PGSRET 2018

Abstract

For any nation, primary sources of energy consumption are involved in: heating, cooling, humidification, dehumidification, ventilation and/or air-conditioning (HVAC), which may be required for various applications. Currently, Pakistan is facing extreme energy shortage, therefore, low-cost and energy-efficient HVAC systems are principally required. As the Pakistan is an agriculture dependent country, therefore, low-cost HVAC systems are required not only for humans' thermal comfort but also for various agriculture based applications e.g. greenhouse air-conditioning, agricultural products' (fruits and vegetables) storage, and animals' (livestock) air-conditioning etc. In this regard, various innovative cooling and air-conditioning technologies have been introduced worldwide. Consequently, in this keynote speech, evaporative cooling and adsorption cooling based HVAC technologies are explored. These technologies are environmentally safe and can be simply operated by water or low-grade waste heat. The low-grade waste heat can be supplied economically by many ways e.g. solar thermal energy, natural coal, bio-gas and/or bio-mass etc. From the prospective of evaporative cooling, the speech focuses on Maisotsenko cycle (M-cycle) based evaporative cooling conception in comparison with conventional direct and indirect evaporative cooling. While adsorption cooling and desiccant air-conditioning systems are focused from the prospective of thermally driven systems. Importance of selection of refrigerant and adsorbent/desiccant is also highlighted. Based on geographic and climatic conditions of Pakistan, role of temporal and spatial variation for the development of sustainable HVAC system is addressed.

CV : Download