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Concrete In Australia : December 2010
Concrete in Australia Vol 36 No 4 25 Arabia that is airconditioned using a Termodeck installation. e cooling was totally switched off between 1:00pm and 5:00pm. During the test the temperatures in all rooms in the office except one remained at under 25°C, while the outside temperature at midday was around 44°C. e occupants were not informed of the system switch off, but reported no change in their working environment. e conclusion of this test together with detailed simulations is that most buildings equipped with Termodeck should be able to reduce the power demand during peak hours by 70-90% compared to conventional airconditioning systems. e installed cooling capacities (including standby) for some other Termodeck projects in the Middle East have been compared with the design capacities that would have been required from conventional airconditioning systems. e capacities, and therefore electrical power, were found to be 50-60% lower for the Termodeck system. Experience from Termodeck projects in the Middle East demonstrates that the energy consumption is reduced by 30-50% compared to equally sized conventional buildings. is difference is due to the fact that the chillers are running at nights when the ambient temperature is lower; free cooling is achieved by using the outdoor air without any need for compressors during periods when nights are cold. In addition, during very cold periods Termodeck uses the surplus heat stored in the slab during daytime to heat the building at night. During peak hours, the electrical power used by a Termodeck installation can be up to 70-90% less than with conventional systems. is will substantially reduce the investments in new powerstations needed to operate purely during peak hours. e ASA Consulting report has estimated that with an extensive use of systems like Termodeck until 2020, the capital costs of powerstations in Saudi Arabia alone could be reduced by up to US$8 billion. e cumulative savings in CO2 emissions would be 18 million tonnes. Termodeck systems do have high requirements on the building envelope, which can create an additional cost. However, one benefit to the overall building costs is that no false ceilings are required, which reduces the overall building height and one extra floor can be gained for every five to seven floors. e system is not limited to the servicing of office spaces. In 2004 an installation was completed in the Lulu Hypermarket, in Muscat, Oman. Two floors are supplied by the system covering a total area of 20,000m2. After more than one complete year of operation, the client has confirmed that it has saved both in capital investments and day to day operations. Bjorn Ostbye, project development manager for the Emke Group said: "We have saved approximately $640 000 (AED2.35 million) on investments. e operational costs are around $150,000 (AED 560,000) lower on an annual basis due to 30% less electricity charges and reduced maintenance." Environmentally friendly buildings have always been considered uneconomical when compared with traditional solutions or offering unacceptable levels of compromise in occupant comfort or use. A report by Gardner & eobald in conjunction with Mott Macdonald in the UK shows that for the first time, truly cost- effective as well as environmentally efficient buildings can be designed and built. The report compared the Termodeck system with natural ventilation and comfort cooling, and demonstrated that the system was cheaper to build than a comfort cooled building and on a net present value model basis after 25 years, Termodeck was the cheapest of the three options. A school in Sheffield was used as a model for the research. is building was designed as a PFI project, and was therefore ideal for comparison of whole life cycle costs. is report reinforced the earlier New Practice Report 106 by the DETR which looked at the capital costs of the award winning Elizabeth Fry building which confirmed that it had similar cost to a naturally ventilated building but significantly cheaper than an airconditioned building. Termodeck has a proven track record and offers significant capital cost and operational savings for new buildings. Termodeck will carry out detailed thermal modelling of proposed new buildings and develop this information with the client's consultants and design team at the early stages of project conception. On completion of the project, Termodeck provide monitoring for a period of up to two years to ensure that the system achieves its full potential. Project Location Area Installed Cooling Load Savings Conventional VHCS VHCS vs Conventional (m2) (tonnes) (tonnes) (%) Lotus Centre Jeddah 4400 180 76 58% Gulf Centre Jeddah 30,700 2750 1250 55% Ibrahim Aba Al-Khail Villa Riyadh 1250 40 15 63% Abdulrahman Al-Ohaly Villa Riyadh 1225 60 24 60% Gulf Agency Company Dubai 1450 90 40 56% Lulu Hypermarket Muscat 20,000 1360 680 50% Table 1. Estimated savings that can be achieved using hollowcore concrete plank systems. SOURCE: ASA CONSULTING