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

Abstract

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.

Authors:
;  [1];  [2]
  1. National Renewable Energy Lab., Golden, CO (United States)
  2. Sacramento Municipal Utility District, CA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab., Golden, CO (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
64143
Report Number(s):
NREL/TP-472-7854; CONF-950725-1
ON: DE95009208; TRN: 95:004379
DOE Contract Number:  
AC36-83CH10093
Resource Type:
Conference
Resource Relation:
Conference: SOLAR `95: national solar energy conference: 10,000 solutions - paths to a renewable future, Minneapolis, MN (United States), 15-20 Jul 1995; Other Information: PBD: May 1995
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; SOLAR WATER HEATERS; MONITORING; TANKS; TEMPERATURE MEASUREMENT; CALORIMETRY; ENERGY BALANCE

Citation Formats

Burch, J., Xie, Yuantao, and Murley, C.S. Field monitoring of solar domestic hot water systems based on simple tank temperature measurement. United States: N. p., 1995. Web.
Burch, J., Xie, Yuantao, & Murley, C.S. Field monitoring of solar domestic hot water systems based on simple tank temperature measurement. United States.
Burch, J., Xie, Yuantao, and Murley, C.S. Mon . "Field monitoring of solar domestic hot water systems based on simple tank temperature measurement". United States. https://www.osti.gov/servlets/purl/64143.
@article{osti_64143,
title = {Field monitoring of solar domestic hot water systems based on simple tank temperature measurement},
author = {Burch, J. and Xie, Yuantao and Murley, C.S.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {5}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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