Nawaf al-Mutawa - Academia.edu (original) (raw)

Papers by Nawaf al-Mutawa

Research paper thumbnail of Exergetic, Exergoeconomic and Exergoenvironmental Analysis of Intercooled Gas Turbine Engine

52nd AIAA/SAE/ASEE Joint Propulsion Conference, 2016

Research paper thumbnail of Energetic and exergetic analysis of cogeneration power combined cycle and ME-TVC-MED water desalination plant: part-1 operation and performance

Applied Thermal Engineering, 2016

Research paper thumbnail of Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

Research paper thumbnail of Investigating the Applicability of Different Thermal Comfort Models in Kuwait Classrooms Operated in Hybrid Air-Conditioning Mode

Sustainability in Energy and Buildings, 2009

A field study to investigate the applicability of different thermal comfort indices was conducted... more A field study to investigate the applicability of different thermal comfort indices was conducted for Kuwait classrooms under naturally ventilated environment, to assess the thermal conditions during the school day. In Kuwait, the girls' and boys' schools are completely segregated in all academic levels, thus offering a wide range to investigate the differences in thermal comfort sensations between both genders.

Research paper thumbnail of Evaluation of Human Thermal Comfort in Offices in Kuwait and Assessment of the Applicability of the Standard PMV Model

Research paper thumbnail of Impact of ventilation modes on carbon dioxide concentration levels in Kuwait classrooms

Energy and Buildings, 2012

The influence of ventilation mode on classroom air quality in the State of Kuwait is reported. In... more The influence of ventilation mode on classroom air quality in the State of Kuwait is reported. In this field study, CO 2 concentration levels were measured during natural and air-conditioned ventilation modes inside 10 elementary-level classrooms in three Kuwaiti schools occupied by children in the 6-10 years age group. The findings show that these classrooms have lower average CO 2 concentration levels (708 ppm) during the natural ventilation mode compared to that in the air-conditioned mode (1596 ppm). The latter CO 2 concentrations are higher than recommended in several standards, and suggest that classrooms operation in the air-conditioned mode requires further investigation. Air-conditioning is provided by wall-mounted split units that do not directly introduce fresh air to the space, so some form of appropriate additional ventilation is suggested. Following rapid and extensive national refurbishment of schools in the early 1990s, these types of installations are widespread, and results found here may apply elsewhere in Kuwait.

Research paper thumbnail of A comparison of methods for assessing the thermal insulation value of children’s schoolwear in Kuwait

Applied Ergonomics, 2012

In this study, three methods were used to determine the thermal insulation values of different sc... more In this study, three methods were used to determine the thermal insulation values of different school clothing worn by 6 to 17 year old girls and boys in Kuwait classrooms for both summer and winter seasons. The different clothing ensembles' insulations were determined by 1: measurement using adultsized versions of the clothing on thermal manikins, 2: estimations from adult clothing data obtained from the standards tables in ISO 9920 and ASHRAE 55, and 3: calculations using a regression equation from that was adapted to accommodate children's sizes for ages 6e17 years. Values for the clothing area factor, f cl , were also determined by measurement and by using a prediction equation from ISO 9920.

Research paper thumbnail of Effect of pre-cooling of inlet air to condensers of air-conditioning units

International Journal of Energy Research, 2005

Energy conservation and increase in performance of air-conditioning systems could be achieved by ... more Energy conservation and increase in performance of air-conditioning systems could be achieved by precooling the air intake of the condensers. This paper experiments three different methods of pre-cooling the condenser air; the cooling pad (CP) setup, the cooling mesh (CM) setup and the shading setup. The CP and CM setups are two different methods of evaporatively cooling the air. The three methods have been applied to three identical, 2.8 tons, split air-conditioning units during the peak summer time period in Kuwait, under ambient temperatures ranging from 39 to 458C. The results yielded a drop in the power consumption ranging from 8.1 to 20.5% and an increase in the cooling load ranging from 6.4 to 7.8% by using the CP and CM setups, which, in turn, resulted in an increase in the coefficient of performance (COP) of the units by 36-59%. The shading setup has resulted in an increase of power consumption due to air trapped below the shaded area, which resulted in heat being generated.

Research paper thumbnail of Exergetic, Exergoeconomic and Exergoenvironmental Analysis of Intercooled Gas Turbine Engine

52nd AIAA/SAE/ASEE Joint Propulsion Conference, 2016

Research paper thumbnail of Energetic and exergetic analysis of cogeneration power combined cycle and ME-TVC-MED water desalination plant: part-1 operation and performance

Applied Thermal Engineering, 2016

Research paper thumbnail of Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

Research paper thumbnail of Investigating the Applicability of Different Thermal Comfort Models in Kuwait Classrooms Operated in Hybrid Air-Conditioning Mode

Sustainability in Energy and Buildings, 2009

A field study to investigate the applicability of different thermal comfort indices was conducted... more A field study to investigate the applicability of different thermal comfort indices was conducted for Kuwait classrooms under naturally ventilated environment, to assess the thermal conditions during the school day. In Kuwait, the girls' and boys' schools are completely segregated in all academic levels, thus offering a wide range to investigate the differences in thermal comfort sensations between both genders.

Research paper thumbnail of Evaluation of Human Thermal Comfort in Offices in Kuwait and Assessment of the Applicability of the Standard PMV Model

Research paper thumbnail of Impact of ventilation modes on carbon dioxide concentration levels in Kuwait classrooms

Energy and Buildings, 2012

The influence of ventilation mode on classroom air quality in the State of Kuwait is reported. In... more The influence of ventilation mode on classroom air quality in the State of Kuwait is reported. In this field study, CO 2 concentration levels were measured during natural and air-conditioned ventilation modes inside 10 elementary-level classrooms in three Kuwaiti schools occupied by children in the 6-10 years age group. The findings show that these classrooms have lower average CO 2 concentration levels (708 ppm) during the natural ventilation mode compared to that in the air-conditioned mode (1596 ppm). The latter CO 2 concentrations are higher than recommended in several standards, and suggest that classrooms operation in the air-conditioned mode requires further investigation. Air-conditioning is provided by wall-mounted split units that do not directly introduce fresh air to the space, so some form of appropriate additional ventilation is suggested. Following rapid and extensive national refurbishment of schools in the early 1990s, these types of installations are widespread, and results found here may apply elsewhere in Kuwait.

Research paper thumbnail of A comparison of methods for assessing the thermal insulation value of children’s schoolwear in Kuwait

Applied Ergonomics, 2012

In this study, three methods were used to determine the thermal insulation values of different sc... more In this study, three methods were used to determine the thermal insulation values of different school clothing worn by 6 to 17 year old girls and boys in Kuwait classrooms for both summer and winter seasons. The different clothing ensembles' insulations were determined by 1: measurement using adultsized versions of the clothing on thermal manikins, 2: estimations from adult clothing data obtained from the standards tables in ISO 9920 and ASHRAE 55, and 3: calculations using a regression equation from that was adapted to accommodate children's sizes for ages 6e17 years. Values for the clothing area factor, f cl , were also determined by measurement and by using a prediction equation from ISO 9920.

Research paper thumbnail of Effect of pre-cooling of inlet air to condensers of air-conditioning units

International Journal of Energy Research, 2005

Energy conservation and increase in performance of air-conditioning systems could be achieved by ... more Energy conservation and increase in performance of air-conditioning systems could be achieved by precooling the air intake of the condensers. This paper experiments three different methods of pre-cooling the condenser air; the cooling pad (CP) setup, the cooling mesh (CM) setup and the shading setup. The CP and CM setups are two different methods of evaporatively cooling the air. The three methods have been applied to three identical, 2.8 tons, split air-conditioning units during the peak summer time period in Kuwait, under ambient temperatures ranging from 39 to 458C. The results yielded a drop in the power consumption ranging from 8.1 to 20.5% and an increase in the cooling load ranging from 6.4 to 7.8% by using the CP and CM setups, which, in turn, resulted in an increase in the coefficient of performance (COP) of the units by 36-59%. The shading setup has resulted in an increase of power consumption due to air trapped below the shaded area, which resulted in heat being generated.