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U = Overall heat transfer coefficient in Btu/(ft2-hr-deg F) A = Area in square feet T1 = outdoor temperature in degrees F T2 = indoor temperature in degrees F For heat gains due to people, equipment (hooded and unhooded), and lighting
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:
The Btu should not be confused with the Board of Trade Unit (BTU), an obsolete UK synonym for kilowatt hour (1 kW⋅h or 3,412 Btu). The Btu is often used to express the conversion-efficiency of heat into electrical energy in power plants. Figures are quoted in terms of the quantity of heat in Btu required to generate 1 kW⋅h of electrical energy.
HDD can be added over periods of time to provide a rough estimate of seasonal heating requirements. In the course of a heating season, for example, the number of HDD for New York City is 5,050 whereas that for Utqiagvik, Alaska is 19,990. Thus, one can say that, for a given home of similar structure and insulation, around four times the energy ...
The cooling load [3] is calculated to select HVAC equipment that has the appropriate cooling capacity to remove heat from the zone. A zone is typically defined as an area with similar heat gains, similar temperature and humidity control requirements, or an enclosed space within a building with the purpose to monitor and control the zone's temperature and humidity with a single sensor e.g ...
You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563. Should you need additional assistance we have experts available around the clock at 800-730-2563.
The heat pump itself can be improved by increasing the size of the internal heat exchangers, which in turn increases the efficiency (and the cost) relative to the power of the compressor, and also by reducing the system's internal temperature gap over the compressor. Obviously, this latter measure makes some heat pumps unsuitable to produce ...
The Kita Hands-Free sneakers have nearly 8,000 reviews and, while they have laces, you don't need to use them to secure the shoe into place. Here are 10 pairs of hands-free shoes you can pick up ...