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[1] [2] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs. The COP is used in thermodynamics . The COP usually exceeds 1, especially in heat pumps, because instead of just converting work to heat (which, if 100% efficient, would be a COP of 1), it pumps additional heat from a heat source to ...
Just as horsepower and candlepower were intuitive units of measure for people living through the transition from horse to steam power [3] and from flame-based to electric lighting, so was the ton of refrigeration an intuitive unit of measure during a technological change, as the ice trade gradually included growing percentages of artificial ice ...
Air conditioner equipment power in the U.S. is often described in terms of "tons of refrigeration", with each approximately equal to the cooling power of one short ton (2,000 pounds (910 kg) of ice melting in a 24-hour period. The value is equal to 12,000 BTU IT per hour, or 3,517 watts. [60]
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
Replacing a clogged air filter can improve a cars fuel consumption by as much as 10 percent on older vehicles. [40] On newer vehicles (1980s and up) with fuel-injected, computer-controlled engines, a clogged air filter has no effect on mpg but replacing it may improve acceleration by 6-11 percent. [41] Aerodynamics also aid in efficiency of a ...
The broad usage allows for nearly any device intended for domestic use to be a home appliance, including consumer electronics as well as stoves, [5] refrigerators, toasters [5] and air conditioners. The development of self-contained electric and gas-powered appliances, an American innovation, emerged in the early 20th century.
This is a very common unit type. The rising cost of energy means that air conditioning manufacturers must develop a new generation of high-efficiency, cost-effective air conditioners for commercial buildings that meet or exceed a part-load efficiency standard of typically 18 IEER. The aim is to reduce energy use by 30% over current equipment.
For air conditioners, the directive applies only to units under 12 kW. Every label contains the following information: the model, the energy efficiency category from A+++ to G, the annual energy consumption (full load at 500 hours per year) the cooling output at full load in kW; the energy efficiency ratio in cooling mode at full load