JP2004226036A - Heat pump type hot water supply system - Google Patents

Heat pump type hot water supply system Download PDF

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Publication number
JP2004226036A
JP2004226036A JP2003016349A JP2003016349A JP2004226036A JP 2004226036 A JP2004226036 A JP 2004226036A JP 2003016349 A JP2003016349 A JP 2003016349A JP 2003016349 A JP2003016349 A JP 2003016349A JP 2004226036 A JP2004226036 A JP 2004226036A
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Japan
Prior art keywords
water
refrigerant
heat exchanger
coil body
pipe
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JP2003016349A
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Japanese (ja)
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JP3949589B2 (en
Inventor
Kazuyoshi Irisawa
Kaoru Katayama
Yasuji Ogoshi
Tomoaki Tanabe
一義 入澤
靖二 大越
馨 片山
智明 田邊
Original Assignee
Toshiba Electric Appliance Co Ltd
Toshiba Kyaria Kk
東芝キヤリア株式会社
東芝機器株式会社
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Priority to JP2003016349A priority Critical patent/JP3949589B2/en
Publication of JP2004226036A publication Critical patent/JP2004226036A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type hot water supply system capable of suppressing cost increase by integrating a water heat exchanger of a refrigerating cycle circuit with a water heat exchanger of a water circuit, correctly detecting the temperature of condensation without thermal effect of water, improving the detection accuracy and performing correct high-pressure control. <P>SOLUTION: Water heat exchangers 5 and 13 of a refrigerating cycle circuit 1 and a water circuit 10 comprise a plurality of coil assemblies 40 comprising an inner coil body 50 and an outer coil body 60 in which a refrigerant pipe 5P and a water pipe 13P overlap alternately and are wound in a coil, and a refrigerant connection pipe PA and a water connection pipe PB to communicate one end of the refrigerant pipe with one end of the water pipe of the inner and outer coil bodies. The refrigerant connection pipe and the water connection pipe are separated from each other, a condensation temperature sensor 22 to detect the temperature of the refrigerant is fitted to the refrigerant connection pipe, and a control device 30 to perform the high-pressure control of the refrigerating cycle circuit when the detected temperature of the condensation temperature sensor exceeds a predetermined value is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat pump water heater that stores hot water using, for example, midnight power.
[0002]
[Prior art]
For example, heat pump water heaters that use a midnight electric power to drive a compressor of a refrigeration cycle circuit, discharge condensing heat accompanying the refrigeration cycle into water, heat the water, and convert the water into hot water are often used.
[0003]
The present applicant has previously disclosed in Patent Document 1 that a heat pump water heater using R22 refrigerant, which is a conventional HCFC refrigerant, is most suitable for R410A refrigerant or R407C refrigerant, which is a kind of HFC refrigerant having little effect on the environment. Disclosed is a heat pump water heater having a configuration.
[0004]
[Patent Publication 1]
JP-A-2002-89958
This heat pump water heater includes a refrigeration cycle circuit and a water circuit. In the refrigeration cycle circuit, a compressor, a four-way valve, a water heat exchanger, a pressure reducing device, and an air heat exchanger are sequentially communicated via a refrigerant pipe, and the refrigerant is conducted to perform a well-known refrigeration cycle operation.
[0005]
In the water circuit, the pump, the water heat exchanger, and the hot water storage tank are sequentially communicated via a water pipe, conduct water, exchange heat with the refrigerant in the water heat exchanger, change the water, and store the hot water. Has become.
[0006]
The water heat exchanger of the refrigeration cycle circuit and the water heat exchanger of the water circuit are assembled so as to be integrated. In other words, the refrigerant pipe having a relatively small diameter and the water pipe having a larger diameter are wound in a coil shape with the same diameter and at a predetermined pitch.
[0007]
The respective pipes are fitted into the respective coil spaces and fixed by appropriate means such as brazing. In the cross section of the completed water heat exchanger, refrigerant pipes and water pipes are alternately overlapped to form a straight line. Since the pipes are close to each other over the entire length, a heat exchange effect between the refrigerant and the water can be obtained over the entire length.
[0008]
[Problems to be solved by the invention]
By the way, in such a heat pump water heater, as a high-pressure control for suppressing an increase in the high pressure, a condensing temperature sensor for detecting the condensing temperature of the refrigerant must be mounted in the refrigeration cycle circuit and controlled based on the detection signal of the sensor. Must.
[0009]
Specifically, the condensing temperature sensor is closely fixed to the refrigerant pipe of the water heat exchanger, detects the condensing temperature of the refrigerant flowing in the pipe, and sends a detection signal to the control circuit. Ideally, it is desirable to detect the temperature of the refrigerant just in the middle of the inlet and outlet where the temperature of the refrigerant averages.
[0010]
However, since the water heat exchanger is formed by closely adhering the refrigerant pipe and the water pipe over the entire length, and the heat exchange action is performed over the entire length, it is impossible to extract and detect only the refrigerant temperature. It is.
[0011]
That is, since the water is heated by the refrigerant, the condensing temperature of the refrigerant is affected by the temperature of the low-temperature water, and a condensing temperature lower than the temperature corresponding to the actual condensing pressure is detected. Therefore, high-pressure control of the compressor corresponding to a low refrigerant condensation temperature is performed, and accurate high-pressure control corresponding to an accurate condensation pressure cannot be performed.
[0012]
Manufacture a water heat exchanger with a structure in which only the middle part of the refrigerant pipe is projected or recessed in the radial direction so as to be separated from the upper and lower water pipes, and a condensation temperature sensor is provided at the middle part of the separated refrigerant pipe Is most suitable, but to obtain such a water heat exchanger, the number of steps is increased and the cost is adversely affected.
[0013]
The present invention has been made to solve the above-described problems, and has an object to provide a basic configuration in which a water heat exchanger of a refrigeration cycle circuit and a water heat exchanger of a water circuit are integrated. To provide a heat pump type water heater that can detect the correct condensation temperature of the refrigerant without being affected by the thermal effect of water without changing the cost and improving the detection accuracy and the corresponding high-pressure control. Is what you do.
[0014]
[Means for Solving the Problems]
To satisfy the above object, the present invention provides a compressor, a four-way valve, a water heat exchanger, a pressure reducing device and an air heat exchanger, a refrigeration cycle circuit that communicates via a refrigerant pipe, a pump, a water heat exchanger and A water circuit that sequentially communicates with the hot water storage tank via a water pipe, wherein the condensed heat released from the water heat exchanger of the refrigeration cycle circuit is absorbed by the water heat exchanger of the water circuit, and the hot water is stored in the hot water storage tank. Heat pump water heater
The refrigeration cycle circuit and the water heat exchanger of the water circuit are configured such that a plurality of coil bodies wound on a coil are formed by alternately superimposing refrigerant pipes and water pipes, and one end of the refrigerant pipes of these coil bodies is mutually connected. A refrigerant connection pipe and a water connection pipe communicating one end of the water pipe with each other, separating at least one set of the refrigerant connection pipe and the water connection pipe from each other, and detecting the temperature of the refrigerant in the refrigerant connection pipe. And a control means for performing high-pressure control of the refrigeration cycle circuit when the temperature detected by the condensation temperature sensor exceeds a predetermined temperature.
[0015]
By adopting the means for solving such a problem, the basic structure of integrating the water heat exchanger of the refrigeration cycle circuit and the water heat exchanger of the water circuit is not changed, and pure refrigerant in the intermediate portion is not changed. Condensation temperature can be detected.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a circuit configuration of a heat pump water heater, which includes a refrigeration cycle circuit 1 and a water circuit 10.
In the refrigeration cycle circuit 1, a compressor 3, a four-way valve 4, a water heat exchanger 5, an expansion valve 6 as a pressure reducing device, and an air heat exchanger 7 are sequentially communicated via a refrigerant pipe 8. The refrigerant is conducted to perform a well-known refrigeration cycle operation.
[0017]
In the water circuit 10, a pump 12, a water heat exchanger 13, and a hot water storage tank 14 are sequentially communicated via a water pipe 15, so that water can be conducted to change into hot water and store hot water as described later.
[0018]
The water heat exchanger 5 of the refrigeration cycle circuit 1 and the water heat exchanger 13 of the water circuit 10 are integrated as described later to constitute a water heat exchanger K. The refrigerant and water guided to 13 exchange heat with each other.
[0019]
A discharge temperature sensor 20 for detecting the temperature of the refrigerant discharged from the compressor 3 is attached to the refrigerant pipe 8 in close contact with the refrigerant discharge portion of the compressor 3 of the refrigeration cycle circuit 1. A suction temperature sensor 21 for detecting the temperature of the refrigerant sucked into the compressor is attached to the refrigerant pipe 8 in close contact with the refrigerant suction portion of the compressor 3.
[0020]
A condensing temperature sensor 22 for detecting the condensing temperature of the refrigerant is attached in close contact with the water heat exchanger 5 of the refrigeration cycle circuit 1. The structure of the water heat exchanger 5 to which the condensation temperature sensor 22 is attached will be described later together with the structure of the water heat exchanger 13 of the water circuit 10.
[0021]
An evaporating temperature sensor 23 for detecting the evaporating temperature of the refrigerant is mounted in close contact with the refrigerant pipe 8 connecting the expansion valve 6 and the air heat exchanger 7. A water temperature sensor 24 for detecting the temperature of water is attached in close contact with the water pipe 15 near the suction part of the water circuit pump 12.
[0022]
Further, a hot water temperature sensor 25 for detecting the temperature of hot water heated by the water heat exchanger is attached in close contact with the water pipe 15 in the vicinity of the outlet of the water heat exchanger 13 in the water circuit 10.
[0023]
Each of the sensors 20 to 25 described above is electrically connected to a control device (control means) 30, and sends a detection signal from each sensor to the control device 30. The control device 30 sends a control signal to each electric component such as the compressor 3, the four-way valve 4, the expansion valve 6, and the pump 12, and can perform necessary control.
[0024]
The refrigerant used in the refrigeration cycle circuit 1 is the heat pump water heater configured as described above, and the R410A refrigerant or the R407C refrigerant is selected. For example, when midnight power is supplied during the midnight time zone, the water temperature sensor 24 detects the water temperature and sends a detection signal to the control device 30.
[0025]
Since the temperature detected by the water temperature sensor 24 is also the temperature of the hot water stored in the hot water storage tank 14, if the detected temperature is equal to or lower than a predetermined temperature, the control device 30 controls to start the heat pump hot water storage operation.
[0026]
The pump 12 of the water circuit 10 is driven to draw water from the hot water storage tank 14 and guide it to the water heat exchanger 13 as shown by the solid line arrow in the figure. On the other hand, the compressor 3 of the refrigeration cycle circuit 1 is driven, and the refrigerant is guided to the water heat exchanger 5 to be condensed as shown by a dashed arrow in the figure.
[0027]
The refrigerant condensing heat released from the water heat exchanger 5 of the refrigeration cycle circuit 1 is absorbed by the water passing through the water heat exchanger 13 of the water circuit 10, and the temperature rises and is converted to hot water. Hot water derived from the water heat exchanger 13 of the water circuit 10 accumulates in the upper portion of the hot water storage tank 14, and the amount of hot water increases with time and the amount of water in the lower portion decreases.
[0028]
The refrigerant condensed in the water heat exchanger 5 of the refrigeration cycle circuit 1 is guided to the expansion valve 6 to be decompressed, guided to the air heat exchanger 7 and evaporated, and is sucked into the compressor 3. Then, it is compressed and circulates again in the refrigeration cycle circuit 1 as described above.
[0029]
When the operation as described above is continued, the amount of hot water in the hot water storage tank 14 increases sequentially, and finally the entire tank is filled with hot water. In this state, as soon as the water temperature detected by water temperature sensor 24 becomes equal to or higher than the predetermined value and control device 30 receives the detection signal, control device 30 instructs to stop the hot water storage operation.
[0030]
Next, the water heat exchanger K, the water heat exchanger 5 of the refrigerant circuit 1 to which the condensing temperature sensor 22 constituting the water heat exchanger K is attached, the water heat exchanger 13 of the water circuit 10, and The flow of the refrigerant and the water in the above will be described with reference to FIGS.
2 is a schematic perspective view of the water heat exchanger K, FIG. 3 is a partial sectional view of the water heat exchangers 5, 13, and FIG. FIG. 5 is a diagram illustrating the flow of water, and FIG. 5 is a diagram illustrating a schematic configuration of the water heat exchangers 5 and 13 and illustrating a flow of a refrigerant and water.
[0031]
As shown in FIG. 2, the water heat exchanger K is mounted on an outdoor unit F that houses the compressor 3, the four-way valve 4, the air heat exchanger 7, the control device 30, and the like described above. .
[0032]
The water heat exchanger K has a pair of left and right coil assemblies 40 arranged and housed in parallel in a rectangular box-shaped housing (the upper surface is omitted) 26. Each coil assembly 40 is composed of a double coil body including an inner coil body 50 having an oval shape and an outer coil body 60 arranged at a predetermined interval outside the inner coil body.
[0033]
Each of the inner coil body 50 and the outer coil body 60 combines the water heat exchanger 5 of the refrigeration cycle circuit 1 and the water heat exchanger 13 of the water circuit 10. In other words, the water heat exchanger 5 of the refrigeration cycle circuit 1 and the water heat exchanger 13 of the water circuit 1 are combined in a coil shape.
[0034]
As shown in FIG. 3, each of the inner coil body 50 and the outer coil body 60 constituting each coil assembly 40 includes a refrigerant pipe 5P constituting the water heat exchanger 13 of the refrigeration cycle circuit 1 and a water circuit 1 The water pipes 13P as the water heat exchangers 13 are alternately stacked in the vertical direction.
[0035]
In other words, the water heat exchangers 5 and 13 are configured such that a relatively small-diameter refrigerant pipe 5P and a larger-diameter water pipe 13P have the same pitch diameter and a predetermined interval between the coils. It is wound in a shape.
[0036]
Then, the above-described inner coil body 50 or outer coil body 60 is formed by fitting the respective pipes into the respective coil spaces and fixing them by appropriate means such as brazing.
[0037]
The cross-sections of the completed inner coil body 50 and outer coil body 60 have a straight-line shape in which the refrigerant pipes 5P and the water pipes 13P are alternately overlapped. Since the pipes 5P and 13P are close to each other over the entire length of the coil, a heat exchange effect between the refrigerant and water can be obtained over the entire length.
[0038]
As shown in FIG. 4, in each coil assembly 40, the inner coil body 50 and the outer coil body 60 are connected by a refrigerant connection pipe PA shown by a broken line and a water connection pipe PB shown by a solid line. That is, the refrigerant connection pipe PA and the water connection pipe PB are connected such that the lowermost part of the inner coil body 50 and the uppermost part of the outer coil body 60 communicate with each other.
[0039]
Although each of the inner and outer coil bodies 50 and 60 has a state in which the 5P pipe for refrigerant and the pipe 13P for water are in close contact with each other over the entire length, the refrigerant connection pipe PA and the water connecting the coil bodies 50 and 60 mutually communicate. The connection pipes PB are separated from each other with a predetermined interval.
[0040]
In this embodiment, the description has been made on the assumption that two coil assemblies 40 are provided. However, depending on the specifications of the heat pump water heater, a larger number of coil assemblies 40 may be provided. .
[0041]
In any case, the coil assembly 40 is limited to the configuration described above. The condensing temperature sensor 22 is attached to only the refrigerant connection pipe PA of one coil assembly 40 regardless of the number of the coil assemblies 40.
[0042]
In particular, the refrigerant connection pipe PA is further separated upward from the upper part of the coil assembly 40, and the condensation temperature sensor 22 is attached to the separated portion. Thus, the condensation temperature sensor 22 is not affected not only by the heat of the water connection pipe PB but also by the heat of the coil assembly 40 itself.
[0043]
The refrigerant introduction part 70 in the coil assembly 40 is set at the uppermost part of the inner coil body 50. The refrigerant flows from the introduction portion 70 of the inner coil body 50 sequentially to the lower side, and the lowermost part of the inner coil body 50 becomes the inner outlet portion 71.
[0044]
On the other hand, an outer introduction portion 72 of the refrigerant is formed at the uppermost portion of the outer coil body 60, and communicates with the inner introduction portion 71 of the inner coil body 50 through the refrigerant connection pipe PA. In the outer coil body 60, the refrigerant flows sequentially to the lower side, and a refrigerant flow path is configured to communicate with the outlet 73 formed at the lowermost part.
[0045]
The water introduction section 75 in the coil assembly 40 is set at the lowermost portion of the outer coil body 60. In the outer coil body 60, the water sequentially flows to the upper side, and the uppermost portion becomes the outer lead-out portion 76.
[0046]
On the other hand, an inner introduction portion 77 of water is formed at the lowermost portion of the inner coil body 50, and this and the outer lead-out portion 76 of the outer coil body 60 communicate with each other via the water connection pipe PB. In the inner coil body 50, the water flows sequentially to the upper side, and a water flow path is formed so as to communicate with the outlet 78 formed at the uppermost part.
[0047]
From this, the direction of flow of the refrigerant in the refrigerant flow path and the direction of flow of the water in the water flow path in each coil assembly 40 are opposite to each other, and a so-called counterflow of the refrigerant and water is obtained.
[0048]
As shown in FIG. 5, in the coil assembly 40 arranged in parallel with each other, the refrigerant introduction part 70 and the refrigerant derivation part 73 of each coil assembly merge with each other to form the refrigeration cycle circuit 1 in the outdoor unit F. Is connected to a refrigerant pipe 8 forming a gas side pipe and a liquid side pipe through a packed valve (not shown).
[0049]
Further, each of the water introduction part 75 and the water derivation part 78 of each coil assembly 40 merges with each other and is connected to the water pipe 15 of the water circuit 10 via a packed valve (not shown).
[0050]
In particular, the pump 12 in the water circuit 10 is arranged on the outdoor unit F together with each coil assembly 40, and is connected to these junctions at a position near the water inlet 75 in the water flow path.
[0051]
Thus, by arranging the two coil assemblies 40 in parallel, the pressure loss of the entire pipe can be reduced, and the heat exchange efficiency can be improved.
The high-temperature refrigerant gas compressed by the compressor 3 is introduced from the upper end introduction part 70 of the water heat exchanger 5. On the other hand, water is introduced from the lower end introduction portion 75 of the water heat exchanger 13 and is heated in a counterflow with the refrigerant.
[0052]
While the water reaches the outlet section 78 of the water heat exchanger 13, the water is heated by the high-temperature refrigerant gas introduced into the water heat exchanger 5 to be heated to a high temperature. Immediately before being discharged from the lower end outlet portion 73 of the water heat exchanger 5, the refrigerant exchanges heat with water and exchanges heat with low-temperature water introduced into the water heat exchanger 13 to further lower the temperature, and immediately supercools. State.
[0053]
As shown in FIG. 1 again, the compressor 3 is of a variable rotational speed whose rotational speed is adjusted based on a control signal from a control device 30. Then, control device 30 controls the capacity of compressor 3 to control the temperature of hot water in hot water storage tank 14 to be kept constant.
[0054]
Specifically, the control device 30 receives the detected temperature signal from the hot water temperature sensor 25 provided on the water heat exchanger 13 outlet side of the water circuit 10, compares the detected temperature signal with a stored standard temperature, and Perform the operation changed to. Then, the obtained rotation speed control signal is sent to the compressor 3, and the rotation speed of the compressor is adjusted to control the detected temperature of the hot water temperature sensor 25 to the set hot water storage temperature.
[0055]
If the detected temperature of the hot water derived from the water heat exchanger 13 of the water circuit 10 is lower than the set value, the number of revolutions of the compressor 3 is increased to increase the heating capacity and increase the temperature of the hot water. Conversely, when the temperature of the hot water derived from the water heat exchanger 13 of the water circuit 10 is higher than the set value, the number of revolutions of the compressor 3 is reduced to lower the heating capacity, thereby reducing the temperature of the hot water.
[0056]
The pressure of the refrigeration cycle employing the R410A refrigerant and the R407C refrigerant is lower than that of the conventional refrigeration cycle employing the CO2 refrigerant. However, it is at the upper limit pressure level of the usage range of the compressor of a general household air conditioner. Therefore, high-pressure control as described below may be performed.
[0057]
That is, the condensing temperature sensor 22 detects an increase in the high pressure, and sends a signal to the control device 30. The control device 30 compares the value with the set value of the condensation temperature corresponding to the upper limit of the high pressure. When confirming that the value exceeds the upper limit, the control device 30 reduces the rotation speed of the compressor 3 and suppresses a further increase in the high pressure.
[0058]
Further, it is advantageous to control the pressure of the refrigerant gas discharged from the compressor 3 as high as possible and to control the discharged refrigerant at a high temperature in order to perform hot water supply. That is, by keeping the refrigerant discharge temperature of the compressor 3 high, the heated water is further heated by the high-temperature refrigerant gas immediately before being discharged from the water heat exchanger 13, and Is obtained.
[0059]
In this way, by performing the refrigeration cycle operation using the R410A refrigerant or the R407C refrigerant and performing control, the efficiency (COP) of the R410A refrigerant is better than that of the case of using the CO2 refrigerant, and is equivalent to that of the R407C refrigerant. .
[0060]
In terms of pressure, the R410A refrigerant has a high pressure of 4.75 MPa and the R407C refrigerant has a low pressure of 3.70 MPa, so that a high-temperature hot water storage of 85 ° C. can be performed at the current home air conditioner pressure level.
[0061]
In short, the hot water tank 14 stores high-temperature hot water that has risen to a predetermined temperature, and can always supply high-temperature hot water by opening the hot-water tap. Since hot water is obtained using midnight power, the running cost of hot water supply can be reduced.
[0062]
Since the coil assembly 40 has a double structure of the inner coil body 50 and the outer coil body 60, the large-capacity water heat exchangers 5 and 13 can be formed in a limited space, and a high hot water supply capacity is obtained. Can be
[0063]
Since the high-temperature refrigerant is guided from the inner coil body 50 to the outer coil body 60, and the water is guided from the outer coil body 60 to the inner coil body 50, a counterflow is configured, so that the high-temperature refrigerant and hot water are surrounded by the outer coil body 60. The heat loss that escapes to the outside air can be suppressed to a minimum, and a high-performance water heater can be provided.
[0064]
Then, a compressor, a heat exchanger, valves, and the like, which are refrigeration cycle components constituting the outdoor unit F of the current air conditioner, can be used as they are, and a low-cost water heater can be provided while maintaining low cost. .
[0065]
By maintaining the high temperature of the refrigerant gas discharged from the compressor 3, it is not necessary to increase the pressure of the discharged refrigerant more than necessary, and reasonable high-temperature heating becomes possible. By performing high-pressure control on the compressor 3, a refrigeration cycle operation is performed within a predetermined pressure range.
[0066]
The compressor 3 of the refrigeration cycle circuit 1 is not always a variable-speed compressor. In some cases, a compressor having a constant rotation speed is used so that control is not required and the control device can be simplified.
[0067]
FIG. 6 shows a circuit configuration of a heat pump water heater provided with a compressor 3H having a constant rotation speed. The same components as those described above with reference to FIG. 1 are denoted by the same reference numerals, and a new description will be omitted.
[0068]
Based on the above assumptions, the control device 30H, which is a control means in the water heater, can perform the following control.
That is, the rotation speed of the pump 12H disposed in the water circuit 10 is made variable, and a control signal of the rotation speed can be sent from the control device 30H. Then, the temperature of the hot water is detected by a hot water temperature sensor 25 provided on the water heat exchanger 13 outlet side of the water circuit 10, and the detection signal is sent to the control device 30H.
[0069]
The control device 30H performs necessary calculations based on the detection signal from the hot water temperature sensor 25, and sends a rotation speed control signal suitable for the pump 12H. That is, when the detected temperature of the hot water temperature sensor 25 is lower than the predetermined temperature, a control signal for lowering the rotation speed of the pump 12H is sent. As a result, the flow rate of the water circuit 10 decreases, and finally, the temperature of the hot water on the water heat exchanger 13 outlet side of the water circuit 10 increases.
[0070]
If the temperature detected by hot water temperature sensor 25 is higher than the predetermined temperature, control device 30H sends a control signal to increase the rotation speed of pump 12H. The flow rate of the water circuit 10 increases, and finally the temperature of the hot water at the water heat exchanger 13 outlet side of the water circuit 10 decreases. As a result, even if the compressor 3H having a constant rotation speed is used, the hot water storage temperature in the hot water storage tank 14 can be maintained at a predetermined temperature by performing adaptive control.
[0071]
Next, as the low pressure rise prevention control when the compressor 3H having the constant rotation speed is used, the rotation speed of the blower 9 arranged opposite to the air heat exchanger 7 is made variable, and the outside air temperature is detected. The controller 30H detects the temperature of the outside air temperature sensor 26 and controls the rotation speed of the blower 9.
[0072]
That is, when the outside air temperature is higher than the set value, the low pressure (evaporation pressure) increases and the input increases, so that the rotation speed of the blower 9 is reduced, the rise of the low pressure is suppressed, and the input is prevented from increasing.
[0073]
In addition, as the high pressure rise prevention control when the compressor 3H having the constant rotation speed is used, the rotation speed of the blower 9 arranged opposite to the air heat exchanger 7 is made variable, and the condensation temperature is detected. The condensing temperature sensor 22 is attached, and the control device 30H detects the temperature of the condensing temperature sensor 22 and controls the rotation speed of the blower 9.
[0074]
That is, when the condensing temperature is higher than the set value, the condensing pressure increases and the input increases, so that the rotation speed of the blower 9 is reduced and the evaporating pressure is suppressed from increasing, thereby preventing the increase in the condensing pressure. Also in this case, the condensation temperature of the refrigerant can be accurately detected, and high-pressure control can be accurately performed.
[0075]
The above-described control of the rotation speed of the pump 12H of the water circuit 10 and the control of the rotation speed of the blower 9 arranged to face the air heat exchanger 7 are also applied to a refrigeration cycle using a compressor having a variable rotation speed. Of course, it is possible.
[0076]
In the above-described embodiment, each coil assembly 40 has a double structure of the inner coil body 50 and the outer coil body 60. However, the present invention is not limited to this, and one of the coil bodies is arranged on the lower side. The other may be arranged on the upper side of the lower coil body, and the upper and lower coil bodies may be connected to each other by the refrigerant connection pipe PA and the water connection pipe PB.
[0077]
In addition, it goes without saying that the present invention can be implemented in various ways without departing from the scope of the invention, and all of them can be incorporated into the present invention.
[0078]
【The invention's effect】
As described above, according to the present invention, the water in the middle part is not changed while maintaining the basic structure of integrating the water heat exchanger of the refrigeration cycle circuit and the water heat exchanger of the water circuit, while reducing the cost. Thus, it is possible to detect the condensing temperature of the refrigerant without being affected by the heat, thereby improving the detection accuracy and the high-pressure control accuracy.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a heat pump water heater according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view of the water heat exchanger mounted on the outdoor unit, showing the embodiment.
FIG. 3 is a partial cross-sectional view of the water heat exchanger of the embodiment.
FIG. 4 is a diagram illustrating a state of conduction between a refrigerant and water, with a part of the coil assembly omitted in the embodiment.
FIG. 5 is a diagram schematically showing a circuit of a refrigerant and water of the water heat exchange device of the embodiment.
FIG. 6 is a circuit diagram of a heat pump water heater according to another embodiment of the present invention.
[Explanation of symbols]
3 ... Compressor, 5 ... Water heat exchanger (of refrigeration cycle circuit), 8 ... Refrigerant piping, 1 ... Refrigeration cycle circuit, 13 ... Water heat exchanger (of water circuit), 14 ... Hot storage tank, 5P ... For refrigerant Pipe, 13P: water pipe, 50: inner coil body, 60: outer coil body, PA: refrigerant connection pipe, PB: water connection pipe, 22: condensation temperature sensor, 30: control device (control means).

Claims (3)

  1. A compressor, a four-way valve, a water heat exchanger, a decompression device, and an air heat exchanger are sequentially communicated through a refrigerant pipe, and a refrigeration cycle circuit, and a pump, a water heat exchanger, and a hot water storage tank are sequentially communicated through a water pipe. A heat pump water heater comprising a communicating water circuit, wherein the heat of condensation discharged from the water heat exchanger of the refrigeration cycle circuit is absorbed by the water heat exchanger of the water circuit and hot water is stored in the hot water tank. ,
    The water heat exchanger used in the refrigeration cycle circuit and the water circuit has a plurality of coil bodies wound in a coil shape after alternately superimposing a refrigerant pipe through which refrigerant flows and a water pipe through which water flows. And a refrigerant connection pipe and a water connection pipe that mutually communicate the refrigerant pipe ends of these coil bodies and the water pipe ends.
    At least one set of the refrigerant connection pipe and the water connection pipe are separated from each other, and a condensation temperature sensor for detecting a temperature of the refrigerant is attached to the separated refrigerant connection pipe,
    A heat pump type water heater comprising a control means for performing high pressure control of a refrigeration cycle circuit when a temperature detected by the condensation temperature sensor exceeds a predetermined temperature.
  2. One of the coil bodies is an inner coil body, and the other of the coil bodies is an outer coil body formed at a predetermined interval outside the inner coil body. The heat pump water heater according to claim 1, wherein the refrigerant connection pipe and the water connection pipe communicate with each other.
  3. The refrigerant connection pipe and the water connection pipe are connected to communicate the lowermost part of the inner coil body and the uppermost part of the outer coil body,
    The refrigerant flow path is configured such that the refrigerant is introduced from the uppermost part of the inner coil body, guided from the lowermost part of the inner coil body to the uppermost part of the outer coil body via the refrigerant connection pipe, and further derived from the lowermost part of the outer coil body. And
    The water flow path was configured such that water was introduced from the lowermost part of the outer coil body, guided from the uppermost part of the outer coil body to the lowermost part of the inner coil body via a water connection pipe, and further derived from the uppermost part of the inner coil body. 3. The heat pump water heater according to claim 2, wherein:
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Cited By (12)

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JP2006078048A (en) * 2004-09-08 2006-03-23 Matsushita Electric Ind Co Ltd Heat pump heater
JP2006314503A (en) * 2005-05-12 2006-11-24 Matsushita Electric Ind Co Ltd Washing and drying machine
JP2007187366A (en) * 2006-01-12 2007-07-26 Matsushita Electric Ind Co Ltd Heat pump water heater
JP2008517247A (en) * 2004-10-20 2008-05-22 キャリア コーポレイションCarrier Corporation The shape of the gas cooler integrated in the heat pump chassis
JP2009180436A (en) * 2008-01-31 2009-08-13 Sharp Corp Heat exchanger and heat pump water heater
WO2009113881A1 (en) * 2008-03-10 2009-09-17 Matrix Engineering Limited Heat pump water heater
WO2010089957A1 (en) * 2009-02-05 2010-08-12 パナソニック株式会社 Heat exchanger
WO2015045116A1 (en) * 2013-09-27 2015-04-02 三菱電機株式会社 Refrigeration cycle device
CN105091640A (en) * 2015-09-10 2015-11-25 兰州兰石集团有限公司 Plate type heat exchange unit for domestic hot water
JP2015218959A (en) * 2014-05-19 2015-12-07 リンナイ株式会社 Heat pump heating device
KR20160041346A (en) 2014-10-07 2016-04-18 린나이코리아 주식회사 Water heat exchanger
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JP2006078048A (en) * 2004-09-08 2006-03-23 Matsushita Electric Ind Co Ltd Heat pump heater
JP4631365B2 (en) * 2004-09-08 2011-02-23 パナソニック株式会社 Heat pump heating device
JP2008517247A (en) * 2004-10-20 2008-05-22 キャリア コーポレイションCarrier Corporation The shape of the gas cooler integrated in the heat pump chassis
JP2006314503A (en) * 2005-05-12 2006-11-24 Matsushita Electric Ind Co Ltd Washing and drying machine
JP4552748B2 (en) * 2005-05-12 2010-09-29 パナソニック株式会社 Washing and drying machine
JP2007187366A (en) * 2006-01-12 2007-07-26 Matsushita Electric Ind Co Ltd Heat pump water heater
JP2009180436A (en) * 2008-01-31 2009-08-13 Sharp Corp Heat exchanger and heat pump water heater
WO2009113881A1 (en) * 2008-03-10 2009-09-17 Matrix Engineering Limited Heat pump water heater
WO2010089957A1 (en) * 2009-02-05 2010-08-12 パナソニック株式会社 Heat exchanger
US20110284193A1 (en) * 2009-02-05 2011-11-24 Panasonic Corporation Heat exchanger
JP5394405B2 (en) * 2009-02-05 2014-01-22 パナソニック株式会社 Heat exchanger
WO2015045116A1 (en) * 2013-09-27 2015-04-02 三菱電機株式会社 Refrigeration cycle device
JPWO2015045116A1 (en) * 2013-09-27 2017-03-02 三菱電機株式会社 Refrigeration cycle equipment
EP3051224A4 (en) * 2013-09-27 2017-05-31 Mitsubishi Electric Corporation Refrigeration cycle device
JP2015218959A (en) * 2014-05-19 2015-12-07 リンナイ株式会社 Heat pump heating device
KR20160041346A (en) 2014-10-07 2016-04-18 린나이코리아 주식회사 Water heat exchanger
KR101633558B1 (en) * 2014-10-07 2016-06-24 린나이코리아 주식회사 Water heat exchanger
CN105091640B (en) * 2015-09-10 2017-03-01 兰州兰石集团有限公司 A kind of domestic hot-water's plate-type heat-exchange unit
CN105091640A (en) * 2015-09-10 2015-11-25 兰州兰石集团有限公司 Plate type heat exchange unit for domestic hot water
CN106369874A (en) * 2016-08-27 2017-02-01 重庆鸿佳新科技有限公司 Ice source heat pump system

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