The inlet and outlet thermometers on a heat exchanger.
If you’re read anything at all on this site, you’ve probably noticed me mention heat transfer before. As I see it, heat transfer is life. Everything comes down somewhere to a heat transfer. It’s really neat if you think of life in terms of energy exchanges, it’s how things happen.
Yes, heating your home, how a car engine works, that heat transfer is easy to see and honestly, kind of boring Steve. The cool stuff that races across my brain is how the same heat transfer concepts can be found in normal things we do and probably don’t think about.
Every single step you take, throughout your life, every one, is an energy exchange. Each time your foot touches the ground, you and Earth are swapping something. Can you just stand ankle deep in a pile of snow? Why not? Because the Earth is like “heck no man, this stuff is cold. Give me your warmth!”
You yell across a room, audio energy hits the little hairs in my ears, they shake and wiggle, in just a way to convert that energy into something my brain can decode. Read more
Image from NASA
What the heck is thermodynamics anyways? How does the science of thermodynamics apply to our boilers? Right now, I don’t know and I’m not sure how the laws of thermodynamics apply. This is what we are going to try and learn about today. Sit back, grab your coffee, a pencil and some paper for notes, and let’s figure out thermodynamics. Read more
Simple braking system diagram.
We are getting into some stuff now aren’t we? We started off small with some basics but we are already moving into some heavy territory.
It is important as building engineers that we at least understand some concepts behind the principles of hydraulics. For example, when a new building is being designed, planners must take into account moving water or fluids around as needed.
Will a chiller need water from the roof? What size pump and piping will the system need to deliver the desired amount of flow or pressure? How far does the fluid have to travel and what obstacles are along the way? Read more
The definition, how we measure it. This is next in our series of engineering fundamentals. Pressure is awesome, it is everywhere. It exists between your house and the outside, it changes as you drive and stop your car.
Pressure, like temperature, is one of the basic engineering measurements. As with temperature readings, pressure readings provide you with an indication of how something is operating. It might be the operation of an entire system or the running condition of single piece of equipment. Pressure changes even indicate weather changes right? Read more
Okay smarty, go to a party girls are stancin’, crowd is showin’ body. Thank you Young MC. I had that single. If you don’t know what a single is – bite me.
Last post we talked about sensible and latent heats, after building up our foundation with molecules and energy talk. This engineering fundamentals post is going to go over temperature. Okay smarty pants. Read more
Dear Steve – name the two most confusing heat transfer concepts ever attempted to be taught to you by the military? Great question. Sensible and latent heats. Most confusing thing EVAR! I have had so many people try to explain them to me.
I still barely know what sensible heat is, let alone latent heat. I am actually kind of excited to put this post up today because that means I get to re-visit the very confusing, to me, engineering principles of both latent and sensible heats. It’s been so long that I believe there are 8 earlier posts on the fundamentals, this is continuing along that path.
We’ve talked about heat and getting it to do work, the various laws. Now we are going to keep going by looking at these two ideas.
Getting your brain around the ideas of both sensible heat and latent heat is really important for people looking to make careers in engineering, hvac, refrigeration, combustion. It is important to at least have heard of the fundamental principles of why things, like substances, behave the way they do. And how man has harnessed the power to use them to do work. Read more
The 3 components needed for fire (4 now.)
Heat is SO lazy. It never wants to work, always calls in sick. Getting heat from an object to do work for us is ideal though, it’s one of the main reasons boilers are such workhorses and continue to do work for us in the 21st century.
I guess fancy pants people can analyze the energy conversion from heat to work using our now always referred to post on the Laws of Gases (Boyle, Charles.)
The energy transformation from heat to work is of major interest in the building engineering world. Kind of anywhere that uses steam really. To see how this conversion happens, let’s, once again for the billionth time, consider the pressure, temperature, and volume relationships that hold we know hold true for gases. We have already covered this so… Read more
We’ve all been waiting for it. Maybe you thought the principles of energy below were going to come out with Newton’s Laws earlier. You’ve heard them before, maybe in like sci-fi thrillers where the entire world was going to end or a mad scientist was trying to devise something so sinister.
This quick post is going to be about the principles of energy transformations – the conservation of energy and the conservation of matter.
How does this apply out in the world?
Systems are designed either to carry energy from one place to another or to change a substance from one form to another. As you know, systems are everywhere surrounding us. Hello Terminators. Your home has a thousand systems (furnace, plumbing, maybe not 1000,) your car (fuel, exhaust, heat,) buildings for the building engineers reading this. Read more
What is heat?
Time to once again rack your brains people. We have already gone over quite a bit in just over a month of internet existence. Earlier we discussed molecules. Remember how all substances are composed of very small particles called molecules? The energy associated with these crazy, gringo molecules is called thermal energy.
Thermal energy, like his beefier bro mechanical energy, exists in two stored forms and in one transitional form. Read more
Some random atom model.
Before we start, can I just give you all a cheesy thanks? Like most of you, I enjoy learning to a degree. Seeing as how I started this back in 1992, this type of work not the site lol, it has been a constant learning process.
By me trying to structure a website that is helpful and informative, I have to obviously go back and learn some stuff that I haven’t looked at in a while. And by doing so, I remember why I love engineering and energy so much. Everything has to follow the rules and laws – Newton, Ohm.
Today, let’s go over mechanical energy. What it is, how potential and kinetic energies factor in, stored energy maybe, work. Makaukau (get ready in Hawaiian.) Read more