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Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]
Specifically, the heat pump transfers thermal energy using a heat pump and refrigeration cycle, cooling the cool space and warming the warm space. [1] In winter a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the house to the warmer outdoors in summer.
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
The heating value depends on the source of gas that is used and the process that is used to liquefy the gas. The range of heating value can span ±10 to 15 percent. A typical value of the higher heating value of LNG is approximately 50 MJ/kg or 21,500 BTU/lb. [2] A typical value of the lower heating value of LNG is 45 MJ/kg or 19,350 BTU/lb.
Models were now the 1500 half-ton, 2500 three-quarter-ton, and 3500 dual-rear-wheel only one-ton in both two- and four-wheel drive. Ram 1500s offered both short 6.5-foot (2.0 m) and long 8-foot (2.4 m) cargo beds on both regular and extended Club Cabs, Ram 2500s offered only long beds with regular cabs or a choice of beds on Club Cabs, and Ram ...
An American mining engineer, C.M. Rolker estimated the cost of production would be £41 8s per ton of refined copper—£13 5s per ton less than the estimated current production costs—with an additional £11 6s 3d worth of precious metals, per ton. At a copper price of £60 per ton, Rolker forecast a profit of 15s 10½d per ton of ore processed.
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