Chapter 118- Refrigeratin Control Cycles

Question 1

The operation of a start stop compressor is usually controlled by what kind of actuators

Answer 1

Pressure
Humidity
Temperature

Question 2

How does a temperature actuated control valve work

Answer 2

Movement of a bimetallic element
Expansion of a fluid
Vapour pressure elf a volatile fluid
Electrical resistance
Electronic signals

Question 3

How does a pressure actuated control work

Answer 3

Temperature always corresponds with pressure, by measuring the pressure a person can find the corresponding temperature of a refrigerant and use this information to regulate his equipment

Question 4

How does a humidity actuated control work?

Answer 4

It consists of a hygroscopic element, which grows or shrinks depending on the current humidity, this affects an on off control in your valve

Question 5

Refrigerant flow control valve

Answer 5

Controls the amount of refrigerant flowing into the evaporator

Question 6

Many refrigerating units use air or water for cooling

Answer 6

Water

Question 7

What does a condenser water regulating valve do

Answer 7

Regulates the flow of Cooling water to the condenser

Question 8

How does a condenser cooling water regulating valve work

Answer 8

A set of bellows connected by tubing is connected to the high pressure side of the system. When heat absorbed equals heat gained the flow remains constant but during load change the pressure on the system will move the bellows changing the rate of flow