A dual-duct air conditioner and its dehumidification method and system

Abstract

The invention relates to the field of refrigeration equipment, and discloses a double-air-duct air conditioner and a dehumidification method and system thereof. In the present invention, by obtaining the target temperature Ts and the target relative humidity φs set by the user, and obtaining the indoor ambient temperature Tin, the outdoor ambient temperature Tout and the indoor relative humidity φ in real time, it is judged whether the air conditioner meets the load of ultra-low sensible heat and high latent heat Zone dehumidification mode, low sensible heat and high latent heat load zone dehumidification mode, and medium and high sensible heat load zone dehumidification mode parameter conditions, and control the speed of the upper fan and lower fan in a certain dehumidification mode, thus realizing three dehumidification modes Switch between each other, especially when the dual-duct air conditioner operates in the dehumidification mode of the ultra-low sensible heat and high latent heat load area, control the upper fan and the lower fan to run at the lowest speed at which the fan can reliably operate, which greatly reduces the evaporation temperature of the evaporator , Improve the dehumidification capacity of the air conditioner, increase the latent heat output of the compressor during low-frequency operation, reduce the sensible heat output, and achieve constant temperature dehumidification.

Description

technical field [0001] The invention relates to the field of refrigeration equipment, in particular to a double-duct air conditioner and its dehumidification method and system. Background technique [0002] The total cooling capacity Q output by the air conditioner during refrigeration or dehumidification is always composed of sensible heat Q sensible and latent heat Q latent. The load during room cooling refers to the sensible heat W sensible and latent heat W latent required to lower the current temperature and humidity to a certain set temperature and humidity. The sensible heat output by the air conditioner is used to reduce the temperature of the user's room, and the latent heat is used to reduce the relative humidity of the room. [0003] figure 1 It is a high-humidity city, the typical city is Guangzhou, a typical house type with a fixed area, when the temperature is set at 27°C and the relative humidity is 50%, during the period from May 1st to September 30th every...

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Problems solved by technology

On a certain day, the sensible heat load of the room is 800W, and the latent heat load is 600W. If the sensible heat component of the output capacity is 800W, and the latent heat component is 200W, the temperature of the room can only be controlled to the temperature set by the user at 27°C If the latent heat component of the output capacity is 600W, the sensible heat component is 1400W. At this time, the humidity can be controlled to about 50%, but the room temperature will be significantly lower than 27°C, causing The user is obviously cold

[0005] figure 2 When cooling or dehumidifying the air conditioner, the output load of the air conditioner is divided into four zones according to the outdoor ambient temperature, indoor ambient temperature, indoor relative humidity, and set temperature. figure 2 The area indicated by the middle mark A is the medium and high sensible heat load area, and the air conditioner is mainly for cooling, supplemented by dehumidification; figure 2 The area indicated by the middle mark B is a low sensible heat and low latent heat load area, and the cooling and dehumidification requirements of the air conditioner are small; figure 2 The area indicated by the middle mark C is a low sensible heat and high latent heat load area. Extend the gear of the indoor fan down a few gears (reduce the speed) to increase the latent heat component of the air conditioner and reduce the sensible heat component. Although full coverage cannot be achieved, the Compared with the original wind speed gear, the coverage area has been significantly improved; figure 2 The area indicated by the mark D is an area with ultra-low sensible heat and high latent heat load, which is also an area that cannot be covered by existing air-conditioning products

[0006] The reason why there is an ultra-low sensible heat load and an ultra-high latent heat load, and the sensible heat output and latent heat output of the air conditioner cannot meet the dehumidification demand is that when the air conditioner compressor operates at low frequency, the evaporator area is too large, causing the temperature to be close to the dew point or even greater than the dew point temperature, the latent heat capacity of the air conditioner is almost 0, and the dehumidification capacity is lost

[0007] In order to meet the room load of the area where the latent heat and sensible heat of the air conditioner are cooling, the best solution is the one without cooling and dehumidification, which can control the room temperature and humidity to the user's comfortable temperature and humidity, but does not cause cooling and dehumidification. The cost of the whole machine has risen sharply, and the energy efficiency has declined. In fact, there are few air-conditioning products that do not cool down and dehumidify in the market.

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