A counter flow single body single pass heat exchanger is used to cool the lubricating oil of an industrial gas turbine. The flow rate of the cooling water flowing in the pipe is 0.2 kg/s and the pipe diameter is 25mm. The flow rate of the oil flowing between the pipe and the body is 0.1 kg/s and the body diameter is 45 mm. Oil enters at 100°C, while water enters at 30°C. What should be the length of the pipe so that the outlet temperature of the oil is 60 °C ?

A counter flow single body single pass heat exchanger is used to cool the lubricating oil of an industrial gas turbine. The flow rate of the cooling water flowing in the pipe is 0.2 kg/s and the pipe diameter is 25mm. The flow rate of the oil flowing between the pipe and the body is 0.1 kg/s and the body diameter is 45 mm. Oil enters at 100°C, while water enters at 30°C. What should be the length of the pipe so that the outlet temperature of the oil is 60 °C ?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

! Required information Consider operation of a single-pass cross-flow heat exchanger with water (cp=4193 J/kg-K) (mixed) and methanol (cp=2577 J/kg-K) (unmixed). Water entering and exiting the heat exchanger at 93°C and 60°C, respectively, is used to heat the methanol initially at 10°C. The overall heat transfer coefficient and the total heat transfer rate is estimated to be 650 W/m².K and 250 kW, respectively. An effectiveness of at least 0.5 is to be achieved. Calculate the mass flow rate of water. (Round the answer to two decimal places.) The mass flow rate of water is kg/s.
A shell &tube heat exchanger has 4 tube passes. Oil inters to the tubes with 100oC . Mass flow rate of the oil is 3 Kg /s and its heat capacity is 2.1 Kj/KgoC. In the shell side air passes with 2 Kg /s Mass flow rate and 1.009 Kj/KgoC heat capacity. Input temperature of air is 20 oC and output temperature is 80 oC. Overall heat transfer coefficient is 200 W/m2 oC. Considering outer diameter of tubs 2cm and tube length 2 m, determine number of tubes in each pass
A counterflow, concentric tube heat exchanger is designed to heat water from 34 to 80 deg C using hot oil,which is supplied to the annulus at 174 deg C and discharged at 140 deg C. The thin-walled inner tube has a diameter of Di=34 mm and the overall heat transfer coefficient is 500 W/m2. K. The design condition calls for a total heat transfer rate of 4400 W. What is the length of the heat exchanger? Select one: a. 0.82485 b. 1.0478 c. 0.95849 d. 0.7013
(b) In a shell-and-tube heat exchanger, with one shell pass and four tube passes, water entering at 25°C and volume flowrate is being used to cool oil from 120°C. The mass flow rate of oil has recently been increased to 150 000 kg h-1. There is a total of 780 tubes of 5.0m length and 23.0mm outside diameter and 2 mm thickness. From the previous operation, the overall heat transfer coefficient of the exchanger is known to be 720 W m-2K-1. Specific heat capacity of oil is 2100 J kg-1K-1. 175. 514 m3 h-1 (i) Use the &NTU method to find the exit temperature of the oil at the new flow rate. (ii) show, by calculation, how would the outlet oil temperature change if the oil mass flowrate would again increase by 28%, based on the value stated in the question (b).
in a 10-m long center-current flow tubular heat exchanger, a liquid food, flowing in the inner pipe (inside diameter 5 cm), is heated from 4 to 60 C for pasteurization. In the outer tube (diameter 10 cm), hot water enters at 95 C and exits at 80 C. A) If the mass flow rate of the hot water is 5 kg/s, what is the flow rate of the pasteurized product? The specific heat of the water is 4.2 kJ/(kg C), specific heat of product is 3.8 kJ/(kg C) B) what is the log mean temperature difference C) What is the overall heat transfer coefficient for the heat exchanger based on the outside surface?
In a double-pipe, counter-flow heat exchanger, water entering at 1.5 kg/s is heated from 25°C to 70°C as it flows thru the inner pipe. Hot oil enters the heat exchanger at 2.5 kg/s and 115°C. The convection heat transfer coefficients in the cold- and hot-sides are 100 and 50 kW/m2.°C, respectively. Calculate the required heat transfer area in m2. Take Cp= 4.18 kJ/kg.°C for water, and cp = 1.67 %3D %3D kJ/kg.°C for oil.
In a double-pipe, counter-flow heat exchanger, water entering at 1 kg/s is heated from 23°C to 69°C as it flows thru the inner pipe. Hot oil enters the heat exchanger at 2 kg/s and 110°C. The convection heat transfer coefficients in the cold- and hot- sides are 100 and 50 kW/m2.°C, respectively. Calculate the required heat transfer area in m?. Take c, = 4.18 kJ/kg.°C for water, and c, = 1.67 kJ/kg.°C for oil. Round your answer to 2 decimal places.
5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfer coefficient based on the gas-side surface area is U₁ = 100 W/m².K. Determine the required gas-side surface area A₁ using the LMTD and & -NTU method.
A 2 - shell pass & 4 - tube pass heat exchanger is designed to heat water from 40 C to 90 C flowing inside the tubes at a rate of 7.5 kg/sec while hot gases flowing in the shell at a rate of 10.42 kg/sec with temperature leaving the heat exchanger at 110 C. Consider the specific heat of water and gas of 4.2 kJ/kg K & 1.08 kJ/kg K, respectively. Draw the temp-profile showing the multi-pass effect and determine the temperature of gas entering the heat exchanger.
A shell-and-tube heat exchanger with 2 shell passes and 12 tube passes is used to heat water (cp = 4180 J/kg•K) in the tubes from 20 °C to 70 °C at a rate of 4, 5 kg/sec. Heat is supplied by hot oil (cp = 2300 J/kg•K) entering the shell side at 170 °C at a rate of 10 kg/s. For a total heat transfer coefficient on the tube side of 350 W/m²•K, determine the area of the heat transfer surface on the tube side. Mainly, I also need the solution from concepts of how the heat flow behaves in the system, it can be with a diagram.
Water 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 °C
A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30°C to 80°C at a rate of 5.25 kg/s. The exhaust gases enter and exit the exchanger at 225°C and 100°C, respectively. What is the mass flow rate of the hot gases (kg/s) ? Water : c = 4184 J/kg K, Hot gases 1019 J/kg K :c = Select one: %3D