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.
The efficiency of reciprocating gas engines of integrated energy systems (IES) for combined electricity, heat and refrigeration generation is strictly influenced by their cyclic air temperatures. To evaluate the effect of gas engine cyclic air deep cooling, compared with conventional its cooling, the data on dependence of fuel consumption and power output of gas engine JMS 420 GS-N.L on its inlet air temperature at varying ambient air temperatures at the entrance of the radiator for scavenge air cooling were received. The results of treatment of gas engine efficiency monitoring proved non-effective operation of conventional chilling all the ambient air, coming into the engine room, because of increased air temperature at the inlet of turbocharger (TC), caused by heat influx from surroundings in the engine room. A new method of gas engine inlet air two-stage cooling at increased ambient air temperatures and advanced cyclic air cooling system with absorption lithium-bromide chiller and refrigerant ejector chiller was proposed. With this chilled water from absorption lithiumbromide chiller is used as a coolant in the first high-temperature stage of engine inlet air cooler and boiling refrigerant of ejector chiller in the second lowtemperature stage.
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