Don Kim

[Don Kim]

Hello Susan,

Thank you for the wonderful advise. I was introduced to an appliance parts distributor, Marcone from an appliantology member. I am going to give them a call a next week. Dey distribution was not in my local area.

[Don Kim]

Thank you so much for your clear explanation for bubble point vs. dew point in Dan Foss App. I was quite worried how I was going to remember which is for subcooling and which one is for subcooling. Now since I understand now how to utilize P-T portion of the P-H chart when it comes to figuring out subcooling and superheat, I don’t have to make it a guessing game for me anymore.

The P-H chart for R134 shows the bubble point and dew points are the same. P-H charts for zeotropic refrigerant like r407c and r404 bubble point where the liquid refrigerant starts to boil is different than dew point where vapor refrigerant starts to condense. But I like your explanation better since it really pertains to what’s really going on inside the evaporator.

Now I see that P-H chart is really good way to see what is happening in various part of the sealed system. For instance, I had hard time comprehending what makes that big sudden drop between subcooling region and saturated region in terms of temperature. But after realizing this is what happens in between the expansion valve and starting point of the evaporator, this pattern in the P-H chart was made clear.

Also thank you for clarifying for my 1st question regarding the superheat value discrepancy. I want to make sure that I am on the right footing when it comes to understanding refrigeration thermodynamics.

[Don Kim]

Thank you Sam clarifying this for me.

Don.

[Don Kim]

I see now how this is a part of auto dry mode. When the outlet temperature is higher than bimetal opening temperature the, bimetal will open and timer will advance. However if the outlet temperature is lower than bimetal opening temperature, the outlet bimetal will close and energize the inner heating element and at the same time shunt the timer circuit which will pause the timer from advancing.

Thank you for your reply.

[Don Kim]

Thank you Samurai Master Sam.

[Don Kim]

Thanks for clarifying.

[Don Kim]

OK, thanks.

[Don Kim]

Overly Long Dry Times.

Got it finally. Will probably never forget this one.

Thanks.

[Don Kim]

Thanks, I am looking forward to it.

[Don Kim]

The two possible paths for L1 to get to the LF indictor light are:

[answer hidden]

As for the bimetal switches I have in question in terms of the symbolic confusion are those four temperature controls switches in parallel arrangement on left side of ganged indicator lights for elements.

Also it is mentioned in the quiz that these bimetal switches are internal to each surface heating element? So this means that it is not anyway part of the Protector which is drawn between surface element and H2 of infinite switch. I just want to eliminate any confusion this may cause in my understanding of the circuit.

Thanks.

[Don Kim]

Thank you for your advice.

[Don Kim]

Susan,

I retook the quiz as advised.

[Don Kim]

Thank you Susan.

Is it possible to use different email addresses for samurai and Appliantology.

Don.

[Don Kim]

This is very interesting point. I remember during the beginning of my HVAC training, the term split was taught for Evaporator side. Also later in the commercial/ chiller course the term approach, delta, and heat exchangers were discussed.

Well for now, I am more likely to be in the direct refrigeration side instead of industrial chiller refrigeration, so the split seems make sense. But if I ever get into refrigeration involving chillers, the term approach and delta would become more convenient.

[Don Kim]

This is very interesting point. I remember during the beginning of my HVAC training, the term split was taught for Evaporator side. Also later in the commercial/ chiller course the term approach, delta, and heat exchangers were discussed.

Well for now, I am more likely to be in the direct refrigeration side instead of industrial chiller refrigeration, so the split seems make sense. But if I ever get into refrigeration involving chillers, the term approach and delay would become more convenient.

[Author]

Posts