heat-pumps
51Diode — Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left) …
52Wind power — Wind power: worldwide installed capacity [1] …
53COP — an abbreviation for coefficient of performance, a measure of the efficiency of heat pumps, air conditioners, refrigerators, and freezers. The COP is the ratio of the useful energy output of the system (the amount of heat energy added to or… …
54Off-the-grid — For other uses, see Off the grid (disambiguation). The term off the grid (OTG) or off grid refers to living in a self sufficient manner without reliance on one or more public utilities. Off the grid homes are autonomous; they do not rely on… …
55Swimming pool sanitation — articleissues refimprove = January 2008 technical = August 2008Swimming pool sanitation refers to both visual clarity and levels of microflora, such as bacteria and viruses in swimming pools. The goal of sanitation is to prevent the spread of… …
56Stirling engine — Alpha type Stirling engine. There are two cylinders. The expansion cylinder (red) is maintained at a high temperature while the compression cylinder (blue) is cooled. The passage between the two cylinders contains the regenerator …
57Entropy — This article is about entropy in thermodynamics. For entropy in information theory, see Entropy (information theory). For a comparison of entropy in information theory with entropy in thermodynamics, see Entropy in thermodynamics and information… …
58Thermodynamics — Annotated color version of the original 1824 Carnot heat engine showing the hot body (boiler), working body (system, steam), and cold body (water), the letters labeled according to the stopping points in Carnot cycle …
59Enthalpy — Thermodynamics …
60Geothermal power — (from the Greek roots geo , meaning earth, and therme , meaning heat) is energy generated by heat stored in the earth, or the collection of absorbed heat derived from underground, in the atmosphere and oceans. Prince Piero Ginori Conti tested the …
