The effect of exhaust-to-coolant heat transfer on warm-up time and fuel consumption of two automobile engines
A 1977 Buick V-6 engine and a 1981 Ford Granada automobile were equipped with heat exchangers to transfer energy from the exhaust gases to the cooling water after cold starts in order to shorten engine warm-up periods and improve fuel economy. A parallel concern was the time required to reach satisfactory heat delivery to the passenger compartment. The Buick engine was investigated in the laboratory. The Ford automobile was tested during driving over a 12.4 km length of freeway and over an 8.6 km test route including both in-town and highway segments. Prior to each test run the engines were exposed to ambient air for at least 8 hours at temperatures ranging from -26/sup 0/C to +2/sup 0/C. The use of the heat exchangers resulted in average reductions of fuel consumption of 2.8% during a 7 minute warm-up period for the engine, and of 2.2% for the automobile when tested on the above test routes. The corresponding times for the coolant in the automobile compartment heater to reach maximum temperature were reduced by 16% and 7%. While fuel savings were achieved, their economic value is questionable, particularly in light of a possible retrofit of an existing automobile with an exhaust-to-coolant heat exchanger and the necessary control equipment.
- OSTI ID:
- 5575700
- Report Number(s):
- CONF-860263-
- Resource Relation:
- Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 24 Feb 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUTOMOBILES
COOLANTS
EXHAUST GASES
PERFORMANCE TESTING
ROAD TESTS
SPARK IGNITION ENGINES
HEAT RECOVERY
FUEL CONSUMPTION
WASTE HEAT UTILIZATION
COMPARATIVE EVALUATIONS
CONTROL EQUIPMENT
COST BENEFIT ANALYSIS
FUEL ECONOMY
HEAT EXCHANGERS
HEAT TRANSFER
HEATING
LEADING ABSTRACT
LOW TEMPERATURE
MEDIUM TEMPERATURE
MEETINGS
RETROFITTING
START-UP
TEMPERATURE EFFECTS
THERMAL COMFORT
TIME RESOLUTION
ABSTRACTS
DOCUMENT TYPES
ENERGY CONSUMPTION
ENERGY RECOVERY
ENERGY TRANSFER
ENGINES
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
RECOVERY
RESOLUTION
TESTING
TIMING PROPERTIES
VEHICLES
WASTE PRODUCT UTILIZATION
WASTES
330101* - Internal Combustion Engines- Spark-Ignition