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This quiz contains multiple-choice problems on an overview of condensers, heat transfer coefficients, direct and indirect contact condensers, condenser types, temperature enthalpy diagrams, condensers recap, and refrigeration systems
With condensation occurring in fluid mixtures possibly having a non-condensing gas, the variation of the equilibrium temperature with enthalpy can be a __ function.
Linear
Non-linear
Quadratic
Parabolic
The thermal design of a condenser is considerably __ than that of a single-phase heat exchanger.
The same
More complicated
Less complicated
Not relatable
In condensation from mixtures with or without a non-condensing gas, the assumptions underlying the logarithmic mean temperature difference are valid. True or false?
True
False
In condensation from mixtures with or without a non-condensing gas, the assumptions underlying the logarithmic mean temperature difference are invalid. What method can we adopt to cope with this problem?
Zonal distribution
Taking linear groups of enthalpy curves for LMTD calculations
Apply LMTD anyway
Apply average LMTD
Which of the following statements is correct about the temperature-enthalpy relationship of a mixture?
Sub-cooled at the entrance
Sub-heated at the entrance
Superheated at the entrance
Superheated at the exit
The temperature-enthalpy relationship of a mixture represents the coolant flow in
Single phase
Double phase
Triple phase
Any phase possible
If there is a decrease in viscosity, the heat transfer coefficient
Increase
Decrease
Remains the same
Becomes zero
As thermal conductivity kF increases, the heat transfer coefficient
Increases
Decreases
Remains the same
Jumps to a higher value
A high value of latent heat hfg means that the heat transfer coefficient would
Increase
Decrease
Remain the same
Become zero
An increase in diameter means a/an __ heat transfer coefficient.
Larger
Smaller
Zero
Infinite
A large temperature difference value will lead to more condensation and, hence, a __ heat transfer coefficient.
Larger
Smaller
Zero
Infinite
An increase in the number of tubes will lead to larger condensate thickness in the lower tubes, leading to a/an __ heat transfer coefficient.
Larger
Smaller
Zero
Infinite
If condensation occurs at the tubes’ outside surface, the equation for the heat transfer coefficient will not change. True or false?
True
False
If the coolant is not in multiple-phase and the overall heat transfer coefficient is constant, the assumptions underlying the logarithmic mean temperature difference
Are valid
Are invalid
Not all but some are valid
Single assumption invalid
Why do we divide the temperature-enthalpy relationship of a mixture into zones?
To calculate LMTD for each zone
To calculate (T{sat} - T{liquid}) for each
To calculate resistance for each
To make the solving process easier
