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The SEER rating of a unit is the cooling output during a typical cooling-season divided by the total electric energy input during the same period. The higher the unit's SEER rating the more energy efficient it is. In the U.S., the SEER is the ratio of cooling in British thermal units (BTUs) to the energy consumed in watt-hours.
A Minecraft server is a player-owned or business-owned multiplayer game server for the 2011 Mojang Studios video game Minecraft. In this context, the term "server" often refers to a network of connected servers, rather than a single machine. [ 1 ]
The same device used between the same temperatures is more efficient when considered as a heat pump than when considered as a refrigerator since C O P h e a t i n g = C O P c o o l i n g + 1 {\displaystyle \mathrm {COP} _{\mathrm {heating} }=\mathrm {COP} _{\mathrm {cooling} }+1}
Then if is more efficient than , the machine will violate the second law of thermodynamics. Since a Carnot heat engine is a reversible heat engine, and all reversible heat engines operate with the same efficiency between the same reservoirs, we have the first part of Carnot's theorem:
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The higher the HSPF rating of a unit, the more energy efficient it is. An electrical resistance heater, which is not considered efficient, has an HSPF of 3.41. [3] Depending on the system, an HSPF ≥ 9 can be considered high efficiency and worthy of a US Energy Tax Credit. [4]
For example, a data center with high PUE value and high server utilization could be more efficient than a data center with low PUE value and low server utilization. [10] There is also some concern within the industry of PUE as a marketing tool [ 11 ] leading some to use the term "PUE Abuse".
The COP of absorption chillers can be improved by adding a second or third stage. Double and triple effect chillers are significantly more efficient than single effect chillers, and can surpass a COP of 1. They require higher pressure and higher temperature steam, but this is still a relatively small 10 pounds of steam per hour per ton of cooling.