Extraction system of centrifugal chiller unit
A centrifugal chiller with low-pressure refrigerant (such as R123) will form some low-pressure zones below atmospheric pressure inside the chiller during operation. Non condensable gases in the air, such as water vapor and nitrogen vapor, may seep into these low-pressure areas and accumulate in the condenser. If these non condensable gases are not removed, the condenser will lose its efficient condensing ability and also increase the condensing pressure of the unit.
To safeguard the excellent performance of the chiller, a low-pressure centrifugal chiller requires the use of an exhaust system. This system is like a guardian deity, standing outside the chiller, silently guarding the purity and efficiency inside the unit. Its mission is to remove non condensable gases that infiltrate the unit and provide a refreshing working environment for the chiller.
According to functional division, the exhaust device can be divided into the following subsystems: refrigeration subsystem, exhaust chamber, exhaust subsystem, carbon box, and regeneration subsystem.
The exhaust device starts operating after its condensing unit (i.e. refrigeration subsystem) is started. The condensing unit is used to condense refrigerant vapor from the chiller unit in the extraction chamber. It reduces the temperature and pressure of the refrigerant in the extraction chamber, thereby allowing the refrigerant vapor (containing a small amount of non condensable gas) in the condenser of the chiller unit to be drawn into the extraction chamber. After entering the suction chamber, the refrigerant vapor is condensed into liquid and drips to the bottom of the suction chamber, while non condensable gases accumulate in the upper part of the suction chamber. The bottom float valve controls the amount of liquid refrigerant remaining in the suction chamber, and returns the refrigerant liquid to the condenser of the chiller unit through a return pipe equipped with a dry filter. Non condensable gases are left in the pumping chamber and continuously accumulate.
With the increase of non condensable gases, the heat transfer efficiency of the evaporator coil in the exhaust system decreases, resulting in a decrease in the suction temperature of the refrigeration compressor in the exhaust system. When the vacuum subsystem detects the presence of non condensable gases in the vacuum chamber, the vacuum compressor, vacuum solenoid valve, and exhaust solenoid valve are opened. The non condensable gas is evacuated by the compressor and output to the carbon box through the pipeline. Then, it is effectively filtered by special carbon in the carbon box. Before the non condensable gas is discharged through the exhaust solenoid valve, the refrigerant molecules in it are retained and returned to the unit.
A resistance heater is also installed in the carbon box, which can periodically "regenerate" the carbon bed and send the filtered refrigerant back to the chiller unit. A pressure relief valve has been installed on the outlet pipeline of the carbon box to prevent excessive pressure in the carbon box. A temperature sensor is also installed at the top of the carbon box shell, so that the controller can monitor the temperature of the carbon bed. This temperature can control the regeneration subsystem and avoid overheating of the carbon box.
Under this series of precise operations, the exhaust device successfully guarded a pure world for the chiller. Those once arrogant and domineering non condensable gases, under the powerful attack of the exhaust device, can only be captured obediently and turned into pure gases for discharge. And the cold water host can also operate in a more efficient and stable state, bringing a continuous stream of coolness and comfort to our lives.
Lithium bromide solution manufacturer
About us
Flier Refrigeration Engineering Technology Co., Ltd is a professional technical service enterprise integrating central air-conditioning host sales, spare parts sales, unit repair and maintenance.
Factory located in Zhenjiang, Jiangsu, covering an area of 25,000 square meters ,and has been built with 1 R&D center, 1 pilot plant, 3 An innovative production, learning, and research base composed of a professional production workshop and its corresponding infrastructure. At present, the company has become a well-known technical service provider in the field of central air conditioning in China.
The company's main business scope includes: central air-conditioning maintenance, cleaning and technical services; cooling tower and fan coil cleaning and maintenance services; custom processing of lithium bromide solution; sales of lithium bromide solution special impurity separators; central air-conditioning host and various zero Sales of accessories; installation and sales of central air conditioning systems, etc.
Contact us
Ms. Lillian GUO
Zhenjiang FLIER Refrigeration Engineering Technology Co., Ltd
Jiangsu, China
Tel: + 86 15358588768(Whatsapp)
Wechat：15358588768
E-mail: mdguolijuan@zjflier.com
