JPH02230051A - Hot water storing type hot water feeding device - Google Patents

Abstract

PURPOSE:To reduce a thermal loss and provide a small-sized hot water tank operated under an efficient manner by a method wherein upon completion of use of hot water within the hot water storing tank, if an accumulated calorie within the hot water storing tank sensed by a temperature sensor and a water level sensor is less than a predetermined value, a non-azeotropic mixture refrigerant of a heat pump cycle is separated by a separator device. CONSTITUTION:If a hot water temperature TH within a hot water staring tank 1 is more than a fourth set temperature T4, a mixing operation for non-azeotropic mixture refrigerant within a heat pump cycle is carried out. When a load completion signal is inputted and an accumulated calorie Q within the hot water storing tank detected by a temperature sensor 4 and a water level sensor 3 is less then a set value Q0, a first two-way valve 15 and a third two-way valve 17 of the heat pump cycle 2 are opened and a second two-way valve 16 is closed and at the same time an electrical power is fed to the heater 11. The heater is operated for a specified period of time to perform a separation of the non-azeotropic mixture refrigerant. After this operation, an operation of a compressor 5 is stopped under an operation of a control device 14 so as to clear the load completion signal and further the system is ready for an operation of tomorrow. Accordingly, it is possible to start the operation under a state in which the non-azeotropic mixture refrigerant is separated tomorrow.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water storage type hot water supply device, and particularly to a hot water storage type hot water supply device using a heatbon 1 as a heating source. (Background of the invention) Conventionally, heat bombs have been developed with a coefficient of performance by detecting the outside temperature and the water temperature in the hot water storage layer and changing the boiling time on a daily basis in order to boil the water to a predetermined temperature by a predetermined time in the evening. A storage-type water heater has been proposed that operates in a high temperature range and provides a predetermined hot water temperature when hot water is used in the evening (see, for example, Japanese Patent Application Laid-Open No. 122863/1983). However, with this conventional hot water type water heater, although the heat pump can be operated in a region with a high coefficient of performance, the hot water storage layer is always filled with water and heat collection operation is performed, resulting in excessive heat collection. Moreover, in order to maintain the hot water used the next morning at a predetermined temperature, there was a problem in that the amount of hot water was large, resulting in large heat loss and the need for a large hot water storage tank. On the other hand, recently, it has been proposed to drive a heat pump cycle using a non-azeotropic mixed refrigerant (see, for example, Japanese Patent Application Laid-Open No. 62-245053), but there are no studies regarding its specific application or control method. There are no announcements. The present invention has been devised against this background, and provides a hot water storage type water heater that has low heat loss, can downsize the hot water storage tank, and can efficiently perform heat collection operation. The purpose is to (Structure of the Invention) According to the present invention, there is provided a load end signal input device to which a load end signal is input when the use of hot water in a hot water storage tank is finished; A temperature sensor and a water level sensor are provided to detect the amount of heat stored in the water in the hot water storage tank, and when the amount of heat stored in the hot water storage tank detected by the temperature sensor and the water level sensor is less than a predetermined value, the separation device starts the heat pump cycle. A hot water storage type water heater is provided which is characterized by separating a non-azeotropic mixed refrigerant, thereby achieving the above object. (Execution Tsuba) The present invention will be explained in detail below based on the attached drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water storage type water heater according to the present invention, in which 1 is a hot water storage tank and 2 is a heat pump cycle that heats water in the hot water storage tank 1. The hot water tank 1 is provided with a water level sensor 3 that detects the water level in the hot water tank 1 and a temperature sensor 4 that detects the temperature of the water in the hot water tank 1.
For example, a control device 1 composed of a microcomputer, etc.
It is connected to 4. The control device 14 includes a hot water storage tank 1
A load end signal input device 13 is connected to which a load end signal is input when one day's worth of hot water has been used. This load termination signal input device 13 is specifically constructed of a device using a manual switch or a timer. The heat pump cycle 2 has a main cycle composed of a pressure Wi machine 5, an evaporator 6, an expansion valve 7, and a condenser 8 disposed in the hot water storage tank 1, and a refrigerant component in parallel with the expansion valve 7. A storage device 12 is provided. In this heat pump cycle 2,
R22, which can obtain high efficiency in low temperature ranges, and R114, which can obtain high efficiency by lowering pressure in high temperature ranges.
A non-azeotropic mixed refrigerant consisting of etc. is sealed. The refrigerant separation device 12 mainly includes a rectification column 9 for separating the refrigerant, a reservoir 10 for storing the separated high-boiling refrigerant, and a heater 11 for heating the refrigerant in the reservoir 10. , the two-way valves 15, 17 are opened, the two-way valve 16 is closed, and the heater 11 is turned ON to perform a separation operation of the non-azeotropic mixed refrigerant, and the two-way valves 15, 16, 17 are opened. By turning off the heater 11, the non-azeotropic refrigerant mixture is mixed. Note that 18 and 19 in FIG. 1 are cavillary tubes that adjust the pressure within the cycle. FIG. 2 is a flowchart for explaining the basic operation (for example, daytime heat collection operation state) of the hot water storage type water heater configured as described above. Set temperature?
1 to T4 are T3 < T2 < Ta · T1.
First, the water level Hw in the hot water storage tank 1 detected by the water level sensor 3 is compared with a preset minimum tree level H0. The water level in hot water tank 1 is the lowest level H. If it is below, open the water supply solenoid valve (not shown) and the inside of the hot water tank 1 is at the lowest wood level I4. Water until the lowest tree level is H. Stop the water supply when this happens. Next, the hot water temperature TH in the hot water storage tank 1 detected by the temperature sensor 4 and the first set temperature are set to T. Compare with. The water temperature in the hot water tank 1 T. If the temperature is below the first set temperature T, the compressor 5 is driven to circulate the refrigerant in the heat bomb cycle 2 and heat the water in the hot water storage tank 1. In this case, it is assumed that the refrigerant circulating in the main cycle has a composition ratio rich in R22, which is a low boiling point refrigerant (separated state of non-azeotropic mixed refrigerant).Next, heatbon 7 cycle 1 is operated to store hot water. When the water temperature T■ in the tank 1 becomes equal to or higher than the second set temperature T2, the solenoid valve for water supply (not shown) is reopened and water supply continues until the water temperature T becomes equal to or lower than the third set temperature T3. When the temperature falls below T3, the water supply is stopped.Similarly, by periodically repeating the water supply operation while continuing the heating operation, the hot water tank 1
The water temperature inside is the second set temperature T2 and the third set temperature T3.
The amount of hot water in tank 1 is gradually increased while maintaining it within the range of . Even if hot water is used during this heating operation and the amount of hot water in the hot water storage tank 1 decreases, the amount of hot water in the hot water storage tank 1 is gradually increased by periodically repeating the water supply operation while heating in the same way as the above-mentioned operation. ．． Note that when the hot water in the hot water storage tank 1 reaches a predetermined water level or higher, the water supply operation is completely stopped by a pole tap (not shown). In this way, the heating operation is continued by operating the heat pump even after the tank is filled with water, but the temperature of the hot water in the hot water storage tank 1 remains constant. When the temperature exceeds the fourth set temperature T4, the non-azeotropic refrigerant mixture in the heat pump cycle is mixed. In this case, the first two-way valve 15 provided in the separation device 12
, the second two-way valve 16 and the third two-way valve 17 are opened and the operation is continued for a while, and the refrigerant is discharged. After mixing, the first three-way valve 15
, by operating the third two-way valve 17, the heat pump is operated in a mixed state of the non-azeotropic refrigerant mixture to heat the water in the hot water storage tank 1. Then, the temperature of the hot water in the hot water tank 1 is T. Heating is performed until the temperature reaches the first set temperature. In this way, the amount of stored hot water is gradually increased while repeating the water supply operation within the range of the lowest and highest water levels in the hot water storage tank 1, so that hot water at the set temperature is always supplied and, for example, in the morning when a small amount of hot water is used. There is no need to fill up the hot water tank during the day when hot water is not used much; for example, it is sufficient to operate the hot water tank 1 so that it is full by the evening when a large amount of hot water is used. Therefore,
Hot water storage 8! ! 1 only needs to have enough capacity for the hot water that will be used in the evening, for example, and the hot water tank itself can be made smaller. FIG. 3 is a flowchart showing the operation after the hot water in the hot water storage tank 1 has been used for one day and the load end signal is input. First, when the load end signal is input, the temperature sensor 4
The amount of heat stored in the hot water tank Q detected by the water level sensor 3 is the set value Q. When the following conditions are met, the first two-way valve 15 and the third two-way valve 17 of the heat pump cycle 2 are opened, the second two-way valve 16 is idled, and the power is turned on to the heater 11 for a certain period of time. By operating the system, the non-azeotropic refrigerant mixture is separated. Thereafter, the control device 14 stops the operation of the compressor 5, clears the load end signal, and prepares for the next day's operation. Therefore, the next day, operation can be started immediately with the non-azeotropic mixed refrigerant separated. Note that the amount of heat stored in the hot water tank 1 when the negative evening end signal is inputted is the predetermined value Q. If it is above, the non-azeotropic mixed refrigerant is not separated, but the heat storage JLQ in the hot water storage tank 1 is the predetermined value Q. In the above cases, there is no problem as the heat collection operation will immediately start the next day with the non-azeotropic refrigerant mixed. (Effects of the Invention) As described above, according to the hot water storage type hot water supply apparatus according to the present invention, the load termination signal input device receives the load termination signal when the use of hot water in the hot water storage tank is finished; A temperature sensor and a water level sensor are provided to detect the amount of heat stored in the water in the hot water tank when a signal is input, and when the amount of heat stored in the hot water tank detected by the temperature sensor and the water level sensor is below a predetermined value. To provide a hot water storage type hot water supply device which is capable of responding immediately to the next day's heat collection operation start situation by performing a separation operation of the non-azeotropic mixed refrigerant in the heat bomb cycle, and which has extremely excellent heat collection efficiency. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of a hot water storage type water heater according to the present invention, Fig. 2 is a flowchart showing the basic heat collecting operation, and Fig. 3 is a diagram showing the same example when a load end signal is input. It is a flowchart diagram showing the subsequent operation. ■, hot water storage ff 2, heat bomb cycle 3,
Water level sensor 4, temperature sensor 8, condenser 12, refrigerant separation device 13, load end signal input device

Claims (1)

[Scope of Claims] A heat pump cycle having a separation device for separating a non-azeotropic mixed refrigerant, and a hot water storage tank in which a condenser of the heat pump cycle is disposed, the heat pump cycle having a separation device for separating the non-azeotropic mixed refrigerant. In the hot water storage type water heater that heats water in the hot water storage tank by operating in a state or a mixed state, the load end signal input device receives a load end signal when the hot water in the hot water storage tank is used. , a temperature sensor and a water level sensor are provided to detect the amount of heat stored in the water in the hot water storage tank when the load end signal is input, and the amount of heat stored in the hot water storage tank detected by the temperature sensor and the water level sensor is a predetermined amount. A hot water storage type hot water supply device, characterized in that when the temperature is below the value, the non-azeotropic mixed refrigerant of the heat pump cycle is separated by the separation device.