Temperature control method for detachable air-conditioning equipment

Abstract

The invention relates to a temperature control method for detachable air-conditioning equipment, which comprises the following steps of: establishing an air-conditioning system model and a heat absorption model of each evaporator to obtain a system state equation, decomposing the equation by combining the optimum algorithm with Schur to obtain a linear matrix inequation, and operating to obtain the optimal gain of a controller; inputting each indoor temperature and a set value thereof, and each evaporator temperature and superheat degree thereof to the controller, so that the controller performs computation according to the optimum gain, the air conditioning system model and the heat absorption model of each evaporator to obtain the rotate speed of a compressor, the rotate speed of an outdoor fan, the opening of each expansion valve and the rotate speed of each indoor fan so as to control the rotate speed of the compressor, the rotate speed of the outdoor fan, the opening of each expansion valve and the rotate speed of each indoor fan of the detachable air-conditioning equipment; and connecting the output end of the controller to each evaporator to feed back the temperature and the superheat degree of each evaporator and the indoor temperature to the controller, so that the controller controls the indoor temperature in real time.

Description

technical field [0001] The present invention relates to a temperature control method for a separate air conditioner, and more specifically, relates to a method for controlling the temperature of at least one controller, at least one compressor connected to the controller, an expansion valve, an outdoor heat exchanger, and an indoor heat exchanger. A method for controlling the temperature of a split air conditioner in a split air conditioner. Background technique [0002] Variable frequency multi-connected air conditioner (VRF, Variable Refrigerant Flow), such as one-to-many air conditioners, is composed of one or more outdoor units and multiple indoor units, because it uses a shunt tube combined with frequency conversion control and electronic expansion valve To achieve the distribution of refrigerant flow, that is, the number of indoor units that can be turned on according to the demand, the advantage of determining the compressor speed to provide the refrigerant flow requi...

AI Technical Summary

Problems solved by technology

[0003] With the appearance of frequency conversion compressors, the temperature control of separate air conditioners is not as simple as the early stand-alone air conditioners. Since the separate air conditioners are single or multi-input to many output, therefore, for one-to-many air conditioners In terms of air conditioners (one outdoor unit, multiple indoor units) or many-to-many air conditioners (multiple outdoor units, multiple indoor units), more parameters need to be controlled to control the temperature of the separated air conditioner. In the known technology, the controller of the split air conditioner is to control the compressor speed and the opening of the expansion valve with the concept of parallel structure to control the temperature of the split air conditioner. The known temperature control method of the split air conditioner (such as the United States US6854285B2 and US2009 / 0019872A1 patent cases), please refer to figure 1 As shown, this method is to firstly control the compressor speed by different indoor temperature differences, and then determine the opening of the electronic expansion valve according to empirical rules, and establish an experimental database to store data in a table form, which can be used for subsequent temperature control through table lookup. However, in the case of one-to-one, it is not a big problem to create a table and look up the table through the rule of thumb, but in the case of one-to-many, due to too much data, the content of the table is complicated, so the difficulty of executing the table lookup increases Many and time-consuming, in addition, the steady-state error of the indoor temperature is also difficult to control

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