Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8040
Title: Enhancing the performance of large primary-secondary chilled water systems by using bypass check valve
Authors: Ma, Z
Wang, S 
Keywords: Bypass check valve
Chilled water system
Energy saving
Low delta-T syndrome
Performance evaluation
Issue Date: 2011
Publisher: Pergamon Press
Source: Energy, 2011, v. 36, no. 1, p. 268-276 How to cite?
Journal: Energy 
Abstract: Large primary-secondary chilled water systems often suffer from low chilled water temperature difference (i.e., known as low delta-T central plant syndrome) during operation. This paper presents a detailed study to investigate the feasibility and potential benefits related to the use of a bypass check valve in the chiller decouple line to solve this operational problem and hence, to improve the overall system operating efficiency. The objective of this study is to provide some guidance and necessary confidence as well as the awareness of potential problems that may arise when a bypass check valve is considered to handle the low delta-T syndrome. Based on testing the effects of the low delta-T syndrome, the performances of the systems with and without the bypass check valve are then evaluated by using a simulated virtual system. In the tests, the low delta-T syndrome was introduced through air-side fouling by changing the air-side thermal resistance coefficient in the cooling coil model. The results show that, if the chilled water system suffered from 20% air-side fouling, about 6.77% total energy of the chilled water system studied can be saved when a bypass check valve is used, as compared to that without the bypass check valve.
URI: http://hdl.handle.net/10397/8040
ISSN: 0360-5442
EISSN: 1873-6785
DOI: 10.1016/j.energy.2010.10.042
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