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Simulations of Chilled Water Cooling Coil Delta-T Characteristics.
- Source :
-
ASHRAE Transactions . 2012, Vol. 118 Issue 2, p349-356. 8p. - Publication Year :
- 2012
-
Abstract
- Increasing loop chilled water return and supply temperature difference or delta-T is an effective way to improve the chilled water system efficiency and save chiller plant operating costs. In some chiller plants, the delta-T can be expected to fall to about one-half to two-thirds of design at low loads due to various causes, such as coil load, air entering and leaving temperatures, and chilled water supply temperature. Computational simulation is a useful and flexible tool to study cooling coil delta-T characteristics under various conditions. This paper simulated the cooling coil delta-T profiles with different geometric configurations and various waterside and airside conditions using an effectiveness-NTU model. The waterside heat convection coefficient was modeled with a combined correlation. The simulation results show that the existing waterside correlations generated significantly different delta-T profiles. With variant geometric configurations, the coil delta-T at full load may be higher, equal, or lower than that at part load. The complexity of cooling coil delta-T characteristics indicates that it is hard to make conclusions about the coil delta-T change with cooling loads. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00012505
- Volume :
- 118
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- ASHRAE Transactions
- Publication Type :
- Conference
- Accession number :
- 83754930