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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- The food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -17.8 ° C and a condenser temperature of 33.9 ° C. The refrigerant used is R-717 and the system operates in saturated conditions. questions a. COP = Answer. b. Refrigerant flow rate = Answer kg / s. c. Heat loss rate in condenser = Answer kJ / sarrow_forwardWater enters the pump of a steam power plant at 15 kPa and 50°C at a rate of 0.15 m3 /s. The diameter of the pipe at the pump inlet is 0.25 m. What is the net positive suction head (NPSH) at the pump inlet? (a) 1.70 m (b) 1.49 m (c) 1.26 m (d) 0.893 m (e) 0.746 marrow_forwardIn a countercurrent double-pipe heat exchanger, the hot oil entering the inner tube at 420 K with a flow rate of 60 g/s is required to be cooled to 320 K. In the space between the outer tube and the inner tube of the heat exchanger, cooling water flows at the same linear speed as the oil. Cooling water enters the heat exchanger at 290 K. The inner tube inner diameter of the heat exchanger is 25 mm and the outer tube inner diameter is 40 mm. Calculate the length of the heat exchanger. The oil side heat transfer coefficient is 1.6 kW/m2 K, and the water side heat transfer coefficient is 3.6 kW/m2 K. The densities of oil and water can be taken as 0.8 and 1.0 g/cm3, respectively, and the specific heats of oil and water can be taken as 2.0 and 4.2 kJ/kg K, respectively. Wall effects can be neglected. Flow cross-sectional area = (PI)*D2 /4 F2arrow_forward
- A power plant condenser diverts from the power plant water that condenses heat at a rate of 34 [MW] The cooling water enters the condenser at a temperature of 15c and leaves at a temperature 3[C] lower than the water's condensation temperature. The pressure of the water at the exit of the turbine is 9[kpa]The condenser is made of brass tubes with an inner diameter of 25mm and an outer diameter of 30mm and the number of tubes in the condenser is 1000 A. Calculate the cooling water flow.B. Calculate the area of the heat exchanger on the condensing sidearrow_forwardThe enthalpy of steam entering the turbine inlet is 2750 kJ/kg and leaving turbine at 1750 kJ/kg. The enthalpy of saturated liquid is 190 kJ/ kg and enthalpy of dry saturated steam 2600 kJ/kg corresponding to the condenser pressure. The quality of steam at the exit of turbine isarrow_forwardHot water flowing at 0.015 m3/min enters the tube side of a counter current shell & tube heat exchanger at 80 C and leaves at 50 C. Cold oil flowing thru the shell at 0.05 m3/min, with density 800 kg/m3 and specific heat of 2.0 kJ/kg K, enters at 20 C. Consider water specific heat at 4.2 kJ/kg K and density of 988 kg/m3 at above condition, what is the approximate Log Mean Temperature Difference (LMTD)? Show the temperature profile completely labeled.arrow_forward
- Please show step by step solutions for each part As shown in Figure 1, one portion of the hot flue gases is supplied to the steam generator. The steam generator is a shell and tube type of heat exchanger. In this steam generator treated bore water flows through the tubes while the hot flue gases flow in the shell, and steam is produced. The average demand of the steam for other processes within the iron/steel industry is (251) kg/hr at (155) ℃ temperature and 400kPa absolute pressure. Treated bore water is supplied to the steam generator at an average temperature of 20℃. The average pressure drop in the water line of the steam generator is 10kPa. The flue gases enter the shell and tube heat exchanger (steam generator) at a pressure of 110 kPa (Absolute) and a temperature of (252) ℃ and average mass flow rate of (134) kg/min. The average pressure drop in the flue gas side of the steam generator is 5kPa. Flue gases can be assumed to behave as ideal gas and have constant specific heat…arrow_forwardSteam enters the condenser of a steam power plant at a flow rate of 18000 kg/h, a degree of dryness of 0.86 and a pressure of 15 kPa, leaving the condenser as a saturated liquid at the same pressure.A nearby river water is used for the cooling of the condenser.Calculate the water flow rate of the cooler if the water of the river can be heated up to 10°C in order to avoid thermal pollution. (Cp,su=4,18 kj/kgK) (Note: the potential energy change is negligible.)arrow_forwardA 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.arrow_forward
- The refrigerant fluid(Freon 12 or R12) flowing through the pipe with a pressure of 1 MPa and a temperature of 80oC is cooled to 1MPa pressure and 30oC with the air passed through the pipes in a condenser. The air at a flow rate of 800 m3/min enters the condenser at 100 kPa pressure and 27oC temperature and exits at 95 kPa pressure and 60oC temperature. Calculate the mass flow of refrigerant.arrow_forwardA straight-condensing 10,000 kW turbine has a guaranteed steam rate of 5.90 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 92% quality, and it is estimated that fouling will decrease the overall coefficient by 30% during operation. Cooling water is available at 18 ℃, and for design purposes, 1 ½ in OD 16 BWG Brass tubes (thickness = 0.065 in, k=62 BTU/hrftF°.) are specified with 9 C° rise in cooling water, which circulates at 5 ft/s. Inside and outside film coefficients are hi=960 and ho=1474 BTU/hrft2F°. Design a condenser for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor. Determine the followinga) Effective overall coefficient of heat transferb) Volume flow rate of cooling waterc) Number of tubes for single passd) Length of tubesarrow_forwardA R-12 compressor operates betwwen eveoperating temperature of 4 c ( hg = 353 kj/kg ), vg = 0.04895) and condensing temperature of 43 c ( hf = 241.6 kj/kg ).determine the bore diameter of the 4 cylinder 1000 rpm compressor if the piston speed is 200 meter/min and actual volumeter efficiency is 82% and refrigeration load is 25 tonsarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning