Ultra-efficient direct expansion heat recovery type dehumidification fresh air machine

Abstract

The invention provides an ultra-efficient direct expansion heat recovery type dehumidification fresh air machine which comprises an air supply channel of outdoor air, an exhaust channel of indoor air, and an outdoor unit. The air supply channel is provided with a first heat exchanger, a third heat exchanger and a reheating condenser which have the condensation and evaporation functions. The exhaust channel is provided with a second heat exchanger which has the condensation and evaporation functions. The second heat exchanger and the third heat exchangerare further connected with a fourth heat exchanger. In the refrigerating process, a high-temperature refrigerant is condensed through indoor low-temperature exhausted air, the condensation temperature of the fresh air machine is reduced, and the sensible heat energy of the indoor exhausted air is utilized. In the heating process, indoor high-temperature exhausted air serves as a heat source, the evaporation temperature of the fresh air machine is increased, due to the facts that the dew point temperature of the indoor exhausted air is high, and the evaporation temperature is lower than the dew point temperature of the exhausted air, so that condensed water is separated out of the surface of the second heat exchanger, and at the moment, both the sensible heat energy of the indoor exhausted air and the latent heat energy of the indoor exhausted air are recycled.

Description

technical field [0001] The invention relates to the technical field of air conditioning and energy utilization, in particular to an ultra-high-efficiency direct expansion heat recovery type dehumidification fresh fan. Background technique [0002] Usually, the evaporator of the air conditioning unit is designed according to the cooling condition in summer. However, the calculated heat load during heating is often much smaller than the calculated cooling load during cooling. Under normal circumstances, when heating, the energy efficiency ratio of the unit is often not good, so the design of the evaporator needs to take into account both cooling and heating. [0003] In addition, the condensation heat of the air-conditioning unit can reach 1.15 to 1.3 times the cooling capacity. A large amount of condensation heat is directly discharged into the atmosphere, and only relying on outdoor high-temperature air to condense it is not only ineffective, but also the heat dissipation wi...

AI Technical Summary

Problems solved by technology

[0002] Usually, the evaporator of the air conditioning unit is designed according to the cooling condition in summer. However, the calculated heat load during heating is often much smaller than the calculated cooling load during cooling. Under normal circumstances, when heating, the energy efficiency ratio of the unit is often not good, so the design of the evaporator needs to take into account both cooling and heating

[0003] In addition, the condensation heat of the air-conditioning unit can reach 1.15 to 1.3 times the cooling capacity. A large amount of condensation heat is directly discharged into the atmosphere, and only relying on outdoor high-temperature air to condense it is not only ineffective, but also the heat dissipation will cause The temperature of the surrounding environment will rise, causing serious environmental thermal pollution, and at the same time, this part of the heat will be lost in vain, which will cause a large waste of energy

[0004] The use of condensation heat by traditional fresh air dehumidifiers is mainly to reheat the fresh air after cooling and dehumidification, which has recovered the condensation heat to a certain extent, but still most of the condensation heat is discharged to the outdoor air. Rely on the outdoor air-cooled condenser to take away this part of the heat. In addition, when heating, because the outdoor temperature is very low, it often cannot meet the heating demand, and frost often occurs

Some scholars place the outdoor air-cooled condenser on the indoor exhaust side. In winter, the exhaust air with a higher temperature in the room is used as the heat source of the unit, which solves the disadvantage of insufficient heating in winter, but brings a new problem. That is, in summer, the cooling capacity is difficult to meet the requirements, and it is far from enough to rely on indoor exhaust air as a cooling source

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