A novel design for a condenser consists of a tube of thermal conductivity
Determine the heat removal rate per unit tube length ina section of the tube for which the water is at
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Chapter 11 Solutions
Fundamentals of Heat and Mass Transfer
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- Question B3. A concentric tube heat exchanger is used to cool lubricating oil for a large diesel engine. The inner tube is constructed of 2 mm wall thickness stainless steel, having thermal conductivity 16 W/m K. The flow rate of cooling water through the inner tube (radius = 30 mm) is 0.3 kg/s. The flow rate of oil through the tube (radius = 50 mm) is 0.15 kg/s. Assume fully developed flow, if the oil cooler is to be used to cool oil from 90°C to 50°C using water available at 283K. The overall heat transfer coefficient is 21.9 W/(m2K). Calculate the length of the tube required for parallel (co-current) flow, and the length of the tube required for counter-current flow. The average heat capacity for oil is 2.131 kJ/(kgK) and for the water 4.178 kJ/(kgK).arrow_forwardFor an exhaust valve, the mass flow rate through the valve is 1.26 kg/s. The flow coefficient is 0.65 and the cylinder pressure and temperature are 625 kPa and 820 K. Assume exhaust system pressure is 103 kPa, the specific heat ratio is 1.4 and R =287J/ kg.K. The effective area of the valve is (SI unit): Select one: O a. 3.45*10-2 O b. 0.85*10-2 O c. 2.2*10-3 O d. 1.85*10-3 O e. 1.42*10-3arrow_forwardSolve it correctlyarrow_forward
- A Two-pass steam Condenser is designed for a full heat load of (293 MW) at a pressure of (0.05 bar). The inlet and outlet temperature of circulating water is (15 °C) and (25 °C) respectively. A (2.5 cm) Diameter, (304 Stainless Steel) Condenser tube has been selected. The water velocity inside the tubes is assumed to be (2.6 m/s). Assume the following: U₁ = 2053 W/m².C ; C₁= 4.187 kJ/kg.K ; p = 1000 kg/m³. Estimate the following: 1. The effective tube length; 2. Cooling water flow rate; 3. Total heat transfer area ; 4. Condenser Effectiveness. Water 3 2 ot Wet Steam C.Wout C.Win Qcarrow_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℃. Determine the inlet temperature of the milk. The product specific heat is 3.9kJ/(kg℃). Show PBD and complete solution.arrow_forwardA manufacturer conducted an experiment for an evaporator capacity 507 kW cooling and designed for high COP of 1.8 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 694 kW, determine: Heat provided by the generator & absorber capacity in kWarrow_forward
- The clean U for an exchanger is 770 BTU/(hr 0 F ft2). Its tube area is 550 ft2. After operating for several months, it is heating water from 40 0F to 150 0F at a flow rate of 200 GPM with a heating fluid on the shell entering at 300 0F and exiting at 170 0 F. Has the overall U decreased significantly? how many 1.0 inch diameter, 20 ft long tubes would it take to equal the 550 ft2 area?arrow_forwardAn 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.arrow_forwardA freon 12 waste water system operating at 5 °C suction temperature and a 40°C condensing temperature has an evaporator load 17.6 KW. If the condenser is selected for a 70°C water temperature rises, how many gpm must be circulated through the condenser? The following enthalpies have been found; condenser entrance =377 kJ/kg; exitA=238.5 kJ/kg; evaporator entrance =238.5 kJ/kg; exit = 253.6 kJ/kg.arrow_forward
- A pump draws saturated water from a condenser which is maintained at 32.15°C. The friction head losses between pump and condenser is measured to be 1.5 m. Determine the minimum height of water level (above pump centerline) in the condenser if NPSH required required for the pump is 3.5m Draw the FIGUREarrow_forwardThe food storage room requires a cooling system with a capacity of 10 tons of refrigeration which operates at an evacuation temperature of -17. 8 degrees Celsius and the condenser temperature is 28.0 ° C. The refrigerant used is R-717 and the system operates at saturated conditions. Determine: Cop, refrigerant flow rate and heat loss rate in the condenser.arrow_forwardWater must be heated from 15 to 50°C in a simple double-pipe heat exchanger at a rate of 3,500 kg/h. The water is flowing inside the inner tube with steam condensing at 110°C on the outside. The tube wall is so thin that the wall resistance may be neglected. Assume that the steam-film coefficient h_0 is 11 kW/m^2 °C. What is the length of the shortest heat exchanger that will heat the water to the desired temperature, considering an optimal diameter for the tube? Checking several table values, the following properties of water for this scenario are: p = 993 kg/m^3 k = 0.61 W/m °C \mu (viscosity) = 0.78 cP Cp = 4.19 J/g °Carrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning