To cool the lubricating oil, a concentric counter-flow heat exchanger is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of 0.18 kg/s. The intake and output oil temperatures are 95ºC and 65ºC, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchanger at a temperature of 30ºC. Stating all the necessary assumptions, (a) determine required length of the pipe. (b) Considering the effect of fouling during operation through time and the heat transfer resistance would be affected, discuss the design and operation considerations to minimize the fouling problem on the opertion of the heat exchanger during design and operation stages. Consider average value of Engine oil property: Cp=2131 J/kgoC; μ=0.0325 Ns/m2; K=0.138 W/moC Consider average value of water properties: Cp=4174 J/kgoC; μ=725x 10-6 Ns/m2; K=0.138 W/moC; Pr=4.85
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
To cool the lubricating oil, a concentric counter-flow heat exchanger is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of 0.18 kg/s. The intake and output oil temperatures are 95ºC and 65ºC, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchanger at a temperature of 30ºC.
Stating all the necessary assumptions,
- (a) determine required length of the pipe.
- (b) Considering the effect of fouling during operation through time and the heat transfer resistance would be affected, discuss the design and operation considerations to minimize the fouling problem on the opertion of the heat exchanger during design and operation stages.
Consider average value of Engine oil property: Cp=2131 J/kgoC; μ=0.0325 Ns/m2; K=0.138 W/moC
Consider average value of water properties: Cp=4174 J/kgoC; μ=725x 10-6 Ns/m2; K=0.138 W/moC; Pr=4.85
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