A heat exchanger (cross flow) consists of 40 tubes with 1cm diameter located in a square of 1m by 1m. Cold water( cp=4180 J/kg C) enters the tubes at 18C with an average velocity of 3m/s. Hot air (cp=1010 J/kg C) by that time enters thechannel at 130C and 105 kPa at an average velocity of 12 m/s. if the overall heat transfer coefficient is 130 W/m2C,determine(a) the output temperatures of both fluids(b) the rate of heat transfer.Hints: There is no fin attached to the tubes.1 mHot air130°C105 kPaWater12 m/s18°C3 m/s000

Given data as per question No. of tubes = 40 tubes Diameter of the tubes = 1 cm Cold water…

Answered: A heat exchanger (cross flow) consists…

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

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Engr. Dizon, a mechanical engineer, is planning to construct a cooling water pond in Laguna for a power plant. The power plant is known to discharge 20 m/s of cooling water. Estimate the required surface area (in hectares) of the pond if the water temperature is to be lowered from 45 C at its inlet to 35.5 C at its outlet. Assume specific heat of water is 4.186 kJ/kg-K, and an overall heat transfer coefficient of 0.0412 kJ/s-m2-K. Round off your answer to the nearest whole number.
Water enters at 20 °C at a rate of 0.1 kg/s in a double-pipe counter flow heat exchanger is to be heated by hot air that enters the heat exchanger at 110 °C at a rate of 0.3 kg/s. The overall heat transfer coefficient based on the inner side of the tube to be 100 W/m2. °C. The length of the tube is 14 m, and the internal diameter of the tube is 1.4 cm. Determine the outlet temperature of the water. The specific heats of the water and air are given to be 4.18 and 1.01 kj/kg.°C, respectively. Select one: O a. 31.3 °C O b. 22.6 °C O C. 24.7 °C O d. 25.5 °C
A steam condenser operates at 61 cm of Hg vacuum. The steam enters the condenser with a moisture content of 87%. Cooling water is supplied to the condenser at a temperature of 20 C with a terminal difference of 5 C. The water velocity of water inside the tube is to be limited to 2.5 m/s when using 2.5 cm outside diameter tubes whose thickness is 1.75 mm. The overall heat transfer coefficient of the tubes could be approximated by the equation U = 1213.4(v1/2), W/(m2-C) where v is the water velocity in m/sec. Determine: 1. The required mass flow of cooling water, kg/s 2. The required capacity of the circulating pump, liter per second 3. The Logarithmic Mean Temperature Difference, C 4. The required Number of tubes 5. The required length of tubes, (m), and number of passes
Air at (2.9000x10^2) K is entering in a circular pipe at 101325 Pa as shown in Figure. The velocity of the air at the pipe entrance is (1.00x10^0) m/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet temperature if 2000 J of heat is added to the pipe.
The oil (cp = 1 795 W-s/kg-K) from an oil-cooled electric transformer is cooled from 79.4 oC to 29.4 oC at the rate of 1 360.5 kg/h. This is done in an oil-water het exchanger that receives 2 948 kg/h of water at 15.6 Celsius. For the exchanger, U = 295 W/m2-K. Find the exit water temperature and heating area required (a) for counter flow and (b) for parallel flow.
Q=2000J Tout=? V(m/s) D=0.1m air Air at (3.050x10^2) K is entering in a circular pipe at 101325 Pa as shown in Figure. The velocity of the air at the pipe entrance is (1.50x10^0) m/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet temperature if 2000 J of heat is added to the pipe. Answer should be in 'K' with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer DELL
A long, thin-walled double-pipe heat exchanger with tube and shell diameters of 0.01 m and 0.025 m, respectively, is used to condense refrigerant-134a with water at 20°C. The refrigerant flows through the tube, with a convection heat transfer coefficient of hi= 4100 W/m² °C. Water flows through the shell at a rate of 0.3 kg/s. The thermal resistance of the inner tube is negligible since the tube material is highly conductive and its thickness is negligible. Both the water and refrigerant-134a flows are fully developed. Properties of the water and refrigerant-134a are constant. Water properties: p = 998 kg/m³, v=u/p-1.004x 10-6 m²/s, k = 0.598 W/m. °C, Pr = 7.01 Cold water D Do

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