Heat Transfer Basics

What does LMTD stand for in heat transfer?

• Linear Mean Temperature Difference

• Logarithmic Mean Temperature Difference

• Longitudinal Mean Temperature Difference

• Local Mean Temperature Difference

Which formula is used to calculate heat capacity?

• Q = mcΔT

• Q = mcΔV

• Q = mcΔP

• Q = mvΔT

In a shell and tube heat exchanger, which fluid flows through the tubes?

• The fluid that needs to be stored

• The fluid that needs to be filtered

• The fluid that needs to be heated or cooled

• The fluid that needs to be pressurized

What is the formula for calculating Log Mean Temperature Difference (LMTD)?

• LMTD = (ΔT1 + ΔT2) / (ln(ΔT1 / ΔT2))

• LMTD = (ΔT1 * ΔT2) / (ln(ΔT1 / ΔT2))

• LMTD = (ΔT1 - ΔT2) * (ln(ΔT1 / ΔT2))

• LMTD = (ΔT1 - ΔT2) / (ln(ΔT1 / ΔT2))

What is the SI unit of heat capacity?

• J/K

• W/A

• m/s

• Kg/m^2

What is the purpose of a shell in a shell and tube heat exchanger?

• Reduce heat transfer efficiency

• Contain the tube bundle and direct fluid flow

• Store additional heat

• Increase pressure drop

How is the overall heat transfer coefficient calculated in a heat exchanger?

• Division of total heat input by temperature difference

• Sum of all thermal resistances

• Reciprocal of the sum of all thermal resistances

• Multiplication of individual thermal resistances

What is the significance of heat capacity in heat transfer processes?

• Heat capacity only affects solid substances in heat transfer.

• Heat capacity determines the color of an object during heat transfer.

• Heat capacity is irrelevant in heat transfer processes.

• Heat capacity helps in understanding how substances respond to changes in temperature and how much heat they can absorb or release during heat transfer.

What is the main advantage of using a shell and tube heat exchanger?

• Limited durability

• High efficiency in heat transfer

• Low efficiency in heat transfer

• Complex maintenance requirements

How does the heat transfer rate change with an increase in LMTD?

• The heat transfer rate increases with an increase in LMTD.

• The heat transfer rate is not affected by LMTD.

• The heat transfer rate remains constant with an increase in LMTD.

• The heat transfer rate decreases with an increase in LMTD.