Solar assisted, pre-cooled hybrid desiccant cooling system for Pakistan

Khalid, Anjum; Mahmood, M. Ansar; Asif, Muhammad; Muneer, Tariq

doi:10.1016/j.renene.2008.02.031

Cited by 74 publications

(19 citation statements)

References 7 publications

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“…• Process air, dehumidified by the DW (1-2), pre-cooled by the cooling air stream in an air-to-air cross-flow heat exchanger (CF, 2-3), finally cooled to the supply temperature (3-4) by a cooling coil (CC) interacting with the chiller (CH); • Regeneration air, heated by the heating coil (HC) interacting with the boiler or the storage tank (1)(2)(3)(4)(5);…”

Section: Experimental Test Facilitymentioning

confidence: 99%

“…Thermal energy to regenerate the silica-gel rotor in the desiccant-based air-handling unit is provided by a natural gas boiler (measured thermal efficiency equal to 82.8% [11]), directly interacting with the HC in the regeneration path of the AHU (Figure 4), to heat up the regeneration air (1)(2)(3)(4)(5). This is then used to regenerate the DW (5-6).…”

Section: Scenario D (Natural Gas Boiler)mentioning

confidence: 99%

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Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

et al. 2014

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Desiccant-based air handling units can achieve reductions in greenhouse gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different collector technologies (air, flat-plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance of the system with those of a desiccant-based unit where regeneration thermal energy is supplied by a natural gas boiler, and with those of a conventional air-handling unit. The only solution that allows achieving the economic feasibility of the solar desiccant cooling unit consists of 16 m 2 of evacuated solar collectors. This is able to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO2 emissions of 50.2% and 49.8%, respectively, but with a payback time of 20 years. OPEN ACCESSEnergies 2014, 7 6742

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Section: Experimental Test Facilitymentioning

confidence: 99%

Section: Scenario D (Natural Gas Boiler)mentioning

confidence: 99%

Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

et al. 2014

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“…Ideally out of 365 days in a year, more than ''300 days'' are sunny within Pakistan [88,89]. Moreover, Pakistan has remarkably favorable geographical locations and climatic conditions for bioenergy production if its vast wastelands, agricultural and lignocellulosic-rich biomass wastes are utilized properly.…”

Section: Future Directions For Biofuel Development In Pakistanmentioning

confidence: 99%

Thermophilic fermentations of lignocellulosic substrates and economics of biofuels: prospects in Pakistan

Ahmad

Qazi

2014

Int J Energy Environ Eng

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Climatic vicissitudes have laid further stress on already dwindling fossil fuels. In response to the emerging energy needs, biofuels can be considered as the safest and sustainable energy resources. At present, ethanol fermentations have been successful in fueling motor vehicles in some countries. However, with the existing population dynamic, obtaining ethanol from food competing resources/commodities might not be a desirable option. Therefore, non-food competing second-generation biofuels are the right choice to accommodate the increasing energy demand.

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“…A number of research studies on the SDCS have been reported theoretically and experimentally [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For instance, Li et al [7] investigated the performance of two-stage desiccant cooling/heating system powered by solar energy.…”

Section: Introductionmentioning

confidence: 99%

“…In another research, the application of a solar assisted heating and desiccant cooling system was examined for domestic buildings [9]. A solar assisted pre-cooled hybrid desiccant cooling system was investigated and recommended for Pakistan by Khalid et al [10]. In this study, four modes of the cooling purposes were tested.…”

Section: Introductionmentioning

confidence: 99%

Solar assisted desiccant evaporative cooling system for office buildings in Iran: a yearly simulation model

Ahmadzadehtalatapeh

2017

Scientia Iranica

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Abstract. In this research, the feasibility of solar assisted desiccant evaporative cooling system for o ce buildings was studied. An o ce building located in Chabahar, Iran, as a high cooling load demanding region, was considered as the case study. Di erent con gurations as desiccant-based cooling systems were examined to determine the most appropriate con guration in terms of established indoor air conditions and required cooling energy. The con gurations were simulated hourly, and the monthly mean values were determined. TRNSYS software was used for this purpose. The results indicated that the desiccant-based cooling system operating in the recirculation cycle with precooling Con g. E has the potential to keep the indoor air conditions within the standard recommendations. In addition, it was shown that Con g. E is the superior con guration in terms of the energy performance and can meet the cooling energy requirements of the space. The potential for providing the desiccant regeneration heat by the solar energy was also investigated. Three standard solar thermal panels were explored to propose the most proper array plant. The study showed that an array of solar panels, consisting of two rows of four unglazed solar thermal collectors, could meet the heat energy requirement by the regenerating process.

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Solar assisted, pre-cooled hybrid desiccant cooling system for Pakistan

Cited by 74 publications

References 7 publications

Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

Thermophilic fermentations of lignocellulosic substrates and economics of biofuels: prospects in Pakistan

Solar assisted desiccant evaporative cooling system for office buildings in Iran: a yearly simulation model

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