Cost targeting and HEN optimization

The heat recovery _______ with the increase of dTmin

• maintains

• increases

• decreases

• depends

The ______ the heat recovery, the _______ the utilities consumption

• higher, higher

• lower, lower

• higher, lower

• higher, same

The increase in heat recovery will __________ the capital cost of HEN

• not affect

• increase

• decrease

• neglect

The cost of utilities represent the _________ for HEN

• operating cost

• capital cost

• total cost

• all of the answers

The area of heat exchanger can be calculated based on the _________ formula

• Q/(U x dTmin)

• Q/(U x LMTD)

• Q x U x dTmin

• Q x U x LMTD

A circuit through the network that starts at a heater and ends at cooler is a _______

• loop

• threshold

• path

• pinch

The MER design can be optimised by removing __________ heat transfer unit with some ________ in the utilities consumption

• big, increase

• big, decrease

• small, increase

• small, decrease

_______ present because we designed the network independently for both sides of the pinch

• Loop

• Path

• Pinch

• threshold

________ is used to restore back the dTmin violation after breaking a _______

• loop, path

• path, loop

• loop, pinch

• pinch, path

After loop breaking, _____ rules can be violated, but the ______ needs to be restored

• dTmin, pinch

• dTmin, path

• pinch, path

• pinch, dTmin