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عدد المساهمات : 18928 التقييم : 35294 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
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أخواني في الله أحضرت لكم بحث بعنوان A Review of Ground Heat Exchangers for Cooling Application in the Malaysian Climate T.M. Yusof1 , S. Anuar and H. Ibrahim 1Faculty of Mechanical Engineering, University Malaysia Pahang 26600 Pekan, Pahang, Malaysia Phone: +609-424-6257; Fax: +609-424-6200 Email: amyusof@ump.edu.my, bshahrani@ump.edu.my, cdrhassan@ump.edu.my 2Automotive Engineering Centre, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
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ABSTRACT The ground heat exchanger (GHE) is one of the energy sources that has been identified since the 1970s which is able to produce sustainable energy for cooling which is in passive side. GHEs are widely implemented around the world, especially in European countries and a few Asian countries. In Malaysia, application of GHE is still considered as a new passive cooling approach in building energy reduction. Therefore, this paper reviews several important ways of implementing GHE in order to supply passive cooling for any application. The review covers general implementation of the GHE for thermal comfort and agricultural greenhouse cooling. The ground temperature variation used in different researches is also reviewed in this paper as an important part of identifying potential GHE implementations. Design and performance aspects of the GHE are also reviewed. Finally, this paper summarizes the potential and benefit of GHE implementation in the Malaysian climate for cooling applications to reduce the energy used in buildings and greenhouse gas emission. CONCLUSIONS The GHE is one of the methods that can be used for reducing energy consumed in buildings and agricultural greenhouses. Both heating and cooling requirement can be supply by the GHE. Application of GHE for cooling purpose has been identified that it can give a better performance. Thermal performance of the GHE depends on several main factors such as ground temperature variation, design and specification of the GHE pipe. Each of the main factor is future depends on several sub-factors. Geographical sub-factor which related to the average ambient temperature gives a huge effect to the ground temperature variation. The magnitude of constant temperature variation occurred with the same as the local average ambient temperature. The local average ambient temperature in this study obtained as 26.9°C, therefore the GHE is able to produce significant passive cooling for the Malaysian climate since the daytime temperature can reach up to 34ºC. However, the implementation of GHE in Malaysia requires detail ground temperature study at different depth. The ground temperature study in Malaysia should be conducted at different location nationwide using mathematical model and measurement methods. Combination of GHE’s system design and pipe specification for optimum performance also become a great focus for future study of GHE implementation in Malaysia in achieving energy saving and greenhouse gas emission produce by fossil fuel.
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