한국태양에너지학회:학술대회논문집

The Korean Solar Energy Society (한국태양에너지학회)
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Practical Control Scheme of the Variable Speed Refrigeration System

  • Agung, Bakhtiar (Dept. of Refrigeration and Air-conditioning system, Graduated school, Pukyong National University) ;
  • Fatkhur, Rokhman (Dept. of Refrigeration and Air-conditioning system, Graduated school, Pukyong National University) ;
  • Kim, Hong-Sik (R&D Center of Kemtech Co.) ;
  • Choi, Kwang-Hwan (Dept. of Refrigeration and Air-conditioning system, College of Mechanical Engineering, Pukyong National University)
  • Published : 2011.04.07
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Abstract

With the improvement of standard of manufacturing process, oil cooling unit for manufacturing machine has been developed. A control system must be designed in order to keep oil temperature of the machine within a very restricted range and also to reduce energy consumption. In order to get the low deviation of the controlled temperature and the low efficiency, the on/off control scheme is gradually being replaced by a variable speed refrigeration system (VSRS) with an inverter driven compressor over recent decades. This paper gives the flowchart to control the compressor speed and also the electronic expansion valve (EEV) aperture in oil cooling unit refrigeration system using R22 as the refrigerant. This control scheme has already tested in experiment apparatus with room temperature condition constant at $25^{\circ}C$ and variable load condition at 4kW, 6kW, 7kW, 8kW and 10kW.

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