Ref and Filters

Question 1

What are the specific heat for ice and steam?

Answer 1

0.5Btu/Lb and 0.46Btu/Lb

Question 2

what are the latent heat for water at freezing/melting and vapourizing/condensing?

Answer 2

144Btu/Lb and 970Btu/Lb

Question 3

adiabatic compression

Answer 3

Compressing refrigerant gas without removing or adding heat.

Question 4

enthalpy

Answer 4

The heat content of a system at constant pressure. The heat in 1lb of substance at -40F

Question 5

entropy

Answer 5

a measure of energy transfer but not used to do work due to the random movement of molecules

Question 6

Pleated filter

Answer 6

Filter with fibrous media filter folded to increase surface area
Captures particles from 3 to 10 microns

Question 7

Viscous impingement filters

Answer 7

Filter coated with sticky substance

Question 8

HEPA

Answer 8

Types of filter to filter out 99.7% of particulates above 0.3 microns

Question 9

ULPA

Answer 9

Type of filters that filter out 99.9% of particulates above 0.01 microns

Question 10

3 ways for air filter testing

Answer 10

Fractional test, atmospheric dust spot test, and average synthetic dust weight arrestance test

Question 11

Magnehelic type gauges and manometers

Answer 11

Measure pressure drops across filters

Question 12

MERV

Answer 12

Minimum efficiency reporting value
Effectiveness of air filters from 1 - 20

Question 13

90 in 90

Answer 13

Capacity of receiver 90% at 90°F

Question 14

What’s average synthetic dust weight arrestance test?

Answer 14

Compares the weight of dust captured by the filter and the dust fed

Question 15

What’s the atmospheric dust spot efficiency test

Answer 15

Sees how much dust stains a white piece of paper

Question 16

What’s the fractional test for filters

Answer 16

Compares the amount of dust between the 2 sides of the filter