, a separate hot water heating means For example, a gas water heater is installed.

The present inventor proposes a heat pump type air-cooling and heating device which solves the installation and operation costs according to the separate installation of the above-mentioned hot water heating means and the securing point of the installation area.

The heat pump type air conditioner is a compressor, a four-way valve, an indoor heat exchanger, a cooling pressure reducing mechanism, a heating pressure reducing mechanism, an outdoor heat exchanger and the four-way valve in order to the refrigerant conduit, the four-way valve and A second heat exchanger (condenser) is installed in the bypass conduit by connecting a compressor to the refrigerant inlet conduit and connecting a bypass conduit between the compressor of the refrigerant conduit and the four-way valve. The heat exchanger is provided with a hot water heating circuit installed at one side, and by installing a storage tank not shown on the second heat exchanger side, the hot water heated in the hot water heating circuit is stored in the water storage tank when the room is cooled and heated. Radiant heating, etc. or hot water for hot water.

Although the heat pump type cooling / heating device has the advantage of simultaneously generating hot water during cooling and heating, there is a growing need to generate only hot water separately from the cooling and heating mode, but only the hot water mode is not possible, and also the heating mode. When the load decreases, the condensation of the refrigerant vapor in the indoor heat exchanger is incomplete, resulting in a problem such that high pressure is formed in the compressor and the grade coefficient is lowered.

And when the heat pump system is formed into an atmospheric heat source type, if the outside air temperature drops below the dew point in the heating mode, defrost means must be installed in the outdoor heat exchanger (evaporator). Is operated in reverse cycle to defrost the outdoor heat exchanger as a condenser, or to install an auxiliary heater in the indoor heat exchanger to use the heater as an auxiliary heat source when defrosting the outdoor heat exchanger. The reduction time, that is, the equalization time of the refrigerant pressure after defrosting is long, and since the auxiliary heater must be continuously used during the defrosting, the power consumption is not economical and the heating is difficult due to lack of calories.

On the other hand, a heat pump hot water supply machine which solves the problem of lowering the coefficient of performance is disclosed in Patent Document 2. The heat pump hot water supply machine includes a refrigeration cycle in which a compressor, a gas cooler, a pressure reducing device, and an evaporator are sequentially connected. And a heat pump water heater for supplying hot water by heating water in the gas cooler, the refrigerant pump having a refrigerant heat exchanger for lowering a refrigerant temperature at an outlet side of the gas cooler, wherein the refrigerant heat exchanger is disposed between the gas cooler and the pressure reducing device. By installing the on-off valve in parallel with the on-off valve, when the temperature of the water supplied to the gas cooler is more than the set value closes the on-off valve, the refrigerant discharged from the gas cooler flows into the refrigerant heat exchanger to lower the temperature of the refrigerant, In addition, the heat pump water heater defrosts the compressor to form an internal medium pressure two-stage compression type The defrost circuit introduces a medium pressure refrigerant compressed by the compressor into the evaporator, and includes a defrost solenoid valve and a bypass conduit to open the defrost solenoid valve during defrost operation and to provide a decompression device. It is completely open and the refrigerant compressed by the compressor is supplied to the evaporator to defrost the evaporator.

Patent Document 1; Patent No. 357988 (KR, B1)

Patent Document 2; 2003-194433 (JP, A)

However, the heat pump water heater has a simple function by only hot water operation, and has a complicated structure by separately providing a defrost circuit, and the defrost circuit is also a reverse cycle defrost method. .

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a heat pump system in which a hot water mode is formed in the heat pump type cooling and heating device of the present invention to further diversify functions and increase a coefficient of performance. do.

In order to achieve the above object, the present invention is to connect the compressor, the four-way valve, the indoor heat exchanger, the cooling expansion valve, the heating expansion valve, the outdoor heat exchanger and the four-way valve in order to the refrigerant conduit, A basic refrigeration cycle connecting the valve and the compressor with a refrigerant suction conduit; By-pass conduit is connected between the compressor and the 4-way valve of the refrigerant conduit to install a condenser in the bypass conduit, an endothermic heat exchanger in the condenser, and a hot water heating circuit connected to a heat exchanger in the endothermic heat exchanger. Wow; Connect a second refrigerant conduit to the condenser outlet side of the bypass conduit and the expansion valve inlet side of the refrigerant conduit to install a second condenser to maintain a heat transfer relationship with the outdoor heat exchanger in the second refrigerant conduit; It comprises a recondensing means provided with a check valve that opens to the heating expansion valve side on the outlet side of the condenser.

As described above, the present invention can generate hot water at the same time as the heating and cooling of the heat pump, or can generate only the hot water alone, thereby improving the convenience and improving the convenience of the defrosting circuit. Since the defrost mode can be performed together with the hot water or the hot water and heating mixed mode, hot water is convenient and comfortable heating is possible because there is no change in the heating temperature.

In addition, by adjusting the compression ratio of the compressor satisfactorily, not only the coefficient of performance can be increased but also the reliability of the compressor can be improved.

1 is a block diagram of an embodiment of the present invention, which is roughly divided into a basic refrigeration cycle 10, a hot water heating circuit 20, and a recondensing means 30.

The basic refrigeration cycle (10) is a compressor (11), four-way valve (12), indoor heat exchanger (13), cooling expansion valve (14), heating expansion valve (15), outdoor heat exchanger (16) and the The four-way valve 12 is connected in order to the refrigerant conduit 17 and the four-way valve 12 and the compressor 11 are connected to the refrigerant suction conduit 18. In the cooling operation, the four-way valve 12 is operated to flow in the arrow virtual line, and in the heating or cooling mode as described above, the fluid that is heat-exchanged with the indoor heat exchanger 13 is that air or water is used. The basic refrigeration cycle 10 is well known in heat pump systems.

The hot water heating circuit 20 connects a bypass conduit 21 between the compressor 11 of the refrigerant conduit 17 and the four-way valve 12 to connect the condenser 22 to the bypass conduit 21. And an endothermic heat exchanger (23) installed at the condenser (22), and a utilization side heat exchanger (24) connected to the endothermic heat exchanger (23) with a circulation pump (26) and a circulation conduit (25). By installing the solenoid valves (27a, 27b) between the connection of the bypass conduit 21 of the refrigerant conduit 17 and the inlet of the bypass conduit 21, a programmable controller (not shown) The signal of each mode switch of the PLC) is input to the control unit to open and close according to the set program.

The recondensing means 30 connects the second refrigerant conduit 31 to the outlet side of the condenser 22 of the bypass conduit 21 and the inlet side of the expansion valve 15 for heating of the refrigerant conduit 17. A second condenser 32 is installed in the second refrigerant conduit 31 so as to maintain a heat transfer relationship with the outdoor heat exchanger 16, and is opened to the expansion valve 15 for heating on the outlet side of the second condenser 32. Installs a check valve 33 and installs solenoid valves 34a and 34b in a position adjacent to the second refrigerant conduit 31 connection portion of the bypass conduit 21 and the second refrigerant conduit 31. Open and close according to the set program.

The outdoor heat exchanger (16) and the second condenser (32) are formed in a fin tube (fin & tube) type, the heat transfer tube of the second condenser 32 is disposed between the heat transfer tubes of the outdoor heat exchanger (16) heat transfer. The efficiency is improved, and the defrosting efficiency described later is improved.

A third condenser 38 is installed in the third refrigerant conduit 37 by connecting a third refrigerant conduit 37 bypassing the second condenser 32 to the second refrigerant conduit 31. The solenoid valves 39a and 39b are installed at the inlet side of the second condenser 32 of the second refrigerant conduit 31 and the inlet of the third refrigerant conduit 37 to provide a refrigerant in the second condenser 32. When the liquid is recondensed, the output value of the pressure sensor 40 installed at the inlet side of the second refrigerant conduit 31 is input to the controller, and the pressure is set in the mode except for a program set, for example, a hot water and cooling mixed mode described later. If the output value of the sensor 40 is less than or equal to the set value (eg, 23 kgf / cm 2), only the solenoid valve 39a is opened. If the output value is greater than or equal to the set value, the solenoid valve 39b is also opened. You can keep it and increase your grade factor even more.

In addition, a connection pipe 42 for bypassing the outdoor heat exchanger 16 is connected to the inlet side of the heating expansion valve 15 of the refrigerant conduit 17 and the inlet side of the second refrigerant conduit 31, Solenoid valves 43a and 43b are installed at the rear of the connecting pipe 42 in the refrigerant conduit 17 and the inlet of the connecting pipe 42, so that the outlet of the indoor heat exchanger 13 of the refrigerant conduit 17 is installed. When the output value of the pressure sensor 44 installed on the side is equal to or greater than the set value (eg, 23 kgf / cm 2), the solenoid valve 43a is closed and the solenoid valve 43b is opened to recondensate in the second condenser 32. It forms a cycle, the refrigerant liquid condensed in the second condenser 32 is expanded in the expansion valve 15 for heating and then evaporated in the outdoor heat exchanger 16 can further increase the coefficient of performance.

Reference numerals 19a and 19b denote check valves, 47a and 47b denote water supply and tapping pipes, 48 expansion tanks, and 49 condensation sensors.

Hereinafter, the operation of each mode will be described.

1) Hot water and heating mixed mode

  If only the solenoid valves 27a, 27b, 34b, 43a are opened, and the four-way valve 12 is operated so that the refrigerant flows in the solid line of the arrow, the compressor 11 is driven. A portion of the compressed high-temperature and high-pressure refrigerant vapor flows into the bypass conduit 21 to condense in the condenser 22 and heat the hot water to be heated through the endothermic heat exchanger 23 by the heat of condensation to heat the use-side heat exchanger 24. Refrigerant liquid condensed in the condenser 22 is mixed with a portion of a high temperature / high pressure refrigerant vapor compressed by the compressor 11 and discharged to the refrigerant conduit 17 side. Condensed or recondensed in the indoor heat exchanger 13 while flowing in line with the solid arrows through 12, and heated by heating the indoor air or hot water for heating by the heat of condensation, and the condensed refrigerant liquid is an expansion valve for heating. Outdoor heat after inflated in 15) It is evaporated in a ventilated 16 to repeat the basic cycle being drawn into the compressor (11).

When operating in the basic cycle as described above, the consumption of hot water is reduced or the heating load is reduced, so that condensation of the refrigerant vapor in the condenser 22 and the indoor heat exchanger 13 is incomplete, resulting in an indoor heat exchanger 13 of the refrigerant conduit 17. If the pressure of the refrigerant liquid flowing through the outlet side is greater than or equal to the set value, the solenoid valve 43a is closed and the solenoid valve 43b is opened so that the refrigerant liquid flows into the connecting pipe 42 and the second refrigerant conduit 31 while the second condenser ( After the recondensation at 32, an additional cycle is formed via the check valve 32, the cycle is expanded by the expansion valve 15 for heating, evaporated in the outdoor heat exchanger 16 and sucked into the compressor 11 by repeating the cycle. The coefficient is increased, and when the pressure value of the refrigerant liquid falls below the set value, it returns to the basic cycle.

As described above, when the refrigerant liquid is recondensed in the second condenser 32, the heat of condensation is transferred to the outdoor heat exchanger 16, so that the evaporation of the refrigerant liquid in the outdoor heat exchanger 16 is good, and the outside air temperature is lowered. By suppressing or preventing the formation of frost on the outdoor heat exchanger (16), this can also prevent a decrease in the coefficient of performance.

2) Hot water and cooling mixed mode

  If only the solenoid valves 27a, 27b, 34b, 39a, 43a are opened and the four-way valve 12 is operated to allow refrigerant to flow in the arrow virtual line, then the compressor 11 is driven. The hot water and hot water are generated in the heating circuit 20 as in the heating mode, and the refrigerant liquid condensed in the condenser 22 is compressed by the compressor 11 and discharged to the refrigerant conduit 17 side. And condensed or recondensed in the outdoor heat exchanger (16) while flowing in the arrow imaginary line, and then expanded in the cooling expansion valve (14) and evaporated in the indoor heat exchanger (13) by the evaporative heat thereof. Cooling is cooled to cool, and the refrigerant vapor evaporated from the indoor heat exchanger (13) is to repeat the cycle sucked into the compressor (11).

3) hot water mode

  When the solenoid valves 27b, 34a, 39a are opened and the compressor 11 is driven, all of the high temperature / high pressure refrigerant vapor compressed by the compressor 11 flows through the condenser 22, thereby heating the hot water and heating. Only hot water is generated in the hot water heating circuit 20 and used for necessary purposes, such as mixed mode or hot water and cooling mixed mode, and the refrigerant liquid condensed in the condenser 22 is recondensed in the second condenser 32 and then checked. The expansion of the expansion valve 15 for heating via the valve 33 and the evaporation of the outdoor heat exchanger 16 and the suction of the compressor 11 are repeated, and the second condenser 32 is repeated when the above cycle is repeated. By heat transfer of the condensation heat to the outdoor heat exchanger 16 it is possible to improve the evaporation efficiency of the refrigerant liquid to prevent the liquid back or liquid gap of the compressor to improve the reliability.

If the condensation of the refrigerant vapor is incomplete in the condenser 22 due to the decrease in the consumption of hot water when operating in the hot water mode as described above, the pressure of the refrigerant liquid at the outlet side of the condenser 22 rises and is output from the pressure sensor 40. When the pressure of the refrigerant liquid is higher than the set value, the solenoid valve 39b is also opened at the same time and recondensed in the second condenser 22 and the third condenser 38 to maintain a good compression ratio of the compressor 11 and to improve the coefficient of performance. When the pressure of the coolant liquid falls below the set value, the solenoid valve 39b is closed so that only the second condenser 22 functions.

By adding the hot water mode to the prior patent of the present inventors as described above, only the hot water can be generated, so that the function is diversified and can be conveniently used. Also, all of the high-temperature / high-pressure refrigerant vapor compressed by the compressor 11 can be used. Since it can be used to generate hot water, it is possible to generate hot water at a higher temperature than before, so that it can be used in a fan coil unit or the like, thereby increasing the use value.

4) Defrost mode

  When operating in the hot water and heating mixed mode, the dew condensation sensor 49 detects that the temperature drops below the dew point and causes frost on the outdoor heat exchanger 16, thereby opening the solenoid valves 34a and 39a and opening the solenoid valve ( When 34b) is closed, the high-temperature / high-pressure refrigerant liquid condensed in the condenser 22 is condensed in the second condenser 22, and the frost formed by heat transfer of the heat of condensation to the outdoor heat exchanger 16 is defrosted. Is a cycle in which the condensation heat is discharged from the indoor heat exchanger 13 and expanded together with the heated refrigerant liquid and then expanded in the heating expansion valve 15 and then evaporated in the outdoor heat exchanger 16 and sucked into the compressor 11. .

If the recondensing means 30 is also used as a defrost circuit while operating a mixed mode of hot water and heating as described above, the waiting time for the equalization of the refrigerant pressure after the defrost mode is omitted, compared to the defrosting by the conventional reverse cycle operation. In addition, the structure of the hot water and heating can be continuously maintained even when operating in the defrost mode, and the hot water is convenient and there is no change in the heating temperature. Comfortable heating is possible.

1 is a block diagram of an embodiment of the present invention

<Description of Major Symbols in Drawing>

10: basic refrigeration cycle 20: hot water heating circuit 30: recondensing means

32: second condenser 38: third condenser

Claims (4)

Compressor, 4-way valve, indoor heat exchanger, cooling expansion valve, heating expansion valve, outdoor heat exchanger and the 4-way valve in order to the refrigerant conduit, and the 4-way valve and the compressor by the refrigerant suction conduit A refrigeration cycle; By-pass conduit is connected between the compressor and the 4-way valve of the refrigerant conduit to install a condenser in the bypass conduit, an endothermic heat exchanger in the condenser, and a hot water heating circuit connected to a heat exchanger in the endothermic heat exchanger. Wow; Connect a second refrigerant conduit to the condenser outlet side of the bypass conduit and the expansion valve inlet side of the refrigerant conduit to install a second condenser to maintain a heat transfer relationship with the outdoor heat exchanger in the second refrigerant conduit; Heat pump system comprising recondensing means provided with a check valve opening on the outlet side of the condenser to the expansion valve for heating. The heat pump system according to claim 1, wherein the outdoor heat exchanger and the second condenser are formed in a fin tube shape, and the heat pipe of the second condenser is disposed between the heat pipes of the outdoor heat exchanger. The second refrigerant conduit is connected to a third refrigerant conduit bypassing the second condenser to install a third condenser in the third refrigerant conduit, and the second condenser inlet of the second refrigerant conduit. Heat pump system provided with a solenoid valve at the side and inlet of the third refrigerant conduit The connecting tube for bypassing the outdoor heat exchanger is connected to the inlet side of the expansion valve for heating of the refrigerant conduit and the inlet side of the second refrigerant conduit, and to the inlet of the connecting tube connection rear of the refrigerant conduit. Heat Pump System with Solenoid Valve

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