A frost-free air source heat pump device and method based on membrane dehumidification and indoor regenerative humidification

Abstract

The invention discloses a frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification. The frostless air source heat pump device comprises a refrigerant circulation loop and a solution dehumidification / humidification circulation loop. The refrigerant circulation loop comprises a compressor (1), a four-way reversing valve (2), an indoor heat exchanger (3), a regeneration condenser (4), a throttling valve (5) and an outdoor heat exchanger (6) which are sequentially connected together in series through a first communication pipeline. The solution dehumidification / humidification circulation loop comprises a heat recovery heat exchanger (10), a regeneration condenser (4), an indoor humidification membrane assembly (11), a heat recovery heat exchanger (10), an outdoor dehumidification membrane assembly (7) and a dehumidification solution storage tank (8). According to the frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification, outdoor air latent heat is converted into sensible heat through the dehumidification membrane assembly, frosting is avoided, and moisture introduced through a dehumidification solution is regenerated and used for indoor humidification.

Description

technical field [0001] The invention relates to a frost-free air source heat pump device and method based on membrane dehumidification and indoor regeneration humidification, and belongs to the technical fields of membrane dehumidification, vapor compression refrigeration and defrosting. Background technique [0002] Air source heat pump is a kind of equipment with simple structure, flexible configuration and high cooling and heating energy efficiency, which is more and more popular. However, in some hot summer and cold winter areas with high humidity, when the outdoor temperature is lower than 0 °C in winter, the outdoor fin heat exchanger of the heat pump often has frosting problems, which leads to the reduction of energy efficiency and poor operation stability of the air source heat pump. Seriously restricting the scope and development of air source heat pumps. At the same time, due to the increase of indoor heating temperature in winter and the decrease of relative humi...

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Problems solved by technology

[0003] At present, the main defrosting technologies for heat pumps include reverse cycle defrosting, hot gas bypass defrosting, and electric heating defrosting, etc., but these defrosting methods require additional power consumption, which reduces the heating efficiency of heat pumps and affects indoor thermal comfort and Stability of heating

In recent years, some researchers have proposed many new defrosting and frosting suppression methods, a typical frost-free air source heat pump system proposed by Chen Guangming of Zhejiang University (patent application number: CN200910098008.5), the device uses The antifreeze solution acts as a heat transfer medium to absorb the heat of the outdoor low-temperature air, and then transfers the heat of the solution to the outdoor evaporator, thus avoiding the frosting of the air source heat pump. However, this system does not solve the solution regeneration problem well and the system is complicated. Severe corrosion and high energy consumption

Wang Fenghao of Xi'an Jiaotong University and others proposed a heat storage and dehumidification coupled frost-free air source heat pump water heater (patent application number: CN201210520800.7). The low-temperature heat source solves the problem of insufficient energy source during defrosting, but the system needs to constantly switch between heating and defrosting modes, resulting in instability of indoor heating; Guangdong Xiwu Kangda Air Conditioning Co., Ltd. filed a patent application for "a kind of energy-saving Type frost-free air source heat pump system" (application number: 201310435416.1), this system aims at the problem that water-soluble antifreeze needs to be concentrated and regenerated, and proposes a method that uses hydrophobic antifreeze liquid as the low-temperature heat transfer medium, thereby avoiding the problem of solution regeneration , but the solution has problems such as low thermal conductivity and poor heat transfer effect

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