Refrigeration, Heat Pumps, and Refrigerants

These flashcards cover key terms related to refrigeration, heat pumps, and refrigerants as discussed in the lecture.

Heat Pump

A device that transfers heat energy from a source to a sink using work.

Coefficient of Performance (COP)

A ratio that measures the efficiency of a heat pump, defined as the ratio of heating or cooling provided to the work required.

Refrigerant

A substance used in a heat pump that undergoes phase changes to absorb and release heat.

Frosting Problems

Issues that arise when frost accumulates on evaporator coils, reducing heat transfer efficiency.

Thermodynamics

The branch of physical science that deals with the relationships between heat and other forms of energy.

Ground Source Heat Pump

A heat pump that uses the earth or groundwater as a heat source or sink.

Low-Grade Heat

Heat energy that is at a low temperature, which must be elevated for practical heating purposes.

Air Source Heat Pump

A type of heat pump that extracts heat from the ambient air.

Combined Heating/Cooling System

A system that can reverse its function to provide both heating and cooling.

Energy Efficiency

A measure of how effectively energy is transformed into a useful output.

Ideal Refrigerant Properties

Characteristics that allow refrigerants to efficiently absorb and release heat at specific temperature differences.

Chlorofluorocarbons (CFCs)

A group of chemicals previously used as refrigerants, now regulated due to their ozone-depleting effects.

Hydrofluorocarbons (HFCs)

A replacement for CFCs that do not deplete the ozone layer but have other environmental concerns.

Absorption Refrigeration Cycle

A refrigeration cycle that uses a heat source to drive the cooling process by absorbing and re-releasing heat.