A dehumidifying fresh air unit with multiple condensers connected in parallel and an air conditioning method

Abstract

The invention provides a dehumidification fresh air unit with multiple condensers connected in parallel and an air conditioning method, wherein the dehumidification fresh air unit includes an air supply channel, an exhaust air channel, and an outdoor unit; a fresh air damper, a first heat exchange Heater, reheater, and air blower; a second heat exchanger and an exhaust fan are provided at the exhaust air channel; an auxiliary heat exchanger connected in parallel with the second heat exchanger and reheater is provided at the outdoor unit, and the air supply channel There is a return air bypass valve between the exhaust air channel. The second heat exchanger of the present invention is used as a condenser during refrigeration, and the indoor exhaust air is used to condense the refrigerant; when the heating is at low temperature, the internal circulation mode is started, and the outdoor unit can be turned on to quickly increase the indoor ambient temperature; in the external circulation mode, the second The heat exchanger is used as an evaporator, the refrigerant absorbs the heat of the indoor exhaust air, and the refrigerant evaporates, which increases the evaporation pressure of the heating system and the heating capacity of the unit, reduces the power consumption of the unit and avoids the risk of frosting of the unit.

Description

technical field [0001] The invention relates to the technical field of air conditioning and energy utilization, in particular to a dehumidifying fresh air unit with multiple condensers connected in parallel and an air conditioning method. Background technique [0002] In the existing technology, the condensation heat of the air conditioning unit can reach 1.15 to 1.3 times of the cooling capacity, and a large amount of condensation heat will be directly discharged into the atmosphere, and only rely on outdoor high-temperature air to condense it, not only the condensation effect is not good, Moreover, the emission of these heats increases the temperature of the surrounding environment, causing serious environmental heat pollution, and at the same time, this part of the heat will be lost in vain, resulting in a large waste of energy. If the condensation heat released by the air conditioning unit is recycled, and the indoor exhaust air temperature is lower in summer and higher ...

AI Technical Summary

Problems solved by technology

[0003] The use of condensation heat by traditional dehumidification fresh air fans 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

For this reason, 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. The problem is that 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

[0004] Furthermore, the traditional dehumidification fresh air fan cannot quickly and effectively raise the indoor temperature when heating

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