HVAC system operational strategies for reduced energy consumption in buildings with intermittent occupancy: The case of mosques

Abstract Mosques are places of worship for Muslims with unique functional requirements and operational characteristics. They are partially or fully occupied for about an hour for five intermittent periods during the day. In hot climates, maintaining indoor thermal comfort requires a considerable amount of energy that can be reduced by proper operational zoning and effective HVAC operation strategies. The objective of this paper is to investigate the impact of operational zoning and HVAC system intermittent operation strategies on the energy performance of mosques while thermal comfort is maintained. Energy simulation modeling is used for evaluating alternative zoning and HVAC operation strategies. Results indicate that up to 23% reduction in annual cooling energy is achieved by employing suitable HVAC operation strategy and system over-sizing, and 30% reduction is achieved by appropriate operational zoning. Comparing the cooling energy consumption of HVAC summer continuous operation of an un-insulated mosque with the consumption of the insulated mosque with properly oversized HVAC system operated for 1 h during each prayer, indicated that as much as 46% of cooling energy reduction can be achieved. Furthermore, utilizing proper operational zoning and HVAC operation strategies is expected to bring about an additional significant energy reduction. Guidelines for mosque HVAC systems operation and thermal zoning are developed. These design/operation guidelines would provide a source of information for professionals to improve the thermal and energy performance of mosques. This knowledge can also contribute towards the development of future energy-related design codes for mosques.

[1]  M. Fasiuddin,et al.  HVAC system strategies for energy conservation in commercial buildings in Saudi Arabia , 2011 .

[2]  I. Budaiwi,et al.  Envelope thermal design for energy savings in mosques in hot-humid climate , 2011 .

[3]  Mohammad S. Al-Homoud.  Envelope Thermal Design Optimization of Buildings with Intermittent Occupancy , 2009 .

[4]  Michael J. Brandemuehl,et al.  Optimization of air-conditioning system operating strategies for hot and humid climates , 2008 .

[5]  Mohammad S. Al-Homoud.  Optimum thermal design of office buildings , 1997 .

[6]  M. Y. Numan,et al.  The Effect of Wall-Mounted Oscillating Fan on Energy Consumption in Built Environments , 2004 .

[7]  Shinichi Tanabe,et al.  Effects of air temperature, humidity, and air movement on thermal comfort under hot and humid conditions , 1994 .

[8]  Radu Zmeureanu,et al.  Thermally acceptable temperature drifts can reduce the energy consumption for cooling in office buildings , 1992 .

[9]  Mohammad S. Al-Homoud,et al.  Assessment of monitored energy use and thermal comfort conditions in mosques in hot-humid climates , 2009 .

[10]  Xiangguo Xu,et al.  Thermal comfort in an office with intermittent air-conditioning operation , 2010 .

[11]  Kwang-Seop Chung,et al.  Improvement of intermittent central heating system of university building , 2010 .

[12]  Saudi Arabia,et al.  PERFORMANCE-BASED ENVELOPE DESIGN FOR RESIDENTIAL BUILDINGS IN HOT CLIMATES , 2007 .

[13]  Saeed A. R. Saeed,et al.  Thermal comfort requirements in hot dry regions with special reference to Riyadh Part 2: For Friday prayer , 1996 .

[14]  Mohammad S. Al-Homoud,et al.  Envelope retrofit and air-conditioning operational strategies for reduced energy consumption in mosques in hot climates , 2013 .

[15]  Mohammad S. Al-Homoud,et al.  Optimum thermal design of air-conditioned residential buildings , 1997 .

[16]  Ali A. Badran,et al.  Comparative study of continuous versus intermittent heating for local residential building: Case studies in Jordan , 2013 .

[17]  M. Zaheer-uddin,et al.  Dynamic simulation of energy management control functions for HVAC systems in buildings , 2006 .

[18]  S. A. M. Said,et al.  Energy efficiency of a building in the eastern province of Saudi Arabia: parametric analysis with DOE2.1A , 1989 .

[19]  Adnan Al Anzi,et al.  Energy Saving Opportunities Using Building Energy Simulation for a Typical Mosque in Kuwait , 2010 .

[20]  J. C. Lam,et al.  Energy performance of building envelopes in different climate zones in China , 2008 .

[21]  Standard Ashrae.  Thermal Environmental Conditions for Human Occupancy , 1992 .

[22]  Farraj F. Al-ajmi,et al.  Thermal comfort in air-conditioned mosques in the dry desert climate , 2010 .