Investigation on Chiller Replacement of Water-Cooled Screw Chillers
Date Issued
2014
Date
2014
Author(s)
Hwang, Hung-He
Abstract
Energy consumption is the main cause of global warming. Efficient energy design and control can reduce carbon dioxide emission and also enhance company’s competitive edge. How to integrate energy control while maintain a secure, safe, hygienic building environment is an important topic for many companies. In recent years, new chillers are designed based on Chinese National Standards (CNS). However, few studies focus on evaluating the energy consumption and performance for existing chillers. In most cases, existing chiller is replaced when it’s either malfunctioned or at the end of its life cycle. Presently, with rising domestic energy cost and environment protection awareness, it is important to evaluate an appropriate timing for chiller replacement considering both performance efficiency and operation cost. The purpose of this study is to develop an empirical formula to determine the timing for chiller replacement.
Air conditioners are the highest power consuming appliance in a building. In this study, the optimum operation efficiency of screw chillers is evaluated to determine the timing for chiller replacement based on system’s initial cost, operation cost, and maintenance cost. According to chiller’s energy consumption and COP (Coefficient of Performance), the present value in each operation stage is used to generate the increasing electricity cost. Also, the increasing electricity cost from one-year operation (N=1) to five-year operation (N=5) are compared with chiller’s present value.
The study concludes that the timing for chiller replacement is when increasing electricity cost equals to chiller’s present value, it provides users and owners a convenient way to determine an appropriate timing for chiller replacement. Inappropriate timing of chiller replacement usually results in additional cost for investors. Therefore, an early decision methodology will certainly lead to better economic returns, and in the same time reduce the carbon dioxide emission and lower the electricity cost.
Subjects
主機汰換時機
攤提
螺旋主機
CO2減量
節能
SDGs
Type
thesis
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