Refrigeration Systems Quiz

The difference between the average air temperature and the average chilled water temperature in a cooling coil.

The temperature at which the refrigerant boils inside the evaporator.

The temperature at which the refrigerant condenses inside the condenser.

The pressure inside the evaporator when refrigerant is boiling at 0°C.

The pressure inside the condenser when refrigerant is condensing at 30°C.

Properties of a refrigerant like saturation temperatures, pressures, volume, density, and enthalpy.

Tables containing thermodynamic properties of refrigerants at various saturation temperatures.

Using refrigerant tables to calculate the performance of a refrigeration system.

A system used by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to identify refrigerants. It uses the letter 'R' followed by a number, such as R-134a, to represent a specific refrigerant.

Physical properties that affect how heat moves, including pressure, temperature, volume, density, enthalpy, and entropy.

The temperature at which a substance changes from a liquid to a gas at atmospheric pressure.

Refrigerants with properties that make them suitable for specific applications, but no single refrigerant is ideal for all purposes.

Conditions used for comparing refrigerant properties, typically including an evaporator temperature of -15°C and a condenser temperature of +30°C.

The amount of heat required to freeze 1 tonne of pure water at 0°C into ice at 0°C over a 24-hour period.

335,000 kJ/day or 13,958 kJ/hour.

Refrigerants are categorized into various classifications based on criteria like flammability, toxicity, environmental impact, and operating temperature suitability.

A refrigerant's flammability refers to its tendency to combust or ignite in the presence of an ignition source.

A refrigerant's toxicity refers to its potential to cause harm to humans and other living organisms.

Refrigerants are classified based on their impact on the environment, such as their ozone-depleting potential (ODP) and global warming potential (GWP).

Refrigerants are categorized by their origin, whether they are natural, synthetic, or blends of both.

Refrigerants are also classified based on their suitability for specific operating temperatures, such as low, medium, or high temperature applications.

A device that increases the pressure and temperature of refrigerant vapor in a refrigeration system.

The process of increasing the pressure and temperature of refrigerant vapor.

The component in a refrigeration system where heat is absorbed from the environment to be cooled, often using an evaporator fan.

The component in a refrigeration system where heated refrigerant vapor releases heat to a cooling medium, like air or water.

A device that controls the flow of refrigerant into the evaporator, influencing the system's cooling capacity.

A system that uses the vaporization and condensation of a refrigerant to transfer heat from a low-temperature region to a higher-temperature region.

The pressures and temperatures within a refrigeration system are determined by the desired cooling temperature of the system.

The process of selecting the appropriate refrigerant and setting the operating pressures and temperatures for a specific refrigeration system based on cooling requirements.

The process where a working fluid like refrigerant absorbs heat from a low-temperature source (evaporator) and releases it to a high-temperature source (condenser) to achieve cooling.

A measure of how efficiently a refrigeration system converts energy into cooling. It compares the cooling effect to the energy input.

The ratio of the condenser pressure to the evaporator pressure in a refrigeration system. It indicates the pressure difference driving the refrigerant flow.

A substance used to transfer heat in refrigeration systems. It absorbs heat during vaporization and releases heat during condensation.

The ability of a refrigerant to mix with lubricating oil.

Refrigerants that mix with oil, preventing oil buildup in the system.

Refrigerants that do not mix with oil, leading to oil accumulation in the system.

A device that separates oil from the refrigerant in a refrigeration system.

A system that returns separated oil back to the compressor.

The strong smell of ammonia can trigger panic in crowded areas.

The characteristic odor of halocarbon refrigerants, which can help detect leaks quickly.

Flammable refrigerants, like propane, are typically restricted to industrial settings.