Air conditioner, its control method, and control device

Abstract

The invention discloses an air conditioner, and a control method and a control device thereof. The method comprises: after a compressor of the air conditioner enters an operating state, detecting discharge temperature Tp of the compressor, evaporation temperature Te, condensing temperature Tc, and load Q of the compressor in real time; according to the discharge temperature Tp and the condensing temperature Tc of the compressor, obtaining current discharge superheat Tdisc of the compressor, and according to the evaporation temperature Te, the condensing temperature Tc, the load Q, and a preset discharge superheat formula, obtaining current optimal discharge superheat Topt of the compressor; and obtaining the difference [delta]T=Tdisc-Topt between the current discharge superheat Tdisc and the current optimal discharge superheat Topt, and according to the difference [delta]T to control opening of the electronic expansion valve of the air conditioner. The method prevents a dry pipe of a flooded evaporator, and improves heat exchange effect of the evaporator. On the premise of ensuring reliable operation of a unit, the method makes the unit in a most efficient operating state.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, in particular to an air conditioner control method, a control device and an air conditioner with the control device. Background technique [0002] In the current air conditioner system, the electronic expansion valve, as one of the four major components of the chiller, plays a vital role in the reliability and energy saving of the chiller. At present, the electronic expansion valve commonly used in flooded or falling film units The adjustment method is exhaust superheat control. [0003] In the related art, the exhaust superheat control system is composed of an electronic expansion valve, a pressure sensor, a temperature sensor and a controller. When the exhaust superheat control system is in working condition, the pressure sensor transmits the condenser inlet pressure P1 and the temperature sensor transmits the compressor exhaust superheat to the controller, and the controller ...

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Problems solved by technology

[0004] The current problem is: although the electronic expansion valve has the characteristics of fast response and action speed and precise adjustment, but the single superheat adjustment is prone to problems such as low pressure and liquid, which will affect the reliability and service life of the compressor.

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