Engineering
Engineering, 05.09.2019 20:30, jaybeast40

The exhaust-gas temperature leaving a continuously operating furnace is 260 c, and a proposal is being considered to install a heat exchanger in the exhaust-gas stream to generate low-pressure steam at 105 c. the question to be investigated is whether it is economical to install such a heat exchanger, and, if so, to find its optimum size. the following data apply: flow of exhaust gas, 7.5 kg/s. specific heat of exhaust gas, 1.05 kj/(kg k). value of the heat in the form of steam, $1.50 per gigajoule. u value of heat exchanger based on gas-side area, 23 w/(m2 k). cost of the heat exchanger including installation based on gas-side area, $90 per square meter. interest rate, 8 percent. life of installation, 5 years. saturated liquid water enters heat exchanger at 105 c and leaves as saturated vapor. (a) develop the equation for the savings as a function of the area, expressed as a uniform annual amount.(b) what is the maximum permitted area if the exit-gas temperature is to be above 120 c in order to prevent condensation of water vapor from the exhaust gas? (c) use a seven-point fibonacci search and set up a table to simplify calculation of the optimum heat-transfer area.

answer
Answers: 3

Other questions on the subject: Engineering

image
Engineering, 04.07.2019 16:10, TheOriginalMeyah
An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)
Answers: 2
image
Engineering, 04.07.2019 18:10, sarahgrindstaff123
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
image
Engineering, 04.07.2019 18:10, alyssabailey7545
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
Answers: 1
image
Engineering, 04.07.2019 18:10, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Do you know the correct answer?
The exhaust-gas temperature leaving a continuously operating furnace is 260 c, and a proposal is bei...

Questions in other subjects: