Expansion for Heat Absorption

Written by Thomas Yoon

Inrepparttar refrigeration cycle,repparttar 127643 refrigerant must undergo a change in state in order forrepparttar 127644 heat to be absorbed fromrepparttar 127645 environment.

The refrigerant hasrepparttar 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 pressurizingrepparttar 127649 liquid at one end and forcing it through a small opening at another end.

Oncerepparttar 127650 liquid comes out fromrepparttar 127651 small opening, it expands into vapor. The effect is similar torepparttar 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.

Explosive Air

Written by Thomas Yoon

Have you considered your air compressor as a potential bomb?

If you have not, then you better!

Although air compressors are built to withstand high pressures, and will have allrepparttar necessary relief valves to take care of normal occurring overpressures, explosion involving fire propagation is another matter.

How can a fire occur in an air compressor?

In order to understandrepparttar 127642 phenomenon of explosion, we have to understandrepparttar 127643 nature of fire, because, after all, an explosion is a very rapid propagation of fire.

A fire will only start whenever three conditions are met - fuel, oxygen and heat.

An air compressor when operating will have a very rich supply of oxygen already in place - pressurized oxygen.

Where do we getrepparttar 127644 fuel?

If you use oil lubricated air compressors,repparttar 127645 lubricating oil can becomerepparttar 127646 source of fuel. It can also be inrepparttar 127647 form of carbon dust. Carbon is formed when oil is heated to high temperatures.

How is it possible to have high temperatures to igniterepparttar 127648 combustible mixture?

There can be a lot of reasons - lack of lubrication due to oil deterioration, reduced lubricating quality ofrepparttar 127649 oil, oil pump mechanism fault, oil filter choked, worn out parts leading to lessen oil pressures, etc. Whenever there is a hotspot sufficient to igniterepparttar 127650 combustible mixture an explosion will occur. That isrepparttar 127651 extreme case.

Let's see what can happen that can lead to that extreme case of an explosion.

Allrepparttar 127652 above reasons for lubrication failure or deterioration will gradually causerepparttar 127653 machine to operate poorly, wear outrepparttar 127654 moving parts, cause oil spills and carry over ofrepparttar 127655 oil inrepparttar 127656 air passages and increased heat built-up.

Now comesrepparttar 127657 cooling part. Is there a lack of cooling? Ifrepparttar 127658 high temperatures due to rubbing of parts fromrepparttar 127659 above are not cooled down sufficiently,repparttar 127660 heat will build up. The intercoolers play a very important role in removingrepparttar 127661 heat?

There are also many other reasons forrepparttar 127662 lack of cooling.

Whenrepparttar 127663 heat transfer surfaces have been coated by films of scale or carbon it will definitely affectrepparttar 127664 cooling process. The heating surfaces may have been reduced due to choked passages forrepparttar 127665 cooling medium inrepparttar 127666 heat exchanger. The cooling medium itself may be too hot probably due to a fault in another machine likerepparttar 127667 cooling tower whererepparttar 127668 heat can be taken away torepparttar 127669 atmosphere.

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