Evaporative-condensation direct-expansion cooling-air type ventilation and air-conditioning system for machine room of subway station

Abstract

The invention discloses an evaporative-condensation direct-expansion cooling-air type ventilation and air-conditioning system for a machine room of a subway station. The system comprises a ventilation power system and an evaporative-condensation direct-expansion cooling-air type air-conditioning unit for the machine room of the subway station mounted to the region of the machine room of the subway station. The evaporative-condensation direct-expansion cooling-air type air-conditioning unit for the machine room of the subway station is used for controlling ventilation and refrigeration of the system. The ventilation and air-conditioning system operates according to demand of indoor load and switches different operating modes, thereby fulfilling the purposes of high efficiency and energy conservation.Without occupying civil-engineering underground tunnels and acquiring cooling towers, the system does not influence surrounding environment and daily lives of nearby residents because positions of the ground are occupied by cooling towers, thereby making a harmonious environment.

Description

technical field [0001] The invention relates to a ventilation and purification air-conditioning system for subway stations and underground spaces, in particular to an evaporation-condensation direct-expansion cold-air ventilation and air-conditioning system for machine rooms in subway stations. Background technique [0002] The ventilation and air conditioning of traditional subway stations adopts the system of "water-cooled chiller + cooling tower + combined air conditioning unit". As well as disturbing residents, subway stations are mostly built in prosperous urban areas with high population density, and cooling towers are installed on the ground in this area to destroy the urban landscape and affect the daily life and rest of nearby residents; second, the water-cooled chillers in the traditional system The required chilled water pump and its piping system, cooling water pump and its piping system occupy a large area of ​​the machine room and increase the investment in civ...

AI Technical Summary

Problems solved by technology

[0002] The ventilation and air conditioning of traditional subway stations adopts the system of "water-cooled chiller + cooling tower + combined air conditioning unit". As well as disturbing residents, subway stations are mostly built in prosperous urban areas with high population density, and cooling towers are installed on the ground in this area to destroy the urban landscape and affect the daily life and rest of nearby residents; second, the water-cooled chillers in the traditional system The required chilled water pump and its piping system, cooling water pump and its piping system occupy a large area of ​​the machine room and increase the investment in civil engineering; third, the traditional "water-cooled chiller + cooling tower + combined air conditioning unit" system needs to go through five cycles and four cycles Only heat exchange can discharge the heat and humidity load in the air to the outside, the number of heat exchanges is large, the heat exchange attenuation is large and fast, and the overall energy efficiency of the system is low

Although this technical solution solves the problem that multiple cooling towers need to be built in the construction of the ventilation and air-conditioning system of urban rail transit underground stations, and the refrigeration unit of the ventilation and air-conditioning system is built into the system, it still needs to build multiple air shafts to realize this technical solution. Occupies a large amount of ground space, and at the same time, this scheme also fails to overcome the problems of complex heat exchange process, large and fast heat exchange attenuation, and low overall energy efficiency of the system during the operation of the subway station ventilation and air conditioning system

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