By H.P. Garg

The objective of penning this 3 quantity 'Advances in solar power know-how' is to supply all of the proper most recent info on hand within the box of solar power (Applied in addition to Theoretical) to function the easiest resource fabric at one position. makes an attempt are made to debate themes intensive to aid either the scholars (i.e. undergraduate, postgraduate, learn 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. quite a few tools of construct­ ing heating and different common features similar to development shape and features also are defined. numerous parts of lively sun heating of establishing like sunlight collector, garage procedure, keep an eye on unit, auxiliary warmth resource, and so forth. are mentioned very in short. 3 varieties of sun lively heating of structures like sun air structures, sun liquid structures, and sun assisted warmth pump platforms are mentioned intimately during this bankruptcy. layout info and function of 9 normal sunlight homes that are in use in several weather conditions and utilizing a few more recent recommendations also are mentioned intensive during this chapter.

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A: I UJ Il. I ~ UJ I- UJ a: ::> 17--- --AI I I I I I VI VI UJ a: Il. I h. ~ I I Iho Ih. SPECIFIC (b) H~ol I I I HEAT ABSDRBED(T2)IB I ENTHALPY WORK COP (Cooli~g): COP (H~oling) ; TT2 ) ( ,- T2 _1_,_ (1,-T2) ~ I I I he (J/Kg) pump cycle. 7 HEAT PUMP PRINCIPLES A heat pump in combination with solar heated air or water is an economically attractive and viable system. In winter season, when the solar intensity is low, and the solar collected heat from solar flat-plate collectors is at a low temperature for space heating, and can be used as a source for the heat pump which will improve its performance considerably.

This liquified working fluid gets vapourised in passing through expansion valve. This evaporation in the evaporator requires large amount of heat which is drawn from the surroundings. This large amount of low-temperature heat is supplied to the evaporator by sourrounding air, underground water, earth, river water, waste water or solar heated air or water. A simplified refrigeration/heat pump cycle can be best shown on Pressure-enthalpy diagram as is shown in fig. 7(b). Compressor at point B takes the saturated vapour compresses it to point C and in doing so because work is done increases its enthalpy, pressure and temperature.

It is seen that with a SOLAR HEATING OF BUILDINGS: ACTIVE SYSTEMS 41 series heat pump about 60 to 70 percent of the heat load can be met by these free energies. The performance of parallel system is better than the dual system, the series system, and also the conventional solar system. In a parallel system, if the area is increased from 0 to 20 m2 , the fraction of the free energy supplied increases from 40 to 60 percent. The performance further increases with collector area but not at a faster rate as in case of series system or conventional solar system and this fraction becomes 80 percent at a collector area of 60 m 2 .

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