(1) A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C? C) If the heat exchanger is changed to parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?

Can you please give me an analysis of heat tranfers in heat exchangers?

Concentric Tube Heat Exchanger For equivalent inlet conditions, why should a counterflow heat exchanger have better effectiveness than a parallel unit?

QUESTION 9 As in the previous question, a concentric-tube, counter-flow heat exchanger, as shown below, is used to cool mercury [C, h = 1,370 J/kg - "C] flowing at a rate of 1.0 kg/s from 110°C to 70°C. 10 The cooling fluid is water entering the heat exchanger at a temperature of 30°C and flow rate of 0.2 kg/s. The overall heat transfer coefficient of the exchanger is U = 250 w/m² - °C. Water Mercury Calculate the required heat transfer area. O 7.75 m2 O 11.75 m2 O 4.75 m2 O None of these answers O 8.75 m2 Click Save and Submit to save and submit. Click Sare All Answers to save all answers. Save All Answers 人 100% G