Description

In situ input/output measurements were performed on a hot water and a steam boiler, both of which are used in apartment building central-heating systems. Measurements on the hot water boiler were made with two distinct control schemes – (1) constant boiler temperature and (2) variation of the boiler temperature with an outdoor reset control. The measured part-load efficiency curves of these boilers are presented along with a comparison of various boiler models. The models were used to estimate the seasonal efficiency of the two boilers and to estimate the magnitude and variations in off-cycle energy loss rate. In particular, the dependence of off-cycle loss rate on outside temperature was studied. Direct measurement of the rate of energy loss through the flue of the steam boiler during burner off-periods was conducted throughout the heating season. These results were also studied to examine the dependence of off-cycle flue losses on outside temperature, cycling rate, and other boiler operating parameters.

KEYWORDS: comparing, efficiency, measuring, boilers, hot water boilers, flats, models, steam boilers, central heating, controls, friction loss, flues, pressure drop, heating season, cyclic, heat loss, temperature, calculating, burners, outdoor temperature.

Citation: Symposium, ASHRAE Trans., 1993, vol.99, part 2, paper number DE-93-1-1, 429-439, 7 figs, 2 tabs, refs.

Product Details

Published:

1993

File Size:

1 file , 1.4 MB

Product Code(s):

D-17439