Nashville solar-water-heater demonstration project: monitoring data analysis. Interim report, April 1981-May 1981

Technical Report · Tue Dec 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6718768· OSTI ID:6718768

The performances of the ten monitored solar domestic water heating systems in the Nashville program were monitored during April and May of 1981. The quantities measured and recorded were (1) solar energy contribution to the water stream, (2) total energy contribution to the water stream, (3) gallons of hot water used, and (4) electrical power consumed by the electrical elements, solar loop pump(s), and differential controller. The average savings to the customer based on 28 days of data for April was 200 kWh. This savings was worth $8.85 at the April 2, 1981 power rate of $0.04157/kWh. The average hot water consumption of each family for this one-month period was 82.8 gallons per day with a daily per person usage of 23.0 gallons. Solar energy supplied 50 percent of the thermal energy delivered to the customer for the month of April. The electrical demand, compared to an analytical model of a conventional electric water heater that delivered the same thermal load, was reduced without the use of a load management device. The average savings to the customer based on 29 days of data for May was 172 kWh. This savings was worth $7.65 at the April 1981 power rate. The average hot water consumption of each family for this one-month period was 78.1 gallons per day with a daily per person usage of 21.1 gallons. Solar energy supplied 46 percent of the thermal energy delivered to the customer for the month of May. The electrical demand was also reduced in May compared to an analytical model of a conventional electric water heater that delivered the same thermal load.

• Research Organization: Tennessee Valley Authority, Chattanooga (USA). Div. of Energy Conservation and Rates
• OSTI ID: 6718768
• Report Number(s): TVA/OP/ECR-82/23; ON: DE83900175
• Country of Publication: United States
• Language: English

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14 SOLAR ENERGY
140907* -- Solar Thermal Utilization-- Water Heating
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