Authors: D H Lim S C Kim M S Kim
Publish Date: 2013/07/28
Volume: 14, Issue: 4, Pages: 579-585
Abstract
An electric water pump for engine cooling system has an advantage which particularly in the cold start the use of the electric water pump saves fuel and leads to a corresponding reduction in emissions However the electric water pump for internal combustion engine generates much more heat loss than that for hybrid electric vehicle or electric vehicle since it is operated by electric power of high current and low voltage In this study the fluid flow and thermal characteristics of the canned type electric water pump with an inverter integrated has been investigated under the effects of heat generation The analysis conditions such as outdoor air temperature of 125°C water pump speed of 6000 rpm coolant temperature of 106°C and coolant flow rate of 120 L/min were used as a standard condition Therefore the thermal performance of the canned type electric water pump’s motor and inverter was evaluated by comparison with that of mechanical seal type In the motor the temperature reduced by over 10°C and in the inverter the amount of temperature decrease equaled to the maximum temperature difference about 187°C Also canned type electric water pumps of variable materials were compared for the evaluation of thermal transfer performance for variable thermal conductivity of a can The motor and inverter were cooled lower to 42°C at motor and about 40°C at inverter for reasonable selection of can’s thermal conductivity
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