Field monitoring of solar domestic hot water systems based on simple tank temperature measurement

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Description

By dynamically measuring solar storage tank temperature(s), the solar storage tank effectively becomes a dynamic calorimeter to measure the energy flows in a solar system. The energy flows include solar loop gain, tank losses, and potentially draw extraction. With one-channel temperature loggers storing data over several days to several weeks, this approach provides low-cost, modest-accuracy performance assessment, useful for determination of savings persistence and diagnostics. Analysis is based upon the tank energy balance, identifying solar gain during the day and tank losses at night. These gains and losses can be compared to expectations based upon prior knowledge, and estimated weather ... continued below

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6 p.

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Burch, J.; Xie, Yuantao & Murley, C.S. May 1, 1995.

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Description

By dynamically measuring solar storage tank temperature(s), the solar storage tank effectively becomes a dynamic calorimeter to measure the energy flows in a solar system. The energy flows include solar loop gain, tank losses, and potentially draw extraction. With one-channel temperature loggers storing data over several days to several weeks, this approach provides low-cost, modest-accuracy performance assessment, useful for determination of savings persistence and diagnostics. Analysis is based upon the tank energy balance, identifying solar gain during the day and tank losses at night. These gains and losses can be compared to expectations based upon prior knowledge, and estimated weather conditions. Diagnostics include controller and pump operation, and excessive nighttime losses. With one point temperature logger, solar gain accuracy is expected to be 20 to 50%, depending on draw frequency and volume. Two examples are shown, a properly operating system and a system with excessive nighttime losses.

Physical Description

6 p.

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OSTI as DE95009208

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  • SOLAR `95: national solar energy conference: 10,000 solutions - paths to a renewable future, Minneapolis, MN (United States), 15-20 Jul 1995

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  • Other: DE95009208
  • Report No.: NREL/TP--472-7854
  • Report No.: CONF-950725--1
  • Grant Number: AC36-83CH10093
  • Office of Scientific & Technical Information Report Number: 64143
  • Archival Resource Key: ark:/67531/metadc697094

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  • May 1, 1995

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • March 28, 2016, 3:08 p.m.

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Burch, J.; Xie, Yuantao & Murley, C.S. Field monitoring of solar domestic hot water systems based on simple tank temperature measurement, article, May 1, 1995; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc697094/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.