Absorption Systems: Exam 2

Question 1

Absorption systems: Types; Ammonia Absorption

• 1. uses ammonia as the ________ and water as the absorbent/hydrogen
     
     2. Is not used in ________ building applications due to the quantities of the ammonia gas
     3. used where hazards to the public is very _____

Answer 1

1. refrigerant
2. commercial
3. small

Question 2

Absorption Systems: Types; Lithium Bromide Absorption

1. Uses lithium bromide/_____
2. is commonly used for ______ water systems in commercial and industrial applications

Answer 2

1. water

2. chilled

Question 3

Absorption Systems: Major components:

1.
2.
3.
4.
5.

Answer 3

1. absorber
2. condenser
3. evaporator
4. generator or concentrator
5. pumps

Question 4

Absorption Systems: Major liquids used;

**1. Water is used as the refrigerant and is located within the _______

2. ** Lithium Bromide is used as the absorbent for water vapour found in the _______

Answer 4

1. evaporator

2. absorber

Question 5

Absorption System: Terminology;

1. Absorbent: Is a ______ that has the ability to absorb large amounts of water vapour (lithium bromid)
2. Absorber: component where the water vapour is absorbed by the ________

Answer 5

1. liquid

2. absorbent

Question 6

Absorption Systems: Terminology;

1. Condenser: component used to condense the vapour returning from the ________
2. Generator: component used to ____ off the water vapour from the absorbent
3. Evaporator: component used to ______ heat from the chilled water circuit

Answer 6

1. generator
2. boil
3. absorb

Question 7

Absorption Systems: Terminology;

1. Strong bromide solution: a solution of lithium bromide and ______ which has a relatively ___ concentration of water vapour. It is the solution that leaves the generator back to the _______

Answer 7

1. water, LOW, absorber

Question 8

Absorption Systems: Terminology;

1. Weak bromide solution: a solution of lithium bromide and water (which ha a relatively ____ concentration of water vapour). This is the solution that leaves the absorber and enters the _________

Answer 8

1. HIGH, generator

Question 9

• Absorption systems: Terminology; Solution pumps;
  1. Used to circulate system _____
  2. located between absorber and _________
  3. circuits water within the

Answer 9

1. fluids
2. generator
3. evaporator

Question 10

Absorption Systems: Terminology;

1. High side: contains the condenser/generator and pressure is ____psia
2. Low side: contains the evaporator/absorber and pressure is ___psia

Answer 10

1. 1.47psia

2. 0.12psia

Question 11

Absorption Systems: Terminology; Heat exchanger;

1. Used to _____ strong solution from generator before entering the absorber and heats up weak solution fro absorber before entering generator.

Answer 11

cool

Question 12

***Absorption Systems: Terminology; Crystallization

1. ___ crystals will precipitate out of the solution
2. This normally happens with-in the ____ _______ because the strong bromide solution has been dropped below ___F @65% concentration

Answer 12

1. salt

2. heat exchanger, 110F

Question 13

***Causes of Crystallization

1. Air and non-condensables leaking into the ______
2. Cooling water that is too cold or ________ in temperature too rapidly
3. Electric power ______

Answer 13

1. chiller
2. fluctuates
3. failure

Question 14

Air leaking into the chiller:

1. Increases evaporator ________ and _______
2. decreases chiller _______
3. increases heat _____

Answer 14

1. pressure and temperature
2. capacity
3. input

Question 15

Absorption Systems: Purge Units; T or F?

1. The accumulation of air and other non-condensable gases undermines the efficiency and reliability or absorption chiller. Since absorption chillers operate below atmospheric pressure, regulator operation of a purge system is required to remove, or “purge”, the air and other non-condensables that may leak into the chiller

Answer 15

True

Question 16

Absorption Systems: Purge Unit;

1. Methods of removal: mechanical _______ pump or a non-mechanical continuous purge unit
2. Location: installed in the absorber lowest ________ component

Answer 16

1. vacuum

2. pressure