Efficiency Validation of Hybrid Cooling Application in Hot and Humid Climate Houses of KSA

Authors: Jamil Hijazi, Stirling Howieson

Abstract:

Reducing energy consumption and CO₂ emissions are probably the greatest challenge now facing mankind. From considerations surrounding global warming and CO₂ production, it has to be recognized that oil is a finite resource and the KSA like many other oil-rich countries will have to start to consider a horizon where hydro-carbons are not the dominant energy resource. The employment of hybrid ground-cooling pipes in combination with the black body solar collection and radiant night cooling systems may have the potential to displace a significant proportion of oil currently used to run conventional air conditioning plant. This paper presents an investigation into the viability of such hybrid systems with the specific aim of reducing cooling load and carbon emissions while providing all year-round thermal comfort in a typical Saudi Arabian urban housing block. Soil temperatures were measured in the city of Jeddah. A parametric study then was carried out by computational simulation software (DesignBuilder) that utilized the field measurements and predicted the cooling energy consumption of both a base case and an ideal scenario (typical block retro-fitted with insulation, solar shading, ground pipes integrated with hypocaust floor slabs/stack ventilation and radiant cooling pipes embed in floor). Initial simulation results suggest that careful ‘ecological design’ combined with hybrid radiant and ground pipe cooling techniques can displace air conditioning systems, producing significant cost and carbon savings (both capital and running) without appreciable deprivation of amenity.

Keywords: Cooling load, energy efficiency, ground pipe cooling, hybrid cooling strategy, hydronic radiant systems, low carbon emission, passive designs, thermal comfort.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1314508

References:

REFERENCES
[1] EIA, U.S. Energy Information Administration, Office of Energy Statistics-Washington, DC 20585. - The Annual Energy Review “Country Analysis Brief: Saudi Arabia “Last Updated: September 10, 2014-pp.4-14.
[2] Saudi Arabia Energy Efficiency Report; 2013و Last Updated: April 26, 2014 pp. 16-38.
[3] Saudi Electricity Company” Annual Report 2014” 12-31, retrieved 2015-08-30.
[4] Al-Ajlan SA, Al-Ibrahim AM, Abdulkhaleq M, Alghamdi F. Developing sustainable energy policies for electrical energy conservation in Saudi Arabia. Energy Policy 2006; 34(13):1556–65.
[5] World Bank Data - CO2 emissions (metric tons per capita), currently includes 2013 data World Per Capita Carbon Dioxide Emissions - exhaustive and up to date list of statistic by country from 2013.
[6] Homod R. Z., Energy saving by integrated control of natural ventilation and HVAC systems using model guide for comparison. Renew Energy 2014; 71:639–50.
[7] Chua KJ, Yan J. Achieving better energy-efficient air conditioning – a review of technologies and strategies. Appl Energy 2013; 104:87–104.
[8] Wan J. W., An energy efficient air-conditioning system with an exhaust fan integrated with a supply fan. Energy Build 2009; 41 (12):1299–305.
[9] Nosrat A. H., Improved performance of hybrid photovoltaic-trigeneration systems over photovoltaic-cogen systems including effects of battery storage. Energy 2013; vol. 49:366–74.
[10] Parameswaran R, Kalaiselvam S. Energy efficient hybrid nano-composite-based cool thermal storage air conditioning system for sustainable buildings. Energy 2013; 59:194–214.
[11] Stavrakakis GM, Zervas PL, Sarimveis H, Markatos NC. Development of a computational tool to quantify architectural-design effects on thermal comfort in naturally ventilated rural houses. Build Environ 2010; 45(1):65– 80.
[12] Givoni B. Indoor temperature reduction by passive cooling systems. Sol Energy 2011; 85(8):1692–726.
[13] Kamal MA. An overview of passive cooling techniques in buildings: design concepts and architectural interventions. Acta Tech Napoc Civ Eng Arch 2012; 55(1):84–97.
[14] Maleki BA. Shading: passive cooling and energy conservation in buildings. Int J Tech Phys Probl Eng 2011; 3(4):72–9.
[15] Al-Shaalan AM, Ahmed W, Alohaly A. Design guidelines for buildings in Saudi Arabia considering energy conservation requirements. Appl Mech Mater 2014; 548 549:1601–6.
[16] ASHRAE Standard 62, 2007, ASHRAE Standard 62–2007, Ventilation for acceptable indoor air quality. Atlanta: American Society of Heating and Refrigerating and Air-Conditioning Engineers Inc.