JPH04113168A - Heat pump system - Google Patents

Abstract

PURPOSE:To perform an energy saving by a method wherein thermal medium compressed to a low temperature and low pressure is discharged from one discharging pipe of one compressor and another thermal medium compressed to a high temperature and high pressure is discharged from the other discharging pipe. CONSTITUTION:As the first control valve 3 is closed and the second control valves 5 and 6 are fully opened, thermal medium compressed to a high temperature and high pressure is passed from a compressor 1 through a discharging pipe 2b, fed to a hot water storing heat exchanger 8 of a branch pipe 10 and then heat exchanged within the hot water storing device 18. The thermal medium compressed to a low temperature and low pressure passes from the compressor 1 through a discharging pipe 2a, fed into a heating heat exchanger 7 in the branch pipe 9 and then a heat exchanging operation is carried out. In turn, the third control valve is controlled in its flow rate such that the thermal medium of high temperature and high pressure passing through the discharging pipe 2b flows to the branch pipe 9 and at the same time the second control valves 5 and 6 are fully opened. With such an arrangement, an amount of thermal radiation of the hot water storing heat exchanger 8 is reduced and at the same time the thermal medium of high temperature and high pressure is flowed into the branch pipe 9 and an amount of radiation of the heating heat exchanger 7 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an energy-saving heat pump system that is capable of efficiently operating an indoor heating device and a hot water storage device simultaneously using two compressors.

"Conventional technology" In general, indoor heating devices using heat pumps are
The compressor compresses the heat medium to a low-temperature, low-pressure state and sends it into the heat exchanger installed indoors, and the heat exchanger operates as a radiator, thereby warming the indoor air. . In addition, in residential hot water storage devices that use heat pumps, a heat exchanger is installed inside the hot water storage device that stores water (stored water), and the heat medium is compressed into high temperature and high pressure by a compressor. The stored hot water is heated to a predetermined temperature by the amount of heat released by the heat exchanger.

To explain more specifically the heat medium compressed by the compressor, the condensation temperature of the heat medium condensed to a low temperature and low pressure that is fed into the heat exchanger of the heating device is about 45°C, which causes the indoor temperature to decrease. is maintained at an optimum temperature of approximately 23°C. In addition, the condensation temperature of the heat medium compressed to high temperature and high pressure that is sent to the heat exchanger of the hot water storage device is 60°
The temperature of the water in the hot water storage device is increased to approximately 55°C.

By the way, it is conceivable that the compressor used in the system is equipped with a dedicated machine for each of the heating device and the hot water storage device, and the system is operated by compressing each to the above-mentioned condensing temperature, but the initial cost and the size of the device. There is a weight problem, and for boat fishing, a single compressor is used that has increased crushing capacity for the heat medium to match the capacity of the hot water storage system. A heat medium is sent to each heat exchanger of the hot water storage device and the hot water storage device.

"Problem to be solved by the invention" However, when operating a system using a single compressor with increased capacity as described above, It is not easy to control the heat distribution of the heat transfer medium, which makes it difficult to operate the system efficiently.In other words, as is clear from the Mollier diagram of the conventional system shown in Figure 7, the ability When one increased compressor is operated, the heat medium Q1 sent to the heating device, which is sufficient if it is in a compressed state at a low temperature and low pressure corresponding to a condensation temperature of about 45°C, changes to the heat medium Q1 sent to the hot water storage device. Similarly, the heat medium Q1 is compressed to a high temperature and high pressure state (condensation temperature of 60°C) and is sent in. Therefore, the heat medium Q1 releases heat to the outside and is brought into a low temperature and low pressure state before being sent to the heating device. , a large amount of extra power is consumed due to the compression work W1 of the heat medium Q1, resulting in an inefficient and non-energy-saving system.

In addition, even when it is desired to temporarily increase the capacity of a heating device or hot water storage device due to a drop in outside air during the winter, etc., the flow rate of the heat medium can be controlled efficiently in a short period of time to maintain each device at the specified capacity. It was not easy to operate.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an energy-saving type heat pump system that can efficiently utilize the capabilities of a heating device and a hot water storage device and operate them simultaneously using two compressors. The purpose is to

“Means for Solving the Problems J” The heat pump system according to claim 1 according to the present invention includes:
A connecting pipe having a first control valve is connected between two discharge pipes provided in a compressor having two compression parts that separately discharge heat medium to the outside, and a second pipe is connected to the two discharge pipes. First and second branch pipes in which a control valve, a heat exchanger, and an expansion valve are connected in series are respectively connected, and the expansion valve sides of these first and second branch pipes are connected to one end of a flow divider. and a heat exchanger connected in series to the other end of the flow divider and a third branch pipe connected to the suction pipe of the compressor, the heat exchanger being connected to the first branch pipe. The heat exchanger connected to the second branch pipe is used as a heat radiator, and the heat exchanger connected to the third branch pipe is used as a heat absorber.

Further, in the heat pump system according to claim 2, the compressor is provided with two compression cylinders, and the discharge piping of one of the compression cylinders of the compressor has a third control valve. The present invention is characterized in that a fourth branch pipe is provided whose end is connected to the suction pipe of the other compression cylinder.

"Operation" According to the heat pump system of the present invention, a compressor is used, and a heat medium compressed to a low temperature and low pressure state is discharged from one discharge pipe of the compressor according to the operating status of the system, The first control valve and the second control valve discharge the compressed heat medium to a high temperature and pressure state from the other discharge pipe.
By operating the two second control valves, the flow rate of the heat medium sent to the heat exchanger connected to the first branch pipe and the heat exchanger connected to the second branch pipe is controlled. The compressor can be operated efficiently according to its purpose, and the compressor can be operated with reduced heat medium compression work, that is, with less power consumption.

"Embodiments" Hereinafter, embodiments of the heat pump system of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows the basic configuration of a first embodiment of the present invention.

This embodiment includes a compressor 1, a discharge pipe 2a through which a heat medium compressed to a low temperature and low pressure state is discharged from the compressor 1, and a discharge pipe through which a heat medium compressed to a high temperature and high pressure state is discharged from the compressor 1. 2b, and a connecting pipe 4 connected to these discharge pipes 2a and 2b. First and second branch piping 9. IO and
Branch piping9. The connecting pipe 4 has a heat exchanger 13 connected to one end of the flow divider 11 and the other end connected to the compressor l, and a third branch pipe 15. Second branch pipe9. A first control valve 3. Second control valve 5
．． 6. An accumulator 14 is also connected.

To explain this nostem more specifically, the compressor l is provided with two discharge pipes 2 a and 2 b, and between these two discharge pipes 2 a and 2 b is a first control valve. 3 are connected in series to a connecting pipe 4.

A second control valve 5 is provided in the two discharge pipes 2 a and 2 b.
．． 6, a heat exchanger 7.8, and an expansion valve 16.17 are connected in series to first and second branch pipes 910, respectively. The heat exchanger 8 connected to the first branch pipe 9 is installed indoors and operates as a heating device, and the heat exchanger 8 connected to the second branch pipe 10 is filled with water. It is disposed inside the hot water storage device 18 and operates as a heater. The expansion valve 16.17 sides of these first and second branch pipes 9.10 are connected to one end of the flow divider 11. Furthermore, at the other end of the flow divider 11,
A heat exchanger 13 and an accumulator 14 installed outdoors and operating as heat absorbers are connected to a third branch pipe 15 connected in series, or to the suction pipe 12 of the compressor 1.

Next, the members used in this Nostem will be specifically explained.

First, the compressor 1 compresses the heat medium sent from the accumulator 14 and discharges it from two discharge pipes 2a2b. Depending on the operating conditions, the room temperature where the heat exchanger 7 is installed may be around 20°C.
When the temperature of the hot water storage in which the heat exchanger 8 is installed is about 40°C, the heat medium sent out from the discharge pipe 2a is compressed to a low temperature and low pressure state inside the compressor 1 and discharged, and the heat medium is discharged from the discharge pipe 2b. The heat medium sent out from the compressor 1 is compressed to a high temperature and high pressure state inside the compressor 1 and discharged, and is controlled by the related switching control of the first and second control valves 3.5. The heat exchanger 8 is configured to pass through the heat exchanger 8.

In addition, the heat exchanger 7 installed indoors (hereinafter abbreviated as heating heat exchanger) is formed with finned piping, etc. so that the contact area with the outside air is large, and is used as a radiator. The amount of heat released is adjusted by switching the first and second control valves 3.5.

The heat exchanger 8 (hereinafter abbreviated as hot water storage heat exchanger) disposed in the hot water storage device 18 has a large contact area with the heat storage medium due to a finned corrugated pipe or the like, similar to the heat exchanger 7. The heat dissipation amount is adjusted by switching the first and second control valves 3.6.

On the other hand, the heat exchanger 13 installed outdoors (hereinafter abbreviated as an endothermic heat exchanger) is formed by finned piping or the like so as to have a large contact area with the outside air, and operates as a heat absorber.

The expansion valves 16 and 17 are electronic ones,
It has the effect of lowering the pressure of the heat medium that has passed through the heat exchangers 7 and 8 through a narrow passage, and gradually and automatically adjusts the opening degree of the valve.

The flow divider 11 is connected to one end of each branch pipe 9.10, and is configured to flow toward the branch pipe 15.

Note that the control valves 3, 5.6 may be a flow rate control valve or the like whose opening degree can be changed continuously.

Next, Tables 1 and 2 show the operating states of the first, second and third control valves 3.5.6 during various operations of the system constructed as described above.

In addition, in Tables 1 and 2, open...open state, closed...
...Closed state, operation...Indicates flow rate control.

Below is the margin.

■ in Table 1 indicates the opening/closing states of the first control valve 3 and the second control valve 5.6 when it is desired to operate the heating device and the hot water storage device at predetermined capacities, respectively. In this case,
The first control valve 3 is closed and the second control valve 5.6 is fully opened. As a result, the heat medium compressed to a high temperature and high pressure state is
The hot water is sent from the compressor 1 through the discharge pipe 2b to the hot water storage heat exchanger 8 of the branch pipe IO, and heat exchanged inside the hot water storage device 18. Further, the heat medium compressed to a low temperature and low pressure state passes through the discharge pipe 2a from the compressor 1, and is sent to the heating heat exchanger 7 of the branch pipe 9, where it undergoes heat exchange.

Moreover, ■ in Table 1 indicates a case where the capacity of the hot water storage device is lowered and the reduced capacity of the hot water storage device is sent to the heating device to increase the capacity of the heating device.

In this case, the flow rate of the third control valve is controlled so that the high-temperature, high-pressure heat medium passing through the discharge pipe 2b flows into the branch pipe 9 side, and the second control valve 5.6 is fully opened. As a result, the amount of heat radiated from the hot water storage heat exchanger 8 decreases, and since a high-temperature, high-pressure heat medium flows into the branch pipe 9, the amount of heat radiated from the heating heat exchanger 7 increases.

The heat medium sent to the heating device and the storage device shown in (1) and (2) in Table 1 is as shown in the Mollier diagram shown in FIG. That is, the heat medium Q3 compressed to a low temperature and low pressure state and discharged from the discharge pipe 2a has a compression work W3 smaller than the compression work fiW shown in FIG. The heat medium Q4 to be discharged has the same compression work W4 as Q.

In this way, in this embodiment, by using - compressors 1, the energy consumption is reduced by the difference in compression work of W, < W, and the first control valve 3, Second
The capacity of the heating device can be adjusted by opening and closing the control valves 5 and 6.

Next, FIGS. 2 to 4 show a specific embodiment of the compressor 1 used in the first embodiment of the present invention.

As shown in FIG. 4, this compressor 1 is a twin rotary type compressor in which two compression cylinders 20 and 21 are formed and capable of two-stage compression. The compressor 1 is rotatably installed inside a sealed case 22. A shaft 24 is supported by a rotor 23, and two rollers 25, 26 fixed to the lower part of the shaft 24 are used for compression. The cylinder 20.21 is arranged so as to be rotatable inside the cylinder 20.21, and the compression cylinder 20.21 is connected to the accumulator 14 by two suction pipes 12a and 12b.
The heat medium is fed into the rollers 25 and 26.
After the heat medium in the compression cylinders 20, 21 is compressed by the rotation of
b to each heat exchanger 78.

Here, one suction pipe 12a is provided with a check valve 27, and one end of this suction pipe 12a communicates with the other discharge pipe 2b, and an oil safe filter 28 (oil separator) and an oil safe filter 28 (oil separator) are connected to the suction pipe 12a. The other end of the fourth branch pipe 30 is connected to the third control valve 29 in series.

As shown in FIG. 3, the oil separator 28 is provided with a perforated plate 32 inside a closed cylindrical body 31, with an opening 33a facing the -E direction from the lower part of the cylindrical body 31 and a perforated plate 32. A piping 33 extending above the plate 32 is provided, and
A pipe 34 is disposed extending from the top of the cylinder 31 with an opening 34a facing downward and to a position above the perforated plate 32, and a return pipe is provided in the opening bored in the bottom of the cylinder 31. It has a structure in which 35 are arranged. As shown in FIG. 2, the oil separator 28 communicates with the piping 33 with the opening 33a facing upward or with the other compression cylinder 21, and the return piping 35 communicates with the suction side of the third control valve 29. The f-2 pipe 34 is connected with the other discharge pipe 2b provided with the fifth control valve 36, with the opening 34a facing downward.

In the compressor I having the above configuration, in order to send the heat medium to the heat exchanger 7.8 in a two-stage compressed state, the fifth control valve 36 is
By closing the third control valve 29 and operating the compressor l by fully opening the third control valve 29, the heat medium compressed in the other compression cylinder 21 passes through the fourth branch pipe 30 and enters the suction pipe 12a. Flow into. Then, the heat medium is further compressed to a high temperature and high pressure state in one compression cylinder 20 of the compressor 1 while being prevented from flowing toward the accumulator 14 side by the check valve 27. It is sent from the discharge pipe 2a to the heat exchanger 7.8. Therefore, it becomes possible to obtain higher temperatures. Further, the fifth control valve 36
By adjusting the opening degree of the first stage compressed heat medium, it is also possible to separate the first stage compressed heat medium.

Furthermore, in order to control the flow rate of the heat medium at high temperature and high pressure,
The third control valve 29 may be controlled while the fifth control valve 36 is closed.

In this way, by using the compressor l mentioned above,
It is possible to change the condensation temperature and capacity of the heat medium, and it is possible to operate the system with high efficiency with -1 compressor 1.

As can be easily understood from the above, in the heat pump system of this embodiment, a heat medium compressed to a low temperature and low pressure state is discharged from one discharge pipe 2a of the compressor l of the table, and The heat medium compressed to a high temperature and high pressure state is discharged from the other discharge pipe 2b, and the first control valve 3 and the two control valves 5 and 6 are operated in a related manner. As a result, as shown in FIG. 6, it is possible to realize a system that operates the compressor l with less power consumption and simultaneously operates the heating device and the hot water storage device while reducing the compression work of the heat medium. I can do it.

The system also includes two compression cylinders 20.21
Since the compressor 1 equipped with the compressor 1 capable of two-stage compression is used, the condensation temperature of the heat medium can be easily changed to a high temperature.

Note that the present invention is not limited to the embodiments described above, and the number of heat exchangers and the like can be changed as appropriate based on the design requirements.

Next, FIG. 5 is a circuit diagram showing a second embodiment of the heat pump system of the present invention.

In this embodiment, one discharge pipe 2a of the compressor l
, the first branch pipe 9 to which the heating heat exchanger 7 is connected
The third branch pipe 15, to which the control valve 43 and the endothermic heat exchanger 13 are connected, and the fifth branch pipe 37 are branched and connected so as to be connected in parallel. And, on the suction side of these branch pipes 9°15.37, there are 6th pipes, respectively.
Four branch pipes 39 equipped with control valves 38 are connected,
These branch pipes 39 are connected to the suction side of the accumulator 14.

The fifth branch pipe 37 has a seventh control valve 40, a heat exchanger 41, and an expansion valve 42 connected in series,
The heat exchanger 41 of this fifth branch pipe 37 is arranged at the top of the hot water storage device 18 where water is stored, while the heat exchanger 8 of the second branch pipe IO is arranged at the bottom of the hot water storage device. It has a built-in structure.

Table 3 shows the operation of each control valve in the circuit diagram of the second embodiment shown in FIG.

In Table 3, open...open state and closed...open state are not shown.

■...For simultaneous heating and hot water storage using two-stage compression, when storing hot water rapidly.

■・・・When performing heating and hot water storage with normal compression function.

■...When starting up heating and hot water storage.

The following description is omitted. This second embodiment is functionally basically the same as the circuit diagram shown in the first embodiment, or in this case, there are two heat exchangers inside the hot water storage device 18. 10 and 41 are installed, it is possible to raise the temperature of the stored hot water in a short time (states of ■ and ■). Branch piping 3
By operating the heat exchanger 41 of No. 7 as a heat absorber, the heating device and the hot water storage device can be operated normally in a short time.

Note that the oil separator 28 separates oil in the operations of ■ and ■, and the separated oil passes through the control valve 2 between
9 and returns to compressor 1.

"Effects of the Invention" As explained above, according to the heat pump stem according to claim 1 of the present invention, the heat medium compressed to a low temperature and low pressure state is discharged from one discharge pipe of the compressor, In addition, the heat medium compressed to a high temperature and high pressure state is discharged from the other discharge pipe, and the flow rate of the heat medium is controlled by related operations of the first control valve and the two control valves. To save energy by being able to efficiently operate the equipment and the hot water storage device at the same time according to the purpose, and by reducing the work of compressing the heat medium and operating the compressor with less power consumption. I can do it.

Furthermore, according to the heat bomb nostem according to claim 2,
The combination of a compressor equipped with two compression nolinders and piping enables two-stage compression, making it possible to further increase the temperature of the heat medium and, therefore, to obtain a higher temperature.

[Brief Description of the Drawings] Figures 1 to 6 show an embodiment of the heat pump stem of the present invention, and Figure 1 is a circuit diagram showing the first embodiment of the present invention, and Figure 2 is a circuit diagram showing the first embodiment of the present invention. 4 to 4 show the compressor used in the present invention, FIG. 2 is a schematic circuit diagram of the compressor, FIG. 3 is a sectional view showing the oil separator used, and FIG. 4 is a compressor used in the present invention. 5 is a circuit diagram showing the second embodiment of the present invention; FIG. 6 is a Mollier diagram showing the work of compressing the track medium by the compressor used in the present invention; FIG. 7 is a Mollier diagram showing the amount of work of compressing the murine medium by the compressor used in the conventional heat pump stem. ...Compressor, 2 a, 2 b...
...Discharge piping, ...First control valve. 4...
・・Connection pipe, 6・・・Second control valve, ・・・Heat exchanger (heat exchanger for heating), ・・・Heat exchanger (heat exchanger for hot water storage),・...First branch pipe, 0...Second branch pipe, 11...Buncher, 2a, +2b...Suction pipe, 5...Third Branch piping, 6.17... Expansion valve, 18... Hot water storage device, 0.21... Compression nolinda, 9... Third control valve, 0. ...Fourth branch pipe.

Claims (2)

[Claims] (1) A connecting pipe having a first control valve is connected between two discharge pipes provided in a compressor having two compression parts that separately discharge a heat medium to the outside, and a connecting pipe having a first control valve is connected to the two discharge pipes. A second control valve, a heat exchanger, and an expansion valve are connected in series to first and second branch pipes, respectively, and these first and second branch pipes are connected in series.
and a third branch pipe in which the expansion valve side of the second branch pipe is connected to one end of the flow divider, a heat exchanger is connected in series to the other end of the flow divider, and the third branch pipe is connected to the suction pipe of the compressor. a heat exchanger connected to the first branch pipe and a heat exchanger connected to the second branch pipe;
A heat pump system characterized in that a heat exchanger connected to a third branch pipe is used as a radiator, and a heat exchanger connected to a third branch pipe is used as a heat absorber. (2) The compressor is equipped with two compression cylinders,
and the discharge pipe of one compression cylinder of the compressor is provided with a fourth branch pipe having a third control valve and whose discharge end is connected to the suction pipe of the other compression cylinder. The heat pump system according to claim 1, characterized in that: