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- W2765804591 abstract "AN IMPROVED SIMPLE CHILLED WATER COOLING COIL MODEL Liping Wang, Philip Haves and Fred Buhl Lawrence Berkeley National Laboratory, Berkeley, CA ABSTRACT The accurate prediction of cooling and dehumidification coil performance is important in model- based fault detection and in the prediction of HVAC system energy consumption for support of both design and operations. It is frequently desirable to use a simple cooling coil model that does not require detailed specification of coil geometry and material properties. The approach adopted is to match the overall UA of the coil to the rating conditions and to estimate the air-side and water-side components of the UA using correlations developed by Holmes (1982). This approach requires some geometrical information about the coil and the paper investigates the sensitivity of the overall performance prediction to uncertainties in this information, including assuming a fixed ratio of air-side to water-side UA at the rating condition. Finally, simulation results from different coil models are compared, and experimental data are used to validate the improved cooling coil model. INTRODUCTION Coils in HVAC systems couple air and water (or refrigerant) loops. The accurate prediction of cooling and dehumidification coil performance is important in model-based fault detection and in the prediction of HVAC system energy consumption to support both design and operation. Simulation of transient behavior is needed to assess local loop control performance while steady state modeling is generally sufficient for energy calculations. Recent work on coil modeling has focused on modeling dynamic response (Zhou 2005, Yu et al. 2005, Yao et al. 2004, Blomberg 1999), although these studies also address aspects of steady state performance, such as the velocity dependence of the surface convective heat transfer coefficients. A simplified method for modeling the steady state performance of cooling coils was developed by Braun (1988), who showed that the error in the heat transfer rate caused by assuming that a partially wet coil is completely wet or completely dry (whichever predicts the greater heat" @default.
- W2765804591 created "2017-11-10" @default.
- W2765804591 creator A5052787170 @default.
- W2765804591 date "2014-04-21" @default.
- W2765804591 modified "2023-09-27" @default.
- W2765804591 title "An Improved Simple Chilled Water Cooling Coil Model - eScholarship" @default.
- W2765804591 hasPublicationYear "2014" @default.
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