The fuel efficiency of gas engines is effected by the temperature of intake
air at the suction of turbocharger. The data on dependence of fuel
consumption and engine electric power on the intake air temperature were
monitored for Jenbacher gas engine JMS 420 GS-N.LC to evaluate its
influence. A waste heat of engine is rejected for heating water to the
temperature of about 90??. The heat received is used in absorption
lithium-bromide chiller to produce a cold in the form of chilled water. A
cooling capacity of absorption chiller firstly is spent for technological
needs and then for feeding the central air conditioner for cooling the
ambient air incoming the engine room, from where the air is sucked by the
engine turbocharger. The monitoring data revealed the reserves to enhance
the efficiency of traditional cooling system of intake air by absorption
chiller through deeper cooling. This concept can be realized in two ways: by
addition cooling a chilled water from absorption chiller to about 5-7?? for
feeding engine intake air cooler or by two-stage cooling with precooling
ambient air by chilled water from ACh in the first stage and subsequent deep
cooling air to the temperatures 7-10?? in the second stage of intake air
cooler by using a refrigerant as a coolant. In both cases the ejector
chiller could be applied as the most simple in design.
One of the promising trends to increase the fuel and energy efficiency of gas turbines is contact cooling of cyclic air by using a twophase jet apparatus – an aerothermopressor. The rational parameters of work processes of the aerothermopressor were studied. The experimental setup was designed to simulate the aerothermopressor operation in the cooling air cycle of the gas turbine and to determine pressure losses in the aerothermopressor flow part. Based on the obtained experimental data, an empirical equation was proposed to determine the hydraulic resistance coefficient of the aerothermopressor flow part, depending on the initial pressure and the amount of water injected. The deviation of the calculated hydraulic resistance coefficient from the experimental ones is ± 25 %. The obtained results can be used in the practice of designing the aerothermopressor for gas turbine cyclic air cooling.
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