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Heat-pump hot water supply apparatus

A heat pump water heater, hot water technology, applied in the directions of fluid heaters, energy-saving heating/cooling, lighting and heating equipment, etc., can solve the problems of insufficient hot water volume and low hot water temperature, and achieve improved convenience and convenience of use. , the effect of eliminating anxiety

Inactive Publication Date: 2008-12-17
HITACHI APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For example, when the outside air temperature is low in winter, after the supply of hot water for bathing is completed, when the shower is used in a short time, the air heat exchanger will be in a state of frost, which is prone to insufficient hot water or low temperature of the supplied hot water Case

Method used

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  • Heat-pump hot water supply apparatus

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Embodiment 1

[0028] A heat pump water heater according to an embodiment of the present invention shown in FIG. 1 has a heat pump refrigerant circuit 30 , a hot water supply circuit 40 , and an operation control device 50 .

[0029] The heat pump refrigerant circuit 30 is a dual-circulation method with two parts each, and the compressors 1a, 1b, and the refrigerant-side heat transfer tube 2a arranged on the water-refrigerant heat exchanger 2 are connected in sequence through refrigerant pipes. , 2b, decompression devices 3a, 3b, air heat exchangers 4a, 4b, the refrigerant circuit 30 is sealed with refrigerant.

[0030] The compressors 1a and 1b are capable of capacity control, and operate at a large capacity when supplying a large amount of hot water. Here, the compressors 1a and 1b are controlled from low speed (such as 700 rpm) to high speed (such as 7000 rpm) through PWM control, voltage control (such as PAM control) and combination control of these control methods. .

[0031] The wate...

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Abstract

The problem to be solved by the present invention is that, in a heat pump water heater capable of directly supplying heated water while supplying hot water from a hot water storage tank at the start of operation, when the outside air temperature is low in winter, when hot water is injected into the bathtub When running for a long time, the time required for the hot water storage tank to store hot water at the next start of operation will be extended due to the frosting of the air heat exchanger, which may affect the use of hot water during this period. The heat pump water heater of the present invention detects the temperature of the air heat exchanger, sets the defrosting start temperature and the required defrosting temperature lower than the defrosting starting temperature, and when it is between the defrosting starting temperature and the required defrosting temperature, the After the operation of storing hot water in the hot water storage tank, perform defrosting operation, and then stop the operation; when the temperature is below the required defrosting temperature, while giving a warning, give priority to the defrosting operation, then perform the operation of storing hot water in the hot water storage tank, and then stop run.

Description

technical field [0001] The invention relates to improving the convenience of use when a heat pump water heater is frosted at a low temperature. Background technique [0002] The original heat pump water heater is generally used to store hot water, that is, it is the same as the electric water heater, equipped with a large-capacity hot water storage tank of 300L ~ 500L, and uses cheap electricity at night when the electricity price is low at night to run the heat pump at night. After heating the water Store in a hot water storage tank, and use the above-mentioned stored hot water during the day. [0003] In recent years, a technical solution of an instant heat pump water heater has been proposed by setting a hot water storage tank supply hot water circuit that supplies hot water from a hot water storage tank at the start of operation and directly supplying hot water heated by heat pump operation The direct hot water supply circuit, when the hot water is used from the water t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24H4/02F25B47/02F25B49/00
CPCF24H4/02F24H9/2007F25B47/02Y02B30/12Y02B30/70F24H1/54
Inventor 远藤和广权守仁彦高木纯一
Owner HITACHI APPLIANCES INC
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