Variable air volume air conditioning unit and its control method

Abstract

The invention discloses a variable-air-volume air conditioning unit and a control method thereof, and relates to the technical field of refrigeration air conditioners. The variable-air-volume air conditioning unit comprises a first fan, a second fan, a heat exchanging mechanism, a first electric regulating air valve, a second electric regulating air valve, a third electric regulating air valve, afresh air inlet, a return air inlet, an exhaust air outlet, a supply air outlet, a first air volume sensor and a second air volume sensor; and one end of the third electric regulating air valve communicates with an inlet of the first fan, and the other end of the third electric regulating air valve communicates with an inlet of the second fan. According to the variable-air-volume air conditioningunit and the control method thereof, the supply air volume regulating range of the variable-air-volume air conditioning unit can be enlarged significantly, when the supply air volume required by an air conditioner variable-air-volume tail end device is extremely small, the supply air volume of the fans in the variable-air-volume air conditioning unit can still be close to the supply air volume required by the air conditioner variable-air-volume tail end device as far as possible, and thus operation economy of a variable-air-volume air conditioning system is improved significantly.

Description

technical field [0001] The invention relates to the technical field of refrigeration and air conditioning, in particular to a variable air volume air conditioning unit and a control method thereof. Background technique [0002] The air conditioning unit is the terminal equipment that undertakes the task of air treatment in the air conditioning system, and heat and humidity treatment of the air is one of the main tasks undertaken by the air conditioning unit. Conventional air conditioning units generally include a blower installed downstream of the air duct, and the upstream of the air duct includes a fresh air channel and a return air channel. A fresh air valve is provided at the air inlet of the fresh air channel, and a return air valve is provided at the air inlet of the return air channel. . The two airflows of the fresh air channel and the return air channel are merged in front of the air supply fan downstream of the air duct and after completing the processing function...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned conventional air-conditioning unit cannot accurately control the fresh air volume and return air volume through the air supply fan that sends the air into the room, and needs to set up a special exhaust fan to exhaust the air, resulting in complicated system cost and on-site installation control; When the air supply volume required by the variable air volume terminal device is extremely small, due to the minimum speed limit of the air supply fan itself, the air supply volume of the conventional air supply fan can only be reduced to about 20% of its full-load air supply volume, and the minimum air supply volume of the air conditioning unit The air supply volume may still be greater than the air supply volume required by the air conditioner's variable air volume terminal unit. At this time, it will cause problems such as excessive static pressure in the air supply pipe, increased noise in the air conditioner's variable air volume terminal unit, and unnecessary energy waste.

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