WASTE HEAT RECOVERY IN HEAT PUMP SYSTEMS: SOLUTION TO REDUCE GLOBAL WARMING

Energy conversion technologies, where waste heat recovery systems are included, have received significant attention in recent years due to reasons that include depletion of fossil fuel, increasing oil prices, changes in climatic conditions, and global warming. For low temperature applications, there are many sources of thermal waste heat, and several recovery systems and potential useful applications have been proposed by researchers (1-4). In addition, many types of equipment are used to recover waste thermal energy from different systems at low, medium, and high temperature applications, such as heat exchangers, waste heat recovery boiler, thermo-electric generators, and recuperators. In this paper, the focus is on waste heat recovery from air conditioners, and an efficient application of these energy resources. Integration of solar energy with heat pump technologies and major factors that affect the feasibility of heat recovery systems have been studied and reviewed as well. ABSTRAK: Teknologi penukaran tenaga, di mana sistem pemulihan haba buangan diambil kira, mula mendapat perhatian kebelakangan ini disebabkan oleh beberapa faktor. Contohnya kurangnya tenaga fosil, peningkatan harga minyak, perubahan cuaca dan pemanasan global. Pada aplikasi suhu rendah, terdapat banyak sumber haba buangan dan beberapa sistem pemulihan dan aplikasi berguna yang sesuai dicadangkan oleh pelbagai pengkaji dari seluruh dunia (1-4). Tambahan pula, berbagai alatan digunakan untuk memulihkan tenaga haba buangan daripada sistem yang berbeza kepada aplikasi suhu rendah, sederhana dan tinggi. Alatan tersebut meliputi penukar haba, dandang pemulihan tenaga haba buangan, penjana elektrik-terma dan pemulih. Kertas kerja ini memfokuskan kepada pemulihan tenaga haba buangan daripada penghawa dingin dan aplikasi yang efisien bagi sumber tenaga ini. Turut dikaji juga, gabungan tenaga suria bersama teknologi pam haba dan faktor utama yang mempengaruhi kebolehlaksanaan sistem pemulihan tenaga haba.