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Heat pump water heater

A technology for hot water supply and hot water, which is applied in the improvement field of instantaneous heat pump water supply machines, can solve the problems of shortening the temperature stabilization time of hot water supply and storage time of hot water, and achieve shortening of stabilization time and storage of hot water the effect of time

Inactive Publication Date: 2009-12-30
HITACHI APPLIANCES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the present invention, as means for solving the above-mentioned problems of the conventional heat pump water heater, when hot water is used during hot water storage operation, the heating temperature of the heat pump is not lowered to the hot water supply temperature, and the temperature of the stored hot water is maintained. Continuing to operate, thereby shortening the stabilization time of the hot water supply temperature and the hot water storage time

Method used

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no. 1 Embodiment

[0032] Below, use figure 1 An embodiment of the present invention will be described.

[0033] The heat pump water heater includes: a heat pump refrigerant circuit 30 , a water supply circuit 40 , and an operation control unit 50 .

[0034] The heat pump refrigerant circuit 30 is a dual-cycle system with two components. The compressors 1a and 1b, the refrigerant-side heat transfer tubes 2a and 2b arranged in the water-refrigerant heat exchanger 2, and the decompression device 3a are respectively connected through refrigerant piping. , 3b and evaporators 4a, 4b are sequentially connected to form, in which filled with refrigerant.

[0035] The compressors 1a and 1b are capable of capacity control, and operate at a large capacity when a large amount of hot water is supplied. Here, the rotational speed of the compressors 1a, 1b is controlled from low speed (eg 700 rpm) to high speed (eg 7000 rpm) through PWM control, voltage control (eg PAM control) and their combination control....

no. 2 Embodiment

[0085] A second embodiment of the present invention will be described below. In addition, due to the structure of the parts and the hot water storage operation, the hot water supply operation are different from the Figure 1 ~ Figure 3 It is the same as the first embodiment described in , so the description is omitted.

[0086] Figure 5 It is a flow chart showing the operation when hot water is used in the hot water storage operation in this embodiment. figure 1 The component structure is described.

[0087] When the hot water storage operation command is issued through the control of the operation control unit 50 (step 101), the temperature of the hot water storage and the amount of the hot water storage are judged (step 102), and if they are within the specified value, the hot water storage operation is not performed. , if the stored warm water decreases below the specified value, the hot water mixing valve 12 will connect between the side of the water-cooling medium hea...

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Abstract

The present invention provides a heat pump water heater capable of shortening stable time of supplying hot water and hot water storing time. In the heat pump water heater comprising a cool medium loop, a hot water storing loop, a hot water supplying loop and an operation control unit, the hot water supplying loop has a direct hot water supplying loop directly supplying mild water heated by the water cooling medium heat exchanger from the hot water outputting contact head, the operation control unit stops the hot water storing operation to offer priority to hot water use when using hot water in process of storing hot water, the heat pump maintains heating temperature to continue the operation when storing hot operation, and supplies low temperature water into the mild water heated by the water cooling medium heat exchanger. Thus, even using hot water in hot water storing operation, the heat pump also can maintains the heating temperature of storing hot water to continue the operation, then stable time of supplying hot water when the hot water supplying operation and the hot water storing time after hot water is used can be shorten.

Description

technical field [0001] The present invention relates to a heat pump water supply machine, in particular to an improvement of an instantaneous heat pump water supply machine having a direct hot water supply circuit for directly supplying warm water heated by the operation of the heat pump to a water terminal. Background technique [0002] Existing heat pump water heaters generally use the hot water storage method, that is, they are equipped with large-capacity hot water storage tanks like electric water heaters, and use cheap discounted electricity at night to heat hot water through the heat pump refrigerant circuit in the middle of the night and store it in the heat storage tank. In the water tank, use this stored hot water during the day. [0003] In contrast, in recent years, instantaneous heat pump water heaters have been developed that directly supply warm water heated by heat pump operation and greatly reduce the size of the hot water storage tank. [0004] As an examp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24H4/04
CPCY02B30/62Y02A30/27F24D17/02F24H1/48F24H4/02F24H9/20F25B30/02Y02B30/12
Inventor 榎津丰权守仁彦高木纯一坂本浩一森本胜也宫田真理增田正水谷圭一堀田和孝
Owner HITACHI APPLIANCES INC