Experimental Analysis of the Performances of Unit Refrigeration Systems Based on Parallel Compressors with Consideration of the Volumetric and Isentropic Efficiency

Abstract

The performances of a refrigeration unit relying on compressors working in parallel have been investigated considering the influence of the compressor volumetric efficiency and isentropic efficiency on the compression ratio. Moreover, the following influential factors have been taken into account: evaporation temperature, condensation temperature and compressor suction-exhaust pressure ratio for different opening conditions of the compressor. The following quantities have been selected as the unit performance measurement indicators: refrigeration capacity, energy efficiency ratio (COP), compressor power consumption, and refrigerant flow rate. The experimental results indicate that the system refrigeration capacity and COP decrease with a decrease in evaporation temperature, increase of condensation temperature, and increase in pressure ratio. The refrigerant flow rate increases with the increase in evaporation temperature, decrease in condensing temperature and increase in pressure ratio. The compressor power consumption increases with the increase in condensing temperature and increase in pressure ratio, but is not significantly affected by the evaporation temperature.

A Critical Analysis of Natural Gas Liquefaction Technology

“…The MRC with pre-cooling fully absorbs the advantages of the cascade cycle and reduces the total power consumption by adding the pre-cooling link. Both APCI and Shell of the United States can adjust the amount of liquid refrigerant by controlling the temperature of the mixed refrigerant after pre-cooling, which greatly increases operation flexibility and boosts cooling efficiency [24][25][26].…”

Experimental Investigation of Regular or Wavy Two-Phase Flow in a Manifold

“…Gas-liquid two-phase flow has been common in many fields of materials science [1]. In particular, the phenomenon of uneven phase distribution commonly occurs in a gas-liquid two-phase flow.…”

Experimental Investigation of Coolant Side Characteristic on the Performance of Air-Cooled Condenser Structured by Horizontal Flattened Tube

“…Basically, the heat transfer coefficient and temperature distribution inside the tube are the main parameters that need to be considered. Circular cross-section tubes are utilized in most of these applications [9]. However, some different tube geometries need to be considered to obtain a clear understanding of the thermal performance and ideal operating conditions.…”