G A double-pipe heat exchanger will be used to cool a hot stream (in inner pipe, ID 2.067 in, OD= 2.375 in) from 350°F to 250°F by heating a cold stream (in annulus, ID 4.05 in) from 80°F to 120°F. If the heat-transfer coefficients are hi = 200 and ho=350 Btu/h. ft² °F, calculate the wall temperature of inner pipe. =
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- A heat exchanger is to be designed to condense 8 kg/sec of an organic liquid (tsat=80°C, hfg=600 KJ/kg) with cooling water available at 15°C and at a flow rate of 60 kg/sec. The overall heat transfer coefficient is 480 W/m2 -°C calculate: a) The number of tubes required. The tubes are to be of 25 mm outer diameter, 2 mm thickness and 4.85 m length b) The number of tube passes. The velocity of the cooling water is not to exceed 2 m/sec.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.G A double-pipe heat exchanger will be used to cool a hot stream (in inner pipe, ID 2.067 in, OD= 2.375 in) from 350°F to 250°F by heating a cold stream (in annulus, ID 4.05 in) from 80°F to 120°F. If the heat-transfer coefficients are hi = 200 and ho=350 Btu/h. ft² °F, calculate the wall temperature of inner pipe. =
- How would you formulate this problem to obtain a more meaningful result which desired to cool a gas has [Cp = 0.35 Btu/(Ib)(°F)] from 190 to 95°F, using cooling water at 83°F. Water costs $0.30/1100 f, and the annual fixed charges for the exchanger are $0.60/ft of inside surface, with a diameter of 0.0775 ft. The heat transfer coefficient is U = 8 Btu/(h)(f)(F) for a gas rate of 2900 Ib/hr. Plot the annual cost of cooling water and fixed charges for the exchanger as a function of the outlet water temperature. What is the minimum total cost?The condenser of a room air conditioner is designedto reject heat at a rate of 15,000 kJ/h from refrigerant-134aas the refrigerant is condensed at a temperature of 408C. Air(cp 5 1005 J/kg?K) flows across the finned condenser coils,entering at 258C and leaving at 358C. If the overall heat transfer coefficient based on the refrigerant side is 150 W/m2?K,determine the heat transfer area on the refrigerant side.P1
- A heat exchanger is heating water on the tube side with steam condensing on the shell side. The water is entering at 45 0 F and exiting at 175 0 F. No instruments are available for measuring the tube side water flow but condensed steam from the shell side is being collected at a rate of 43 GPM. If the tube area of the exchanger is 350 Ft2 , and the overall heat transfer coefficient clean was 900 BTU/Hr.Ft2 F0, how much has the overall heat transfer coefficient changed, if at all? Note: Latent heat for water/steam at 212 0 F is 970 BTU per pound of water. A gallon of water weighs 8.34 lbs.Water (cp = 4182 J/Kg.K) at a flow rate of 5000 Kg/hr is heated from 10oC to 35oC in an oil cooler by engine oil (cp = 2072 J/Kg.K) with an inlet temperatureof 85oC and a flow rate of 6000 Kg/hr. Take the overall heat transfer coefficient to be 3500 W/m2.K. What are the areas required for:a. Parallel Flow.b. Counter FlowWater flows at the rate of 65kg/min through a double pipe counter flow HX. Water is heated from 50deg C to 75deg C by an oil flowing through the tube. the specific heat of oil is 1.78kJ/kg-K. The oil enters at 115 degC and leaves at 70degC. The overall heat transfer coefficient is 400W/m2-K. Calculate the rate of heat transfer and the required number of tubes with OD=30mm and L=4m
- Need answer ASAP In a counter-current-flow tubular heat exchanger, a liquid food (milk),flowing in the inner pipe, is heated from 20 to 40°C. In theouter pipe the heating medium (water) cools from 90 to50°C. The overall heat-transfer coefficient based on the insidediameter is 2000 W/(m^2-°C). The inside diameter is 5 cm andlength of the heat exchanger is 10 m. The average specific heatof water is 4.181 kJ/(kg-°C). Calculate the mass flow rate ofwater in the outer pipe. Compare the amount of milk being heated to concurrent design.A double-pipe counter-flow heat exchanger isto cool eth ylene glycol (Cp = 2560 J/kg-°C) flowing at a rate of 3.5 kg/s from 80°C to 40°C by water (Cp = 4180 J/kg-°C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area ofthetubeis 250 W/m2°C. Determine theheat transfer surface area on the inner side ofthetube. m2consider a flow of water in a cylinder maintained at constant temperature of hundred degree Celsius the diameter of the cylinder is 15 and the length of the tube is 6 metre the inlet and outlet temperature of the water is TI equal to 15 degree Celsius and equal 57 degrees celsius find the average heat transfer Coefficient associated with the flow of water mass flow rate is 2.25 kilogram per second and cp=4.178KJ/aKg.K