Pengujian Perbandingan Unjuk Kerja antara Sistem Air-Cooled Chiller Menggunakan Refrigeran R-22 dengan Refrigeran HCR-22 pada Temperatur Keluar Kondensor 28 s.d. 29 °C, dan Analisa Pressure Drop di dalam Pipa pada Evaporator

Abstract

Compressor represents heart of vapour compression system and activator of burden to refrigeration industry. A compressor has some characteristics, and from characteristics of the compressor influence characteristics of performance system of vapour compression (Coefficient of Performance). The important things from characteristic of performance system are characteristics of capacities refrigeration, and characteristic of power compressors. For cooler machine application during regular activity, by increasing refrigeration load, evaporator outlet temperature will go up, so that will influence some characteristic of performance, from vapour compression system like characteristic of refrigeration of capacities, power of compressor, and other characteristic like characteristic of mass flow, heat transfer in condenser and coefficient of performance. Each of refrigerant type has characteristic of thermodynamic which different each other and this research use two kind of refrigerant which is refrigerant HCR 22 hycool with 0,97 propane, 0,0151 butane, 0,0111 isobutane composition which compare with R22. When this two type refrigerant is being compare on variation of temperature outlet evaporator, and keep the outlet temperature of condenser steady on 28 and 29°. So we have the result of this experiment, which is 30% higher on refrigeration of capacities, 8% higher of COP, for 8% lowest of electricity power than R 22. Beside that we also take conclusion for increasing temperature of condenser outlet, where it will increase the power of compressor and electricity power, but refrigeration capacity and COP will decrease. Pressure drop is taking effect on actual compressi siclus in evaporator pipe. Pressure drop size is depend on three kind of effect, first is effecting by shear stress of wall, second pressure drop effecting by momentum or speed accelerate and decrease, and the third is pressure drop effecting by hidrostatic force. From this experiment we conclude pressure drop teoriticly have 30 % lowest price than actual pressure drop.