A double tube heat exchanger is made of copper (k = 380 W / m. ° C). Inner diameter of inner tube Di = 1.2 cm, outer its diameter is D0 = 1.6 cm and the diameter of the outer pipe is 3.0 cm. Convection heat transfer coefficient on the inner surface of the pipe high = 700 W / m2 . ° C and the heat transfer coefficient on the outer surface h0 = 1400 W / m2 . ° C. Pipe side contamination factor Rf, i = 0.0005 m2 . ° C / W and fouling factor Rf on the body side, 0 = 0.0002 m2 . ° C / W According to the example; Total heat tr

A double tube heat exchanger is made of copper (k = 380 W / m. ° C). Inner diameter of inner tube Di = 1.2 cm, outer its diameter is D0 = 1.6 cm and the diameter of the outer pipe is 3.0 cm. Convection heat transfer coefficient on the inner surface of the pipe high = 700 W / m2 . ° C and the heat transfer coefficient on the outer surface h0 = 1400 W / m2 . ° C. Pipe side contamination factor Rf, i = 0.0005 m2 . ° C / W and fouling factor Rf on the body side, 0 = 0.0002 m2 . ° C / W According to the example; Total heat tr

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.1P: 10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm...

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Mot water is used to heat air in a double-pipe heat exchanger as shown in the following sketch. If the heat transfer coefficients on the water side and on the air side are 550W/m2Kand55W/m2K respectively, calculate the overall heat transfer coefficient based on the outer diameter. The heat exchanger pipe is 5-cm, schedule 40 steel (k=54W/mK) with water inside.
10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.
A double tube heat exchanger is made of copper (k=380 W/m.°C). Inner diameter of inner tube Di=1.2 cm, outer diameter D0=1.6 cm and the diameter of the outer tube is 3.0 cm. Convection heat transfer coefficient on the inner surface of the pipe hi=700 W/m2 .°C and the heat transfer coefficient on the outer surface h0= 1400 W/m2 .°C. on the pipe side contamination factor Rf,i=0.0005 m2 .°C/W and the contamination factor on the body side Rf,0 = 0.0002 m2 .°C/W as it is; a) The thermal resistance of the heat exchanger per unit length, b) Total heat transfer coefficients (U0 and Ui) taking into account the inner and outer surface areas of the pipe calculate.
A radiator heat exchanger is to be designed for the following specifications. Hot gas at 1145°C, Cold gas temperature 45°C, Unit surface conductance on the hot side, 230 W/m2-K, Unit surface conductance on the cold side 290 W/m2-K, Thermal conductivity of the metal wall 1115 W/m-K. Find the maximum thickness (in mm) of the metal wall between the hot gas and the cold gas so that the maximum temperature of the wall does not exceed 545°C.
A double tube heat exchanger is made of copper (k = 380 W / m. ° C). Inner diameter of inner tube Di = 1.2 cm, outerits diameter is D0 = 1.6 cm and the diameter of the outer pipe is 3.0 cm. Convection heat transfer coefficient on the inner surface of the pipehigh = 700 W / m2. ° C and the heat transfer coefficient on the outer surface h0 = 1400 W / m2. ° C. Pipe sidecontamination factor Rf, i = 0.0005 m2. ° C / W and fouling factor Rf on the body side, 0 = 0.0002 m2. ° C / WAccording to the example; Calculate the thermal resistance of the heat exchanger per unit length.
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.
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).
(1)aA double pipe heat exchanger is constructed of a copper (k=380Wm.K) inner tube of internal diameter D1=1.2cm and external diameter D0=1.6cm and an outer tube diameter 3.0cm.The convection heat transfer coefficient is reported to be hi=700W/m2.K on the inner surface of the tube and h0 =1400W/m2.K on its outer surface.For a fouling factor Rf,I=0.0005m2.K/W on the tube side and Rf,o=0.0002m2.K/W on the shell side, determine (I) the thermal resistance of the heat exchanger per unit length.(ii) the overall heat transfer coefficients Ui and U0 base on the inner and outer surface area of the tube, respectively. (b)Classify heat exchangers according to the flow type and explain the characteristics of each type. (c)How does the presence of baffles affect the heat transfer and the pumping power requirements? Explain (d) Consider a hot baked potato.Will the potato cool faster or slower when we blow the warm air coming from our lungs on it instead of letting it cool naturally in the cooler…
b) A shell and tube heat exchanger is constructed of a copper having inner tube of inner diameter 2.8 cm and outer diameter D, = 4.0 cm and an outer tube of diameter 5.2 cm. The length of the tube is 10 m. The convection heat transfer coefficient is given to be h = 750 W /M²°C on the inner surface of the tube and h, = 1350 W/m2°C on the outer surface. Determine | i. The thermal resistance of the heat exchanger ii. The overall heat transfer coefficients U; and U, based on the inner and outer surface areas of the tube, respectively.
1- For the following design conditions:- Condenser heat load (Qc) = 293 MW Condenser Pressure (Pcond) = 0.06 bar Cooling Water inlet temperature (tw,) = 25 C° Cooling Water velocity (Vw) = 2 m/s Number of Passes (N) = Single Tube Diameter (D) Tube Length (L) = 15 m Tubes Cleanliness factor (Fclean) = 0.85 Overall heat transfer coefficient (U,) = 4000 W /m²C°. Calculate the following:- = 25 mm a. Condenser Surface area b. Cooling water mass flow rate c. Condenser effectiveness
Hot 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.
3) For a 1 shell, 30 tube heat exchanger, the inlet temperature of the shell is 8 C and the outlet temperature of the shell is 32. The inlet temperature of the tube is 140 and the outlet temperature of the tube is 30. If the tubes have an outside diameter of 5 cm, how much heat is exchanged over a minute? You can assume the overall heat transfer coefficient is 240 W/m?K. a. Calculate the LMTD for this heat exchanger. LMTD= (Tz- ti) - CTI -+2) (T.-t2)