JP4631365B2 - Heat pump heating device - Google Patents

Description

  The present invention relates to a heat pump heating device used for heating such as hot water supply and heating.

  Conventionally, in this type of heat pump heating device, particularly in a hot water supply and heating device that uses CO2 as a refrigerant, the capability decreases when the temperature of the fluid to be heated in the radiator is high. Therefore, the refrigerant at the radiator outlet and the refrigerant at the compressor inlet A heat exchanger for exchanging heat is provided, and the capability is ensured by increasing the temperature at the compressor outlet and increasing the inlet temperature on the primary side of the radiator (for example, see Patent Document 1).

FIG. 9 shows a conventional heat pump heating apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 9, the compressor 1, the radiator 2, the expansion valve 3, the evaporator 4, and the heat exchanger 5 are configured.
JP 2004-101144 A

  However, in the conventional configuration, by providing a heat exchanger for exchanging the internal heat of the refrigerant circuit, the length of the refrigerant flow path increases, the pressure loss increases, and the efficiency decreases. Furthermore, when applied to a system with a wide range of operating conditions such as a hot water heater and the like, it is necessary to install a receiver for adjusting the amount of refrigerant, and there is a problem that the apparatus becomes large.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient and small heat pump heating apparatus.

  In order to solve the above-mentioned conventional problems, a heat pump heating apparatus according to the present invention connects a compressor, a radiator primary side, an expansion valve, an evaporator, and a heat exchanger primary side in order, and a refrigerant circuit in which refrigerant circulates. A heating circuit in which the secondary side of the heat exchanger and the secondary side of the radiator are connected and the fluid to be heated circulates, and a heat exchanger bypass provided in the heating circuit so as to bypass the secondary side of the heat exchanger Circuit, and a bypass amount control valve provided in the heat exchanger bypass circuit, the heat of the fluid to be heated in the heat exchanger without significantly increasing the length of the refrigerant flow path, By causing heat transfer to the inlet refrigerant, the discharge temperature is raised. As a result, the inlet temperature on the primary side of the radiator is increased, so that high performance can be achieved without reducing the performance.

  Moreover, the heat exchanger capacity can be controlled, the inlet temperature on the secondary side of the radiator can be kept constant, and the refrigerant distribution in the refrigerant circuit can be kept constant.

  According to the present invention, even when the temperature of the fluid to be heated is high, a large capacity can be exhibited, and a high-performance and small heat pump heating device can be realized.

  1st invention connects a compressor, a heat radiator primary side, an expansion valve, an evaporator, and the heat exchanger primary side in order, the refrigerant circuit through which a refrigerant circulates, the heat exchanger secondary side, the heat radiator 2 A heating circuit that connects the secondary side and in which the fluid to be heated circulates, a heat exchanger bypass circuit that is provided in the heating circuit so as to bypass the heat exchanger secondary side, and a heat exchanger that is provided in the heat exchanger bypass circuit The refrigerant circuit includes a bypass amount control valve and can increase the temperature of the fluid to be heated by increasing the discharge temperature of the compressor without significantly increasing the piping length of the refrigerant circuit. It is possible to obtain a high capacity with high efficiency while keeping the pressure loss at low.

  Moreover, the heat exchanger capacity can be controlled, the inlet temperature on the secondary side of the radiator can be kept constant, and the refrigerant distribution in the refrigerant circuit can be kept constant.

2nd invention is provided with the temperature detection means which detects the exit | outlet temperature of the radiator primary side, and the control apparatus which controls operation | movement of a bypass amount control valve, The said control apparatus is operation | movement of the said bypass amount control valve. Is controlled so that the detection value of the temperature detection means becomes constant, and even when the temperature of the fluid to be heated changes, the outlet temperature on the primary side of the radiator can be kept constant, Cycle fluctuation can be suppressed and operation can be stabilized .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

( Reference Example 1 )
FIG. 1 shows a block diagram of a heat pump heating apparatus in Reference Example 1 of the present invention.

  In FIG. 1, a refrigerant circuit 6 on the primary side is configured by connecting a compressor 1, a radiator 2, an expansion valve 3, an evaporator 4, and a heat exchanger 5 in order, and a heating circuit on the secondary side. 7 includes a heat storage tank 8, a circulation pump 9, a heat exchanger 5, and a radiator 2 connected in order.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the refrigerant in the refrigerant circuit 6 is heated to high temperature and high pressure by the compressor 1 and sent to the radiator primary side 2a, radiated to the water to be heated, and then the refrigerant is cooled to low temperature and low pressure by the expansion valve 3 and sent to the evaporator 4. Heat is absorbed from the air that is the secondary fluid supplied at 10. Further, the refrigerant discharged from the evaporator 4 is heated by heated water flowing through the heat exchanger secondary side 5b of the heat exchanger 5, exits the heat exchanger primary side 5a, and is sucked into the compressor 1 again. . At this time, the water to be heated in the hot water storage tank 8 flows from the heat exchanger secondary side 5b to the radiator secondary side 2b by the circulation pump 9, and absorbs heat from the refrigerant on the radiator secondary side 2b. It becomes hot and is stored in the upper part of the hot water tank 8.

  When the temperature in the hot water tank 8 is high, for example, when the critical point of CO2 refrigerant or the like is exceeded, the enthalpy difference on the high pressure side is remarkably reduced and the efficiency is lowered. Since it is raised by the heat exchanger 5 and the discharge temperature is raised to increase the enthalpy difference, the efficiency can be kept high. Furthermore, since the refrigerant flow path of the heat exchanger 5 is only the radiator primary side 2a, the length of the refrigerant flow path does not increase significantly, so that a decrease in efficiency due to pressure loss can be reduced.

( Embodiment 1 )
FIG. 2 shows a configuration diagram of the heat pump heating apparatus according to the first embodiment of the present invention.

  In the present embodiment, the refrigerant circuit 6 is provided with a heat exchanger bypass pipe 11 that bypasses the heat exchanger secondary side 5 b and a bypass amount control valve 12 provided in the heat exchanger bypass pipe 11.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the temperature of the heated water sent from the heat storage tank 8 by the circulation pump 9 is sufficiently low, the heated water is caused to flow through the heat exchanger bypass pipe 11 by the bypass amount control valve 12 and the radiator secondary side 2b. By directly flowing water to be heated, the enthalpy difference in the radiator 2 can be set large, and a large value can be obtained for both capacity and efficiency.

  On the other hand, when the temperature of the heated water is high, the bypass amount control valve 12 is controlled to flow to the heat exchanger 5 side, and the refrigerant sucked in the compressor 1 is heated with the high temperature heated water. 1 discharge temperature, that is, the inlet temperature of the primary side 2a of the radiator can be increased, so that it can be operated with high capacity and high efficiency.

( Embodiment 2 )
FIG. 3 shows a block diagram of a heat pump heating apparatus according to the second embodiment of the present invention.

  In the present embodiment, the temperature detection means 13 for detecting the outlet temperature of the radiator primary side 2a in the refrigerant circuit 6, and the control device 14 for controlling the bypass amount control valve 12 according to the detected value of the temperature detection means 13; Is provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the temperature of the water to be heated is low, the water to be heated flows through the heat exchanger bypass pipe 11. When the temperature of the water to be heated is high, the bypass amount control valve 12 is heated to the heat exchanger 5 side. The bypass amount control valve 12 is controlled by the controller 14 in accordance with the detection value of the temperature detection means 13. Thereby, the exit temperature of the heat radiator primary side 2a can be kept at a constant value.

  In this way, by making the cycle condition constant, the refrigerant distribution in the refrigerant circuit can be kept constant, so that stable operation can be realized without adding a refrigerant amount adjusting device such as a receiver. Can do.

( Reference Example 2 )
FIG. 4 shows a configuration diagram of a heat pump heating apparatus according to Reference Example 2 of the present invention.

In this reference example , a temperature detection means 13 for detecting the outlet temperature of the radiator primary side 2a, and a control device for controlling the fan 10 for supplying air to the evaporator secondary side in accordance with the detected value of the temperature detection means 13. 14 is provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the temperature detected by the temperature detection means 13 is lower than a predetermined temperature, the control device 14 reduces the rotation of the fan 10 and conversely increases the rotation of the fan 10 when the temperature is higher than the predetermined temperature. By controlling, it is possible to keep the cycle state stable by keeping the outlet temperature of the primary side 2a of the radiator constant.

( Reference Example 3 )
FIG. 5 shows a block diagram of a heat pump heating apparatus of Reference Example 3 of the present invention.

In this reference example , an evaporator bypass pipe 15 that bypasses the expansion valve 3 and the evaporator 4, a flow control valve 16 provided in the evaporator bypass pipe 15, and a control that controls the expansion valve 3 and the flow control valve 16. A device 13 is provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, if the temperature of the heated water becomes higher than an assumed value and flows into the heat exchanger 5, the intake gas temperature of the compressor 2 also rises and the temperature in the compressor 1 may exceed the allowable value. At this time, the refrigerant temperature can be lowered by opening the flow control valve 16 provided in the evaporator bypass pipe 15. Since the control device 13 controls the flow rate control valve 16 according to the detection value of the temperature detection means 13 provided at the outlet of the compressor 1, the outlet temperature of the compressor 1 can be controlled to an arbitrary value. High-reliability and high-performance operation can be realized.

( Reference Example 4 )
FIG. 6 shows a block diagram of a heat pump heating apparatus of Reference Example 4 of the present invention.

In this reference example , a radiator primary branch circuit 17 branched from the middle of the conduit of the radiator primary side 2a and connected between the evaporator 4 and the heat exchanger 5, and a radiator primary branch circuit 17 and a control device 13 for controlling the expansion valve 3 and the flow control valve 16 are provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the refrigerant that flows into the primary side 2a of the radiator branches from the middle of the pipe, merges with the refrigerant flowing through the evaporator 4 through the flow control valve 16, and flows to the heat exchanger 5, so that the compressor 1 is operated at a constant level. In this state, the ability of the radiator 1, that is, the heating ability can be controlled, and a device excellent in durability and controllability can be realized.

( Reference Example 5 )
FIG. 7 shows a block diagram of a heat pump heating apparatus of Reference Example 5 of the present invention.

  In this reference example, the radiator secondary bypass pipe 18 bypassing the radiator secondary side 2b, the flow control valve 16 provided in the radiator secondary bypass pipe 18, and the downstream of the flow control valve 16 are provided. A temperature detection unit 13 and a control device 14 that controls the flow rate control valve 16 according to the detection value of the temperature detection unit 13 are provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the detected value of the temperature detecting means 13 is less than or equal to a predetermined value, the opening degree of the flow control valve 16 is decreased and the water to be heated flows through the radiator 2, and when the detected value is larger than the predetermined value, the flow control valve The controller 16 is controlled to increase the degree of opening 16 and cause the water to be heated to flow through the radiator secondary bypass pipe 18. Thereby, even when the operation on the refrigeration cycle side is unstable, the water to be heated can be stably heated to a predetermined temperature, and the temperature stratification of the heat storage tank 8 is also stabilized, so that an efficient operation can be performed.

( Reference Example 6 )
FIG. 8 shows a configuration diagram of a heat pump heating apparatus according to Reference Example 6 of the present invention.

  In this reference example, it is provided in the radiator secondary bypass pipe 18 and the radiator secondary bypass pipe 18 that are branched from the middle of the pipe of the radiator secondary side 2a and piped to the outlet of the radiator secondary side 2a. The flow rate control valve 16, the temperature detection means 13 provided downstream of the flow rate control valve 16, and the control device 14 that controls the flow rate control valve 16 according to the detection value of the temperature detection means 13 are provided.

  About the heat pump heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, a part of the heated water flowing into the radiator secondary side 2a branches off from the middle of the pipe and flows to the radiator secondary bypass pipe 18, and is recombined by the flow control valve 16 at a predetermined temperature. It can be mixed and stored in the heat storage tank 8. At this time, since the outlet of the radiator secondary side 2a becomes high temperature, high temperature water can be obtained by taking it out before the flow control valve 16.

  As described above, the heat pump heating device according to the present invention can achieve high efficiency and high efficiency even when the fluid to be heated is at a high temperature, and the refrigerant distribution in the refrigerant circuit can maintain a constant state, so there is little fluctuation. Since stable operation is possible, it can be applied to uses such as warm water floor heating, bathroom heating drying, and clothes dryers.

The circuit block diagram of the heat pump heating apparatus in the reference example 1 of this invention 1 is a circuit configuration diagram of a heat pump heating apparatus according to Embodiment 1 of the present invention. The circuit block diagram of the heat pump heating apparatus in Embodiment 2 of this invention The circuit block diagram of the heat pump heating apparatus in the reference example 2 of this invention The circuit block diagram of the heat pump heating apparatus in the reference example 3 of this invention The circuit block diagram of the heat pump heating apparatus in the reference example 4 of this invention The circuit block diagram of the heat pump heating apparatus in the reference example 5 of this invention The circuit block diagram of the heat pump heating apparatus in the reference example 6 of this invention Circuit diagram of a conventional heat pump heating device

DESCRIPTION OF SYMBOLS 1 Compressor 2 Radiator 2a Radiator primary side 2b Radiator secondary side 3 Expansion valve 4 Evaporator 5 Heat exchanger 5a Heat exchanger primary side 5b Heat exchanger secondary side 6 Refrigerant circuit 7 Heating circuit 8 Hot water storage Tank 9 Circulation pump 10 Fan 11 Heat exchanger bypass piping 12 Bypass amount control valve 13 Temperature detection means 14 Controller 15 Evaporator bypass piping 16 Flow rate control valve 17 Radiator primary side branch circuit 18 Radiator secondary side bypass piping

Claims (2)

Compressor, radiator primary side, expansion valve, evaporator, heat exchanger primary side are connected in order, refrigerant circuit through which refrigerant circulates, heat exchanger secondary side, radiator secondary side, A heating circuit in which a fluid to be heated circulates, a heat exchanger bypass circuit provided in the heating circuit so as to bypass the heat exchanger secondary side, and a bypass amount control valve provided in the heat exchanger bypass circuit Heat pump heating device provided. Temperature detecting means for detecting the outlet temperature of the primary side of the radiator and a control device for controlling the operation of the bypass amount control valve, wherein the control device controls the operation of the bypass amount control valve with the temperature detecting means. The heat pump heating device according to claim 1, wherein the detected value is controlled to be constant.

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