Heat pump air-conditioning system

Abstract

The invention discloses a heat pump air-conditioning system which comprises a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a throttling device, an outdoor environmental temperature sensor, an outdoor pipe temperature sensor and a controller, wherein the outdoor heat exchanger is provided with at least two flow channels which are independent from each other; and a switch valve which is used for cutting off the flow channel is arranged on each of the flow channels respectively. By adopting the mode that the outdoor heat exchanger is divided into a plurality of flow channels and the on-off of each flow channel is controlled, the defrosting and heating of the air-conditioning system are carried out at the same time, a room can be heated continuously during the defrosting process, thereby ensuring that continuous hot air is blown into the room while defrosting, the room is more uniform in temperature field and high in comfort, and moreover the consumption on operation of an air-conditioner is saved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a heat pump air conditioning system. Background technique [0002] The outdoor air-cooled heat pump air-conditioning system is prone to frost on the outdoor heat exchanger during low-temperature heating, which makes the heat exchange effect on the outdoor side worse, resulting in poor indoor heating effect of the system. When the frosting reaches a certain level, the heating effect of the indoor mechanism will become very poor, and even cold wind will be blown. At this time, it is necessary to remove the frost formed on the outdoor heat exchanger to restore the heat exchange effect of the outdoor unit and improve the heating effect of the indoor unit. [0003] At present, the air-cooled heat pump air-conditioning system generally switches to cooling mode through the four-way valve reversing to defrost the outdoor heat exchanger. For the control of air-conditioning defr...

AI Technical Summary

Problems solved by technology

This method is relatively simple to control and widely used, but it has the following defects: the defrosting mode that enters the defrosting operation at regular intervals cannot determine the actual frosting situation of the outdoor unit, and only mechanically switches to cooling at regular intervals run to defrost

Although this defrosting method solves the above-mentioned defects of power consumption and endless defrosting, both of these two methods need to be switched to refrigeration through the four-way valve to defrost the outdoor heat exchanger, that is to say When defrosting, the indoor heating should be stopped, which directly affects the indoor temperature. The indoor temperature fluctuates greatly and the comfort is poor.

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