Question

Of the following thermal properties of a refrigerant, the undesirable ones are

A) High viscosity, low pour point
B) High latent heat of evaporation
C) Low critical and high freezing temperature
D) High viscosity and high film heat conductivity

Answer 1

The undesirable thermal properties for refrigerants are high viscosity and high film heat conductivity, which impair circulation and heat-absorption efficiency, while high latent heat of evaporation is actually a desired property for efficient cooling.

Step-by-step explanation:

Of the following thermal properties of a refrigerant, the undesirable ones are: (a) High viscosity, low pour point (b) High latent heat of evaporation (c) Low critical and high freezing temperature (d) High viscosity and high film heat conductivity. The undesirable properties of refrigerants include high viscosity and high film heat conductivity because high viscosity results in lower fluidity which can impair the refrigerant's ability to circulate through the cooling system effectively. Additionally, high film heat conductivity could mean the refrigerant does not absorb heat as efficiently. Meanwhile, a high latent heat of evaporation is typically desired in a refrigerant because it implies that more heat can be absorbed during the phase change from liquid to vapor, without a change in temperature, which is ideal for cooling systems.