Introduction to Indirect and Specialty systems

Question 1

Refrigeration and Air conditioning systems can be divided into three types of equipment arrangements or operations; name 3

Answer 1

1. direct
2. dry
3. flooded

Question 2

Indirect systems use water, ____, or a eutectic solutions as the secondary refrigerant. Can be dry or flooded

Answer 2

brine

Question 3

liquid overfeed recirculated ammonia refrigeration systems can use ____-____ compression, ____-stage or _______ compression

Answer 3

single-stage, multi stage, booster

Question 4

An indirect open spray system is one in which the secondary refrigerant is in direct contact with the ___ or other substance to be heated or cooled

Answer 4

air

Question 5

Where would an indirect open spray system using a secondary refrigerant be used?

Answer 5

fast food package freezing applications, not sprayed directly on food

Question 6

A double indirect open spray system is one in which the secondary refrigerant from an indirect open spray system is heated or cooled by the secondary coolant circulated from a ______ enclosure

Answer 6

secondary

Question 7

A double indirect open spray system is used in ____ ________ applications as it uses a secondary refrigerant that is rated to be food safe and if a leak develops it will be contained

Answer 7

food processing such as fish

Question 8

An indirect vented closed system is one in which the secondary refrigerant passes through a closed circuit in the air or substance being heated or cooled, except that the evaporator or condenser is placed in an ____ or appropriately ______ tank

Answer 8

open, vented

Question 9

Indirect closed circuit system is one in which a secondary refrigerant passes through a closed circuit in the air or other substance being cooled or heated, examples include;

Answer 9

chilled water air conditioning systems or skating and curling rinks

Question 10

Indirect System skating and curling rink characteristics:

Skating rink temps:
Hockey: 19-__F
Skating: 24-__F

Curling rinks: __F

Answer 10

19-22F
24-26F

24F

Question 11

Ice rink facts:

1. brine temperature is __F lower than floor material and ice temp
2. Ice temp maintained by ice thermostat or _____ brine temp
3. Max ice thickness?
4. Brine temp drop thru low temp chiller is __F

Answer 11

1. 10F
2. return
3. 1.5’’
4. 2F

Question 12

Humidity effects in ice rinks; name a few

Answer 12

visibility, ice quality, condensation can create issues with steel rusting and wood rotting

Question 13

name a dehumidification method

Answer 13

Ventilation fan

Question 14

what does 100% relativity humidity mean?

Answer 14

the air cannot hold anymore water

Question 15

Purpose of a refrigerated dehumidifier?

Answer 15

Can regulate and set amount of humidity in building

Question 16

A desiccant dehumidifier is comprised of an air handler with a fan section, slowly rotating a desiccant wheel and a gas fired burner section. It sucks in cool wet air out of arena and brings in warm ___ air

Answer 16

dry

Question 17

Name a few benefits of a dehumidifier

Answer 17

1. Improved ice conditions
2. no fogging
3. reduced moisture permeation of facility
4. reduced maintenance costs

Question 18

What is heat reclaim?

Answer 18

using the heat removed from one area and making efficient use of it elsewhere

Question 19

Examples of heat reclaim; name 3

Answer 19

1. under floor heating
2. zamboni water heating
3. swimming pool heating
4. snow melt pit
5. domestic hot water heating

Question 20

Tube within a tube vented double wall heat exchanger has potable water in and gas ___ and hot water out and gas __

Answer 20

out, in

Question 21

Shell and tube heat exchanger provides a low _____ but high quantity of useable heat

Answer 21

quality