Find the duty of this heat exhanger when new: Q6: Say we have a heat exchanger made to heat 150 liters/minute from 20 degrees celsius to 80 degrees celsius. Each section of the heat exchanger, which is a circular pipe, is 10m long. The outer diameter is 2in, and the thickness of the pipe is 1 / 8 inch. As the heat exchanger is operated, lime is built up known as fouling. The heat exahnger uses N number of pipes, where water passes through the pipe and hot gas is on the outside. k(foul) = 0.5 W/mK, K(foul) increases at 1mm/year, however there is no lime build up initially because the heat exchanger is new. Steel thermal conductivity is k(steel) = 50 W/mK while the convection coefficient between the water in the tube and the inside wall of the pipe is 1000 W/m^2K, and the convection coefficient of the outside pipe and hot gas is 100 W/m^2K.

Find the duty of this heat exhanger when new: Q6: Say we have a heat exchanger made to heat 150 liters/minute from 20 degrees celsius to 80 degrees celsius. Each section of the heat exchanger, which is a circular pipe, is 10m long. The outer diameter is 2in, and the thickness of the pipe is 1 / 8 inch. As the heat exchanger is operated, lime is built up known as fouling. The heat exahnger uses N number of pipes, where water passes through the pipe and hot gas is on the outside. k(foul) = 0.5 W/mK, K(foul) increases at 1mm/year, however there is no lime build up initially because the heat exchanger is new. Steel thermal conductivity is k(steel) = 50 W/mK while the convection coefficient between the water in the tube and the inside wall of the pipe is 1000 W/m^2K, and the convection coefficient of the outside pipe and hot gas is 100 W/m^2K.

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.52P

See similar textbooks

Similar questions

Completely solve and provide the diagram. Box the final answer. Write legibly 3. A single-pass tubular type heat exchanger heats air from 38°C to 80°C. Exhaust gas from DIESEL engine at 350°C is used as heating medium. If the final temperature of exhaust gas leaving the heat exchanger is 140°C, what is the LMTD?
Hint: Assume your own initial conditions
A liquid food is heated in a tubular heat exchanger. The inside pipe wall temperature is 110°C. The internal diameter of the pipe is 30 mm. The product flows at 0.5 kg/s. If the initial temperature of the product is 7°C, compute the convective heat-transfer coefficient. The thermal properties of the product are the following: specific heat = 3.7 kJ/[kg°C], thermal conductivity = 0.6 W/[m °C], product viscosity = 500 x 10^-6 Pa s, density = 1000 kg/m³, product viscosity at 110°C = 410 x 106 Pa s. The length of the heat exchanger is 1m.
A large artery has an inner radius of 4×10-3 m, the flow rate of the blood is 1 cm3/s. Find (a) the mean and maximum velocities of the blood, (b) the pressure drop in an artery fragment 0.1 m long, (c) the power necessary to maintain this flow in said fragment, (d) the number of Reynolds. Consider that for blood: η = 2.08 × 10-3 Pas, ρ = 1.06 × 103 kg / m3
Task 02 Water flows through a cast steel pipe ( k = 50 W/m.K ) with an outer diameter of 104 mm and 2 mm wall thickness. (i). Calculate the heat loss by convection and conduction per metre length of un insulated pipe when the water temperature is 15 0C , the outside air temperature is -10 0C , the water side heat transfer coefficient is 30 kW/m2.K and the outside heat transfer coefficient is 20 W/m2.K . (ii). Calculate the corresponding heat loss when the pipe is lagged with insulation having an outer diameter of 365 mm, and thermal conductivity of k= 0.05 W/m.K
V:32) The jet on a water feature shoots a column of water 75 ft. high. The nozzle is located just above the surface of a reflecting pool and has a diameter of 2 in. A submersible pump with a 4 in dia outlet and an 8 in. diameter intake pipe located 3.25 ft. below the surface of the pool operates the jet.1. Write an expression to determine the velocity of the water coming out of the nozzle.2. Find the velocity of the water at the nozzle exit.3. Find the velocity at point A just inside the inlet.
A) An intern has to estimate the purchased equipment cost (PEC) of a new heat exchanger. The company recently purchased a smaller exchanger (Area = 250 m2) for $22,000. What is the PEC of a new heat exchanger (Area = 500 m2)? Use the 6/10 rule in your calculation
Find the required area A for the heat transfer neglecting any convective heat transfer in the flows.A large condenser (heat exchanger) in a power plant must transfer a total of 100 MW from steam running in a pipe to sea water being pumped through the heat exchanger. Assume the wall separating the steam and seawater is 5 mm of steel, conductivity 16 W/m K and that a maximum of 3.5°C difference between the two fluids is allowed in the design. Find the required minimum area for the heat transfer neglecting any convective heat transfer in the flows.
The pumping power of the human heart is approximately 2W (assuming a normal cardiac output of 5 liters/min). Like any pump, however, the heart is not 100% efficient, and, therefore, the power that is supplied to the heart muscle will actually exceed 2W. In this question we will estimate the heart’s pumping efficiency η by calculating how much energy is supplied to the heart muscle from the blood.(Note that the heart muscle has its own vasculature, called the coronarycirculation.) (a) When we calculated the pumping power of the heart, we only considered the head gain across the heart from the pressure increase. In general, there could also be changes in elevation (very small) and in kineticenergy. Estimate the ratio of kinetic energy head to pressure head at peaksystole, when pressure is 120 mmHg and blood velocity is 100 cm/s.Can we safely neglect kinetic energy gains in calculating pumpingpower?(b) At rest, the coronary blood flow is 225 ml/min, and 65% of the O2 isremoved from the…
Derive the steady flow equation from first principles
resolve the following problem
a. Given the static head of 28.91 m, and static pressure head of 3.15 cm WC. What is the normal pressure, Pn? b. What is the Static efficiency of the fan if the air flow rate is equal to 3.8 5m /sec, total head of 68.72 m, velocity head of 30.86 m, mechanical efficiency and power are 39.12% and 35.72 KW at 30.69°C, respectively. c. Solve for the area at entrance of the fan blade, if the it has a 346mm diameter, flow of air is equal to 23.328 m/se and flow rate of 3.05 m³ /second.