Effects of plumbing attachments on heat losses from solar domestic hot water storage tanks. Final report, Part 2

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The Solar Rating and Certification Corporation (SRCC) has established a standardized methodology for determining the performance rating of the Solar Domestic Hot Water (SDHW) systems it certifies under OG-300. Measured performance data for the solar collector component(s) of the system are used along with numerical models for the balance of the system to calculate the system`s thermal performance under a standard set of rating conditions. SRCC uses TRNSYS to model each of the components that comprise the system. The majority of the SRCC certified systems include a thermal storage tank with an auxiliary electrical heater. The most common being a ... continued below

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36 p.

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Song, J.; Wood, B.D. & Ji, L.J. March 1, 1998.

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Description

The Solar Rating and Certification Corporation (SRCC) has established a standardized methodology for determining the performance rating of the Solar Domestic Hot Water (SDHW) systems it certifies under OG-300. Measured performance data for the solar collector component(s) of the system are used along with numerical models for the balance of the system to calculate the system`s thermal performance under a standard set of rating conditions. SRCC uses TRNSYS to model each of the components that comprise the system. The majority of the SRCC certified systems include a thermal storage tank with an auxiliary electrical heater. The most common being a conventional fifty gallon electric tank water heater. Presently, the thermal losses from these tanks are calculated using Q = U {center_dot} A {center_dot} {Delta}T. Unfortunately, this generalized formula does not adequately address temperature stratification both within the tank as well as in the ambient air surrounding the tank, non-uniform insulation jacket, thermal siphoning in the fluid lines attached to the tank, and plumbing fittings attached to the tank. This study is intended to address only that part of the problem that deals with the plumbing fittings attached to the tank. Heat losses from a storage tank and its plumbing fittings involve three different operating modes: charging, discharging and standby. In the charging mode, the tank receives energy from the solar collector. In the discharge mode, water flows from the storage tank through the distribution pipes to the faucets and cold city water enters the tank. In the standby mode, there is no forced water flow into or out of the tank. In this experimental study, only the standby mode was considered.

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36 p.

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OSTI as DE99000108

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  • Other Information: PBD: Mar 1998

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  • Other: DE99000108
  • Report No.: DOE/GO/10086--T1-Pt.2
  • Grant Number: FG36-95GO10086
  • DOI: 10.2172/674948 | External Link
  • Office of Scientific & Technical Information Report Number: 674948
  • Archival Resource Key: ark:/67531/metadc711939

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 2, 2018, 12:35 a.m.

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Song, J.; Wood, B.D. & Ji, L.J. Effects of plumbing attachments on heat losses from solar domestic hot water storage tanks. Final report, Part 2, report, March 1, 1998; Tempe, Arizona. (digital.library.unt.edu/ark:/67531/metadc711939/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.