NDLI: Experimental Characterization of a Natural Convection Heat Exchanger for Solar Domestic Hot Water Systems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cynthia, A. Cruickshank Stephen, J. Harrison
Copyright Year	2006
Abstract	To predict the long-term performance of solar domestic hot water (SDHW) systems requires computational models that can characterize the systems under a range of operating conditions. The development of detailed fundamental models that suitably describe the operation of systems with natural convection heat exchangers is, however, difficult and time consuming. The fact that the natural convection flow through the heat exchanger is intrinsically self-controlling and temperature dependent complicates the analysis. One approach to modeling this type of system is to use performance characteristics, empirically derived from experimental data, to predict the performance of the heat exchanger under typical operating conditions. Unfortunately, a significant number of tests may be required to characterize the full operation of the device. This paper presents a simplified test method that was developed to allow pre-configured SDHW systems that use natural convection heat exchangers, to be characterized. The results of this test method produce performance coefficients for simple empirical expressions that describe the fluid flow and heat transfer in the heat-exchange loop. These empirically derived coefficients are an input to a general simulation routine that allows overall system performance to be determined for various loads and climatic conditions. In this paper, data is presented for a typical heat exchanger under a range of operational conditions.
Sponsorship	Solar Energy Division
Starting Page	425
Ending Page	431
Page Count	7
File Format	PDF
ISBN	0791847454
DOI	10.1115/ISEC2006-99130
Volume Number	Solar Energy
Conference Proceedings	ASME 2006 International Solar Energy Conference
Language	English
Publisher Date	2006-07-08
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Fluid dynamics Natural convection Heat exchangers Flow (dynamics) Modeling Hot water Stress Performance characterization Heat Simulation Solar energy Experimental characterization Heat transfer
Content Type	Text
Resource Type	Article

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