JP2011220621A - Heat pump type hot water heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical heat pump type hot water heating device by suppressing temperature of supplied hot water as much as possible while keeping set temperature desired by a user.SOLUTION: A water heat medium from a heat source machine 1 is circulated in a radiator 7 by driving of a circulation pump 12 to carry out heating. A going pipe 8 and a return pipe 9 connecting a refrigerant water heat exchanger 5 and the radiator 7 respectively include a going temperature sensor 10 for detecting going temperature of the water heat medium and a return temperature sensor 11 for detecting return temperature of the water heat medium. Further, the hot water heating device includes a control part 17 for controlling the heat source machine 1 to keep the return temperature from the radiator 7 at set temperature by a remote controller 13. After the return temperature becomes the set temperature and is stabilized, the control part 17 stores difference between the going/return temperatures during the stabilization, makes the return temperature automatically shift to the low-temperature side, and gradually decreases the return temperature while checking if the temperature difference at this time corresponds to the stored temperature difference, which can save energy and can improve COP.

Description

  The present invention provides an economical heat pump type hot water heating apparatus that improves the COP (heating capacity / input) by heating by reducing the return temperature as much as possible in hot water heating using a heat pump cycle.

  Conventionally, in this type of hot water heating apparatus, although it is not a heat pump cycle, high temperature water is continuously supplied at a return temperature difference> 10 ° C., 10 ° C.> low temperature water is continuously supplied at a return temperature difference> 5 ° C., 5 ° C.> By controlling the heating operation under these three conditions by intermittently supplying low-temperature water with the difference between the return and return temperatures, the floor temperature is estimated from the difference between the return and return temperatures, and appropriate heating is performed according to the actual bed temperature. It was something that could be done. (For example, refer to Patent Document 1.)

Japanese Patent No. 3753566

  By the way, with this conventional device, the temperature is controlled based on the difference between the return and return temperatures regardless of the temperature desired by the user, the return and return temperatures, and the user cannot set the heating temperature freely. Both the return and return temperatures inevitably move only to the high temperature side, resulting in excessive heating, wasteful energy and uneconomical, and the return temperature also becomes high, so that the heat source becomes abnormal in the heat pump cycle, COP decreases, etc. It had the subject of.

  In order to solve the above-mentioned problems, the present invention is configured in particular in claim 1 as a heat source device including a refrigerant water heat exchanger for exchanging heat between a refrigerant heated by a heat pump cycle and a hydrothermal medium, and the heat source. In a heat pump type hot water heating apparatus that heats by circulating a water heat medium from a heater to a radiator by driving a circulation pump, an outgoing pipe and a return pipe that connect the refrigerant water heat exchanger and the radiator are Each has a forward temperature sensor that detects the forward temperature of the water heat medium and a return temperature sensor that detects the return temperature of the water heat medium, and further maintains the return temperature from the radiator at a temperature set by the remote controller. A control unit that controls the heat source device, and the control unit stores the difference between the return temperature at the time of stabilization after the return temperature becomes stable and automatically moves the return temperature to the low temperature side, The temperature difference at this time is the memory It was while making sure it matches the temperature difference, in which the return temperature was set to reduce stepwise.

  According to a second aspect of the present invention, the controller controls the heat source device when the return temperature difference when the return temperature is automatically lowered to the low temperature side, and the stored temperature difference is small. The return temperature is corrected to the high temperature side.

  According to claim 1 of the present invention, the heat source device is controlled so that the return temperature of the radiator becomes the set temperature selected by the user himself, and after this temperature is stabilized, the difference between the return temperature difference at this time and While confirming that they match, the return temperature automatically shifts to the low temperature side step by step, so the heat dissipation temperature in the radiator does not change significantly from the user's set temperature, preventing overheating and extremely economical Moreover, the return temperature is low and the COP can be improved.

  According to claim 2, when the return temperature difference becomes smaller due to the movement of the return temperature to the low temperature side, the return temperature is corrected to the high temperature side, so that the heat dissipation temperature at the radiator decreases. Sometimes it can be quickly returned to its original state, never used while the heat dissipation temperature is lowered, and it is possible to realize energy saving with suitable heating by keeping the heat dissipation temperature low and keeping the return temperature low. .

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the heat pump type hot water heating apparatus of one Embodiment of this invention. Explanatory drawing of the operating state of the heating operation. The flowchart of the heating operation.

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a heat pump heat source that generates a water heating medium for heating, an air heat exchanger 2 that collects heat from outside air, an outdoor fan 3 that blows outside air to the air heat exchanger 2, and heat. In a heat pump cycle comprising a compressor 4 for compressing a refrigerant to be conveyed, a refrigerant water heat exchanger 5 for exchanging heat between a high-temperature and high-pressure refrigerant and a hydrothermal medium comprising antifreeze, and an expansion valve 6 for adjusting the flow rate of the refrigerant. It is configured.

  Reference numeral 7 denotes a radiator for heating by circulating a hydrothermal medium heated to a high temperature by the heat source 1 through a pipe (not shown) laid on the floor. The refrigerant water heat exchanger 5 is a high-temperature water. The forward pipe 8 for circulating the heat medium to the radiator 7 and the return pipe 9 for circulating the water heat medium whose temperature has been lowered by the radiator 7 to the refrigerant water heat exchanger 5 constitute a hot water heating circuit. is there.

  The forward pipe 8 is provided with a forward temperature sensor 10 for detecting the temperature of the water heat medium toward the radiator 7, and a return pipe for returning the water heat medium from the radiator 7 to the refrigerant water heat exchanger 5. 9 is provided with a return temperature sensor 11 for detecting the temperature of the hydrothermal medium after heat radiation by the radiator 7 and a circulation pump 12 for circulating the hydrothermal medium.

  Reference numeral 13 denotes a remote controller for various settings provided in the vicinity of the radiator 7. By operating the setting switch 16 while viewing the weak / medium / strong bar display 15 displayed on the display unit 14, the target return The temperature can be set as desired by the user, and it can be set in steps of 2 ° C. from a weak 20 ° C. to a medium 40 ° C. and a strong 60 ° C.

  Reference numeral 17 denotes a control unit composed of a microcomputer, which inputs the return temperature of the water heat medium detected by the return temperature sensor 10 and the return temperature of the water heat medium detected by the return temperature sensor 11 as needed, and is further set by the remote controller 13. The set return temperature is inputted and stored, and the output temperature is adjusted so that the return temperature detected by the return temperature sensor 11 becomes the set temperature, and the capacity of the compressor 4 or the opening degree of the expansion valve 6 is adjusted to adjust the heat source 1. By varying the heating capacity, the temperature is maintained at the set temperature, and the temperature difference between the return temperature and the return temperature is calculated and stored in a stable period of several tens of seconds where the set temperature and the return temperature coincide with each other. The temperature of the heat source device 1 is also lowered so that the temperature is lowered to several degrees on the low temperature side, and the temperature difference between the return temperature and the return temperature at this time is calculated. Reduce the return temperature and repeat the same If the long as the temperature difference becomes small, the control to say the temperature back to increase the capacity of the heat source unit 1 is corrected to the high temperature side, it is obtained by the repeated sequentially.

Next, the operation of this embodiment will be described with reference to the explanatory diagram of FIG. 2 and the flowchart shown in FIG. (When temperature is constant and circulation pump 12 flow rate is constant)
If the user sets the set temperature to 30 ° C. with the remote controller 13 now, the heat source 1 is driven and the heating of the water heat medium in the refrigerant water heat exchanger 5 is detected by the temperature sensor 11 after the heat from the radiator 7 is released. The return temperature is controlled to be 30 ° C., and it is confirmed in step 18 that the return temperature has reached the set temperature 30 ° C., and the process proceeds to step 19 in YES, and the temperature difference A between the forward temperature and the return temperature is determined. In this case, after storing 10 ° C., the routine proceeds to step 20 where a stable period of 20 seconds is counted.

  Next, in step 21, the return temperature is moved to the low temperature side, and the heat source 1 is controlled so that the capacity of the compressor 4 is lowered so that the return temperature is 28 ° C., which is 2 ° C., and the return temperature is confirmed in step 22 Then, the process proceeds to step 23 with YES, and the temperature difference B between the return temperature and the return temperature is measured. Here, since the return temperature is 38 ° C., the temperature difference B becomes 10 ° C. The current temperature difference B is compared with the current temperature difference B, and it is confirmed that the temperature difference A is equal to the temperature difference B with no change, and the process proceeds to step 25 where a predetermined time, here 10 seconds, is counted. The movement of the temperature to the low temperature side is further continued.

  After the predetermined time is counted in step 25, the process proceeds to step 26 with YES, the return temperature is moved to the low temperature side, and the compressor 4 is controlled to be 26 ° C., which is 2 ° C. lower. In step 27, the return temperature is controlled. After confirming 26 ° C., the process proceeds to step 28 with YES, and the temperature difference C between the return temperature and the return temperature is measured. Here, the temperature difference C is 8 ° C. because the return temperature is 34 ° C. Comparing the temperature difference A with the current temperature difference C, the current temperature difference C becomes smaller when the temperature difference A> the temperature difference C, so that the process proceeds to step 30 and the movement control of the temperature to the low temperature side is temporarily stopped. The correction control to the high temperature side for returning the return temperature to the original is performed.

  Therefore, in step 31, the heat source 1 is controlled so as to increase the capacity of the compressor 4 so that the return temperature is moved to the high temperature side and returned to 28 ° C., which is 2 ° C. higher. In step 32, the return temperature 28 ° C. is confirmed. Then, the process proceeds to step 33 with YES, and the temperature difference D between the return temperature and the return temperature is measured. Here, since the return temperature is 38 ° C., the temperature difference D becomes 10 ° C. The temperature difference D is compared, and it is confirmed that the temperature difference coincides with the temperature difference A = temperature difference D, and the process proceeds to step 35, where a predetermined time, here 10 seconds is counted, and the return temperature is moved again to the low temperature side. Is continued until the hot water heating operation is completed.

  In step 28, the temperature difference C between the return temperature and the return temperature is smaller than the temperature difference A at the time of stabilization. The forward temperature of 34 ° C. is the limit temperature.

  In this way, by moving the return temperature stepwise to the low temperature side on the condition that the temperature difference between the return temperature and return temperature is kept around the set temperature desired by the user, It is very economical because it can save energy by reducing the capacity of the heat source 1 as much as possible without leaving the temperature so much. Moreover, the COP is improved by lowering the return temperature. A hot water heater can be provided.

DESCRIPTION OF SYMBOLS 1 Heat source device 5 Refrigerant water heat exchanger 7 Radiator 8 Outward pipe 9 Return pipe 10 Outbound temperature sensor 11 Return temperature sensor 12 Circulation pump 13 Remote control 17 Control part

Claims (2)

  A heat source device including a refrigerant water heat exchanger that exchanges heat between the refrigerant heated by the heat pump cycle and the water heat medium, and heating the water heat medium by circulating the water heat medium from the heat source device to the radiator by driving the circulation pump. In the heat pump type hot water heating apparatus that performs the above, the forward pipe and the return pipe that connect the refrigerant water heat exchanger and the radiator are respectively provided with an outgoing temperature sensor that detects an outgoing temperature of the water heat medium, and a water heat medium. A return temperature sensor for detecting the return temperature, and a control unit for controlling the heat source device so as to hold the return temperature from the radiator at a set temperature by a remote controller. After stabilization, the return temperature difference at the time of stabilization is memorized, and the return temperature is automatically moved to the low temperature side while checking whether the temperature difference at this time matches the memorized temperature difference. Lower the return temperature step by step The heat pump type hot-water heating system, characterized in that the so as to.   When the return temperature difference when the return temperature is automatically lowered to the low temperature side is smaller than the stored temperature difference, the control unit controls the heat source device to bring the return temperature to the high temperature side. The heat pump type hot water heating apparatus according to claim 1, wherein correction is made.

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