Tony Stark, a brilliant inventor, has designed a special suit/armor that has an inbuilt small but concentrated high-powered reactor as its power source. The only problem is there is lot of heat generated in the reactor that needs to be cooled for the suit to be actually wearable. Stark needs a heat exchanger mounted on the suit to dissipate the excess heat generated in the reactor. He found a 10 cm x 20-cmx5-cm space on the armor for the heat exchanger. He chose a liquid (specific heat 2.8 kJ/kg°C) that circulates around the reactor and takes heat away from the reactor and then enters the heat exchanger with mass flow rate of 0.2 kg/s at a temperature of 180°C. It comes out of the heat exchanger at a temperature of 10°C. The other fluid in the heat exchanger is a phase-changing liquid that remains at -23°C as it changes phase from saturated liquid to a mixture of liquid and vapor during the heat exchange process. The latent heat vaporization for the phase-changing liquid is 560 kJ/kg. Stark designed the flow in the heat exchanger in a way that gives an overall heat transfer coefficient of 1666 W/m2.°C. (a) How much heat transfer area has he designed inside the heat exchanger? (b) Can this be classified as a compact heat exchanger?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Tony Stark, a brilliant inventor, has designed a special suit/armor that has an inbuilt small but concentrated high-powered reactor as its power source. The only problem is there is lot of heat generated in the reactor that needs to be cooled for the suit to be actually wearable. Stark needs a heat exchanger mounted on the suit to dissipate the excess heat generated in the reactor. He found a 10 cm x 20-cmx5-cm space on the armor for the heat exchanger. He chose a liquid (specific heat 2.8 kJ/kg°C) that circulates around the reactor and takes heat away from the reactor and then enters the heat exchanger with mass flow rate of 0.2 kg/s at a temperature of 180°C. It comes out of the heat exchanger at a temperature of 10°C. The other fluid in the heat exchanger is a phase-changing liquid that remains at -23°C as it changes phase from saturated liquid to a mixture of liquid and vapor during the heat exchange process. The latent heat vaporization for the phase-changing liquid is 560 kJ/kg. Stark designed the flow in the heat exchanger in a way that gives an overall heat transfer coefficient of 1666 W/m2.°C. (a) How much heat transfer area has he designed inside the heat exchanger? (b) Can this be classified as a compact heat exchanger?

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