Decentralized Split Evaporative Condensation Refrigeration System for Metro Stations

Abstract

[Objective] Evaporative condensation refrigeration systems are characterized by energy efficiency, water conservation, space savings, not requiring ground cooling tower installations. The application of evaporative condensation refrigeration system in metro projects is increasing in recent years. Therefore, there is a need to analyze and study the split evaporative condensation refrigeration systems for metro stations. [Method] The above system and its refrigeration principles are introduced. Taking a metro station in Beijing as example and considering its actual conditions, the applicability, type selection and configuration, equipment layout, and system energy efficiency of the evaporative condensation refrigeration system are analyzed. Common issues in engineering application of evaporative condensation systems such as fire condition, piping length, water quality treatment, waterproofing and corrosion prevention are addressed. [Result & Conclusion] Compared to conventional chilled water screw unit refrigeration systems, the split evaporative condensation refrigeration system has certain energy-saving advantages. During fire conditions, it is essential to ensure that the combustion performance of the embedded evaporative condensation device in the wind wall reaches Class A non-combustibility level. Effective fire sealing measures should be implemented at the installation location. Adopting effective water treatment measures will reduce the impact of limescale condensation on the efficiency of the evaporative condensation refrigeration system. Piping lengths between units should be controlled within a reasonable range to minimize the impact on the refrigeration capacity and energy efficiency ratio of the system. Waterproofing treatment is recommended for the windward side walls and the ground around the evaporative condensation device.

Keywords

• metro
• evaporative condensation
• refrigeration system