Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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An air-cooled condenser has an h value of 30 W/m2-K based on the air-side area. The air-side heat transfer area is 190 m2 with air entering at 27°C and leaving at 40°C. If the condensing temperature is constant at 49°C, what is the air mass flow rate in kg/s? Let Cp(air) = 1.006 kJ/kg-K. Draw and label the temperature-flow diagram. Round off your answer to three (3) decimal places.
Crude oil, Cp = 1.9 kJ/(kg.K), flows at a rate of 0.32 kg/s through the inner pipe of a tube-in-tube
heat exchanger and it is heated from 29 °C to 96 °C. Another hydrocarbon, Cp = 2.50 kJ/(kg. K),
enters at 240 °C. The overall coefficient of heat transfer is found to be 4200 W/(m?K). Determine
for a minimum temperature difference of 20 °C between the hot and cold Nuids; a) the LMTD
for parallel flow and for counterflow heat exchamger; b) the surface area for both heat
exchanger configurations; c) mass Now rate of hot Nuid for both heat exchanger configurations.
Catalogue data of a water-cooled condenser of a manufacturer gives the following details:
Condensing temperature 48.9°C
Water inlet temperature 37.8°C
Water flow rate 20.694 kg/s
Capacity 145 tons
Estimate the capacity of this condenser with the same water flow rate but with an inlet temperature of 30°C and a condensation temperature of 42°C. The evaporation temperature may be assumed to be constant at 2.2°C.
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- Mechanical engineering : Heat transfer 1. Determine the overall heat transfer coefficient and flow rate required while using a heat exchanger , the water is enetered at 20◦C through the tubes of small single pass and the water comes out with a temperature at 40◦C. 25 kg/min of steam condenses at 60◦C on the shel side ,the area of the exchanger is 12 m2. (The latentheat, hfg, is 2358.7 kJ/kg at 60◦C.) 2 . You have unpainted aluminum siding on your house and the engineerhas based a heat loss calculation on U = 5 W/m2K. You discover thatair pollution levels are such that Rf is 0.0005 m2K/W on the siding.Should the engineer redesign the siding? If not sure skip, wrong may downvotearrow_forward3. In a shell-and-tube heat exchanger, water enters at 85°C at the rate of 5.4 kg/s. Engine oil enters at 20°C and leaves at 60°C. The water leaves the heat exchanger at 57°C. What is the mass flow rate of the engine oil? Express your answer in kg/s.arrow_forwardForced air flows over a convective heat exchanger in a room heater resulting in an average convective heat transfer coefficient, h=# # # W/ (m? degree C). The surface temperature of the heat exchanger may be considered constant at 75 degree C, the air being at 25 degree C. Determine the heat exchanger surface area required for MJ/h of heating, 2arrow_forward
- 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.arrow_forward3. A 6 in x 20 ft uninsulated B.I pipe conveys steam at 385 °F with an average ambient temperature of 85°F. if the cost of the fuel is PhP 250.00 per 106 BTU with the net energy conversion efficiency of 75%, what is the annual cost of the heat lost? For 6 in. pipe schedule 80:Do = 6.625 inDi = 5.761 in For iron:k = 30 BTU/ hr ft °F for the surface coefficients:hi = 1000BTU/ hr ft2°F ho = 2 BTU/hr ft2 °Farrow_forwardA thin-walled, double-tube, counterflow heat exchanger is used to cool oil (Cp = 2.20 kJ/kg °C) from 150 to 40°C at a rate of 2 kg/s by means of water (Cp = 4.18 kJ/ kg °C), which enters at 22°C at a rate of 1.5 kg/s. Determine the rate of heat transfer in the exchanger and the leaving temperature of the water.arrow_forward
- What are the common approximations made in the analysis of heat exchangers?arrow_forward10. In a double-pipe counterflow heat exchanger, water at the rate of 60 kg/min is heated from 65 oC to 95 oC by an oil having a specific heat of 0.36 J/kg oC. The oil enters the exchanger at 200 oC and leaves at 140 oC. Determine the heat exchanger area for an overall heat transfer coefficient of 50 J/m2. oC.hr given Cp of water as 1 J/kg oC?arrow_forwardIn an heat exchanger of parallel flow type, water enters at 60°C and leaves at 80°C while oil of specific gravity 0.8 enters at 250°C and leaves at 100°C. The specific heat of oil is 2.5 kJ/kg K and surrounding temperature is 300 K. Determine the loss in availability on the basis of one kg of oil flow per second.arrow_forward
- 4.) A pump in a municipality's water-supply system receives water from the filtration beds and pumps it up to the top of a water tower. The tower's height is 35 m, and the inlet piping to the pump is 2 m below the pump's intake. The water temperature is 20°C, measured at both the inlet and discharge from the pump. The mass flow rate through the pump is 100 kg/s, the diameter of the inlet piping is 25 cm, and the diameter of the discharge piping is 15 cm. Assuming that there is no heat transfer and no change in internal energy of the water, determine the power required by the pumparrow_forwardMilk is flowing through a heat exchanger at a rate of 2000 kg/h. The heat exchanger supplies 111,600 kJ/h. The outlet temperature of the product is 95°C. Determine the inlet temperature of the milk. The product specific heat 3.9 kJ/kg°C. Answer must be 80.69°Carrow_forward2- In a heat exchanger, steam of 0.08 bar and a specific steam content of 95% is condensed. 381.6 tons / h cooling water with a temperature of 10 ̊C flows in parallel connected tubers with inner / outer diameter 28/30 mm with a speed of 0.65 m / s. The heat transfer surface of the heat exchanger is 220 m2 and it has a k-value of 2200 W / (m2K) . Assume the specific heat capacity of the water 4.18 kJ / (kg K) and density 1000 kg / m3. The K-value is attributed to the outer mantle surface of the tubes. a) Calculate the outlet temperature of cooling water. b) How many tonnes of steam per hour are condensed? c) Determine the number of tubes and tube lengtharrow_forward
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