Optimisation of direct expansion (DX) cooling coils aiming to building energy efficiency

Article

Xia, L., Yang, T., Chan, Y., Tang, L. and Chen, Y.-T. 2015. Optimisation of direct expansion (DX) cooling coils aiming to building energy efficiency. Journal of Building Construction and Planning Research. 3 (2), pp. 47-59. https://doi.org/10.4236/jbcpr.2015.32006
TypeArticle
TitleOptimisation of direct expansion (DX) cooling coils aiming to building energy efficiency
AuthorsXia, L., Yang, T., Chan, Y., Tang, L. and Chen, Y.-T.
Abstract

Efficient Air Conditioning (A/C) system is the key to reducing energy consumption in building operation. In order to decrease the energy consumption in an A/C system, a method to calculate the optimal tube row number of a direct expansion (DX) cooling coil for minimizing the entropy generation in the DX cooling which functioned as evaporator in the A/C system was developed. The optimal tube row numbers were determined based on the entropy generation minimization (EGM) approach. Parametric studies were conducted to demonstrate the application of the analytical calculation method. Optimal tube row number for different air mass flow rates, inlet air temperatures and sensible cooling loads were investigated. It was found that the optimal tube row number of a DX cooling coil was in the range of 5 - 9 under normal operating conditions. The optimal tube row number was less when the mass flow rate and inlet air temperature were increased. The tube row number increased when the sensible cooling load was increased. The exergy loss when using a non-optimal and optimal tube row numbers was compared to show the advantage of using the optimal tube row number. The decrease of exery loss ranged from around 24% to 70%. Therefore the new analytical method developed in this paper offers a good practice guide for the design of DX cooling coils for energy conservation.

KeywordsOptimal Tube Row Number; Entropy Generation Minimization; Direct Expansion (DX) Cooling Coil; Building Energy Efficiency
Sustainable Development Goals9 Industry, innovation and infrastructure
Middlesex University ThemeSustainability
Research GroupFaculty of Science of Technology
PublisherScientific Research Publishing
JournalJournal of Building Construction and Planning Research
ISSN2328-4889
Electronic2328-4897
Publication dates
Online14 May 2015
PrintJun 2015
Publication process dates
Submitted12 Feb 2015
Accepted11 May 2015
Deposited11 Oct 2024
Output statusPublished
Publisher's version
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File Access Level
Open
Copyright Statement

Copyright © 2015 by authors and Scientific Research Publishing Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).

Digital Object Identifier (DOI)https://doi.org/10.4236/jbcpr.2015.32006
LanguageEnglish
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