Multi-online system and control method for heating and throttling element of multi-online system

Abstract

The invention discloses a multi-online system and a control method for a heating and throttling element of the multi-online system. The method comprises the steps that when the multi-online system runs in a pure refrigerating or main refrigerating mode, the first temperature at the position of an outlet of a second heat exchange flow path of a first heat exchanger is obtained, the first saturation temperature corresponding to pressure at the position of the outlet of the second heat exchange flow path of the first heat exchanger is obtained, and the superheat degree is calculated according to the first temperature and the first saturation temperature; the second temperature at the position of an outlet of a first heat exchange flow path of a second heat exchanger is obtained, the second saturation temperature at the position of the outlet of the first heat exchange flow path of the second heat exchanger is obtained, and the supercooling degree is calculated according to the second temperature and the second saturation temperature; and the aperture of the heating and throttling element is adjusted according to the superheat degree and the supercooling degree. According to the method, the heating and throttling element can be adjusted according to the superheat degree and the supercooling degree, the aperture of the heating and throttling element is made to be optimal, and therefore the system can obtain the low exhaust temperature and good refrigerating effect and is high in energy efficiency.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling a heating throttling element in a multi-connection system and a multi-connection system. Background technique [0002] The multi-connected system has four modes: pure cooling, pure heating, main cooling and main heating. Among them, the main cooling mode and the main heating mode can use the condensation heat and evaporation heat of the system at the same time, which greatly improves the energy efficiency of the system. [0003] However, when the system is in pure cooling and main cooling mode, if the outdoor temperature and indoor temperature are relatively high, the evaporation temperature of the indoor unit is high, the cooling effect is poor, and the return air temperature of the cooling indoor unit is relatively high. As a result, the exhaust temperature and superheat of the compressor in the outdoor unit will increase accordingly, which in...

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Problems solved by technology

[0003] However, when the system is in pure cooling and main cooling mode, if the outdoor temperature and indoor temperature are relatively high, the evaporation temperature of the indoor unit is high, the cooling effect is poor, and the return air temperature of the cooling indoor unit is relatively high. As a result, the discharge temperature and superheat of the compressor in the outdoor unit will increase accordingly, which in turn will cause the risk of excessive discharge temperature in the system

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