JP2011102660A - Method of determining boiling-up set temperature for heat pump storage type hot water supplying/heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of determining an optimum boiling-up set temperature in a heat pump storage type hot water supplying/heating device executing 24-hour heating. <P>SOLUTION: In this heat pump storage type hot water supplying/heating device which includes a hot water storage tank 1 for storing hot water/water, a heat pump type heating means 4 for heating hot water/water in the hot water storage tank 1, and a heating circuit 15 performing a heating operation by applying the hot water/water in the hot water storage tank 1 as a heat source, and in which the hot water/water in the hot water storage tank 1 is boiled up by operating the heat pump type heating means 4 in a late-night time zone, and the hot water/water in the hot water storage tank 1 is reheated by operating the heat pump type heating means 4 when a heat accumulation amount in the hot water storage tank 1 becomes insufficient in a daytime zone, in a case when the hot water storage tank 1 is not kept in an approximately full state at the termination of the late-night time zone, the next boiling-up set temperature is lowered, and in a case when a time of the reheating operation in the daytime zone is more than a prescribed time, the next boiling-up set temperature is raised. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for determining a boiling set temperature of a hot-pump hot-water hot water supply / heating device that uses hot water heated by a heat pump-type heating means as a hot water storage hot water and a heat source for heating.

  Conventionally, in this type of heat pump hot water storage type hot water supply device, the heat amount of the hot water supply and the heat amount of the heating amount are heated by the heat pump type heating means in the midnight hours when the unit price of electricity is low, and stored in the hot water storage tank. When the amount of stored heat is insufficient, the heat pump type heating means is operated even in the daytime period to increase the amount of heat and store heat in the hot water storage tank.

  And if there is a daytime boiling increase, raise the boiling temperature setting of the hot water to be heated in the next midnight time period to increase the heat storage amount in the midnight time period, and increase the heating capacity in the daytime period. I was trying not to do it.

JP 2003-14303 A

  By the way, in this conventional thing, when heating operation is performed continuously for 24 hours or more for a long time, during the midnight time zone, the boiling operation is performed by the heat pump type heating means, and hot water storage and heating are performed. If the amount of heat stored in the system is insufficient, the amount of heat is increased during the daytime hours and compensated for by driving.

  Then, when the heating setting temperature in the next midnight time zone is raised by performing the heating operation during the daytime time zone, as shown in FIG. 3, the boiling target heat storage amount at the end time of the midnight time zone is Although the heating target heat storage amount A increases from the boiling target heat storage amount A to the boiling target heat storage amount B, the heating capacity of the heat pump type heating means does not change. Since the amount has not changed, it does not lead to a decrease in operating time due to increased boiling during the daytime.

  Furthermore, since the COP (heating efficiency) of the heat pump heating means is deteriorated by the increase in the boiling preset temperature, the amount of electricity used is increased and the running cost is deteriorated.

  In order to solve the above-described problems, the present invention provides a hot water storage tank for storing hot water, a heat pump heating means for heating the hot water in the hot water storage tank, a heating circuit for performing a heating operation using the hot water in the hot water storage tank as a heat source, The heat pump heating means is operated at midnight to boil the hot water in the hot water storage tank, and the heat pump heating means is operated to operate in the hot water storage tank when the amount of heat stored in the hot water storage tank is insufficient during the daytime time. If the inside of the hot water storage tank is not nearly full at the end time of the midnight time zone, the next boiling set temperature is lowered to increase the daytime time zone. When the operation time is longer than a predetermined time, the next boiling set temperature is increased.

  As described above, according to the present invention, even when the continuous heating operation is performed for 24 hours, the boiling setting temperature is not set to a high temperature carelessly, and an appropriate boiling setting temperature is set. In addition, it is possible to perform an efficient boiling operation with high COP and to reduce the running cost.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the heat pump hot water storage type hot water supply and heating apparatus of one Embodiment of this invention. The flowchart figure which shows the determination method of the boiling preset temperature of the same embodiment. The time chart for demonstrating the action | operation of the past and this invention.

One embodiment of the heat pump hot water storage type hot water supply and heating apparatus of the present invention will be described with reference to FIG.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe connected to the lower part of the hot water storage tank 1, 3 is a hot water supply pipe connected to the upper part of the hot water storage tank 1, and 4 is a heat pump type for heating the hot water in the hot water storage tank 1. Heating means 5 is a heat pump circulation circuit that connects the hot water tank 1 lower part, the heat pump type heating means 4 and the hot water tank 1 upper part so that hot water in the hot water tank 1 can be circulated, and 6 is a heat pump provided in the middle of the heat pump circulation circuit 5. It is a circulation pump. Moreover, although not shown in figure, the hot water filling circuit branched from the hot water supply pipe | tube 3 to the bathtub is provided.

  The heat pump heating means 4 includes a compressor 7 for compressing refrigerant, a water heat exchanger 8 for radiating heat from the high-temperature and high-pressure refrigerant to the hot water in the hot water storage tank 1, an expansion valve 9 for decompressing the refrigerant, and a low-temperature and low-pressure refrigerant as air. The air heat exchanger 10 that evaporates by heat exchange is connected in a ring shape.

  Next, 11 is a heating heat exchanger for heating the circulating fluid for heating on the secondary side with hot water in the hot water storage tank 1, and 12 is for circulating the hot water in the hot water storage tank 1 to the heating heat exchanger 11. A heat storage circuit, 13 is a primary side heating pump provided in the middle of the heat storage circuit 12, 14 is a hot water heating terminal such as a hot water floor heating panel, and 15 is a secondary side of the heating heat exchanger 11 and a hot water heating terminal. A secondary side circulation circuit 16 for connecting the circulating fluid for heating to the vessel 14 so as to circulate, and 16 is a secondary side heating pump provided in the middle of the secondary side circulation circuit, and these constitute a heating circuit.

  A plurality of hot water storage temperature sensors 17 are provided on the upper and lower sides of the hot water storage tank 1, and 18 is a control device that controls the operation of the device by performing a predetermined calculation based on the output of each sensor. The amount of stored hot water or the amount of stored hot water in the hot water storage tank 1 is detected by a combination with capacity information given in advance.

Next, the operation of this embodiment will be described.
At midnight, the heat pump heating means 4 and the heat pump circulation pump 6 are operated until the next morning, and the low temperature hot water taken out from the lower part of the hot water storage tank 1 is heated to a predetermined high temperature by the water heat exchanger 8. Then, the heating operation is performed so as to return to the upper part of the hot water storage tank 1 and to heat up the heat amount corresponding to the predicted amount of hot water supply and heating of the next day.

  When the faucet provided at the end of the hot water supply pipe 3 is opened, city water is supplied from the water supply pipe 2 below the hot water storage tank 1 into the hot water storage tank 1, and hot water is supplied from the hot water supply pipe 3 above the hot water storage tank 1. Hot water is supplied.

  Next, the heating operation will be described. When a large amount of heating heat is secured in the hot water storage tank 1 such as immediately after the start of the daytime period, if there is a heating request, the primary side circulation pump 13 And the secondary side circulation pump 16 are driven to circulate the high temperature water in the upper part of the hot water storage tank 1 to the primary side of the heating heat exchanger 11 to dissipate heat to the secondary side and to the lower part of the hot water storage tank 1 On the other hand, on the secondary side, hot water heated by the heating heat exchanger 11 circulates to the hot water heating terminal 14 and radiates heat in the heated space, and then returns to the heating heat exchanger 11 again. Heating operation is performed by being heated. Thus, the operation | movement which heats using only the calorie | heat amount of the hot water boiled in the midnight time zone and is stored in the hot water storage tank 1 is called a warm storage operation.

  Then, when there is a heating request in a state where the amount of heat in the hot water storage tank 1 is reduced by the heat storage operation and the hot water supply operation, the primary side circulation pump 13 and the secondary side circulation pump 16 are driven, High-temperature water is circulated to the primary side of the heating heat exchanger 11 to dissipate heat to the secondary side and return to the lower part of the hot water storage tank 1 via the heat storage circuit 12, while on the secondary side, the heating heat exchanger The hot water heated at 11 circulates to the hot water heating terminal 14 and dissipates heat in the heated space, and then returns to the heating heat exchanger 11 to be heated again for heating operation and at the same time during the daytime. However, the heat pump heating means 4 and the heat pump circulation pump 6 are operated, and the low-temperature hot water taken out from the lower part of the hot water storage tank 1 is heated to a predetermined high temperature by the water heat exchanger 8 to the upper part of the hot water storage tank 1. Bring it back to perform boiling operationThereby, the high temperature water heated and stored by the heat pump type heating means 4 can be used immediately for heating, and the heating operation can be performed even when the amount of stored hot water in the hot water storage tank 1 is small. Here, the heat pump type heating means 4 is selected to have a heating capacity larger than the heating load at the time of stabilization, and it is possible to increase the amount of stored hot water while performing the heating operation. The operation in which the boiling operation is performed simultaneously with the heat storage operation in this way is referred to as hot water storage heat storage operation.

  In the present invention, the heating operation is performed continuously for 24 hours or close to it. In the midnight time zone where the unit price of electricity is low, the hot water heated by the heat pump heating means 4 is used for heating, and in the daytime time zone. Is to supply hot water and heating as much as possible with hot water boiled in the midnight hours, and when it is judged that the amount of stored hot water is insufficient, the hot water heated by the heat pump heating means 4 using the electric power in the daytime hours is used for heating It is intended to be used.

  Here, the control device 18 is configured to switch between the warming-up operation and the hot-water storage / heating operation based on the amount of stored hot water in the hot-water storage tank 1, and will be described based on FIG. The condition for switching from the heat storage operation state to the heat storage operation state is that when the amount of stored hot water Qd equal to or higher than a first predetermined temperature Td (eg, 60 ° C.) that can be used as a heating heat source is equal to or higher than the first predetermined amount Q1, The operation of the circulation pump 6 is stopped and the hot water storage / storage operation is switched to the storage operation.

  Next, a method of determining the boiling set temperature that is heated by the heat pump heating means 4 will be described based on the flowchart of FIG. In addition, the boiling preset temperature is prepared in a plurality of stages in increments of 5 ° C. in the range of 65 ° C. to 90 ° C.

  First, at the start time of the midnight time zone, the control device 18 starts up a boiling set temperature determination program. In this boiling temperature setting program, it is first determined whether or not the hot water at the boiling temperature has been fully heated in the hot water storage tank 1 by the end time of the midnight time zone of the previous day (step 1). If the tank is not full (No in Step 1), the boiling set temperature is lowered by one step from that of the previous day (Step 2).

  If hot water at the set temperature has been fully boiled in the hot water storage tank 1 by the end time of the midnight time zone in step 1 (Yes in step 1), the daytime of the previous day in the next step 3 In order to compensate for the shortage of heat in the hot water storage tank 1 in the belt, it is determined whether or not a reheating operation for boiling the hot water at the set temperature is performed by the heat pump heating means 4. When the boiling increase operation is not performed (No in Step 3), the boiling set temperature is lowered by one step from that of the previous day (Step 2).

  In the case where the heating operation is performed during the daytime in Step 3 (Yes in Step 3), it is determined whether the time during which the heating operation is performed is equal to or longer than a predetermined time (Step 4). If the boiling operation time is longer than the predetermined time (Yes in step 4), the boiling setting temperature is raised by one step from that of the previous day (step 5), and the boiling operation time is less than the predetermined time. If it is (No in Step 4), the heating setting temperature of the previous day is maintained (Step 6).

  Thus, a hot water storage tank for storing hot water, a heat pump heating means for heating the hot water in the hot water storage tank, a heating circuit for performing a heating operation using the hot water in the hot water storage tank as a heat source, and the heat pump at midnight When the hot water in the hot water storage tank is boiled by operating the hot water heating means, and the heat storage amount in the hot water storage tank is insufficient during the daytime, the heat pump heating means is operated to increase the hot water in the hot water storage tank. In the case where the hot water storage tank is not substantially full at the end time of the midnight time zone, the next boiling set temperature is lowered and the heating time of the daytime zone is increased for a predetermined time. In the above case, since the next boiling set temperature is increased, the boiling set temperature is inadvertently set even if the continuous heating operation is performed for 24 hours. Without being set to have a temperature, set temperature setting boiling appropriate, together perform the heating operation good high COP efficiency, it can reduce the running cost.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 4 Heat pump type heating means 15 Heating circuit

Claims (1)

  A hot water storage tank for storing hot water, a heat pump heating means for heating the hot water in the hot water storage tank, a heating circuit for performing a heating operation using the hot water in the hot water storage tank as a heat source, and the heat pump heating means for midnight In operation, the hot water in the hot water storage tank is boiled, and when the heat storage amount in the hot water storage tank is insufficient during the daytime, the heat pump type heating means is operated to increase the hot water in the hot water storage tank. If the hot water storage tank is not nearly full at the end time of the midnight time zone, the next boiling set temperature is lowered, and if the heating time of the daytime zone is longer than the predetermined time, The method for determining the heating preset temperature of the heat pump hot water storage type hot water supply and heating device, characterized in that the next boiling preset temperature is increased. .

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