- Author
-
Liu, S. T.
|
Kelly, G. E.
|
Terlizzi, C. P.
- Title
- Experimental Study on the Performance of a Combination Appliance for Domestic Hot Water and Space Heating.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
-
NISTIR 4356,
August 1990,
32 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
ASHRAE SPC-124P
|
ANSI/ASHRAE 103-1988
|
boiler
|
combination appliance
|
DOE water heater test procedure
|
fan coil air handling unit
|
gas-fired heater
|
laboratory tests
|
methods of calculation
|
space heating
|
water heating
- Abstract
- A Type II combination appliance consisting of a 50-gallon gas-fired water heater and a fan-coil air handling unit was tested in the laboratory to evaluate different methods for the determination of the combined heating seasonal, non-heating seasonal efficiencies and combined annual efficiency. Laboratory tests were conducted in accordance with the ANSI/ASHRAE 103-1988 for boilers and the DOE 10 CFR Part 430 for domestic water heaters to obtain the steady state and heating seasonal efficiences of the water heater functioning as a space heating boiler and the energy factor of the heater functioning as a dimestic water heater. These efficiency values were used to compute the combined heating seasonal and non-heating seasonal efficiencies by two different calculation methods. A series of tests with part load space heating cycling combined with domestic hot water draws were also conducted to measure the combined efficiencies directly. Comparison of the measured heating seasonal efficiency with those obtained from the tow proposed calculation methods showed very good agreement. Recommendation was made to adopt the NIST developed calculation method for the rating of the combination appliance.