Chap 47
Per FDA requirements, food storage equipment should maintain food temperature at or below what temp?
What is 41F
TorF/ The cooling capacity of a modulating refrigeration system is adjusted by turning the system on or off
What is False?
Heat leakage into a refrigerated cabinet will decrease as the cabinet wall thickness what?
What is increases?
A component in a refrigeration system that receives hot, high-pressure refrigerant vapor from the compressor and cools the gaseous refrigerant until it condenses back to its liquid state.
What is a condenser?
What is the process of adding pressure to the high side slowly to bring unit out of a vacuum called?
What is atmospheric Pressure?
A primary benefit of minimizing the distance between the separate parts of a commercial refrigeration system is a significant reduction of what?
What is refrigerant charge?
What type of circuit is often added to a system using a hot-gas bypass as a form of capacity control?
What is a Desuperheating circuit?
What measurement takes into account the insulation value of boundary films?
What is the U-value?
A process of fast-freezing using liquid nitrogen or carbon dioxide to turn perishable fresh food into long-lasting frozen food.
What is cryogenic food freezing?
Which side of my manifold should I open when pulling a vacuum on a refrigeration system?
What is both sides?
What is commonly used on refrigerated cabinets to prevent condensation from forming?
What is resistance heat strips?
A multistage system has more than one stage of what?
What is compression?
The refrigerant that immediately vaporizes as it passes through the metering device is referred to as what?
What is Flash Gas?
A commercial refrigeration system that cools and freezes a large amount of cooked hot food rapidly and uniformly. Also called shock freezer.
What is a blast freezer?
How do you know when your done recovering?
What is both at zero PSI?
What does food freezers use to warn that the temperature has reached above an upper safe limit?
What is a temperature alarm system?
TorF/A refrigeration system's cooling capacity can be modulated by varying the speed of the compressor motor.
What is true?
Part of the service heat load includes removing what kind of heat from fresh vegetables and meat?
What is respiration heat?
An arrangement of compressors piped in parallel with a common suction line, a common liquid line, and a common liquid receiver. These are commonly used in multiple-compressor systems and provide a variable cooling capacity based on demand.
What is parallel compressor rack?
How do you know when you're done vacumming?
What is 29.99 in or 500 microns?
In commercial refrigeration, an air curtain is used to do what?
what is isolate a conditioned space?
What is the purpose of an intercooler in a compound refrigeration system?
What is to desuperheat refrigerant?
The total amount of heat that leaks through the walls, windows, ceiling, and floor of the cabinet per unit of time describes the what?
What is the heat leakage load?
A storage tank in the suction line that collects liquid refrigerant from the evaporator and suction line and prevents it from flowing further along the suction line before vaporizing.
What is an accumulator?
When is the only time the unit should be plugged in?
What is recharging?
Since the cooling demand is irregular for water coolers, they must have a(n) what?
What is a hold-over capacity?
Leaks in secondary loop refrigeration sytems are easy to detect because the fluid is what?
What is dyed?
A commercial system's total heat load represents the amount of heat that a system must remove in a what hour period?
What is 24 hour period?
A vapor pump that draws low-pressure refrigerant vapor from the evaporator and squeezes or compresses it to a high-temperature and high-pressure vapor and into the high side of the system.
What is a compressor?
Where is the yellow hose from my manifold connected at when recovering refrigerant from a unit?
What is the in on recovery machine?