OK, I'm still sick, but getting better.
Phase change questions:
From meck:
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enjoyed article very much just had a small prob with useing a capalary tube ? expansion valve ( suction throttling valve) or fixed orfice tube. capalary is part of above valves sensor . or what did i miss
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To be honest, I'm having difficulty understanding the question. So, I'll just go over the purpose of the capillary tube and TEV.
The capillary tube performs the same function as a thermal expansion valve: restriction/metering. By restricting flow, it allows a pressure differential (the compressor is pushing on one side of the restriction to create high pressure, and is sucking on the other side, creating low pressure). By metering, I mean that only the right amount of refrigerant should be allowed into the evaporator. Too much, and you run the risk of sending liquid refrigerant back to the compressor. Too little and you are not cooling as well as possible.
The advantage of a thermal expansion valve is that it optimally adjusts according to the current situation. As the evaporator temp rises, it allows more refrigerant to flow into the evaporator, and vice versa. It does this by monitoring the superheat temperature (the temperature of the gaseous refrigerant coming from the evaporator). The advantage of a capillary tube is cost.
I hope that answers your question.
From Marco:
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I think you are missing one component in discussing your phase-change system, the compressor. I understand that the article is about making the process as simple as possible to understand, but still this description presents a rather inaccurate picture.
You could try using an analogy where you compare the coolant to a sponge. In the compressor you "squeeze" the heat out of the spone, the condenser "dries up" this heat, allowing the coolant to "soak in" the heat from the heat source.
Haha. Reading on I see that Brian uses exactly this analogy
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Do you mean that I did cover compressors enough or not? It looks as though you started to comment before reading the article all the way through. I hope that I did cover it well enough; let me know if you do have some questions. As for the sponge metaphor, it just seems natural, doesn't it? Glad you liked it!
Also, your proofreading needs some work. You missed at least two grammar errors in my portion, and (I think) two spelling errors in Joe's portion.
