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 acquiring the user-set target temperature Ts, target relative humidity φs, indoor ambient temperature Tin and indoor relative humidity φ, when the target temperature difference E is less than or equal to the first preset temperature difference E1, and the indoor relative humidity φ is greater than Or equal to the first preset relative humidity φ1 or the difference Δφ between the indoor relative humidity φ and the target relative humidity φs is greater than or equal to the preset relative humidity difference φ2, the air conditioner enters the ultra-low sensible heat high latent heat load zone mode, and controls the air conditioner The compressor runs at low frequency, controls the upper fan to continue running at the low wind speed, controls the lower fan to stop running or continues to run at the low wind speed, controls the lower evaporator to block the refrigerant, and makes the refrigerant flow from the upper evaporator pass. By adopting the invention, the latent heat output of the compressor at low frequency operation can be increased, the sensible heat output can be reduced, and constant temperature dehumidification can be realized.

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...

AI Technical Summary

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 evaporation temperature to be close to the dew point temperature or even greater than The dew point temperature causes the latent heat capacity of the air conditioner to be 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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