In a basic vapour-compression refrigeration cycle, which component absorbs heat from the space or product being cooled?
Refrigeration Cycle Ph Diagrams
Question · Easy
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What are the four main components of the basic vapour-compression refrigeration cycle?
Refrigeration Cycle & p-h Diagrams
Flashcard
Which of the four main refrigeration components raises the pressure and temperature of the refrigerant vapour?
Refrigerant family whose GB market supply is capped in 2030 at 21% of the 2015 to 2019 average.
Refrigerants
Guess the Term
Chapter 1: The Refrigeration Cycle & p-h Diagrams
1.1 Thermodynamics: Sensible/Latent Heat & Pressure-Temperature Relationship
Study guide
Cheat sheet
What happens to the refrigerant as it passes through the expansion (throttling) device?
Question · Medium
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What happens to refrigerant inside the evaporator?
On a pressure-enthalpy (p-h) diagram, the throttling process through the expansion valve is represented by which type of line?
Refrigerant made from two or more single gases, such as R-404A or R-410A.
What is meant by 'superheat' in a refrigeration system?
What is the compressor's role in the refrigeration cycle?
What does 'sub-cooling' describe in the refrigeration cycle?
Describes unused refrigerant that, if its warming value is 2,500 or more, may not be used to service refrigeration equipment of 40 tonnes CO2 equivalent or more.
1.2 The Vapour-Compression Cycle & The Four Main Components
In the evaporator, refrigerant absorbs heat mainly by which mechanism?
Read the clue and guess the term in 6 tries.
Game
What happens to refrigerant in the condenser?
Which statement about the condenser in a vapour-compression system is correct?
Gaseous refrigerant leaving the evaporator before the compressor raises its pressure.
Refrigeration cycle
On a p-h diagram, the area inside the curved 'saturation dome' represents refrigerant that is in which state?
Question · Hard
What happens to refrigerant pressure and temperature across the expansion device?
Why must liquid refrigerant be prevented from returning to the compressor suction?
Efficiency ratio of heating capacity to effective power input, measured in delivered electricity.
1.3 Superheat, Sub-cooling, & COP (Coefficient of Performance)
Which component is fitted to control refrigerant superheat by modulating flow into the evaporator?
System Components
Swap tiles to line up three of the same term.
Term Match
Define 'superheat'.
What is the primary purpose of a filter drier in a refrigeration circuit?
Climate multiplier that converts a gas's mass into carbon dioxide equivalent; sulphur hexafluoride is listed at 22,800.
Global warming
Bubbles seen continuously in the liquid-line sight glass during steady running most commonly indicate what?
Define 'sub-cooling'.
What is the function of a liquid receiver in a refrigeration system?
Metric mass unit used for a system's carbon dioxide equivalent, with the first leak-check threshold set at 5.
Chapter 2: Refrigerants & Environmental Impact
2.1 Refrigerant Classification
When brazing pipework that will form part of a refrigerant circuit, why is dry oxygen-free nitrogen (OFN) purged through the pipe?
Safety Legislation
Flip two cards at a time to find matching terms.
Term Pairs
On a pressure-enthalpy (p-h) diagram, what does the area inside the saturation dome represent?
Under the F-Gas Regulation (517/2014) as it applies in Great Britain, how is the charge size threshold that determines leak-check frequency expressed?
Refrigerants Fgas Ods Regulations
Annual allocation that caps how much HFC a producer or importer may place on the GB market.
HFC phase-down
How is the CO2 equivalent of a refrigerant charge calculated?
Why must liquid refrigerant never return to the compressor suction?
For stationary equipment containing 5 tonnes or more (but less than 50 tonnes) of CO2 equivalent without a fixed leak-detection system, how often must a leak check be carried out?
Leak Detection Repair
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