This page has only limited features, please log in for full access.

Mr. Ammar Dehwah
University of Colorado Boulder

Basic Info


Research Keywords & Expertise

0 Indoor Air Quality
0 Building energy performance
0 Renewable energy (Building Integrated Photovoltaic BIPV)
0 Energy Efficiency in Buildings
0 Adaptive building envelope

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 02 December 2020 in Sustainability
Reads 0
Downloads 0

The application of renewable energy has been an integral part of the sustainability drive in the building sector and solar photovoltaic (PV) is one of the most effective technologies in this respect. The present study aims to investigate the prospects of solar PV in residential buildings in the hot–humid climatic conditions. The study discusses the utilization of building roofs for the application of PV in terms of potential hurdles and utilization factor (UF). Technical performance of PV systems has also been investigated in terms of power output as well as the energy saved as a result of the shading impact of panels for two types of residential units, apartments and villas. Investigation of 70 sample residential buildings reveals the average UF of 0.21 and 0.28 for apartments and villas, respectively. For the case study of apartment and villa residential units, roof UF has been found to be 13% and 15% with a respective PV output of 6079 kWh/year and 6162 kWh/year. Potential PV output at the city level has also been estimated. A sensitivity analysis has been conducted to evaluate the impact of various cost and design parameters on the viability of PV systems.

ACS Style

Ammar Dehwah; Muhammad Asif; Ismail Budaiwi; Adel Alshibani. Techno-Economic Assessment of Rooftop PV Systems in Residential Buildings in Hot–Humid Climates. Sustainability 2020, 12, 10060 .

AMA Style

Ammar Dehwah, Muhammad Asif, Ismail Budaiwi, Adel Alshibani. Techno-Economic Assessment of Rooftop PV Systems in Residential Buildings in Hot–Humid Climates. Sustainability. 2020; 12 (23):10060.

Chicago/Turabian Style

Ammar Dehwah; Muhammad Asif; Ismail Budaiwi; Adel Alshibani. 2020. "Techno-Economic Assessment of Rooftop PV Systems in Residential Buildings in Hot–Humid Climates." Sustainability 12, no. 23: 10060.

Journal article
Published: 21 October 2020 in ASME Journal of Engineering for Sustainable Buildings and Cities
Reads 0
Downloads 0

Switchable building envelope systems, including passive and active systems, have recently seen an increase interest in the literature. Unlike static insulation, switchable insulation systems (SISs) have the ability to adjust the thermal properties of envelope elements. Advanced control strategies for SISs are evaluated in this analysis using genetic algorithm-based optimization techniques. In particular, this study investigates the potential heating and cooling energy savings for deploying optimal controls specific to SIS technologies when applied to residential roofs located in representative US climates. Moreover, energy use and peak demand savings obtained by optimal controls are compared with those obtained from the 2-step rule-based controls. Overall, the analysis results indicate that the maximum monthly additional savings obtained by optimal controls can reach up to 32% compared with 2-step rule sets when an annual analysis is conducted for a residential building located in Golden, CO.

ACS Style

Ammar H. A. Dehwah; Moncef Krarti. Optimal Control Strategies for Switchable Roof Insulation Systems Applied to US Residential Buildings. ASME Journal of Engineering for Sustainable Buildings and Cities 2020, 1, 1 -29.

AMA Style

Ammar H. A. Dehwah, Moncef Krarti. Optimal Control Strategies for Switchable Roof Insulation Systems Applied to US Residential Buildings. ASME Journal of Engineering for Sustainable Buildings and Cities. 2020; 1 (4):1-29.

Chicago/Turabian Style

Ammar H. A. Dehwah; Moncef Krarti. 2020. "Optimal Control Strategies for Switchable Roof Insulation Systems Applied to US Residential Buildings." ASME Journal of Engineering for Sustainable Buildings and Cities 1, no. 4: 1-29.

Journal article
Published: 20 May 2019 in Journal of Solar Energy Engineering
Reads 0
Downloads 0

To meet the increasing energy demand and to shave the peak, the Kingdom of Saudi Arabia (KSA) is currently planning to invest more on renewable energy (RE) seeking diversity of energy resources. Through the integration of demand-side management measures and renewable energy distributed generation (DG) systems, the study outlined in this paper aims at investigating the potential of hybrid renewable energy systems in supplying energy demands for residential communities in an oil-rich country. The residential community considered in this study, located in the eastern region of KSA, has an annual electrical usage of 1174 GWh and an electrical peak load of 335 MW that are met solely by the grid. The results of the analyses indicated that the implementation of cost-effective energy efficiency measures (EEMs) reduced the electricity usage by 38% and peak demand by 51% as well as CO2 emissions by 38%. Although the analysis of the hybrid systems showed that purchasing electricity from the grid is the best option with a levelized cost of energy (LCOE) of $0.1/kWh based on the current renewable energy market and economic conditions of KSA, RE systems can be cost-effective to meet the loads of the residential communities under specific electricity prices and capital cost levels.

ACS Style

Ammar H. A. Dehwah; Moncef Krarti. Optimal Hybrid Power Energy Systems for Residential Communities in Saudi Arabia. Journal of Solar Energy Engineering 2019, 141, 061002 -19.

AMA Style

Ammar H. A. Dehwah, Moncef Krarti. Optimal Hybrid Power Energy Systems for Residential Communities in Saudi Arabia. Journal of Solar Energy Engineering. 2019; 141 (6):061002-19.

Chicago/Turabian Style

Ammar H. A. Dehwah; Moncef Krarti. 2019. "Optimal Hybrid Power Energy Systems for Residential Communities in Saudi Arabia." Journal of Solar Energy Engineering 141, no. 6: 061002-19.

Journal article
Published: 24 August 2018 in Renewable Energy
Reads 0
Downloads 0

The study aims to investigate the overall impact of rooftop photovoltaic (PV) systems on the energy performance of residential buildings in hot-humid climates. The study area spans over 100 km2 encompassing 33,000 residential units in the city of Al-Khobar in Saudi Arabia. It examines the restrictions towards the utilizability of building rooftops for PV application. The total building rooftop area and its corresponding PV output at the urban scale level has been estimated with the help of geographic information systems and PV simulation tools. The secondary contribution by PV in terms of heat gain reduction has also been investigated through EnergyPlus simulation engine. It is found that villas and apartment buildings respectively offer 21% and 28% of their rooftops for PV application. Results suggest that solar PV can offset 19% of the electricity demand when 25% of the building roof is utilized, in addition to a cooling load reduction of 2% due to the shading effect of panels. For the total study area, the annual electricity generation potential for tilted and flat application of PV with the existing roofs conditions turns out to be 797 GWh and 757 GWh respectively.

ACS Style

Ammar H.A. Dehwah; Muhammad Asif. Assessment of net energy contribution to buildings by rooftop photovoltaic systems in hot-humid climates. Renewable Energy 2018, 131, 1288 -1299.

AMA Style

Ammar H.A. Dehwah, Muhammad Asif. Assessment of net energy contribution to buildings by rooftop photovoltaic systems in hot-humid climates. Renewable Energy. 2018; 131 ():1288-1299.

Chicago/Turabian Style

Ammar H.A. Dehwah; Muhammad Asif. 2018. "Assessment of net energy contribution to buildings by rooftop photovoltaic systems in hot-humid climates." Renewable Energy 131, no. : 1288-1299.

Journal article
Published: 07 April 2018 in Energy and Buildings
Reads 0
Downloads 0

The study aims to investigate the potential for rooftop application of solar PV in the residential sector of the Kingdom of Saudi Arabia (KSA) taking into account the two main types of buildings i.e. apartments and villas. It is the first detailed study in KSA which focuses on the utilizability of building rooftops considering various structural, services and cultural parameters. The work employs remote sensing and GIS techniques to gather the building rooftop data for a district in the city of Al-Khubar covering 33,000 residential units. The data was validated through site visits of sampled buildings and regression models were created to examine the relationships between PV areas and the roof areas in the study area. PVSOL software was then used to model the application of PV on building rooftops and to determine the impact of shading. Frequency of occurrence of hurdles impacting the application of PV has been determined. It is found that currently 21% and 28% of the respective apartment and villa rooftops can be effectively used for PV application. The total rooftops in the study area amounting to 14.21 km2 are estimated to annually deliver 796 GWh of PV electricity. The work also concludes that through policy intervention the utilizability of rooftops and subsequent power output can be increased by 22.5%. Owing to similarities in structural and architectural features, the regression models and the findings of the study can be used and applied to the building sectors across all of the countries in the GCC region.

ACS Style

Ammar H.A. Dehwah; Muhammad Asif; Muhammad Tauhidur Rahman. Prospects of PV application in unregulated building rooftops in developing countries: A perspective from Saudi Arabia. Energy and Buildings 2018, 171, 76 -87.

AMA Style

Ammar H.A. Dehwah, Muhammad Asif, Muhammad Tauhidur Rahman. Prospects of PV application in unregulated building rooftops in developing countries: A perspective from Saudi Arabia. Energy and Buildings. 2018; 171 ():76-87.

Chicago/Turabian Style

Ammar H.A. Dehwah; Muhammad Asif; Muhammad Tauhidur Rahman. 2018. "Prospects of PV application in unregulated building rooftops in developing countries: A perspective from Saudi Arabia." Energy and Buildings 171, no. : 76-87.