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Solar Thermal Collectors
Published in D. Yogi Goswami, Principles of Solar Engineering, 2023
Evacuated-tube devices have been proposed as efficient solar energy collectors since the early 20th century. In 1909, Emmett proposed several evacuated-tube concepts for solar energy collection, two of which are being sold commercially today (Emmett 1911). Speyer (1965) also proposed a tubular evacuated flat-plate design for high-temperature operation. With the recent advances in vacuum technology, evacuated-tube collectors can be reliably mass produced. Their high-temperature effectiveness is essential for the efficient operation of solar air-conditioning systems and process heat systems.
Dynamic Design Concepts for Hot Climatic Conditions
Published in Neha Gupta, Gopal Nath Tiwari, Photovoltaic Thermal Passive House System, 2022
In hot climates, thermal comfort cooling is important for space conditioning of buildings. Feasibility of solar insolation and cooling load exists nearly in a similar phase. Solar air conditioning can be attained by (a) absorption cycles, (b) desiccant cycles and (c) solar-mechanical processes. A continuous or intermittent cycle, hot- or cold-side energy storage, diverse control strategies, various temperature ranges of operation, different collectors, etc. can be possible under above-mentioned categories. Theoretically, numerous thermal efficiencies of solar cooling processes can be achieved. The temperature constraints in mechanism of solar collectors restrict their thermal efficiencies. Compared to provision of additional cooling, minimization of cooling loads through cautious building design and insulation are much cheaper, which makes them preferable. Proficient design and construction of a building can minimize the load on any air conditioning or heating system but we are concerned for cooling loads that should really be considered in a decent building design.
Solar Energy Systems
Published in Dale R. Patrick, Stephen W. Fardo, Ray E. Richardson, Brian W. Fardo, Energy Conservation Guidebook, 2020
Dale R. Patrick, Stephen W. Fardo, Ray E. Richardson, Brian W. Fardo
Solar air-conditioning systems seem to have excellent potential for solar energy use. This is true since cooling needs are greatest when a large portion of the sun’s rays reach the earth’s surface. Storage requirements are less for cooling than for heating systems. But, the fluid temperature must be raised to a higher level for cooling. Solar air-conditioning systems have shown to be effective in certain geographical areas.
Second law analysis of the 160 Wp standalone solar photovoltaic system
Published in International Journal of Sustainable Energy, 2019
Ranjeet Kumar Jha, Avadhesh Yadav, Durgesh Sharma
Badescu (2002) presented the first and second law analysis of solar assisted heat pump used to heat an ecological building; the second law emphasised that most of the exergy is lost during compression and condensation (Badescu 2002). Sahin, Dincer, and Rosen (2007) presented a thermodynamic analysis of SPV Cell. They found the efficiency of electricity conversion from 7% to 12% whereas exergy efficiency varies from 2% to 8% (Sahin, Dincer, and Rosen 2007). Chow et al. (2009) presented energy analysis of Photovoltaic thermal collector with and without glass cover on the basis of the first law of thermodynamics a glaze PV/T system is more suitable whereas on the basis of second law of thermodynamics efficiency of PV/T, packing factor, water mass to collector area ratio and wind velocity are found to be favourable for unglazed PV/T system(Chow et al. 2009). Saidur et al. (2012) presented a review of exergy analysis of solar systems like SPV, solar air conditioning and refrigeration, solar drying and solar power generation system (Saidur et al. 2012). Srivastava and Sudhakar (2014) executed energy and exergy analysis of 36W SPV module (Srivastava and Sudhakar 2014). Kalogiroua et al. (2016) execute exergy analysis of solar thermal system (Kalogiroua et al. 2016). Pradhan, Kar, and Mohanty (2017) presented thermal and electrical performance analysis of rooftop SPV power generator (Pradhan, Kar, and Mohanty 2017). All these researchers discuss the exergy and energy analysis of SPV system, but no one discussed the effect of an ambient condition like temperature and air velocity on the second law efficiency of SPV system as well as the loss of work potential with the temperature of the module.
Experimental investigation of a solar energy based cooking system for the steam method of cooking using evacuated tube collector
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Ranjan Chaudhary, Lokesh Pandey, Avadhesh Yadav
Also, a number of experimental investigations have been carried out previously to obtain dry and hot air form solar systems with the help of evacuated tube collector by Kumar and Yadav (2017a); Mehla and Yadav (2017). The investigated solar collector system was able to achieve the boiling temperature of water. Kumar and Yadav (2017b) employed the evacuated tube collector for a desiccant solar air conditioning system. The results obtained from the study clearly showed that evacuated tube collector solved the purpose of heating quite efficiently. Bhargva and Yadav (2019) found satisfactory results with respect to the temperature of the working fluid in the solar still coupled with evacuated tube collector.
Energy and exergy analysis of a PCM-based solar powered winter air conditioning using desiccant wheel during nocturnal
Published in International Journal of Sustainable Engineering, 2018
Neeraj Mehla, PhD, is an assistant professor of Mechanical Engineering at the National Institute of technology, Kurukshetra, Haryana, India. His current interests are in solar desiccant air-conditioning system, phase change materials, and solar updraft tower. Previous publications have appeared in Drying Technology, Ambient energy and Indoor and built environment, and others. The areas of interest of both authors are sustainability, solar air-conditioning, climate change and environment engineering.