This topic contains a solution. Click here to go to the answer

Author Question: Why are schematic diagrams often not true ladder diagrams? What will be an ideal ... (Read 73 times)

beccaep

  • Hero Member
  • *****
  • Posts: 535
Why are schematic diagrams often not true ladder diagrams?
 
  What will be an ideal response?

Question 2

Explain a method used to determine the correct operating discharge pressure of a commercial refrigeration system.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

CharlieArnold

  • Sr. Member
  • ****
  • Posts: 319
Answer to Question 1

Schematics commonly have some part of the diagram arranged to represent a part of the unit. For example, many schematics have the thermostat connections or unit terminal board connections drawn in the schematic in the same order and arrangement as in the unit.

Answer to Question 2

The method used is as follows:
Step 1  Measure the dry-bulb temperature of the air entering the condenser. (We will refer to this as the EAT  Entering Air Temperature).

Step 2  Measure the system's operating suction pressure.

Step 3  Using a Pressure/Temperature (P/T) chart, convert the suction pressure to its equivalent saturation temperature.

Step 4  Determine the system's application: low temperature, medium temperature, or high temperature. A low temperature system is one that operates at an evaporating temperature of 0F and below. A medium temperature system is one that operates at an evaporating temperature of between 0F and 25F. A high temperature system is one that operates at an evaporating temperature of between 25F and 45F.

Step 5  Using the chart below, determine the appropriate Temperature Rise (TR). The TR is the difference between the EAT and the condensing temperature of the refrigerant in the condenser.

Step 6  The Condensing Temperature





 

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

For a complete list of videos, visit our video library