Heat pump water heater
A heat pump water heater and hot water technology, which is applied in heat pumps, residential hot water supply systems, refrigerators, etc., can solve the problems of insufficient water pressure and increased water pressure drop of water heat conduction pipes, etc., to improve heat conduction sexual effect
Inactive Publication Date: 2009-10-14
HITACHI APPLIANCES INC
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Problems solved by technology
However, in order to realize the heat pump device of the instant hot water system, it is necessary to heat the unheated water in a very short time, and there are problems such as increasing the capacity of the compressor and improving the heat conductivity of the water-refrigerant heat exchanger.
Among them, if it is desired to output hot water through the water pressure of the upper water channel, in order to improve the thermal conductivity and lengthen the water heat transfer pipe with thinner flowing water, the water pressure drop in the water heat transfer pipe will increase, and sufficient water pressure will not be obtained when the water is discharged. The problem
Method used
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[0029] Below, use Figure 1 to Figure 3 Examples of the present invention will be described. figure 1 The shown heat pump water heater is composed of a heat pump refrigerant circuit 30 , a hot water circuit 40 , and an operation control device 50 .
[0030] The heat pump refrigerant circuit 30 includes two refrigeration cycles. Each cycle connects the compressors 1a, 1b, the condensers 2a, 2b, the decompression devices 3a, 3b, and the evaporators 4a, b sequentially via the refrigerant piping, and the refrigerant is sealed in each cycle.
[0031] The capacity-controllable compressors 1a and 1b operate at a large capacity when supplying a large amount of hot water. The compressors 1a, 1b are controlled from low-speed rotation (eg, 2000 rpm) to high-speed rotation (eg, 8000 rpm) by PWM control, voltage control (eg, PAM control) and their combination control.
[0032] The water-refrigerant heat exchanger 2 includes refrigerant side heat transfer tubes 2a and 2b and feed water s...
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PURPOSE: A hot water supply system using a heat pump is provided to reduce energy consumption, and to prevent global warming by operating the hot water supply system timely and supplying the required amount of hot water at the desired temperature. CONSTITUTION: A hot water supply system using a heat pump is composed of a heat pump refrigerant circuit(30) connected to compressors(1a,1b), a water-refrigerant heat exchanger(2) exchanging heat between water and refrigerant, a decompression unit and an evaporator exchanging heat with air and refrigerant through a refrigerant pipe, and a heat pump water supply circuit(40) connecting a water supply source and the water-refrigerant heat exchanger to a water supply pipe and the water-refrigerant heat exchanger and a water supply member to a hot water supply pipe. The water-refrigerant heat exchanger is composed of refrigerant heat transfer pipes(2a,2b) flowing refrigerant from the heat pump refrigerant circuit and water heat transfer pipes(2e,2f) installed between the water supply pipe and the hot water supply pipe.
Description
technical field [0001] The present invention relates to a heat pump water heater, in particular to a heat pump water heater with an instantaneous hot water function of directly supplying water heated by a water-refrigerant heat exchanger to a water use terminal. Background technique [0002] Existing heat pump water heaters are generally equipped with large-capacity water storage tanks like electric water heaters. They use cheap reduced-price electricity at night, use the heat pump refrigerant circuit to boil hot water at night, and store them in the water storage tank. Stored hot water. [0003] However, in the above-mentioned water supply method, the amount of hot water in the water storage tank is constant, and the amount of hot water will be insufficient on days with a large amount of use, and energy will be lost due to the cooling of the remaining hot water on days with a small amount of use. In addition, in the case of using the bathroom, after injecting hot water int...
Claims
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IPC IPC(8): F24H1/00F28D7/00F28D7/02F24D17/02F24H4/02
CPCF24D17/02F24H1/48F24H4/04F24H9/2007F25B30/02Y02B30/12
Inventor 齐藤健一福岛功一大川丰和冈村哲信权守仁彦
Owner HITACHI APPLIANCES INC