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Questions and Answers
What type of gas is in the tank?
What type of gas is in the tank?
- Helium (correct)
- Ethane (correct)
- Methane (correct)
- Ethane (correct)
In refrigeration, how do you call a heat exchanger in which low-pressure refrigerant boils or vaporizes, thus absorbing heat that was removed from the refrigerated area?
In refrigeration, how do you call a heat exchanger in which low-pressure refrigerant boils or vaporizes, thus absorbing heat that was removed from the refrigerated area?
- Evaporator (correct)
- Chiller
- Flooded Evaporator
- Cooler
What do you call the type of refrigeration system where only part of the circulated refrigerant is evaporated?
What do you call the type of refrigeration system where only part of the circulated refrigerant is evaporated?
- Flooded refrigeration system (correct)
- Absorption refrigeration system
- Vapor-compression refrigeration system
- Vacuum refrigeration system
How do you call the mixtures or substances that are used in laboratory methods of producing a drop in temperature?
How do you call the mixtures or substances that are used in laboratory methods of producing a drop in temperature?
Which of the following is a scale of temperature in which the melting point of ice is taken as 0 degrees and the boiling point of water is 80 degrees?
Which of the following is a scale of temperature in which the melting point of ice is taken as 0 degrees and the boiling point of water is 80 degrees?
What is the amount of heat energy required to raise the temperature of one pound of water one degree Fahrenheit?
What is the amount of heat energy required to raise the temperature of one pound of water one degree Fahrenheit?
What do you call the maximum temperature of any gas or vapor at which it may be condensed into a liquid?
What do you call the maximum temperature of any gas or vapor at which it may be condensed into a liquid?
What is any refrigerant that exists as a liquid under normal atmospheric pressure and temperature that must be vaporized in an evaporator under a pressure below atmospheric?
What is any refrigerant that exists as a liquid under normal atmospheric pressure and temperature that must be vaporized in an evaporator under a pressure below atmospheric?
What do you call the group of refrigerants developed since about 1925 to overcome the limitations or toxic effects of earlier refrigerants?
What do you call the group of refrigerants developed since about 1925 to overcome the limitations or toxic effects of earlier refrigerants?
What is the refrigeration system component that combines the functions of a cooling tower and a condenser?
What is the refrigeration system component that combines the functions of a cooling tower and a condenser?
What refers to a factor used in calculating the overall heat transfer through the tube walls of a condenser tube?
What refers to a factor used in calculating the overall heat transfer through the tube walls of a condenser tube?
How do you call the type of evaporator arranged with a tank or single drum located above the coil?
How do you call the type of evaporator arranged with a tank or single drum located above the coil?
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Study Notes
Gas Properties and Types
- Two kilograms of gas has a volume of 1 m³, pressure of 200 kPa, and temperature of 8°C.
- Possible gas types listed: Helium, Ethane, Methane, Ethane.
Refrigeration Components
- An evaporator is a heat exchanger where low-pressure refrigerant boils and absorbs heat from the refrigerating area.
- A chiller is related but typically refers to a unit that cools and circulates fluids.
- Flooded refrigeration systems partially evaporate the refrigerant and recirculate the remainder.
Refrigeration Techniques
- Frigorific mixtures are used to produce low temperatures; a common example includes ice and salt.
- The Reaumur Scale measures temperature where ice melts at 0°C and water boils at 80°C.
Heat Transfer Concepts
- Specific heat indicates the amount of energy needed to raise the temperature of a pound of water by one degree Fahrenheit.
- A British thermal unit (BTU) is defined as the heat required to raise the temperature of one pound of water from 32°F to 212°F.
Gas Behavior and States
- Critical temperature is the maximum temperature for vapor condensation into a liquid, regardless of applied pressure.
- Saturation temperature refers to the boiling point at which a substance transitions from liquid to vapor.
Refrigerant Properties
- Halogenated refrigerants, developed since the 1920s, offer safer alternatives to toxic refrigerants like ammonia.
- Freon refrigerants were specifically designed to address the high pressure issues of carbon dioxide used historically.
Refrigeration System Components
- An evaporative condenser combines cooling tower and condenser functions within a single unit.
- Fouling factor accounts for heat transfer rate degradation due to dirt buildup on the interior surfaces of tubing.
Evaporator Types
- A flooded evaporator is configured to be filled completely with refrigerant, typically arranged with a tank or drum situated above the coil.
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