JP2013152049A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater that performs fall-in hot water filling while taking a heat dissipation loss into consideration.SOLUTION: A storage type water heater comprises: a water feed pipe 7 which communicates with the bottom of a hot water storage tank 2 and feeds water; a mixing valve 10 which mixes high-temperature water from a hot water feed-out pipe 8 and low-temperature water from a water feed bypass pipe 9 branched from the water feed pipe 7; a hot water feed pipe 11 which feeds the mixed hot water mixed by the mixing valve 10 from a tap 12 of a terminal, and makes the mixed hot water directly fall into a bath tub 13 to fill the bath tub; a hot water temperature sensor 14 for detecting a hot water temperature; a hot water flow sensor 15 for counting a hot water feed quantity; and a hot water storage control means 17 which controls the mixing valve 10 so as to reach a target set temperature which is set at the fall-in hot water filling to the bath tub 13, and notifies a stop of the hot water filling when the hot water quantity reaches a target hot water filling quantity. After performing corrective hot water filling for filling hot water so that the target set temperature becomes high and a prescribed quantity becomes large as an outside air temperature detected by an outside air temperature sensor 30 for detecting an outside air temperature becomes low, the hot water storage control means 17 returns again the hot water filling to original hot water filling at the target set temperature.

Description

  The present invention relates to a hot water storage type hot water supply apparatus that performs hot water filling in which hot water is dropped directly from a faucet into a bathtub.

  Conventionally, in this kind of thing, when the winter season is judged, after half of the water is filled with a temperature higher than the bath setting temperature, the rest is filled with the bath setting temperature, and the boiling temperature is set to the bath setting. The temperature was not exceeded.

Japanese Patent No. 3895534

  By the way, in this conventional product, the heat dissipation loss due to the outside air temperature varies depending on the outside air temperature, so if roughly controlled, the boiling temperature fluctuates greatly whether it is higher or lower than the set temperature, and the set temperature rises. It must not have been.

  The present invention focuses on this point and solves the above-described problems. In particular, in claim 1, the structure is particularly configured as a hot water storage tank for storing hot water heated by the heating means and an upper portion of the hot water storage tank for discharging hot water. And a mixing valve for mixing the hot water from the hot water pipe and the cold water from the water supply bypass pipe branched from the water supply pipe, the mixing valve A hot water supply pipe that performs hot water filling that directly mixes the mixed water from the faucet of the terminal into the hot water and the bathtub, a hot water temperature sensor that detects the hot water temperature, a hot water flow rate sensor that counts the amount of hot water, and a drop into the bathtub A hot water storage control means for controlling the mixing valve so as to reach a set target set temperature when hot water filling is performed, and hot water storage control means for notifying of hot water filling stop when the target hot water filling amount is reached. Means outside temperature The lower the outside air temperature detected by the outside air temperature sensor, the higher the target set temperature and the higher the predetermined amount. .

  According to a second aspect of the present invention, the correction hot water filling is performed at the beginning of the hot water filling.

  According to the first aspect of the present invention, the target set temperature is changed according to the outside air temperature, and the correction hot water filling is also performed to change the amount of hot water filling at the changed target set temperature. In the end, the target set temperature is dropped and hot water filling is performed, and good hot water supply is always performed with peace of mind.

  According to claim 2, since the correction hot water filling is performed at the beginning of the hot water filling, hot water having a high temperature is located on the lower side of the bathtub, and hot water having a lower temperature is placed on the hot water. Thus, convection of hot water occurs in the bathtub and a uniform hot water temperature can be obtained.

The schematic block diagram of one Embodiment of this invention. The principal part block diagram of the same embodiment. The flowchart for demonstrating operation | movement of the same embodiment.

Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot water storage tank unit containing a hot water storage tank 2 for storing hot water, 3 denotes a heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, and 4 denotes a forward pipe 5 connected to the lower part of the hot water storage tank 2 and hot water storage. A circulation circuit comprising a return pipe 6 connected to the upper part of the tank 2, 7 a water supply pipe connected to the lower part of the hot water storage tank 2 to supply water to the hot water storage tank 2, and 8 connected to the upper part of the hot water storage tank 2 to store hot water. It is a tapping pipe that pours hot water.

  9 is a water supply bypass pipe branched from the water supply pipe 7, 10 is a mixing valve that mixes high-temperature water from the hot water discharge pipe 8 and water supply from the water supply bypass pipe 9 to make hot water at a target set temperature, and 11 is a mixing valve 10. A hot water supply pipe for performing hot water filling in which the mixed water mixed in step 1 is dropped directly from the faucet 12 of the terminal into the hot water and bathtub 13, 14 is a hot water supply temperature sensor which is attached to the hot water supply pipe 11 and detects the hot water temperature after mixing by the mixing valve 10, Reference numeral 15 denotes a hot water flow rate sensor that is attached to the hot water supply pipe 11 and counts the amount of hot water supply, 16 is a plurality of hot water storage temperature sensors that detect the temperature of the hot water in the hot water storage tank 2, and 17 is a hot water storage tank unit. 1 is a hot water storage control means for receiving the output of each sensor in 1 and controlling the operation of each actuator.

  The hot water storage control means 17 predicts the hot water supply amount of the next day from the actual use of hot water such as the maximum value and average value of the hot water supply for the past several days, and sets the boiling target temperature to 65 so that the predicted hot water supply amount can be secured. The heat pump unit 3 is determined in the range from 0 ° C. to 90 ° C., and the hot water in the hot water storage tank 2 reaches a predetermined boiling target temperature when the unit price of the contracted electric power by time zone is an inexpensive midnight time zone. The hot water storage control means 17 instructs the heat pump unit 3 to give a boiling operation start command, and the hot water storage control means 17 sets the hot water supply temperature of the bath remote controller 18 when the hot water is poured into the bathtub 13 by the drop switch AON of the bath remote controller 18. The mixing valve 10 is controlled by the temperature detected by the hot water supply temperature sensor 14 so that the target set temperature set by the temperature setting means 19 is reached, and the hot water supply flow rate sensor 15 is Hot water filling amount darken to cement is intended to operate the alarm means 20 in detection of the full amount 200L tub 13 which is set in advance.

  The heat pump unit 3 includes a compressor 21 having a variable rotation speed for compressing refrigerant, a water refrigerant heat exchanger 22 for exchanging heat between the high-temperature and high-pressure refrigerant and hot water in the hot water storage tank 2, and a water refrigerant heat exchanger 22 passage. A heat pump circuit 25 in which an expansion valve 23 as a pressure reducer for reducing the pressure of the subsequent refrigerant and an air heat exchanger 24 as an evaporator for evaporating the low-temperature and low-pressure refrigerant from the expansion valve 23 are connected in an annular shape by refrigerant piping; The outdoor fan 26 that blows air to the air heat exchanger 24, the water side of the water-refrigerant heat exchanger 22, and the hot water storage tank 2 are provided in the circulation circuit 4 that is connected in a ring shape with hot water piping, and the hot water in the hot water storage tank 2 is circulated. And a circulation pump 27 having a variable rotation speed.

  A discharge temperature sensor 28 is provided in a refrigerant pipe between the compressor 21 and the water refrigerant heat exchanger 22 and detects discharge temperature of the refrigerant discharged from the compressor 21. 29 is a water refrigerant. A refrigerant outlet temperature sensor 30 provided as a refrigerant outlet temperature detecting means provided in a refrigerant pipe between the heat exchanger 22 and the expansion valve 23 and detecting an outlet temperature of the refrigerant after heat exchange with the water refrigerant heat exchanger 22; Is provided on the air inlet side of the air heat exchanger 24 and is an outside air temperature sensor as an outside air temperature detecting means for detecting the outside air temperature, and 31 flows into the water side of the water refrigerant heat exchanger 22, and the water refrigerant heat exchanger 22 An incoming water temperature sensor 32 serving as an incoming water temperature detecting means for detecting the incoming water temperature of the hot water before heat exchange at the water outlet flows out from the water side of the water refrigerant heat exchanger 22 and heat exchange is performed in the water refrigerant heat exchanger 22. Detect the boiling temperature of hot water A boiling temperature sensor as boiling temperature detecting means.

  When the outside air temperature sensor 30 detects a temperature lower than a predetermined temperature, that is, lower than 7 ° C., the target set temperature when the hot water is poured from the faucet 12 to the bathtub 13 is increased by + 2 ° C. Fixed amount Here, the hot water storage control means 17 performs control of the correction hot water filling in which 60% = 120L of the full amount is filled with water, and the remaining 40% = 80L is filled with the original target set temperature. When the detected temperature of the outside air temperature sensor 30 is 7 ° C. or more and less than 16 ° C., the target set temperature when dropping hot water from the faucet 12 to the bathtub 13 is increased by + 1 ° C. After filling 40% = 80L of the full amount, the remaining 60% = 120L is filled with the original target set temperature.

  Reference numeral 33 denotes a heating control means as a control means for receiving the output of each sensor in the heat pump unit 3 and controlling the operation of each actuator. The heating control means 33 is communicably connected to the hot water storage control means 17 and operates in cooperation with the hot water storage control means 17. To do.

Next, the operation of the boiling operation in the midnight time zone of this embodiment will be described.
In the late night hours when the power unit price is low, the hot water storage control means 17 starts the heating operation to heat up the hot water in the hot water storage tank 2 with the heat pump unit 3 so as to reach a predetermined heating target temperature. To instruct. The heating control means 33 controls the compressor 21 at the number of revolutions corresponding to the outside air temperature detected by the outside air temperature sensor 30, sets the target discharge temperature according to the boiling target temperature, and detects it by the discharge temperature sensor 28. The opening degree of the expansion valve 23 is controlled so that the discharge temperature of the refrigerant to be reached becomes the target discharge temperature. Further, the outdoor fan 26 is also controlled at a preset rotation speed corresponding to the outside air temperature detected by the outside air temperature sensor 30. At the same time, the heating control means 33 controls the rotational speed of the circulation pump 27 so that the temperature of the hot water heated by the water / refrigerant heat exchanger 22 detected by the boiling temperature sensor 32 becomes the boiling target temperature. The heating control means 33 performs a boiling operation.

Next, dropping hot water filling from the faucet 12 to the bathtub 13 will be described with reference to the flowchart shown in FIG.
In step S1, the faucet 12 is opened and the dropping switch A is turned on to start filling the dropping hot water. The hot water storage control means 17 looks at the temperature detected by the outside air temperature sensor 30, and the outside air temperature is 16 ° C. in step S2. In the above, the process proceeds to step S3 with YES, and the mixing valve 10 is controlled at the detected temperature of the hot water supply temperature sensor 14 with the hot water filling target set temperature kept at the temperature set by the bath remote controller 18, and in step S4 the hot water supply It is determined whether or not the dropped hot water amount counted by the flow rate sensor 15 has reached the full amount of 200 L, the process proceeds to step S5 with YES, the faucet 12 is closed by the notification sound of the notification means 20, and the hot water filling ends. When the outside air temperature is high and there is no heat dissipation loss, normal dropping hot water filling is performed.

  Next, if the outside air temperature is low and NO in step S2, the process proceeds to step S6 to determine whether the detected temperature of the outside air temperature sensor 30 is 7 ° C. or more and less than 16 ° C. If YES, the process proceeds to step S7 and the hot water temperature is set to the target set temperature + 1. In step S8, it is determined whether the hot water filling amount at the target set temperature + 1 ° C. is 40% of the full amount = 80 L. In YES, the process proceeds to step S9 to return the hot water filling temperature to the normal target setting temperature. Proceeding to step S10, it is determined whether or not the remaining hot water amount is 60% of the full amount = 120 L. If YES, the process proceeds to step S5 and the faucet 12 is closed by the notification sound of the notification means 20, and the hot water filling ends. When the outside air temperature is slightly low and there is some heat dissipation loss, the temperature of the dropped hot water filling is increased by + 1 ° C, and correction hot water filling is performed to restore the original after 40% hot water filling. Minute can be compensated without excess or deficiency, in which bathing at the target set temperature is possible.

  On the other hand, if the outside air temperature is further lower and NO in step S6, the process proceeds to step S11 to determine whether the detected temperature of the outside air temperature sensor 30 is less than 7 ° C. If YES, the process proceeds to step S12 and the hot water temperature is set to the target set temperature + 2 ° C. In step S13, it is determined whether the filling amount at the target set temperature + 2 ° C. has reached 60% of the full amount = 120 L. If YES, the flow proceeds to step S14, the hot water filling temperature is returned to the normal target setting temperature, and the flow proceeds to step S15. Then, it is determined whether the hot water filling amount has reached the remaining 40% = 80 L, and if YES, the process proceeds to step S5 and the faucet 12 is closed by the notification sound of the notification means 20 to complete the hot water filling. When the temperature is low and there is a lot of heat dissipation loss, the loss due to heat dissipation is increased by increasing the temperature of the dropped hot water bath by + 2 ° C and performing correction hot water filling that returns to the original state after 60% hot water bathing. It can be compensated without legs, one in which bathing at the target set temperature is possible.

  In this way, by providing the correction hot water filling to the drop hot water filling, the amount of heat filling from the pipe and the bathtub 13 is predicted and the hot water filling temperature and the hot water filling amount are automatically determined and the hot water filling is performed. A safe bath is always available and can be used with confidence.

2 Hot water storage tank 7 Water supply pipe 8 Hot water discharge pipe 9 Water supply bypass pipe 10 Mixing valve 11 Hot water supply pipe 12 Faucet 13 Bathtub 14 Hot water supply temperature sensor 15 Hot water supply flow rate sensor 17 Hot water storage control means 20 Notification means 30 Outside air temperature sensor

Claims (2)

A hot water storage tank for storing hot water heated by the heating means, a hot water pipe for discharging hot water in communication with the upper part of the hot water storage tank, a water supply pipe for supplying water in communication with the bottom of the hot water storage tank, and A mixing valve that mixes high temperature water and low temperature water from a water supply bypass pipe branched from the water supply pipe, and a hot water pipe that performs hot water filling to drop the mixed water mixed in the mixing valve directly from the faucet of the terminal into the hot water and bathtub , A hot water temperature sensor for detecting the hot water temperature, a hot water flow sensor for counting the amount of hot water, and controlling the mixing valve so that the set target temperature is reached when the hot water is dropped into the bathtub. And a hot water storage control means for notifying the hot water stoppage when the hot water storage temperature reaches the upper limit, the hot water storage control means increases the target set temperature as the outside air temperature detected by the outside air temperature sensor decreases. Predetermined Corrected water filling to increase hot tension also hot water storage type hot-water supply system, characterized in that was again returned to the hot water filling in the original target setting temperature. The hot water storage type hot water supply apparatus according to claim 1, wherein the correction hot water filling is performed at an initial stage of the hot water filling.

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