More.
1. Introduction
The mission at the U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) is to lead the
nation toward a sustainable energy future by developing renewable energy technologies, improving energy efficiency,
advancing related science and engineering, and facilitating commercialization. The goal of the Cool Car Project is to work
with the automotive industry to reduce the fuel used for vehicle climate control by 50% in the short-term and 75% in the
long-term while maintaining or improving the occupantsí thermal comfort and safety.
The power necessary to operate a vehicle air-conditioning compressor is significant ñ it can be greater than the engine
power required to move a mid-sized vehicle at a constant speed of 56 km/h (35 mph). A 400-W load on a conventional
engine can decrease the fuel economy by about 0.4 km/L (1 mpg). The United States could save over $6 billion annually if
all the light-duty vehicles in the country achieved a modest 0.4-km/L (1-mpg) increase in fuel economy.



We estimated the impact of auxiliary loads for the driving cycles scheduled for use in U.S. EPA certification
procedures: FUDS (an urban driving cycle), HWFET (a highway driving cycle), SC03, and US06. The HEV had a
combined metro-highway fuel economy of 5.19 L/100 km (45.4 mpg).
The maximum thermal cooling load was assumed to be 7 kW. The net coefficient of performance of the electrically
driven air-conditioning system, including the efficiency of the compressor and the electric motor required to drive it,
was assumed to be 2.33. This yielded a maximum electrical load (resulting from air-conditioning) of 3 kW, which
was added to the baseline value of 500 W in increments of 1000 W to determine the impact of auxiliary loads. All
simulated cycles for the HEV model started and ended at the same battery state-of-charge, to within 0.5% of the
initial pack capacity

3000 watts is about 10,239 btus (3.413 btus per watt, for thoes that like details)..... Like I said about one ton or 12,000 btus...........

Woody