Experimental and numerical studies of reducing cooling load of lecture hall

Muhieldeen, Mohammed W.; Adam, Nor Mariah; Salman, B.H.

doi:10.1016/j.enbuild.2014.12.026

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…The cost saving is also purely from the use of thermal insulation itself without any cooling load such as fans and air conditioning. Therefore, for actual room with bricks and cements, the reduction of the heat flux will be increased along with high energy saving [3][4][5]12].…”

Section: Resultsmentioning

confidence: 99%

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Analysis of Optimum Thickness of Glass Wool Roof Thermal Insulation Performance

Muhieldeen

Yang

Lye³

et al. 2020

ARFMTS

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Countries in south east Asia are mostly experiencing tropical climate conditions. Therefore, the use of the air conditioning has been increased to reduce the tension and achieve thermal comfort inside the buildings. In order to reduce the energy consumption, thermal insulation has been introduced to lower down the indoor temperature. The main objective of this study is to determine the optimum thickness of the glass wool insulation. To conduct the study, a wooden room model is built based on the classroom that located at one of the Malaysian universities. The thicknesses of the glass wool insulation used in the experiment is 25 mm (one layer), 50 mm (two layers) and 75 mm (three layers). According to the results, the maximum temperature reduction for one layer of insulation is 1.0°C. Two layers of insulation reduces the indoor temperature by 1.3°C followed by the reduction of 1.5°C after applying three layers of insulation. The convection coefficient outside and inside is determined to calculate the heat flux of the roof with different insulation thickness. The heat flux gained by the roof reaches the highest value at 1 pm which is 0.648 W/m² without insulation. The heat flux has been reduced to 0.629 W/m² after applying one layer of glass wool insulation. The heat flux gained by the roof is further reduced to 0.573 W/m² and 0.518 W/m² when two and three layers of insulation are applied, respectively. Throughout the experiment, the temperature inside the room is reduced with the increase of the insulation thickness. Two layers of glass wool insulation has been selected as the optimum insulation thickness which is validated after performing calculation using the polynomial function as well as the cost analysis. Two layers of glass wool insulation yields a 27.40% of ROI per annum.

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Section: Resultsmentioning

confidence: 99%

“…Roofs take up the maximum direct solar radiation compared to other physical components of a building [10]. Roofs account for nearly 70% of heat gain of a building [11][12]. The heat gained by the roof during the day is transmitted through and trapped in the attic.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Optimum Thickness of Glass Wool Roof Thermal Insulation Performance

Muhieldeen

Yang

Lye³

et al. 2020

ARFMTS

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“…The key principle of thermal insulation materials has been to reduce heat transfer from/to surfaces for a long time. An experimental study was done by Muhieldeen et al, [3] in Malaysia showed the efficiency of Polyethylene Aluminum Single Bubble (PASB) as an insulator and achieved a 2.7 °C reduction. The majority of the study conducted by several authors is based on building insulation for heating and cooling as well as the thermal comfort inside the buildings [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…An experimental study was done by Muhieldeen et al, [3] in Malaysia showed the efficiency of Polyethylene Aluminum Single Bubble (PASB) as an insulator and achieved a 2.7 °C reduction. The majority of the study conducted by several authors is based on building insulation for heating and cooling as well as the thermal comfort inside the buildings [3][4][5][6][7][8][9][10]. Although the study conducted by Bahadori and Vuthaluru [11], Öztürk et al, [12], Alawadhi [13], Chou [14], Kalyon and Sahin [15], Keçebaş et al, [16], Wechsatol et al, [17], Zaki and Al-Turki [18], Kayfeci [19], Muhieldeen et al, [20], and Muhieldeen et al, [21] is concentrating on pipeline insulation due to the significant potential for energy savings.…”

Section: Introductionmentioning

confidence: 99%

The Optimum Thickness of Rockwool as Roof Thermal Insulation: An Experimental and Numerical Study

Muhieldeen

Lim²,

Kassim

et al. 2021

ARFMTS

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Now a days, the global warming has increased the temperature in the environment that forced the building occupant to get assisting from the air condition to reduce the heat tension inside the building, this could increase the electricity bill amount. The aim of this study is to measure the optimum thickness of Rockwool insulation to experimentally and numerically to reduce the heating load inside the buildings. Two devices have been used through this research, Infrared Thermometer to measure profile temperature of the walls along with VELOCICALC to measure the air temperature and air velocity. Three different layers of Rockwool insulation have been applied on the roof of wooden room. The data present the two layers thickness of Rockwool is the best selection to reduce the heating load inside the room, the differential between outside and inside is 0.9 °C, the Rockwool of one layer reduced only 0.5 °C and the maximum thickness with three layers reduced only 1 °C, which is not much effective compared to the two layers but even more costly. CFD analysis shows agreement with the experimental result. The results shows if the dimensions of a UCSI lecture room is to be considered, then applying Rockwool insulation with a thickness of 100 mm would cost around RM 1520 as a UCSI lecture room is of 8 m width and 9 m length. However, two layers of Rock wool insulation could save around 29.30% of ROI per annum.

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“…In the 1910s, with the introduction of the first HVAC (heating, ventilation, and air-conditioning) systems in buildings [10], major concerns about the thermal insulation of buildings have emerged. Several approaches were considered, namely ETICS (external thermal insulation composite systems) with numerical [11], and experimental studies [12], which confirms its benefits in terms of thermal comfort and reduction of initial and operative costs in air conditioning [13]. Also, multilayer façades can be considered [14], such as a double-wall façade with and without thermal insulation [15], or a ventilated façade able to reverse the heat flux through the building envelope and reduce the indoor heating demand [16], among others.…”

Section: Introductionmentioning

confidence: 99%

Total Solar Reflectance Optimization of the External Paint Coat in Residential Buildings Located in Mediterranean Climates

Souto¹,

Almeida

Leal

et al. 2020

Energies

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This work addresses the effect of the total solar reflectance (TSR) value of paints applied in residential buildings upon their thermal performance. A semi-detached residential building was modeled in the ESP-r software, and taken as the basis for parametric studies which assessed the effects of variations in (i) the TSR values; (ii) the thermal characteristics of the building envelope; (iii) the location/climate; and: (iv) the way how the indoor temperature is controlled. The parametric studies were used to find optimal TSR values for each combination of Location + Building envelope characteristics (mainly the existence of thermal insulation). It was concluded that paints having a carefully chosen TSR value lead to better indoor thermal temperatures if the buildings have no mechanical heating or cooling, or to energy savings of up to 32% if they do.

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Experimental and numerical studies of reducing cooling load of lecture hall

Cited by 11 publications

References 20 publications

Analysis of Optimum Thickness of Glass Wool Roof Thermal Insulation Performance

Analysis of Optimum Thickness of Glass Wool Roof Thermal Insulation Performance

The Optimum Thickness of Rockwool as Roof Thermal Insulation: An Experimental and Numerical Study

Total Solar Reflectance Optimization of the External Paint Coat in Residential Buildings Located in Mediterranean Climates

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