## Calculate area of heating surface, Electrical Engineering

Assignment Help:

Question:

An evaporator is a device in which a feed stream is concentrated by boiling a solution. A combination of heating and reduced pressure are used to induce the boiling. Consider a single- stage evaporator as shown schematically below. The feed flow rate is 40,000 lb/hr of a sugar solution, and the feed is at a temperature of 200°F and a concentration of 5% solids. It is to be concentrated to a "thick liquor" of 45% solids by condensing saturated steam at 250°F inside heating tubes that are in the boiling liquid. The water vapor leaving the boiling solution becomes saturated at the condenser, where it has a temperature of 125°F.

The temperature of the boiling liquid is 150°F. The overall heat transfer coefficient U between the heating tubes and the boiling liquid is 600BTU/hrft 2 °F.

The specific heats of all solutions (water and sugar solution) can be assumed to be 1 BTU/lb°F. There is no precipitation of solids in the evaporator, heat losses are negligible, and all condensates leave at the condensing temperature.

You are to calculate the following:

a. The area (in ft2) of heating surface needed for the heating tubes;

b. The steam consumption per hour;

c. The pounds of water evaporated per pound of steam.

Hint: Do a material balance to find the amount of vapor that must be removed from the feed the increase its concentration as specified. Then, do a heat balance, accounting for the latent heat of the condensing steam in the heating tubes and the vapor being removed from the feed, in addition to the fact that the feed temperature is different than the temperature in the evaporator.

#### Write explanatory notes on paging, Write explanatory notes on Paging. T...

Write explanatory notes on Paging. The memory paging mechanism located inside the 80386 and above permits any physical memory location to be allocated to any linear address. Th

#### Power control - motor control , Power Control A chopper converts  fix...

Power Control A chopper converts  fixed  de input voltage to a controllable dc output voltage. It is  the single  stage dc to dc conversion device. It is a high  speed  on/ of

#### Describing the steady state effect , Select the response describing the ste...

Select the response describing the steady state effect of increasing the air gap for otherwise identical devices, one operating with constant DC voltage excitation and one with con

#### Usage of transistor, Usage of transistor: The bipolar junction transis...

Usage of transistor: The bipolar junction transistor that is abbreviated as BJT was the most generally used transistor in the 1960s and 70s. Even later than MOSFETs became ext

#### Regions of operation in bjt, Q. Regions of operation in BJT ? Transisto...

Q. Regions of operation in BJT ? Transistor find many applications like amplifier, switch etc. depending upon the polarity and the magnitude of the applied voltages across the

#### What is a resistor?, what is a resistor?

what is a resistor?

#### Electrical measurement 2, describe the circuit and working of a q meter?

describe the circuit and working of a q meter?

#### E. mechanics, a train weight 5 megaN is taking a slope of 1 in 200 at 45 km...

a train weight 5 megaN is taking a slope of 1 in 200 at 45 kmper hour.the engine put in 100 kw.determine the power to be put in by the engine it the train take the slope up of 1 in

#### Output waveforms for a differentiating circuit, Q. Discuss the output wavef...

Q. Discuss the output waveforms for a differentiating circuit. The output waveform from a differentiating circuit depends upon the time constants and shape of the input wave.Th

#### Find the voltage at the load terminal, Q. Two three-phase generators are su...

Q. Two three-phase generators are supplying to a common balanced three-phase load of 30 kW at 0.8 power factor lagging. The per-phase impedance of the lines connecting the generato