Engineering, 05.12.2019 21:31 Calirose

Aregenerator is used to preheat milk before it is pasteurized. the regenerator is a shell-and-tube heat exchanger with one shell pass and two tube passes. cold milk enters the regenerator at a temperature of 10oc and hot milk, which has recently completed the pasteurization process, enters at 75oc. after leaving the regenerator, the heated milk enters a second heat exchanger that further raises its temperture to 75oc. this system is used in a pasteurization process in which the flow rate of the milk is 7.5 kg/s. the manufacturer of the heat exchanger specifies that for this flow rate, the overall heat transfer coefficient is 2500 w/m2-k. use the properties of water for the milk. if an effectiveness of 0.5 is desired, find

(a) the required heat transfer area

(b) the rate of heat recovery

(c) the fluid outlet temperatures

the hot fluid in the secondary heat exchanger derives its energy from the combustion of natural gas, and the burner has an efficiency of 95%. the facility operates continuously and the cost of natural gas is $0.010/mj.

(d) what is the annual savings in energy associated with the use of the regenerator.

Answers: 2

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Answers: 3

Answer

Engineering, 04.07.2019 18:10

What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information

Answers: 3

Answer

Engineering, 04.07.2019 19:20

A21-tooth spur pinion mates with a 28-tooth gear. the diametral pitch is 3 teeth/in and the pressure angle is 20°, find the following values: the addendum, dedendum, circular pitch, tooth thickness, and base circle diameters.

Answers: 2

Answer

Engineering, 06.07.2019 04:20

Consider a spherical container of inner radius , outer radius r2, and thermal conductivity k. express the boundary condition on the inner surface of the container for steady one-dimensional conduction for the following cases: (a) specified temperature of 50°c, (b) specified heat flux of 30 w/m2 toward the center, (c) convection to a medium at t with a heat transfer coefficient of h

Answers: 2

Answer

You know the right answer?

Aregenerator is used to preheat milk before it is pasteurized. the regenerator is a shell-and-tube h...

Questions