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Energy And Exergy Analysis of a Hospital Trigeneration System



Developing countries like Turkey have a growing need for energy in a wide variety of areas. In addition, existing energy sources must be used in the most efficient way. Since trigeneration systems are both electricity generating and heating and cooling effects producing systems, they clearly reduce operating costs with less fuel consumption than systems that produce them separately. Besides, in these systems, greenhouse effect can be avoided by using environmentally friendly refrigerants or refrigerant pairs. Trigeneration systems can be thought of as a system that basically includes chiller units that have been added to a cogeneration system and operate with waste heat energy. Trigeneration systems are the most effective solutions to reduce the electricity consumption in summer, especially due to the cooling requirement, as well as being a system that clearly reduces operating costs. Given all these features, the trigeneration systems offer a unique solution for medium and large-scale businesses such as hospitals, university campuses, hotels, shopping malls for electricity generation, heating and cooling effects.

The trigeneration system discussed in this study is an actual natural gas internal combustion engine powered trigeneration system in a research hospital campus. This system is designed to have 2000 kWh electricity, 2155 kWh heating and 1350 kWh cooling load capacities. First, the process flow diagram of this system will be presented to explain the basic operating principles and then a detailed energy and exergy analysis of all the sub-units of the system will be presented. In thermodynamic analysis, the actual operating data of the system will be used. Thus, the reasons of the exergy destructions occurred in the sub-units will be discussed; specific improvement methods and solution proposals will be presented.



Mehmet Burak ÖZGÖZTAŞI – He received his BSc degree in Mechanical Engineering from Uludağ University, Bursa in 2012. He has completed MSc graduate courses at Mechanical Engineering Department of Gaziantep University and continues to study on his thesis. The author currently continues to work as a project and field engineer at Dr. Lütfi Kırdar Research and Application Hospital in Istanbul.