Construction with plastic foam is easy and the cost is also not very high so it can be used for long-term thermal insulation. As an example, when plastic foam was applied as superficial thermal insulation on mass concrete and effect of this is excellent. Heat entry into the building through roof and walls depend on their thermal resistances. Keeping above in view, the qualitative thermal insulation replacing the existing air space in the concrete block gives better results. For determination of accurate value of overall thermal transmittance of all types of construction with or without air space, the use of Guarded Hot Box apparatus3 working as per the code IS 9403 is essentially recommended. These conditions are not normally present in the standard building construction. For most of the cases, thermal resistances apply only to air spaces of uniform thickness bounded by plane, smooth, parallel surfaces with no leakage of air to or from the space. The result of the study shows that maximum thermal insulation was found when air gap is 38mm. It is found from ASHRAE (1981)1 and a study2 made on achieving maximum thermal insulation value of the air gap. Therefore, hollow concrete blocks are used for taking advantage of air gap thermal insulation. The concrete block wall allows higher heat flow into the buildings. Combination of textiles lining system with granulated mineral wool or glass wool may work as sustainable thermal insulating system suitable for false ceiling. Thermal properties of light weight concrete using agro-industrial and forest wastes can be enhanced by creating voids/holes and put good thermal insulation by pouring or spraying into it. Suman, Principal Technical Officer, CSIR- Central Building Research Institute, Roorkee, Uttarakhand It is observed from this study that by increasing the volume of the voids (insulation) of hollow concrete block from 12% to 15 %, the heat ingress is further reduced by 22% approximately.ĭr. Similarly, 35% higher heat ingress is recorded by the layered thermal insulation used parallel to the concrete wall than the 12% insulated hollow concrete block wall. The result of the study shows that nearly one tenth heat flow of concrete block wall takes place through PUF/ EPS insulated hollow concrete block. The paper deals with use of different type of thermal insulations poured into the holes of the hollow concrete block wall and heat entry in building. Heat transfer through concrete block wall into a building is determined and comparison has been made with insulated hollow concrete block.
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