Variable-component refrigerant heat pump hot water unit

Abstract

The invention discloses a variable-component refrigerant heat pump hot water unit which comprises a compressor, a condensing heat exchanger, a liquid storage tank, an outdoor heat exchanger, a gas-liquid separator, a rectifier filled with refrigerants and a coil arranged in the rectifier. The coil and a first electromagnetic valve are arranged between an outlet of the compressor and an inlet of the condensing heat exchanger in parallel. Two branches connected in parallel are arranged between the liquid storage tank and the outdoor heat exchanger. The first branch is formed by connecting an outlet of the liquid storage tank, a third electromagnetic valve, a first throttling valve and an inlet of the outdoor heat exchanger in sequence. The second branch is formed by connecting the outlet of the liquid storage tank, a fourth electromagnetic valve, a second throttling valve, the rectifier, a second electromagnetic valve and the inlet of the outdoor heat exchanger in sequence. The variable-component refrigerant heat pump hot water unit is additionally provided with the rectifier and the electromagnetic valves so that conversion of the refrigerants of different components can be achieved according to the outdoor environment temperature, and the variable-component refrigerant heat pump hot water unit has high adaptability to the environment temperature.

Description

technical field [0001] The invention belongs to the technical field of heat pump water heating units, in particular to a variable component refrigerant heat pump water heating unit. Background technique [0002] With the continuous improvement of people's living standards, people's requirements for living environment and thermal comfort are also increasing. Traditional building heating methods have high energy consumption and serious pollution, so it is extremely urgent to develop clean building heating technologies. The current heat pump technology cannot adapt to a wide range of ambient temperature changes, especially in cold regions, where the outdoor temperature is low in winter, the traditional single-stage heat pump system has a high compression ratio, the heating performance drops sharply, and it cannot work normally. However, compared with year-round heating, The time when the ambient temperature is extremely low in winter accounts for a relatively small percentage ...

AI Technical Summary

Problems solved by technology

The traditional building heating method has high energy consumption and serious pollution, so it is urgent to develop clean building heating technology

The current heat pump technology cannot adapt to a wide range of ambient temperature changes, especially in cold regions, where the outdoor temperature is low in winter, the traditional single-stage heat pump system has a high compression ratio, the heating performance drops sharply, and it cannot work normally. However, compared with year-round heating, The time when the ambient temperature is extremely low in winter accounts for a relatively small percentage of the year. If a high-pressure ratio or a two-stage compression system is used only to solve winter heating, the system will fail or have low energy efficiency at a higher ambient temperature. Therefore, The economics of the system become poor

[0003] Chinese patent ZL98118641.6 discloses a heat pump system with variable composition refrigerants, which uses the refrigerant flowing out of the condenser to heat the rectification tower, and separates the low-pressure component refrigerant in the rectification tower, so that more High-pressure components participate in the cycle to enhance the heating capacity in low-temperature environments, but the system has the following problems: 1) The temperature of the refrigerant flowing out of the condenser is not high, and the rectification effect is poor; 2) Reverse distillation It is difficult to practice; 3) The system is complex and the cost is too high

Chinese patent ZL98118646.7 discloses a heat pump system with variable composition refrigerant. The system adds an auxiliary coil connected in parallel to the outdoor unit. When the heating mode is turned on, the inlet of the auxiliary coil is closed and the outlet is opened, and the compressor The volatile high-pressure part is sucked out, and then the outlet valve is closed to leave the low-pressure part in the auxiliary coil, but the system has the following problems: 1) It relies on the compressor to vacuum the high-pressure refrigerant, which is easy to mix with low-pressure refrigerant, reducing Adjustability; 2) The auxiliary coil should be able to accommodate most of the liquid refrigerant, the volume of the auxiliary coil is relatively large, and the cost is relatively high

Images