Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m2 hr degree, what heat exchanger area is required to handle the load for counter flow arrangement?

Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat ex

1.	Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m2 hr degree, what heat exchanger area is required to handle the load for counter flow arrangement?
A.	2.758 m2
B.	3.758 m2
C.	4.758 m2
D.	5.758 m2
Answer» C. 4.758 m2

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Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m2 hr degree, what heat exchanger area is required to handle the load for counter flow arrangement?
A steam condenser is transferring 250 k W of thermal energy at a condensing temperature of 65 degree Celsius. The cooling water enters the condenser at 20 degree Celsius with a flow rate of 7500 kg/hr. If overall heat transfer coefficient for the condenser surface is 1250 W/m2 K, what surface area is required to handle this load?
Consider the above problem, find what error would be introduced if the arithmetic mean temperature difference is used rather than the log-mean temperature difference? Take overall heat transfer coefficient for the condenser surface as 1250 W/m2 K
Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m2 hr degree, what heat exchanger area is required to handle the load for parallel flow arrangement?
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Assumptions made for calculation of logarithmic mean temperature difference are(i) Constant overall heat transfer coefficient(ii) The kinetic and potential energy changes are negligible(iii) There is no conduction of heat along the tubes of heat exchangerIdentify the correct statements
EXHAUST_GASES_(C_P_=_1.12_K_J/KG_K)_FLOWING_THROUGH_A_TUBULAR_HEAT_EXCHANGER_AT_THE_RATE_OF_1200_KG/HR_ARE_COOLED_FROM_400_DEGREE_CELSIUS_TO_120_DEGREE_CELSIUS._THIS_COOLING_IS_AFFECTED_BY_WATER_(C_P_=_4.18_K_J/KG_K)_THAT_ENTERS_THE_SYSTEM_AT_10_DEGREE_CELSIUS_AT_THE_RATE_OF_1500_KG/HR._IF_THE_OVERALL_HEAT_TRANSFER_COEFFICIENT_IS_500_K_J/M2_HR_DEGREE,_WHAT_HEAT_EXCHANGER_AREA_IS_REQUIRED_TO_HANDLE_THE_LOAD_FOR_COUNTER_FLOW_ARRANGEMENT??$
A steam condenser is transferring 250 k W of thermal energy at a condensing temperature of 65 degree Celsius. The cooling water enters the condenser at 20 degree Celsius with a flow rate of 7500 kg/hr. If overall heat transfer coefficient for the condenser surface is 1250 W/m2 K, what surface area is required to handle this load?
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