HVAC 2 Flashcards
The hot side contains:
The _______ side contains the compressor, condenser and another fan to vent hot air coming off the compressed refrigerant to the outdoors.
The cold side of an air conditioner contains:
the evaporator and a fan that blows air over the chilled coils and into the room.
In between the sets of hot and cold coils, there’s:
an expansion valve. It regulates the amount of compressed liquid refrigerant moving into the evaporator. Once in the evaporator, the refrigerant experiences a pressure drop, expands and changes back into a gas.
The compressor is:
actually a large electric pump that pressurizes the refrigerant gas as part of the process of turning it back into a liquid.
When you get into larger air-conditioning applications ( bigger than a window unit), its time to start looking at
split-system units. A split-system air conditioner splits the hot side from the cold side of the system.
In a split system, the cold side, consisting of the expansion valve and the cold coil, is generally placed into a:
furnace or some other air handler. The air handler blows air through the coil and routes the air throughout the building using a series of ducts. The hot side, known as the condensing unit, lives outside the building.
The hot side ( compressor), consists of
a long, spiral coil shaped like a cylinder. Inside the coil is a fan, to blow air through the coil, along with a weather-resistant compressor and some control logic. This approach has evolved over the years because it’s low-cost, and also because it normally results in reduced noise inside the house (at the expense of increased noise outside the house).
Most air conditioners have their capacity rated in
British thermal units (Btu).
A Btu is
the amount of heat necessary to raise the temperature of 1 pound (0.45 kilograms) of water one degree Fahrenheit (0.56 degrees Celsius).
One Btu equals
1,055 joules.
In heating and cooling terms, one ton equals
12,000 Btu.
