G.M. Tashtoush and Y.S.H. Najjar (Jordan)
heating system, engine driven system-heat pump
As fuel prices keep changing and energy reserves keep decreasing, efficient methods of energy conversion and utilization should be used. Heat pumping is a good example where low grade diluted thermal energy is abstracted from outdoor air and concentrated by the pump in order to raise the temperature of indoor air. If overall energy utilization at the national level has the priority, driving a heat pump by an electric motor is not the best method, due to the inefficient conversion of fossil fuel into electricity at the power station. Therefore, engine-driven heat pumps have been preferred using gas engines, diesel engines or gas turbines. The output of the heat pump is expected to be about 65% higher than electrically driven systems, based on the same amount of fuel used. The advantages of these systems are mainly due to local generation of shaft power and providing engine heat that can be usefully employed , by recovering part of the waste energy of the gases and engine coolant. Such systems can operate continuously in comparison with solar systems. In this work, three research investigations, carried out by the author and associates are briefly reviewed. They cover engine-assisted heating and cooling systems both vapor compression and absorption, associated with gas turbine and internal combustion engines. Primary energy was found to be saved by about 50% when using engine-driven heat pumps. The superiority of the gas turbine system was quite clear.
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