PERFORMANCE OF THE MINIATURE ICE SKATING COMPRESSION REFRIGERATION SYSTEM WITH TXV AND CAPILER EXPANSION

Abstract

Vapor compression cycle cooling system are the widely used as refrigeration system machines nowaday, with the main components are compressors, condensers, evaporators and expansion devices (trottling devices). Expansion valves used on these system are many types, but the most often found in the field are capillary type and thermostatic expansion valve (TXV). Ice Skating is one application of vapor compression refrigeration system where the evaporator is used to freeze water for ice skating areas. In this study the method used to assess the performance of refrigeration / cooling systems in the prototype Ice Skating machine is to compare systems that use a type of thermostatic expansion valve (TXV) and capillary pipe.The purpose of this research is to obtain the most effective ice skating cooling system miniature based on the performance of the refrigeration/cooling system by comparing the system using a type of thermostatic expansion valve (TXV) and capillary pipe.
From the calculation results, for miniature ice skating cooler using TXV the
value of the refrigeration (qe) effect is 162.64 kJ / kg, condenser capacity
(qc) 208.86 kJ / kg, compressor capacity 50.43 kJ / kg, COP actual  3.53,
and system efficiency 65% . Whereas the system using capillary pipes
obtained the value of refrigeration effect (qe) 171.12 kJ / kg, condenser
capacity (qc) 211.03 kJ / kg, compressor capacity 46,05 kJ / kg, COPa 4.39 and efficiency of 83.47%. The time needed to reach the product/water
temperature cooled at -13 oC are 280 and 325 minutes for useing TXV and capillary, respectively.
 
Keywords: Ice Skating, TXV, Capillary pipe, COP