Heat is to be transferred from an unknown fluid to air through an aluminum wall. It is proposed that rectangular fins 1.2 mm thick and 6.35 mm long be added to the surface to increase the heat transfer. The fins will be spaced 2.0 mm apart. The wall is 3 mm thick and the air-side […]
A double-pipe heat exchanger with the dimensions shown in Fig. P2-9 is used to heat water (Tin = 50°F). Steam at 250’F is condensing on the outside with an ho = 2,500 Btu/ft2-hr-‘F. Sufficient steam is available. If the water flow rate is 3 ft/s, find the outlet temperature of the water. Neglect the thermal
(0) A l-in.-OD steel tube has its outside wall surface maintained at 250°F. Itis proposed that the rate of heat transfer be increased by adding fins b. in. thick and iin. long to the outside tube surface. Compare the increase in heat transfer achieved by adding 12 longitudinal .straight fins against that achieved by adding
Heat is to be transferred from water to air through an aluminum wall. It is proposed that rectangular fins 0.05 in. thick and I in. long and spaced 0.08 in. apart be added to the aluminum surface to aid in transferring heat. The heat transfer coefficients on the air and water sides are 3 Btu/hr-ft2-~F
Attributes of the inlet streams to a heat exchanger are as follows: The product in Btu/hr- OF for the heat exchanger is given by where eh and e are the capacities in Btu/lir-E Using only s-NTU method, (a) Find the outlet temperatures and rating for a parallel-flow arrangement. (b) Find the outlet temperatures and rating for a
Counter flow arrangement Read More »
A 0.25-in.thick steel wall contains 0.125-in. diameter by OJ-in. long copper spines located on 0.37S-in. center-to-center spacing. The spine fins are placed in a square array. The heat transfer coefficient on the side of the wall without fins is 1,000 Btu/hr-ft2-°F. Devise a computer solution to calculate the value of UA for a 1_ft2section of
Heat transfer coefficient Read More »
1. Explain why fouling degrades U A. 2. Sketch a TEMA size 20-90 type BOD exchanger. 3. Is a surface with a = 125 ft2 /ft3 compact?
Is surface FTD-2 [Fig. 3-20b] compact? Why are fins used in compact cross-flow heat exchangers? A shell-and-tube heat exchanger is designed for a given (specified) pressure drop along each tube. What happens to (1) the number of tubes required, (2) the friction factor, and (3) the heat transfer coefficient as the tube length is increased?
Cross-flow heat exchangers Read More »
1. For what type of use are TEMA class C heat exchangers specified? 2. Sketch and label the important dimensions for a TEMA size 26-163 type AFN exchanger. 3. What does the word “CODE” mean in the TEMA standards?
1. If the tube inside diameter is 0.300 in., find a for the tube-side flow for surface 8.0-iT. 2. A surface 8.0-i T is used as a heat-exchanger core. A cubic section of 1 ft3 is used. If hair = 10 Btu/hr-ftl-oF and hw = 400 Btu/hr-ft2-oF,evaluate U A. The fin material is aluminum; tube
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