Siti Halipah Ibrahim

Renewable Night Cooled Chill Water Source for Energy Efficient Indoor Radiant Cooling

This study investigates cooling of water at night in Malaysian climate as renewable cooling medium source for radiant cooling purpose. An experiment with a 1.95 m2 steel roof rig structure was constructed and night cooling cycle was conducted during the hot season and cold season of the year. Regression model was developed to predict water temperature after the night cooling process and the corresponding water and roof ratio was established. An annual simulation of a low income home model retrofitted with radiant cooling system charged by night cooled water as cooling medium shows that 99% of the time the thermal condition could meet ISO 7730 category C PMV between-0.7 and + 0.7 . For an outdoor ASHRAE design day condition, the peak indoor operative temperature of 37oC could be lowered to about 30oC with the use of radiant cooling system. The calculated energy saving for the home model was 85% or about 15% of the conventional air system operating cost.

Building Sustainable Design Performance Through Integrated Value Management Practice

Maintenance management is a combination of all technical and administrative actions, including supervision actions, intended to retain an item in or restore it to a state in which it can perform a required function. Value management is a proactive, creative, problem-solving service, utilizing a multi-disciplinary team-oriented plan of attack to make explicit the client’s value system using functional analysis to discover the relationship between time, cost and quality with the aim of maximizing the overall operation of an establishment. Both of them are interrelated with each other for improving building performance. Alas, lack of a thorough review of design and specification has thus created so many faults and defects during the conception and construction stages in which resulted later in high upkeep costs. For overcoming that issue, this paper will explore the potential of VM approach during the conception phase of bringing on a perfect (fewer defects) design specification of a building. The standard procedure of VM methodology practice which has involved a multidisciplinary project stakeholders in order to avoid the issue over design and unnecessary maintenance costs will be concluded as well.

A review study of maintenance and management issues in Malaysian commercial building towards sustainable future practice

Good management of the building will be able to influence the quality of the buildings that remain long, safe and beautiful without any damage and problems. This research paper aims to explore the issue of maintenance and management that appear in managing the commercial building in Malaysian construction and property industry. The data in this research has been gathered through the reviewing process of secondary data such as journals, proceeding, thesis etc. in the area that related to maintenance and management issue in commercial building. As highlighted by previous study, building a good management can ensure that the facilities available in the building are well and meet the standard. Thus, exposure to the problems and needs in the management of the building would be able to improve the quality of building management systems to be more effective and fulfil the client needs and features.

A proposal for improving sustainability practice through the implementations of reuse and recycle technique in Malaysian construction industry

Construction and demolition waste is often seen as the major contributor to the solid waste stream that is going to landfill, hence, making it the area of focus for improvement. In the construction industry, reuse and recycle principles have been promoted in order to reduce waste and protect the environment. Construction and demolition waste including demolished concrete, bricks and masonry, wood and other materials such as dry wall, glass, insulation, roofing, wire, pipe, rock and soil constitute a significant component of the total waste. Without proper reuse and recycle policies, these construction and demolition wastes would quickly fill all the remaining landfill space, which has already been growing in scarce around this region. Based on the feedback received, on average, a third of respondents said they currently have a lotto benefit from the use of reduce and reuse. In addition, they also agreed that the existing policies help and support the min carrying out the reduce and reuse practices. Respon...

Nocturnal Cooling of Water as Free Cooling Source for Building Indoor Radiant Cooling in Malaysian Climate

Normally mechanical chiller supplies chill water temperature at a higher operating temperature to charge a radiant cooling system in building. Other source of cooling is possible since the operating temperature for radiant cooling is limited by the air dew point temperature. This study investigates cooling of water through long wave radiation to the night sky in Kuching Sarawak, Malaysia and utilise this water for radiant cooling purpose. Mathematical model were developed to predict the cooling power of the nocturnal cooling over typical metal roof and was compared to an experimental data. The measurement from the test model verified the predicted data and a yearly potential from nocturnal cooling in this region was established. The amount of cooled water generated from this night cooling system was also calculated. Results showed that an average of 73 W/m2 nocturnal cooling power is possible in this region.