Baffles are provided in heat exchangers to increase the

In a heat exchanger, a fluid with a density of 2.5 m per hour and a specific heat of 0.727 kcal / kg ° C cools from 120 ° C to 40 ° C and heats 10 m per hour with an inlet temperature of 10 ° C. Since the total heat transfer coefficient is 1000 kcal / m h ° C, (Psu-1000 kg / m²; Cpsu = 1 kcal / kg ° C) a) Parallel flow case, b) Counter flow case, calculate the surface area of ​​the pipe.

With sketches, distinguish between parallel and counterflow heat exchangers. Why is the counterflow heat exchanger configuration preferred over the parallel type?

The heat exchanger use to heat the oil from 15 to 85℃. Blowing across the outside of the tubes is steam which enters at 130℃ and leaves at 110℃ with a mass flow rate 5.2kg/s. The over-all heat transfer coefficient is 275w/?2℃. C for steam 1.86kJ/kg℃ . Calculate surface area of heat exchanger. ANSWER:  10.5 m2

A counterflow heat exchanger is employed to cool 0.55 kg/s (CP = 2.45 kJ/kg-K) of oil from 115°C to 40°C by the use of water. The inlet and outlet temperatures of cooling water are 15°C and 75°C, respectively. The overall heat transfer coefficient is expected to be 1450 W/m2-°C. Using the NTU method, calculate the following:a. The mass flow rate of water.b. The effectiveness of the heat exchanger c.Surface area required

Oil is being cooled from 180°F to 120°F in a 1-shell and 2-tube heat exchanger with an overall heat transfer coefficient of 40 Btu/h·ft2·°F. Water (cpc = 1.0 Btu/lbm·°F) enters at 80°F and exits at 100°F with a mass flow rate of 20,000 lbm/h, determine (a) the NTU value and (b) the surface area of the heat exchanger.

An 8-tube shell-and-tube heat exchanger with 2 shell passes, ethyl alcohol (cp=2670) is used with a flow rate of 2.1 kg/s in tubes with a diameter of 5.9 cm. J/kg.°C) is used for heating from 25 °C to 70 °C. Heating, with water entering the body at 95 °C and leaving at 60 °C (cp=4190 J/kg.°C). is done. If the total heat transfer coefficient is 800 W/m2 .°C in case of; a) By logarithmic mean temperature difference (LMTD) method (correction factor, F=1 can be taken), b) Calculate the total length of the heat exchanger using the Ɛ-NTU method.

In a heat exchanger, the fluid at2.5 m3/h flow cools from120∘C to 40∘Cand inlet temperature 10∘C 10 m3/h flow of water is heating.Compare the exchanger surfaces area for reverse and parallel flow. (fluid density1100 kg/m3 ve specific heat Cp​=3044j/kgK, water density1000 kg/m3 specific heat Cp​=4187 J/kgK. heat transfer coefficient U=1163 W/m2 K)

Oil in an engine is being cooled by air in a cross-flowheat exchanger, where both fluids are unmixed. Oil (cph 52047 J/kg?K) flowing with a flow rate of 0.026 kg/s enters theheat exchanger at 758C, while air (cpc 5 1007 J/kg?K) entersat 308C with a flow rate of 0.21 kg/s. The overall heat transfercoefficient of the heat exchanger is 53 W/m2?K and the totalsurface area is 1 m2. Determine (a) the heat transfer effectiveness and (b) the outlet temperature of the oil.

Explain the procedure of design and analysis of a heat exchanger using concept of LMTD and the overall heat transfer coefficient.