-
-
Available Formats
- Options
- Availability
- Priced From ( in USD )
-
Available Formats
-
- Immediate download
-
$16.00Members pay $12.00
- Add to Cart
Customers Who Bought This Also Bought
-
4054 -- Deferred Heat Supply for Space Heating Using a Ca...
Priced From $16.00 -
4059 (RP-725) -- Performance of a Nozzle-Sprayed Ammonia ...
Priced From $16.00 -
4051 -- To Boil or Not to Boil---A Study of Bubble Embryo...
Priced From $16.00 -
4069 -- Thermodynamic Properties of the Lithium Bromide +...
Priced From $16.00
About This Item
Full 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