This is another class from the 2023 Hvcr Symposium here in lovely Claremont Florida at the Kalos offices. My friend Eugene Silberstein with Esco does a really great presentation on Pressure Enthalpy without Tears. You may have seen a prior podcasts that we did together and a lot of other work in this space, but this is a great class. It's it's summarized so it's really even at an hour long or just under an hour long.

It's still a very quick hit on this topic, but it does give the presentation where you can kind of see all the information all in one place. This is a much longer like I said course that that Eugene gives and then he also has a book that is by the same title Pressure Enthalpy without Tears that you can get through. Esco Definitely a book that I recommend that you get but this is a great introduction. Eugene is an amazing presenter.

Big thanks to him and big thanks to everybody who helped sponsor our event, especially Measure Quick and Akka who are our title sponsors I Know you're going to enjoy this my friend. Eugene Silverstein Thank you. For those of you who don't know me, my name is Eugene Silberstein I've been in this industry for for over 40 years. I Am presently the Director of Technical Education and Standards at the Esco Institute So chances are if you have an EPA card in your pocket, it came from us so we certify technicians, we credential instructors or credit programs.

But yeah, so I was given the great opportunity over the years to author a co-author over a dozen textbooks on HVAC and there were two topics, two subjects that I'm really, really passionate about, one of them being psychometrics, the air side of the world and one being pressure enthalpy. And a lot of times when we get taught pressure enthalpy either in school or through any other source, it's it can get a little intimidating. So I was encouraged to write the Pressure Enthalpy without Tears book by the graduating class of 2006 at the college that I was teaching at I had the opportunity to write direct and teach my own program and the students like, well, where is all this stuff published and it wasn't published anywhere It's just somebody's take on the concepts. So the so that's me and the my approach to this is really just to take what we already know, take a concept and just look at it a little differently.

So independent of other individuals I had come up with this this expression, this term, this phrase if we change the way we look at things, the things we look at change and I was researching. I was planning on writing a new book and that was going to be the title of the book and as I was searching, I found out that there were three other individuals who had also coined this very phrase. you might have heard of them: Max Planck Theoretical Physicist Albert Einstein Theoretical physicist and Dr Wayne Dyer he is a self-help Guru motivational speaker so I I gave credit to all of them. but I listed myself first and the reason I did that was because Planck Einstein and Dyer are all dead so they're very unlikely to complain about the order in which I listed us.

but we're among friends. so I decided to uh to put myself first. So when we think about pressure enthalpy and I want to dive in because what we're going to do today is take a a unique perspective. Oh, look, most of the times when I teach classes on pressure enthalpy I'm very heavy on the physics, the formulas, the math, the numbers, the calculations, and I kind of figured if I did that today and being that the chairs are not secured to the floor, they would probably become projectiles at some point in the afternoon.

So for those of you who are expecting numbers in math and formulas and and all that crazy stuff, I'm not doing that today. so we're taking a step back. When you first look, when you're first learning about pressure enthalpy, your first exposure to it was probably a little intimidating. So having said that, my goal is to allow you and give you the opportunity to look at things a little differently.

So I have a little exercise for all of us real quick and I'm going to give you instructions I'm going to give you a set of instructions and I want you to follow those instructions. Don't ask me any questions, but if you solve it, please don't raise your hand. Please don't shout out because that'll ruin it for everybody else in the room. So here's what I want you to do on the screen.

What are you looking at? You can answer this one a Roman Numeral Roman Numeral Nine. All right now. What I want you to do is you don't have to write this down if you want to write it down on paper. That's great.

If you could think about it in your mind, that's fine too. What I want you to do with that Roman Numeral nine is draw one line and turn that Roman numeral nine into a six. Okay, think about it. if you haven't answered, don't Shout It Out That'll ruin it for everybody else in the room.

Roman Numeral Nine We want you to draw one line and convert. change that Roman numeral nine into a six and I'm going to give you 30 seconds to think about it. normally I give people like a longer time but oh by the way, while you're thinking about that Brian Said that because this is the last session of the afternoon. I Can talk as long as I want so you know if you guys are good till Eight Nine.

I'm cool Anybody, anybody have an answer. All right cool. Don't shout it out anybody having trouble and if you are, it's okay to ask. you know? So here's the deal.

I Started off this afternoon saying if we change the way we look at things, the things we look at change. Think about what I said I gave you a Roman numeral nine I said draw one line, turn that Roman numeral nine into a six. Nobody said what that six had to look like. Nobody said the line had to be straight.

Nobody said it had to be a Roman numeral six. What I said was draw a line, turn the Roman numeral nine into a six. What you heard was take the Roman numeral nine, draw one straight line and turn the Roman numeral nine into a Roman numeral six. Is that what you heard? Chances are right.

So a lot of the problems that we see in the field barriers that stand between us learning something, or barriers that stand between us properly troubleshooting and evaluating a system are not with the system. A lot of those problems. A lot of those barriers that we face come from here. So I just want you to think about that.

So over the next three or four hours because we're here till nine now we said right. I Just want you to look at things a little bit differently. That's all I'm asking you to do when you think of pressure enthalpy. Maybe you're thinking about when you went to school and your teacher started teaching you pressure enthalpy.

Or when you looked up the topic of pressure enthalpy, probably the first thing you saw was that now here is the Silverstein mindset: when I look at something, a chart, a table, and I look at that paper. that sheet and I see more ink on it than white space. I'm running. So imagine sitting in a class and your teacher saying okay, today we're going to learn about pressure enthalpy.

There's only one reaction you're going to run for the Run for the hills. So first of all, what is this thing? Pressure as we charge. It looks cool. It's really, really nice, but of what value is it? So why do we want to plot a system on a pressure enthalpy chart? Well, if you ask me, the number one reason on that list would be because it's fun.

All right. As you're going to see at the end, it's it's really super easy to do. It's not complicated, and there is a sense of satisfaction once you plot this thing out. All right, and it makes really cool shapes.

But in all actuality, what? The pressure enthalpy chart and a completed pressure enthalpy charge for a system, whether it's functioning correctly or not, is to create a singular picture that's representing that entire system. Think about us out in the field. If we want to evaluate airflow, we have to go up into the adequate, to the basement, to the air handler and then we go out to the condensing unit. So we have to go to different places to gather different pieces of information to create this representation of our system.

Pressure enthalpy plot allows you to create a singular picture that represents all components of the system. With that completed chart, you can estimate system efficiency, system capacity. Picture yourself going to somebody's house and they just spent money to buy a 16 seer four-ton system. Is that customer really getting four ton? sixteen seer and you go up to the supply register and you go, oh yeah, that's four tons.

That's like four and a half right there. All right. How do we know? So with a completed pressure enthalpy chart, not only do we create that visual representation of a system, but we can estimate the capacity. What's the output? What's the efficiency of that system? We can even use a completed pressure enthalpy chart to troubleshoot systems.

So a lot of the the smart tools that we have available are based on the concepts of pressure enthalpy charts. So this is the you know, the the, the man behind the curtain. This is the physics behind what we're using out in the field. Today, when I was younger in the field, we used to take all this information on these systems, bring them back to the office, and I would sit and plot these things out on pressure enthalpy charts and we made them part of customer files.

I'm going back into the into the late 80s early 90s long time ago. so it really really gives us a deeper understanding of how these systems function, how our system works. So a lot of us out in the field we know what to do when we see certain things, but understanding why things happen. Why does the system not work well When the air filter gets dirt and you could say oh well, it don't work good right? That's the but what is actually happening in the system right? And filthy gets dirty, less heat being added to the refrigerant.

The suction pressure drops saturation temperature drops Net Refrigeration Effect drops Heat of compression increases Coefficient of performance decreases Eer decreases here, right? All of these fun things. Okay, and we're going to look at that in a in a little bit. So before we before we dive into the chart itself, I Mean here's a list of things that we can actually calculate from a completed pressure enthalpy chart and again, we're going to look at how to do this later on. But some of these things you know: Net Refrigeration Effect Total Heat of Rejection Heat of Compression Coefficient of Performance may not resonate with us.

We may not know what those items are. Mass flow rate per ton How much refrigerant do we need to move past any given point per minute to give us one ton of cooling mass flow rate of the system? How much refrigerant is actually moving? Those are all supporting pieces of information. But what we do want to be able to calculate and estimate is the Energy Efficiency ratio of a system eer or Eer2 Seer seasonal Energy Efficiency Ratio or sear or sear too the capacity of the evaporator How much heat does that evaporator absorbing capacity of the condenser? How much heat is the system rejecting the volumetric capacity of the compressor in cubic feet per minute? So we can actually calculate what this system is doing to gain a better understanding of the system and its components. When you look at a compressor and you're looking at compressor specifications that you if you dive deep, you can obtain the volumetric capacity of a compressor CFL You can verify wow, this system is operating at this capacity, this capacity and this is the volumetric capacity of that compressor.

And if you so desire and you cross, check it to the specs of the compressor and they match. Good deal. Again, it's an aid to give us a better understanding into the system. and it's Hands-On It's something you're doing.

You're plotting this out and it's not going to be perfect. But like I said, why plot it out? Number one reason: it's fun. So people think about plotting these systems out and like oh, it takes a lot of work. It's a I need to gather a lot of information.

You need five pieces of information to plot a system on a pressure enthalpy chart. You need the high side pressure, the low side pressure. Every time you gauge up, you're getting the high side pressure, and the low side pressure done. If you measure superheat, you're measuring the evaporator Outlet Temperature That's what you need.

If you measure sub cooling, you need the condenser Outlet Temperature That's what you're doing already. Compressor Inlet Temperature Maybe maybe not, but pretty much everything you need to know to plot a system on a pressure enthalpy chart you already have through a normal servicing or of the equipment: High side pressure, low side pressure condenser out the temperature evaporator Outlet Temperature Compressor Inlet Temp Five pieces done and with those pieces of information, you can calculate pretty much everything that we listed before. All right. I'm leaving out the electrical stuff.

You will need to know the actual amperage shore of the motor, the voltage supplied to the motor power factor, but that's sharp we showed you. We took a look at that chart before, again more ink than Blank Space But let's take a look. Let's break down this chart. There's nothing complicated about the chart unless we look at it in its entirety from the gap.

so on this chart, there's a series of horizontal lines. The vertical axis on that pressure enthalpy chart is our pressure. so any horizontal line on that chart represents a constant pressure. So if we are at any point on that chart and we move directly to the left or directly to the right, the pressure that we are experiencing in our system will remain unchanged.

It's only when we cross those lines of constant pressure does the pressure change. So if we move up on that chart, pressure's increasing down. pressure decreases pretty cool. The only difference is the only thing we need to be aware of that the vertical axis is in expressed in Psia, so that's not PSIG.

So for the most part, if you have a gauge pressure, then you're going to add 14.7 to that number and that'll get you real close to your equivalent PSI A rating. And again, we'll talk about that a little bit right. So horizontal lines, Lines of constant pressure. We move left or right.

Pressure doesn't change. Also, a set of vertical lines. and those vertical lines are lines of constant enthalpy. And this brings me to a really interesting question Because people like, oh, Eugene why did you write a book called Pressure Enthalpy without Tears? What does enthalpy mean And I say well, enthalpy is a fancy word for he So they said well, why don't you just call it pressure Heat without tears And we could have done that.

But how much would you pay for a book called Pressure Heat without Tears? Maybe? Yeah. Twelve dollars. Thirteen dollars, right? Pressure Enthalpy without tears. 70 bucks.

So Pressure Enthalpy without tears It is, right? So when we're talking about enthalpy, we're talking about heat content. Different from temperature. right. Temperature is the level of heat intensity.

where heat enthalpy is the actual amount of heat content in BTUs per pound. So the vertical lines. Lines of constant enthalpy. Lines of constant heat content.

If we move up and down on any of those lines, the enthalpy or heat content stays the same. It's only if we move left or right does the heat content change. If we move from left to right, the enthalpy is going to increase. The heat content is going to increase, whereas if we move from right to left, the heat content enthalpy is going to decrease.

Fair enough. No rocket science, right? I Promise you guys, no rocket science today. In the middle of that pressure enthalpy chart is our saturation curve. Some people like to call it the thumb print curve.

Anything underneath that saturation curve is what you have on your pressure temperature charts. Underneath that curve is where the refrigerant is a mixture of liquid and Vapor. So if you've heard the term saturation right, saturation exists underneath that curve. We've also heard the term superheat and subcool.

Off to the left of that saturation curve that is our sub cooled liquid region. So at the outlet of our condenser, we have sub cooled liquid. So the outlet of our condenser is going to extend to the left side of that saturation curve. The right side of the saturation curve.

that's our superheated Vapor region. So at the outlet of the evaporator, we have superheated vapor. Ideally, at the inlet of our compressor and the outlet of our compressor, we have superheated Vapor. So all of those components are going to position themselves on the right side of that curve.

So we have lines of constant pressure, lines of constant enthalpy. We have our saturation curve dividing the chart in three sections: superheated vapor, saturated, and then sub cool liquid. So far, so good, right? you're going to go home and write a better book. So underneath that saturation curve, we have lines of constant quality.

Each line underneath that curve represents a 10 degree change from liquid to Vapor or vapor to liquid depending on which way where moving. So for example, that first line underneath the saturation curve all the way on the right side where mostly vapor. But that first line represents 10 percent liquid, 90 vapor. The right edge of that saturation curve represents 100 Vapor zero percent liquid.

Similarly, the left boundary of that saturation curve represents 100 liquid and zero percent Vapor That first line in now we're 90 liquid 10 Vapor. As we continue to move in from left to right, that refrigerant is going to become more and more vapor and less and less liquid. So if I threw a dart at that chart, I would get a bill to repair screen. So I'm not going to.

But if we threw a dart wherever that Dart landed underneath that saturation curve, we should be able to determine what the makeup, what the composition of that refrigerant is. Is it 80 liquid? 20 percent? Vapor 30? 70? Whatever it is. What I'm discussing now applies to a single compound refrigerant. So R134a R22 right? A single compound refrigerator, not a blend, not a 400 series.

Underneath that saturation curve, we have horizontal lines and those lines represent constant temperature. So for a single compound refrigerant, one pressure is going to correspond to one temperature and vice versa. If we have a blended refrigerant, those lines of constant temperature are going to angle so they're not going to be perfectly horizontal. And as an aside, if you're dealing with a refrigerant and you want to determine the blend, I'm sorry the temperature.

Glide If you draw a horizontal line across that saturation curve and you read the temperature at one end of the saturation curve and then the temperature at the other end of the saturation curve and subtract, that's the temperature going kind of cool. So if you have a pressure enthalpy chart, you can do that. Once we get off to the right of that saturation curve, those constant temperature lines curve down so that Top Line underneath the saturation curve hits the right side and then it curves down until it hits the X-axis the bottom of that chart. We're going to talk more about that a little bit later.

The right side of the chart's a little busy because there are some other lines. Those are lines of constant volume. Those are gently slope lines, And those lines represent how many cubic feet of refrigerant are required to make one pound. So we can look at a point outside that saturation curve on the right side and we can determine we can determine how many cubic feet of refrigerant under those conditions are going to be required to make up one pound.

And we typically do that at the inlet of the compressor. What? How much refrigerant do we need? Or how many cubic feet of refrigerant are entering that compressor. And if we know the volume, the constant volume. We can also determine how many pounds of refrigerant that compressor is moving right.

If a compressor is moving a thousand cubic feet of refrigerant every minute. If we know the how many cubic feet make up a pound, then we can then determine how many pounds of refrigerant that compressor is moving. Remember, compressors are fixed volume pumps. so if the refrigerant is more dense or less dense, the weight of the refrigerant that's moving is going to determine by how many cubic feet of refrigerant we are moving per unit time.

Makes sense. We cool. Awesome. My favorite one.

Now we have steep lines. This is what trips a lot of people up. lines of constant entropy. People look up the dictionary definitions of entropy Decay Disorder The state of unrest.

Well, how does that apply to us? Well, I've spent literally three years figuring out how to teach entropy. and I now teach entropy with one word: reversibility. If a process is reversible, there is no change in enthalpy when we talk about Decay If a tooth decays, it cannot undecay. Decay cannot be reverse.

It can be stopped, but can't be reversed. So think about refrigerant in a cylinder. If we have a piston and that piston moves inside that cylinder to compress the refrigerant, the pressure increases from one level to the next. But if we take that piston and we move it back to its original place, the pressure in that cylinder is now going to return to its previous level.

So compression is a completely reversible process. So the compression process in our system has to follow one of those lines of constant entropy or be parallel to those lines of constant entropy. Think about an induction heater you might have in your kitchen at home. What I want you to do is go home and take an ice cube and put it on the induction heater.

Slowly increase the temperature of that induction heater. Some point that ice cube is almost immediately going to turn into water. It's called melting. Once that point has been reached, What I want you to do is turn the heat right back to where it was before the ice melted.

Does the water magically turn back into an ice cube? No, Which means the melting of ice is not a reversible process. So if I were to plot out the process of melting ice on an equivalent chart, I would be Crossing Lines of constant entropy because there is a change in entropy. But in the world of refrigeration, air conditioning, we're concerned with constant entropy. We're talking about the compression process, so we pretty much have those are all the aspects we got: Lines of constant pressure, Lines of constant enthalpy, our saturation curve, Lines of constant quality, Lines of specific volume, Lines of constant.

Answer me, that's the chart. That's all there is. A completed chart looks like that on a pressure Anthony In a perfect world That's not the actual. If we have engineers in the room, then they're not going to be happy with that at all because that's not what it looks like.

But for a technician, we're good. I are an engineer, but I'm also a tech. and What? I found that the difference between a technician and an engineer is 14 decimal places, right? Technicians? We need to get the system back to where it was before it failed. Engineers different set.

So here's what the system looks like. A plotted system. Our compressor is represented by that red line. As the refrigerant gets compressed, the heat content enthalpy goes to the right, but the pressure also increases.

So the compression process moves up and to the right and follows a line of constant entropy. or is parallel to. So there's our compressor at the outlet of the compressor. We now have our condenser.

That's the green line at the top. Notice: when refrigerant leaves the compressor, it's a superheated vapor. Our discharge line on a pressure enthalpy chart is actually part of the condenser. Notice: it starts in the superheated region 100 vapor.

Once at these superheats, then it becomes saturated. It changes state from a vapor to a liquid, and then once that refrigerant completely condenses, it, then sub cools. Notice that little triangle at the top left corner. We're now extending into the sub cool liquid region.

So three processes take place in our condenser, superheated Saturated subcooler. Next line, that's our metering device. That vertical line. Notice: As refrigerant flows through the metering device, there is a change in pressure and temperature, but no change in heat content.

That is a perfectly vertical line. so there's no change in heat content. although pressure and temperature do change. Magic After we flow through the metering device, that bottom line represents the evaporator.

Refrigerant enters. the evaporator is a mixture of liquid and Vapor Notice that blue line starts somewhere to the right of the left side of that boundary. We could tell exactly what the condition of refrigerant is by seeing where that point lies. So on this chart, we're about 20 percent right, About 20 percent liquid, eighty percent vapor.

I'm sorry. 20 Vapor 80 liquid I Think I said that wrong, right? But as we pass through that evaporator, our refrigerant boils. and that blue line representing our evaporator ends outside of the saturation curve in the vapor region. Meaning, refrigerant is leaving that evaporator as a super heated vapor.

And finally, that little line in between the two. That's our suction line. That's between the outlet of the evaporator and the inlet of the compressor. Ideally, that line is as short as possible, right? We want to insulate our structure lines.

Well, if you rip the suction line insulation off after you plot a system, and then you re-plot it, you're going to see that whole line representing the compressor is Shifting to the right. And that purple line that represents the suction line which is now tiny is going to get longer and longer and longer. And as you're going to see, that's going to affect system performance. All right.

So that's the chart that's pretty much what's going on now. Back in the 80s when I was in the field, our job was to get a system to blow cold air. Didn't matter how we did it, it was make the system blow cold air. Now, we want to get these systems running as effectively and efficiently as possible.

So efficiency is a big thing and efficiency is really just a ratio of what you get out to what it costs you to get that output. If I have high output and low input, my efficiency is high If I have low output and high input, that's going to be lower efficiency. So quick. example: So I might I have I have John He makes 10 widgets an hour and every hour he makes 10 bucks.

So for every dollar I spend, he's producing One widget right? This other guy Mike I'm paying him 25 bucks an hour. but he's producing 50 widgets in one hour and in that hour I'm paying him 25. So for every dollar I spend I'm getting two widgets. So yes, Mike is costing me more money.

But are we talking about what we're spending or what we're getting? Fair enough. So I want to talk a little bit about that when we talk in the world of air conditioning or Refrigeration and we talk about efficiency we're talking about again. Output compared to input, the output is what we're paying for. We're paying for cooling.

We're paying for that function of the evaporator, which is in charge of cooling the Airstream that's passing through it. The cost associated with getting that Cooling is all the other Heat that we're adding to the system that we later need to reject. And that's heat that we pick up in the suction line, which hopefully is as minimal as small as possible, and the heat that we pick up in the compressor during the compression process. That's heat that's being concentrated by compressing, but also heat that's being transferred from the motor to the refrigerant.

So when we talk about the evaporator, we're talking about the net Refrigeration effect. When we talk about what's taking place inside the compressor, we're talking about heat of compression. So we talk about efficiency being a ratio of what we get out to what it costs us. We really have this thing called coefficient of Performance which is mathematically the net Refrigeration effect divided by the heat of compression.

That's the only map we're talking about today. and when you plot out a system, then you you're going to end up with five points on this chart where you're going to get values and you can actually calculate what the NRE is, what the hoc is, what all the other system parameters are all right. But what is what is coefficient of Performance do For me? Well, coefficient of performance is mathematically related to Eer. We've heard of Eer.

You might not have heard of cop, but I know you've heard of Eer. Well, eer is the cop times 3.412 which is the conversion factor between B2s per hour and Watts We have 3.412 B2's per hour per watt or 3.412 BTUs per watt hour. However, you want to express it. Oh, but we don't deal with Eer, We deal with deal with Seer.

Well, basically Seer is approximately equal to Eer times 1.2 So if I plot this thing out I know my NRE I know my heat of compression I can calculate my cop and I can calculate my Eer. I can calculate my seer. And if we know that Eer2 right, two weeks, Eer2 is roughly 95 of Eer and CO2 is roughly 95 of sear. So if you multiply those numbers by 0.95 now you have approximate values for Eer2 and CO2 as well.

Plotting these things out: Really, really neat if you like to get visual. here's what a system looks like when it's operating properly. What? I'm expecting the system to do. But if I plot out a system that's overcharged, that's what it looks like in red.

The shift: The plot shifts up and to the left. If I'm overcharged, notice my sub cooling. that triangle on the left side gets bigger. Notice: the inlet of my compressor moves closer to the curve.

In other words, my superheat is going down. How about and on the charge? That's that. Plot shifts down into the right. So if you look at it, if we have a charge problem, that chart either shifts up to the left down to the right depending on if it's an overcharge or an undercharge right over feeding metering device.

I Have less refrigerant on the high side, more refrigerant on the low side. So now that chart, the shape gets shorter. Undefeating metering device: block liquid line Now I Have an excess amount of refrigerant on the high side, a deficiency on the low side, and now the plot gets taller. Right Low side Airflow problem: That chart moves down.

My operating pressures are going down, my evaporator superheat's going down if I have a high side airflow problem, my chart moves up and to the right, so airflow problems move from the bottom left to the top right, whereas charge problems move from the top left to the bottom right, so they move diagonally. So if you see a chart that's shifting along this X Y axis. it's an airflow problem if you see it Shifting the other way, it's a charge problem, so it's kind of neat. It's fun.

So I could pretty much do that all day. But plotting a system, people think, oh, it's really hard to plot this system out. Well, think about it. Let's say we have this system: I Got all these: Temptations Uh, pieces of information: All temperatures Condenser saturation temperature: 120 degrees condenser out of the temperature 100 evaporated saturation temperature 40.

evaporate outward temperature 50 compressor Inlet Temperature 60. right I Look at a chart First thing: I Do I identify the 120 degree saturation temperature in my condenser cool. Find it. it's right there.

Draw a horizontal line through it. then I Look at: I find the 40 degree evaporated saturation temp. I Locate it, Draw a line through it halfway there. I Locate the condenser Outlet Temperature right That line underneath the saturation curve I Take that to the left and where that line crosses the saturation curve I Draw a vertical line that identifies two points I'm going to call them A and B just for the heck of it now.

I Identified the outlet of the evaporator 50 degrees I Follow one of those lines of constant temperature down until it hits the low side pressure. I Identify that point that's between those two black points on the bottom. That's my NRE that's my net Refrigeration Effect I Now identify the inlet of the compressor 60 degrees. Again, follow a line of constant temperature down and Mark that point.

That's my compressor Inlet temperature. Notice those last two points are real close together. That's my suction line from that last line. that last point I Draw a diagonal line up along a line of constant entropy and that identifies that fifth.

Point There's my completed chart and now all I have to do is grab information from each of those five points, the heat content values at each of those points, and then you can crunch all the numbers. I Am not crunching numbers with you today. What? I had done I had created an Excel spreadsheet where I enter the values at A, B, C, D, E, you know, condenser Outlet evaporator Inlet evaporator Outlet Compressor and the compressor Outlet along with the system pressures and then the horsepower of the pump and then that will give me all of those things. Remember earlier I gave you that list of like 13 or 14 things that we can calculate.

So if you want this, just drop me an email. I'll send it to you. It's in an Excel spreadsheet. It's kind of cool.

all right for your own personal use. Don't Market it and sell it because that's not cool. but it's It's a lot of number crunching. You can crunch the numbers if you aren't the formulas, you can actually get them.

Uh, but yeah, it's easier in Excel spreadsheet. Just you know you enter what you got from the system and it runs all right. but this is not. It should not be intimidating.

It's a really neat tool If you want to gain a really really deeper understanding of what's going on in the system, it's it's great to use. Smart Tools I'm all form, but if you really want to understand the hows and whys Behind these things get some charts. Play around with it. All right.

Super super. Not comfortable if if you decide. All right. So this is all based on my pressure Enthalpy without Tears book.

All right if you this I just want to alert you to one thing we're finished actually. But if you want to, if you want to get the pressure enthal to be without tears book you can. You can get it on Eskogroup.org All right. And if you check out, be sure to enter.

Brian has a a code and it's HVAC School 22. we also just added HVAC School 23. either one of those will give you a 10 discount on the book. But I know a lot of you guys are on Brian's website already.

So if you are on Hvacrschool.com on the bottom of that home screen the home page, you can see partners and ask if you click on Esco Then that'll take you to the Esco website. Okay, and then you can get it through there all right, but still into that code. All right, 10 is 10. but uh, but yeah, that's my cell number.

that number Rings right here. Okay my office number, email address just Eugene Escogroup.org and I mean this was a long day. So you guys you guys definitely deserve an award for for hanging out all day. So thank you for your time I Appreciate it.

Thank you Ryan for the opportunity! Hey thanks Eugene Big thanks to ESCO Esco has been an amazing partner with us! You can find out more about Esco by going to ESCO Group Dot Org Esco Group Dot Org. When you go there, look at their E-learning site. You can actually get their entire bundle of products. So first you click on the e-learning tab and then go to all of the courses.

I Like to go down to subscriptions and bundles and you can get that kind of full subscription access all the fundamentals courses as well as the Esco all access subscription. That's my favorite. You can also get one with some of the add-on courses such as the 608 Prep or Kasha Communications Training Escogroup.org Or you can go straight to Hvacr.ylearn.network and look down for that All Access subscription so you can get access to all of their amazing training. Thanks for watching our video if you enjoyed it and got something out of it.

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