Dual-heat source heat pump water heating all-in-one machine employing dual four-way valves for switching

Abstract

The invention discloses a dual-heat source heat pump water heating all-in-one machine employing dual four-way valves for switching. Three technical schemes are provided. The all-in-one machine is characterized in that two four-way valves are used for a refrigerant loop according to each technical scheme; and a compressor, a hot water heat exchanger, a water source heat exchanger, a wind source heat exchanger, a throttler and the like are connected into the dual-heat source heat pump water heating all-in-one machine with a wind-source or water-source water heating sub-cycle, a dual-source water heating sub-cycle and a defrosting sub-cycle. Firstly, according to a loop with a wind-source and dual-source serial sub-cycle, first to fourth joints of a first four-way valve are connected with an outlet of the compressor, an inlet of the hot water heat exchanger, an upper opening of the wind source heat exchanger and an inlet of a gas-liquid separator respectively; an outlet of the hot water heat exchanger is connected in series with a liquid storage device and a filter, and then is connected with an inlet of the throttler; first to fourth joints of a second four-way valve are connected with an outlet of the throttler, a lower opening of the wind source heat exchanger, a lower opening of the water source heat exchanger and an upper opening of the water source heat exchanger respectively; and an outlet of the gas-liquid separator is connected with an inlet of the compressor. Secondly, a water-source and dual-source serial sub-cycle is provided. Thirdly, a wind-source and dual-source parallel sub-cycle is provided.

Description

Technical field: [0001] The invention relates to the technical field of heat pump water heaters. Background technique: [0002] The heat pump water heater is a kind of heat energy absorbed from the air or water absorbed from the environment through the compression of the refrigerant, condensation heat release, throttling expansion, and evaporation heat absorption, which is upgraded to higher temperature heat energy for domestic hot water or water supply. Heating has obvious energy-saving effects. Generally, the energy efficiency ratio of heat pump water heaters is 3-4. Wind-water dual-source heat pump is an energy-saving heating equipment that can absorb heat from wind and water sources. It has the advantages of wide application and is widely used in bathhouses, swimming pools, hotels, etc.; Hot water function, better energy saving effect. The applicant has applied for multiple related patents. For example, simple, efficient and reliable heating and cooling air-conditioni...

AI Technical Summary

Problems solved by technology

This kind of dual-source heat pump water heater advertised on the market, its main function is to provide cold water for air conditioning in summer, recover part of the condensed heat to make hot water, and supply hot water heating at more than 40 degrees in winter, and it is difficult to provide a living temperature of 55 degrees or above. Hot water; because when the water source heat exchanger is used to absorb heat or cool down, the condensation heat of all the refrigerant cannot be recovered to make hot water, because the refrigerant gas is condensed into liquid in the hot water heat exchanger, and then enters the air source for heat exchange In winter, the defrosting of the air source heat exchanger must depend on the presence of water in the water source. If there is no water in the water source, it will not be able to absorb heat to defrost the air source heat exchanger, while the water source The water stored in the heater cannot prevent freezing; this kind of dual-source heat pump water heater cannot be used for waste hot water recovery of waste heat in places with limited water sources like bathing

Another type of air / water dual-source heat pump and hot water integrated machine with multiple heat absorption modes is designed to provide domestic hot water. The heater is only used by the condenser. The advantage is that it uses the wind source and the water source to make hot water; but the disadvantage is that in winter, its air source heat exchanger will frost and needs to be defrosted. In addition, its water source heat exchanger The water stored in the water side passage will also freeze and damage the equipment in winter; while the existing design of the wind / water dual-source heat pump and hot water all-in-one machine with multiple heat absorption modes that mainly provides hot water cannot replace the water source. The heater is heated to prevent freezing, which is a serious safety violation of the wind / water dual-source heat pump and hot water all-in-one machine with multiple heat absorption modes; moreover, the performance of the water condenser designed according to the standard working conditions is reduced in summer and winter, and the wind The source and water source heat exchangers have poor heat absorption capacity in winter, so that the performance of the heat pump water heater is not good when it operates in high temperature and low temperature conditions.

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