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4082 — The Effect of Residential Equipment Capacity on Energy Use, Demand, and Run-Time

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Conference Proceeding by ASHRAE, 1997

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Description

The capacities of installed central air-conditioning systems in 368 recently built Florida homes were compared with Manual J load values calculated from house audit data. More than 50% of the homes had installed systems with a cooling capacity greater than 120% of the calculated Manual J value. Thirty-one percent of the 78 heat pump homes had installed heating capacities greater than 120% of the calculated Manual J value. Using submetered data from the air-conditioning system, a definite increase in peak energy use was observed for systems sized over 120% of Manual J calculations. The effect of system sizing on the system run-time fractions of units is shown. The homes that had units sized smaller than the calculated Manual J value tended to have higher percentages of maximum hourly run-time fractions. There was little difference in binned percentages of large run-time fractions between homes with installed-to-calculated ratios of 1.0 to 1.2 and those with installed-to-calculated ratios greater than 1.2.

Units: Dual

KEYWORDS: year 1997, Domestic, equipment, air conditioning, energy consumption, housing, USA, sizing, comparing, oversizing, heat pumps, heat load, calculating, unit air conditioners, electricity consumption, peak load

Citation: ASHRAE Transactions, Vol.103, Part 2, Boston 1997

Product Details

Published:
1997
Number of Pages:
7
File Size:
1 file , 840 KB
Product Code(s):
D-16471