Discharge experiments in an initially stratified vertical storage tank with an immersed baffled heat exchanger

Julia F. Haltiwanger, Jane H. Davidson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A number of solar domestic hot water systems and many combined space and water heating systems have heat exchangers placed directly in the storage fluid to charge and/or discharge the tank. Operation of the heat exchanger produces a buoyancy-driven flow within the storage fluid. With a view toward controlling the flow field to increase heat transfer, a cylindrical baffle was inserted in a 350 liter cylindrical storage tank. The cylindrical baffle creates a 40mm annulus with the tank wall in which an immersed copper coil heat exchanger is located. The effects of the baffle on heat exchanger outlet temperature, cumulative energy depletion, and temperature distribution within the storage fluid were measured during discharge of an initially thermally stratified storage tank. The primary finding is that the presence of the baffle increases the rate of energy discharge and improves the quality of energy delivered.

Original languageEnglish (US)
Title of host publicationAmerican Solar Energy Society - SOLAR 2008, Including Proc. of 37th ASES Annual Conf., 33rd National Passive Solar Conf., 3rd Renewable Energy Policy and Marketing Conf.
Subtitle of host publicationCatch the Clean Energy Wave
Pages502-520
Number of pages19
StatePublished - Dec 1 2008
EventSOLAR 2008: Catch the Clean Energy Wave, Including 37th ASES Annual Conference, 33rd National Passive Solar Conference and 3rd Renewable Energy Policy and Marketing Conference - San Diego, CA, United States
Duration: May 3 2008May 8 2008

Publication series

NameAmerican Solar Energy Society - SOLAR 2008, Including Proc. of 37th ASES Annual Conf., 33rd National Passive Solar Conf., 3rd Renewable Energy Policy and Marketing Conf.: Catch the Clean Energy Wave
Volume1

Other

OtherSOLAR 2008: Catch the Clean Energy Wave, Including 37th ASES Annual Conference, 33rd National Passive Solar Conference and 3rd Renewable Energy Policy and Marketing Conference
CountryUnited States
CitySan Diego, CA
Period5/3/085/8/08

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  • Cite this

    Haltiwanger, J. F., & Davidson, J. H. (2008). Discharge experiments in an initially stratified vertical storage tank with an immersed baffled heat exchanger. In American Solar Energy Society - SOLAR 2008, Including Proc. of 37th ASES Annual Conf., 33rd National Passive Solar Conf., 3rd Renewable Energy Policy and Marketing Conf.: Catch the Clean Energy Wave (pp. 502-520). (American Solar Energy Society - SOLAR 2008, Including Proc. of 37th ASES Annual Conf., 33rd National Passive Solar Conf., 3rd Renewable Energy Policy and Marketing Conf.: Catch the Clean Energy Wave; Vol. 1).