Group 1 4 Ch Ea

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Information about Group 1 4 Ch Ea

Published on February 8, 2009

Author: 4ChEAB08

Source: slideshare.net

Group 1 4 CheA Tan, Maria Kimberly L. Costales, Rose Ann Katigbak, Donald Averilla, Gerard Lagmay, Marvin

1. For a counterflow heat exchanger, operating at moderate temperature, with no phase change. The hot rod is twice that at the cold end. Estimate the effective exchanger length (measured from the cold end) and half the heat loss. q= U A ∆Tlm ½ q= U π DL ∆Tlm (1/2 q)/ (U π D∆Tlm)= L

1. For a counterflow heat exchanger, operating at moderate temperature, with no phase change. The hot rod is twice that at the cold end. Estimate the effective exchanger length (measured from the cold end) and half the heat loss.

9. It is proposed to condense 7 kg/sec of saturated Freon 12 vapor in a refrigeration system by allowing it to flow on the outside surface of a vertical 1” O.D. (18 BWG) copper tubes. Cooling water enters the tubes at 24oC and leaves the system at 38oC and leaves the system with a velocity of 3 m/s. Calculate: a) the number of tubes in parallel needed in the system b) the Length of each tube

9. It is proposed to condense 7 kg/sec of saturated Freon 12 vapor in a refrigeration system by allowing it to flow on the outside surface of a vertical 1” O.D. (18 BWG) copper tubes. Cooling water enters the tubes at 24oC and leaves the system at 38oC and leaves the system with a velocity of 3 m/s. Calculate: a) the number of tubes in parallel needed in the system b) the Length of each tube

1” OD 18 BWG copper tubes: Do= 1” Di= 0.902 in. K=250 W/mk T= -28.3 C temperature Heat of condensation -25 13.33 T 10.37 -30 8.86

 

 

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