Dual-system heat pump roof unit

Abstract

The invention discloses a dual-system heat pump roof unit and belongs to the field of central air conditioners. The dual-system heat pump roof unit comprises two refrigerating and heating units which are respectively connected with an air system. The refrigerating and heating units are a main air conditioning system I and an auxiliary air conditioning system II which are independent and same in structure. Each of the main air conditioning system and the auxiliary air conditioning system comprises a compressor, a four-way valve, an outdoor fin type air-cooling condenser, an axial flow fan, a liquid storage barrel, a filter, an expansion valve, one-way valves and an electromagnetic valves, and all parts are connected through copper pipes. The air system is composed of a return air valve, a fresh air valve, a plate type air filter, fin heat exchangers, an air supply fan and an air supply valve, which are sequentially connected and mounted in a static pressure tank to form the closed air system. The dual-system heat pump roof unit is an energy-saving heating way and solves the problems of low-temperature heat attenuation and defrosting in winter, so that the unit can continuously supply sufficient heat without auxiliary heat sources in areas having high heat load demands in winter, and energy conservation is realized.

Description

technical field [0001] The invention belongs to the field of central air conditioning, in particular to a double-system heat pump roof unit. Background technique [0002] Roof top unit is a whole air system unit type overall unit in the field of central air conditioning, which integrates refrigeration, heating, air supply, air purification, and electrical control. It has been widely used in theaters, shopping malls, restaurants, bars and other occasions in recent years. , but it is difficult for ordinary roof-top machines to meet the use requirements in northern my country where the demand for heating in winter is greater than the demand for cooling in summer; although some roof-top machines can heat in winter, the heating effect is not ideal, and with the drop of temperature, the heating The thermal capacity will also decline accordingly, but the thermal load will increase accordingly, resulting in insufficient heat. [0003] Heat pumps will have defrosting problems. Because...

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Problems solved by technology

[0002] Roof top unit is a whole air system unit type overall unit in the field of central air conditioning, which integrates refrigeration, heating, air supply, air purification, and electrical control. It has been widely used in theaters, shopping malls, restaurants, bars and other occasions in recent years. , but it is difficult for ordinary roof-top machines to meet the use requirements in northern my country where the demand for heating in winter is greater than the demand for cooling in summer; although some roof-top machines can heat in winter, the heating effect is not ideal, and with the drop of temperature, the heating The thermal capacity will also decay, but the thermal load will increase, resulting in insufficient heat

[0003] Heat pumps will have defrosting problems. Because the roof machine directly exchanges heat between Freon and the air, the conventional roof machine generally absorbs heat from the casing or the room when defrosting, which has the disadvantages of long defrosting time and lowering the indoor temperature.

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