Control method and device for air volume of air conditioner

Abstract

The invention discloses a control method for an air volume of an air conditioner. The method comprises when operation of the air conditioner is detected, monitoring operation conditions of respective fans of the air conditioner in real time, obtaining operation parameters of the respective fans of the air conditioner, electromotor frequency values corresponding to the respective fans of the air conditioner and air volumes of respective air ducts, monitoring an indoor-outdoor air pressure difference in a working space of the air conditioner in real time, comparing a size relation between the indoor-outdoor air pressure difference and a preset air pressure, judging a size relation between the indoor-outdoor air pressure difference and the preset air pressure, and adjusting electromotor frequencies of the fans of the air conditioner in combination with the operation parameters of the respective fans of the air conditioner so as to control the air volume of the air conditioner. The invention further discloses a corresponding device based on the control method for the air volume of the air conditioner. The linkage frequency converting control between the air output of an air supply fan and a fresh air fan is realized while dynamic balance of the air volume is ensured, reduction of the service life of the fan caused by abnormal air pressure is prevented, and therefore, energy waste of the air conditioner is further reduced.

Description

technical field [0001] The invention relates to the field of central air conditioning, in particular to a method and device for controlling the air volume of an air conditioner. Background technique [0002] The total energy consumption of buildings accounts for 30% of the total energy consumption of the society, the energy consumption of central air-conditioning accounts for 65% of the total energy consumption of buildings, and the energy consumption of central air-conditioning refrigeration accounts for about 70% of the energy consumption of air-conditioning systems in southern China. Poorness directly affects the health of indoor personnel, and outdoor fresh air consumes a lot of energy; in order to create a healthy and comfortable indoor environment, the existing air-conditioning air supply and fresh air volume control methods are mainly calculated and controlled according to the real-time number of people in the area. The motor frequency of the air-conditioning air supp...

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Problems solved by technology

[0002] The total energy consumption of buildings accounts for 30% of the total energy consumption of the society, the energy consumption of central air-conditioning accounts for 65% of the total energy consumption of buildings, and the energy consumption of central air-conditioning refrigeration accounts for about 70% of the energy consumption of air-conditioning systems in southern China. Poorness directly affects the health of indoor personnel, and outdoor fresh air consumes a lot of energy; in order to create a healthy and comfortable indoor environment, the existing air-conditioning air supply and fresh air volume control methods are mainly calculated and controlled according to the real-time number of people in the area. The motor frequency of the air-conditioning air supply fan and fresh air fan is adjusted in equal proportion (that is, proportional relationship), but it does not take into account that the return air fan is usually operated at power frequency. This method does not really adjust the air volume on demand. , it is also easy to cause a mismatch between the air volume of the supply air fan and the sum of the air volume of the fresh air fan and the return air fan, which will eventually cause abnormal air pressure and reduce the life of the fan, and will also cause the air conditioner to fail to maintain a slight positive pressure in the work space. waste of energy

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