Maryam Karami - Academia.edu (original) (raw)
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National University of Singapore
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Papers by Maryam Karami
Energy and Buildings, 2010
International Journal of Refrigeration-revue Internationale Du Froid, 2009
Heat transfer Comparison Experiment a b s t r a c t Cooling towers are used to cool a warm water ... more Heat transfer Comparison Experiment a b s t r a c t Cooling towers are used to cool a warm water stream through evaporation of part of the water into an air stream. A cooling tower consists of three zones; namely spray, packing and rain zones. In cooling towers, a significant portion of the total heat rejected may occur in the spray and rain zones. These zones are modeled and solved numerically using a computer code. The developed models of these zones are validated against experimental data. For the case study under consideration, the error in calculation of the tower volume is 1.5% when the spray and rain zones are neglected. This error is reduced to 1.1% and 0.25% as the spray and rain zones are incorporated in the model, respectively. Furthermore, the effect of the Lewis factor on the performance prediction of wet-cooling towers is investigated using Bosnjakovic equation.
Energy and Buildings, 2010
Energy consumption in buildings is heavily affected by climate change. It causes significant vari... more Energy consumption in buildings is heavily affected by climate change. It causes significant variations of the outdoor design conditions, cooling and heating loads. In this paper, a total of 40 years (19672006) of hourly temperature data were considered in four decades and ...
Energy and Buildings, 2010
The performance of indirect evaporative cooling system (IEC) to pre-cool air for a conventional m... more The performance of indirect evaporative cooling system (IEC) to pre-cool air for a conventional mechanical cooling system has been investigated for four cities of Iran. For this purpose, a combined experimental setup consisting of an IEC unit followed by a packaged unit air conditioner (PUA) was designed, constructed and tested. Two air simulators were designed and used to simulate indoor heating load and outdoor design conditions. Using of experimental data and an appropriate analytical method, the performance and energy reduction capability of combined system has been evaluated through the cooling season. The results indicate IEC can reduce cooling load up to 75% during cooling seasons. Also, 55% reduction in electrical energy consumption of PUA can be obtained.
Energy and Buildings, 2010
International Journal of Refrigeration-revue Internationale Du Froid, 2009
Heat transfer Comparison Experiment a b s t r a c t Cooling towers are used to cool a warm water ... more Heat transfer Comparison Experiment a b s t r a c t Cooling towers are used to cool a warm water stream through evaporation of part of the water into an air stream. A cooling tower consists of three zones; namely spray, packing and rain zones. In cooling towers, a significant portion of the total heat rejected may occur in the spray and rain zones. These zones are modeled and solved numerically using a computer code. The developed models of these zones are validated against experimental data. For the case study under consideration, the error in calculation of the tower volume is 1.5% when the spray and rain zones are neglected. This error is reduced to 1.1% and 0.25% as the spray and rain zones are incorporated in the model, respectively. Furthermore, the effect of the Lewis factor on the performance prediction of wet-cooling towers is investigated using Bosnjakovic equation.
Energy and Buildings, 2010
Energy consumption in buildings is heavily affected by climate change. It causes significant vari... more Energy consumption in buildings is heavily affected by climate change. It causes significant variations of the outdoor design conditions, cooling and heating loads. In this paper, a total of 40 years (19672006) of hourly temperature data were considered in four decades and ...
Energy and Buildings, 2010
The performance of indirect evaporative cooling system (IEC) to pre-cool air for a conventional m... more The performance of indirect evaporative cooling system (IEC) to pre-cool air for a conventional mechanical cooling system has been investigated for four cities of Iran. For this purpose, a combined experimental setup consisting of an IEC unit followed by a packaged unit air conditioner (PUA) was designed, constructed and tested. Two air simulators were designed and used to simulate indoor heating load and outdoor design conditions. Using of experimental data and an appropriate analytical method, the performance and energy reduction capability of combined system has been evaluated through the cooling season. The results indicate IEC can reduce cooling load up to 75% during cooling seasons. Also, 55% reduction in electrical energy consumption of PUA can be obtained.