By H.P. Garg
The objective of penning this 3 quantity 'Advances in solar power know-how' is to supply the entire suitable most recent info on hand within the box of solar power (Applied in addition to Theoretical) to function the simplest resource fabric at one position. makes an attempt are made to debate subject matters intensive to aid either the scholars (i.e. undergraduate, postgraduate, study students etc.) and the pros (i.e. Consultancy, layout, and contracting firms). bankruptcy 1 starts off with a short background of sunlight homes (active heating), one of many oldest and nonetheless the generally used program of solar power. numerous tools of construct ing heating and different basic elements equivalent to construction shape and capabilities also are defined. a number of parts of lively sun heating of creating like sunlight collector, garage method, keep watch over unit, auxiliary warmth resource, and so on. are mentioned very in brief. 3 kinds of sun energetic heating of constructions like sunlight air structures, sun liquid structures, and sunlight assisted warmth pump platforms are mentioned intimately during this bankruptcy. layout information and function of 9 usual sunlight homes that are in use in numerous weather conditions and utilizing a few more moderen ideas also are mentioned extensive during this chapter.
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7(a) shows a basic circuit of a simple heat pump which includes four main components: compressor, condenser, evaporator, working fluid generally one of the freons, and expander. In this figure a reversing valve is also shown by means of which the roles of the condenser and evaporator can be reversed. Most small commercial units use four-way solenoid valve as a reversing valve. Heat is continuously pumped from lower to higher temperature by periodic compression and decompression of the working fluid using compressor run by electricity.
The main advantage of a liquid heating system is that they are widely studied, used and can readily supply combined space heating and cooling and domestic hot water supply and therefore liquid systems are suitable for commercial buildings. For the same collector inlet temperatures, the liquid collectors operate at higher efficiencies and can provide domestic hot water efficiently compared to air collectors. The liquid systems occupy less space. ; low overall efficiency due to several heat exchangers; and comparatively low durability.
Therefore, a air-to-air heat pump is so chosen that for a design outdoor temperature, the heat pump meets the requirement of the maximum heating load. Several simulation studies[96,103,104,106,111,112,116] on the solar assisted heat pumps for house heating are carried out for series, parallel, and dual source heat pump systems for different climatic regions of the world. But the most comprehensive and widely used simulation program is the TRNSYS simulation program. In a quasi steady state model developed to study the performance of solar assisted heat pump[103,104,116] a 3-ton air source unit is considered and a paramter F which is defined as the fraction of the total load that is met by the free energy is used.