An independent fresh air unit for urban rail transit vehicles

Abstract

The invention relates to an independent fresh air handling unit for urban rail traffic vehicles. The independent fresh air handling unit comprises a fresh air channel and an air exhaust channel, wherein the fresh air channel and the air exhaust channel are connected with a total heat exchanger for heat exchange and are mutually separated; the fresh air channel comprises a fresh air inlet air channel and a fresh air outlet air channel which communicate through the total heat exchanger; a precooling unit is arranged in the fresh air inlet air channel; a reheating unit is arranged in the fresh air outlet air channel; and an independent air-conditioner unit located between the precooling unit and the reheating unit is also arranged in the fresh air channel, and is used for performing heat exchange with entered fresh air. Compared with the prior art, the independent fresh air handling unit disclosed by the invention has the advantages that a gravity heat pipe heat exchanger is additionally arranged for precooling and reheating the fresh air based on the condition that cooling capacity (in summer) and heating capacity (in winter) in exhaust air are recycled by the total heat exchanger, so that the energy consumption of reheating is reduced; besides, the independent air-conditioner unit is also arranged, so that treatment can be directly performed on inlet air, and air supply can be directly performed without mixing return air with the inlet air; and the adjusting range of the fresh air capacity is increased, and air quality in the vehicles can be improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of air conditioning and ventilation systems for urban rail transit trains, in particular to an independent fresh air unit for urban rail transit vehicles. Background technique [0002] With the advantages of low-temperature air supply and no return air, independent fresh air units have been widely used in the construction field, but they are rarely used in urban rail transit vehicles. The fresh air units used in the existing urban rail transit vehicles recover heat from the fresh air, and then send it into the main air conditioning unit for heat and humidity treatment before supplying air, which does not realize the independent processing and supply of fresh air. [0003] Considering the problem of fresh air load, the fresh air volume in the air-conditioning system of the existing urban rail transit trains is relatively small, and the return air is usually mixed with the supply air, so it is easy to have ins...

AI Technical Summary

Problems solved by technology

[0003] Considering the problem of fresh air load, the fresh air volume in the air-conditioning system of existing urban rail transit trains is relatively small, and the supply air is usually mixed with return air, so it is easy to have insufficient fresh air volume during peak hours of traffic

Therefore, there has always been a contradiction between reducing the load of fresh air, increasing the volume of fresh air, and reducing energy consumption. The independent control of fresh air can better solve the above problems, but it has always been a bottleneck of the air-conditioning system of urban rail trains.

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