Science: Cooling Down by Evaporating

Cooling Down by Evaporating

Written by Thomas Yoon

Evaporator coils of air conditioning systems are sometimes called cooling coils. But cooling coils are also used in air-handling units. These contain chilled water. These are completely different from those used in direct expansion air cond units.

So cooling coils is not an accurate word to use in small air cond units. Evaporator coils should be used instead. Evaporator tubes must contain refrigerant liquid that can evaporate to become gas.

In an air conditioning system, when repparttar liquid refrigerant absorbs heat, it turns to gas. The heat is thus transfered to repparttar 127644 refrigerant. That's how repparttar 127645 heat is moved from one location to another location.

The evaporator coils are located in repparttar 127646 low-pressure system of a refrigeration circuit.

A word of caution!

Expansion for Heat Absorption

Written by Thomas Yoon

In repparttar

refrigeration cycle, repparttar 127643

refrigerant must undergo a change in state in order for repparttar 127644

heat to be absorbed from repparttar 127645

environment.

The refrigerant has repparttar 127646 property of changing its state from liquid to vapor at normal room temperatures.

Have you ever felt your skin becoming cool whenever you put alcohol on it? Or even when a bit of petrol spilled onto your hands? It's because, repparttar 127647 alcohol or petrol has evaporated when it comes in contact with your skin.

The result - heat is removed from your skin, and it feels cool!

In a closed-loop refrigeration circuit, repparttar 127648 change of state from liquid to vapor is achieved mechanically by pressurizing repparttar 127649 liquid at one end and forcing it through a small opening at another end.

Once repparttar 127650 liquid comes out from repparttar 127651 small opening, it expands into vapor. The effect is similar to repparttar 127652 spray you get when you restrict repparttar 127653 outlet of your garden hose. But water is not a refrigerant. It does not feel cold because it does not change to a vapor.

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