CH-81-09-1 — Determination of Annual Efficiency of Vented Heaters Equipped with Thermally Activated Vent Dampers

Description

Part-load space heater efficiency requires the determination of five flue losses. These are latent heat loss (L_L), on-period sensible heat loss (L_S,ON), on-period infiltration loss (L_I,ON), off-period sensible heat loss (LS,OFF) and off-period infiltration loss (L_I,OFF).

We determined:
— Which of the part-load losses can be adequately measured using the current DOE procedure?
— Which part load losses cannot be measured using the DOE procedure?
— Seasonal efficiencies for three vented heaters using the current and a modified procedure.

All stack losses associated with the calculation of part-load utilization efficiency (nu) were reviewed in the development of a test method for heaters equipped with the thermally-activated vent damper. Annual fuel utilization efficiency and associated energy savings were determined for two thermal vent dampers tested with three types of gas-fueled heaters which operate in either the cycling mode or in the modulating fuel input mode.

Test results showed energy savings from 1 to 9% depending on the type of heater as well as the type of damper used.

Citation: Symposium, ASHRAE Transactions, Volume 87, Part 1, Chicago, Illinois

Product Details

Published:

1981

Number of Pages:

16

File Size:

1 file , 1.4 MB

Product Code(s):

D-CH-81-09-1