Evaporation condensation oilless air conditioning system and control method thereof

Abstract

The invention relates to an evaporation condensation oilless air conditioning system and a control method thereof. The system comprises a control device, a flue, and an evaporation cooling device and a direct expansion compressed air treatment device connected with the control device; an intake joint and an air supply joint are respectively formed in two ends of the flue; the direct expansion compressed air treatment device is positioned in the flue between the intake joint and the air supply joint; the air supply joint is used for communicating with a cold supply area; the direct expansion compressed air treatment device includes a magnetic suspension variable-frequency centrifugal compressor, an air filter device, a variable heat exchange area direct expansion evaporation device and an air power system respectively connected with the control device and positioned between the intake joint and the air supply joint in sequence; and the magnetic suspension variable-frequency centrifugal compressor, the evaporation condensation cooling device and the variable heat exchange area direct expansion evaporation device are annularly connected in sequence through pipes, valves and shunt liquid separation devices to form a circulating system. The system can realize ultralong-distance refrigeration system pipe connection.

Description

technical field [0001] The invention relates to the field of ventilation and air conditioning of subway stations and underground spaces, and more specifically, to an evaporative condensation oil-free air conditioning system and a control method thereof. Background technique [0002] In the traditional air-cooled direct expansion ventilation and air-conditioning system, the external unit is cooled by pure air-cooling. The energy efficiency of this traditional air-conditioning system is low, which is specifically reflected in: (1) the pure air-cooled cooling leads to low energy efficiency of cooling; (2) the use of The traditional screw, scroll, etc. need to lubricate the compressor with oil, which affects the heat exchange effect of the two devices, resulting in low energy efficiency; (3) The oil also affects the connection length of the internal machine and the external machine, resulting in limited placement of the internal and external machines It also affects energy effic...

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Problems solved by technology

[0002] In the traditional air-cooled direct expansion ventilation and air-conditioning system, the external unit is cooled by pure air-cooling. The energy efficiency of this traditional air-conditioning system is low, which is specifically reflected in: (1) the pure air-cooled cooling leads to low energy efficiency of cooling; (2) the use of The traditional screw, scroll, etc. need to lubricate the compressor with oil, which affects the heat exchange effect of the two devices, resulting in low energy efficiency; (3) The oil also affects the connection length of the internal machine and the external machine, resulting in limited placement of the internal and external machines also affects energy efficiency

[0003] The air-conditioning system composed of the traditional water-cooled cold water type magnetic levitation frequency conversion centrifuge unit + water-cooled terminal + cooling tower also has certain defects: first, the cooling tower occupies a certain position and is not suitable for occasions without cooling tower installation conditions, such as urban subway stations; The second is that this solution is not suitable for water-scarce regions because of the need for cooling; the third is that the air-conditioning system composed of the water-cooled cold water type magnetic levitation frequency conversion centrifuge unit + water-cooled terminal + cooling tower needs to go through five cycles and four heat exchanges. heat, the number of cycles and heat exchanges is high, the energy efficiency of the system is low, the equipment is complicated, and the farther the distance between the equipment, the more obvious the decline in energy efficiency

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