I love your videos man, as an experienced service technician, I find myself binge watching some of these videos. The way you explain it is great! Makes learning about the topics interesting and I’m able to grab the facts easier!
The excitement you have for this makes me excited. I wish more creators in the hvac industry had this passion rather than the "it's beer can cold method". I love this man, keep it up.
That is something that I didn't know and I am very grateful that you taught this. It really does make a little more sense to me. The refrigerant cycle is making more sense to me know. The change of state is where all the magic is.
haha when you started asking about the latent heat btus needed to change state i was remembering when I first learned this stuff a few years back thinking to myself "isnt it like 900-something btus?" from back when I actually did the calculations for the tests. glad to know i still remember it somewhat lol.
Hi Ty, Does latent and sensible heat apply to the refrigerant in the systems or just in a space that is heated/cooled? And how is latent heat measured? Would love a diagram of where latent and sensible heat both take place in a system. Thank you HVAC god!
The point is to understand the that latent is more powerful. Later we will use a refrigerant changing state, each refrigerant will absorb a different BTU when changing state but it will be hundreds more times powerful than just a change in temperature.
So is this why dehumidifiers put out so much more heat than their wattage would suggest? because they are releasing the btu's stored in the water vapor/condensate back into the room?
Yes, yes, not only the heat of the watts from the fan motor and compressor but latent heat that was hidden in the water vapor. At room temperature there is over 1000 BTU removed for water to change state from a vapor to a liquid
@@love2hvac So I could calculate this heat load by figuring the btu's in a pint of condensate and then multiplying that by the # of pints a dehumidifier is rated for?
If it is -20 outside, and you are maintaining 70f in two identical containers, but one is 60% RH and the other is 30% Do both require the same ongoing energy to maintain the heated space? And if moisture is condensing on the walls, and being replenished from the floor back into the air?
If both containers are sealed the humidity inside would have no effect on the heat transfer. The heat transfer or insulating value of the container will play a very big part of the heat loss. If you are talking about a house then you have many factors affecting it. One of the biggest being the air leakage and that will greatly affect the humidity inside. Insulation, windows, wind will all play a part in that.
How much heat is required to convert a one pound block of 32deg ice to steam under atmospheric pressure? 144 btu 1lb ice to 1lb ice water 180 btu(sensible heat)32 deg to 212 deg 970 btu(laten heat) 212 deg to 212 deg. Do you have to add all btu processes example: 144 btu+180 btu+970 btu = 1294 btu or is it simply 970 btu Thank you!
My friend Craig has a great book and channel ac service tech llc www.amazon.com/dp/1733817204/ref=cm_sw_r_cp_apa_glt_fabc_PG0S56V6WXSGA0YYME49 For an in depth approach I like this one (newer version is available) www.amazon.com/dp/1111644470/ref=cm_sw_r_cp_apa_glt_fabc_61M3N6AFHMHPDMXJRRJW And (newer version is avilable) www.amazon.com/dp/0134016165/ref=cm_sw_r_cp_apa_glt_fabc_P1F2483EY3Q2S90N766F
I actually wrote a book, a school I worked for used it edited it, made a bunch of promises they never kept, I left and then they claimed it as their own! 😡
A change of state inside a refrigerant coil is not dependent on a change of state outside the coil(air side). The refrigerant only needs btu's it doesn't care about the senible vs latent load in the airflow across the coil? Is this correct?
To make 1 pound of water change state from a vapor to a liquid, approximately 1000BTU of heat energy needs to be removed from the water. That energy has to be accounted for, so it goes into the refrigerant that is changing state from a liquid to a vapor absorbing it. This is why ACCA manual S is so important as it accounts for laten and sensible load to select the proper equipment
Sensible load is changing the temperature of the air. Latent load is what dehumidify the air. Refrigerant boiling is latent cooling/absorbing heat. Both sensible and latent loads of the air are absorbed into the refrigerant changing state.
So in vacuum we need 970 BTUs to change the state of water to vapor is that correct? And is the temperature when water start to boil under vacuum (water in the system). Thanks.🌴
970 btu per every pound of water. (*technically the btu will varry with temperature and pressure) Here is a temperature pressure chart for water boiling in a vacuum. www.engineersedge.com/h2o_boil_pressure.htm
If I had a nickel for every time he said "970" (BTUs of heat energy)... ...I'd have $1.05. Which isn't a lot, but it's weird that it happened 21 times.
