An air source multi -connected air -conditioning heat pump system and its running method

Abstract

An air source multi-connected air conditioner heat pump system and its operation method belong to the field of heating and air conditioning. The system includes four parts: outdoor unit, heat pump host, defrosting module and indoor unit. The outdoor unit includes at least one parallel cooling tower module, at least two parallel air cooled heat exchanger modules, a first liquid pump and a second liquid pump. The defrosting module includes a defrosting heat exchanger and a second throttle valve, and is connected in parallel with the indoor unit. The air-source multi-connected air-conditioning heat pump system of the present invention discharges heat to the outside through the cooling tower during cooling in summer; during heating in winter, takes heat from the outside through the air-cooled heat exchanger, and uses the defrosting module to produce hot water Defrost the air-cooled heat exchanger. The system and its operation method have the characteristics of efficient cooling in summer, reliable heating and defrosting in winter, and solve the problem that conventional air source multi-connected air-conditioning heat pump systems cannot balance cooling efficiency and heating reliability.

Description

technical field [0001] The invention relates to an air source multi-connected air-conditioning heat pump system and an operating method thereof, belonging to the technical field of heating and air-conditioning. Background technique [0002] The multi-connected air-conditioning heat pump system uses refrigeration cycle or heat pump cycle, combined with variable refrigerant flow control technology, uses the ambient heat source as a high-temperature heat source or low-temperature heat source in winter and summer, and uses multiple terminals to provide cooling or heat to users. According to the different forms of heat sources, the multi-connected air-conditioning heat pump system is mainly divided into two types: air source and water source, among which the air-source multi-connected air-conditioning heat pump system is the main system form at present. According to the different cooling methods of outdoor units, the air source multi-connected air-conditioning heat pump system is...

AI Technical Summary

Problems solved by technology

The Chinese patent (authorized notification number CN102878737B) uses multiple outdoor unit modules to defrost alternately, and there is also the problem that frequent switching of the four-way valve affects the life of the four-way valve

The multi-phase change energy storage hydrothermal defrosting system proposed by the Chinese patent (authorized notification number CN 102003853 B) avoids the above problems, but has the disadvantages of low energy storage density, high cost and poor durability

Although this method solves the problem of cooling water antifreeze and avoids defrosting, it has the disadvantages of high solution cost, large drift loss, and high regeneration energy consumption. Due to the limitation of the installation position of the energy tower, it is far away from the indoor unit, increasing the energy consumption. The size of the refrigerant pipeline is increased, resulting in multi-connected performance degradation

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