Condenser-Evaporator Approach Temperatures and their Influences on Energy Performance of Water Cooled Chillers

Suamir, I Nyoman and Baliarta, I Nyoman Gede and Arsana, Made Ery and Negara, I Putu Sastra (2015) Condenser-Evaporator Approach Temperatures and their Influences on Energy Performance of Water Cooled Chillers. In: The 14th International Conference on QIR (Quality in Research), 10-13 August 2015, Mataram, Lombok, Indonesia.

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Abstract

This paper presents numerically and experimentally study of the effect of approach temperatures to temperature and energy performances of AC system type water-cooled chillers. Performance characteristics of the AC systems were analyzed at various approach temperatures and different refrigerants including refrigerant R-22, R-134A, R-407C and R-410A. Four numerical models have been developed in EES (Engineering Equations Solver) program to simulate the performances. The models were validated using data obtained from experimental investigation directly in hotel industries. The results showed that the increase of condenser and evaporator approach temperatures could cause the AC system to operate at a lower performance. The increase of condenser approach temperature by 1 K could reduce coefficient of performance (COP) of about 3.45%, 3.4%, 3.3% and 3.6% respectively for AC system with R-22, R-134A, R-407C and R-410A. This paper also presents the characteristic of condenser and evaporator approach temperatures that can provide indication the necessity of AC system maintenance in order to keep the best possible performance.

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