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The first of the cooling load factors used in this method is the CLTD, or the Cooling Load Temperature Difference. This factor is used to represent the temperature difference between indoor and outdoor air with the inclusion of the heating effects of solar radiation. [1] [5] The second factor is the CLF, or the cooling load factor.
Likewise, a similar home in Miami, Florida, whose heating degree days for the heating season is 500, would require around one tenth of the energy required to heat the house in New York City. [7] However, this is a theoretical approach as the level of insulation of a building affects the demand for heating. For example, temperatures often drop ...
The SI unit of power for heating and cooling systems is the watt. Btu per hour (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu". [18] MBH—thousands of Btu per hour—is also common. [19] 1 W is approximately 3.412142 Btu/h [20]
With a SEER of 10 BTU/(W·h), the annual electrical energy usage would be about: 5,000,000 BTU/year ÷ 10 BTU/(W·h) = 500,000 W·h/year. The average power usage may also be calculated more simply by: Average power = (BTU/h) ÷ (SEER) = 5000 ÷ 10 = 500 W = 0.5 kW. If your electricity cost is $0.20/(kW·h), then your cost per operating hour is:
For a heating system this would mean two things: Reducing the output temperature to around 30 °C (86 °F) which requires piped floor, wall or ceiling heating, or oversized water to air heaters. Increasing the input temperature (e.g. by using an oversized ground source or by access to a solar-assisted thermal bank [10]).
Heating seasonal performance factor (HSPF) is a term used in the heating and cooling industry. HSPF is specifically used to measure the efficiency of air source heat pumps. HSPF is defined as the ratio of heat output (measured in BTUs) over the heating season to electricity used (measured in watt-hours). [1] [2] It therefore has units of BTU ...
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