Direct heating energy-saving heat pump water heater

Abstract

The invention relates to the field of energy saving equipment, and aims to provide a direct heating energy-saving heat pump water heater with high heating performances. The direct heating energy-saving heat pump water heater comprises a compressor; an outlet of the compressor is connected with an outer pipe of a sleeve heat exchanger; the tail end of the outer pipe of the sleeve heat exchanger is connected with an electronic expansion valve; the electronic expansion valve is connected with an evaporator; the evaporator is connected with a gas-liquid separator; and the gas-liquid separator is connected with an inlet of the compressor. The outer pipe of the sleeve heat exchanger is uniformly divided into multiple sections in the flowing direction of a heat medium; an outlet of the compressor is connected with each section of the outer pipe through a shunting valve; one-way valves are respectively arranged between two adjacent sections of the outer pipe; and an inner pipe of the sleeve heat exchanger is respectively connected with a running water pipe network and a water storage tank. The direct heating energy-saving heat pump water heater can accelerate the heat exchange speed of a heat exchange medium and water, and greatly improves the heating performances.

Description

technical field [0001] The invention relates to the field of energy-saving equipment, in particular to a heat pump water heater. Background technique [0002] A heat pump water heater is a device that uses the reverse Carnot principle to transfer heat from a low-temperature object to water through a medium. The heat pump device can change the phase of the medium (refrigerant), and the temperature is lower than that of the low-temperature heat source, thereby spontaneously absorbing the heat of the low-temperature heat source, returning to the medium after the compressor, and being compressed into a high-temperature and high-pressure gas, thereby spontaneously exothermic, and realizes cooling from low temperature The heat source "transfers" heat. The working process of the heat pump water heater is that the compressor compresses the returning low-pressure refrigerant and turns it into high-temperature and high-pressure gas to be discharged. The high-temperature and high-pres...

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Problems solved by technology

[0003] However, the heat exchange effect of the existing heat pump water heaters is not ideal. Specifically, the existing heat pump water heaters mainly use casing heat exchangers. Heat rate = heat transfer driving force (temperature difference) / heat transfer thermal resistance, that is, the greater the temperature difference, the higher the heat transfer rate. Therefore, at the end of the sleeve heat exchanger, after the temperature of the heat exchange medium drops, the heat transfer rate becomes slower. As a result, the casing heat exchanger of the heat pump water heater has a large difference in heat transfer performance at both ends, unstable heating, and low heating performance

In addition, due to the slow heat exchange between the heat exchange medium and water at the end of the sleeve heat exchanger, the heat exchange medium has not been sufficiently cooled after flowing out of the sleeve heat exchanger, which increases the compressor load and affects the whole machine. adverse effect on the service life of the

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