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PIMA COUNTY DEVELOPMENT SERVICES Submittal Checklist for Residential HVAC New Construction or Replacement Right-Sizing Benefits ? Residential Air Conditioning Systems (HVAC) have in the past been
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all right we're gonna talk about heat transfer this is a topical outline of what we're going to do we're gonna talk about how heat and witch's energy moves we're gonna talk about heat transfer coefficient you value HIM C transfer multiplies and we're gonna define sensible and latent heat we're going to tell you what the measure walls gross then net we'll talk about that partitions new walls floors slab elevated below grade floors ceiling ceilings and roof combinations windows glazing fenestration whatever you want to call it and direction become important doors people and appliances all those things we're gonna talk about we're going to give you some formulas for area and volume because you lot of houses have turrets now a lot of them have vaulted ceiling, so you have to understand prisms okay zoning what constitutes a zone will do a little thing in that it's not going to be any detail on zoning this is not a zoning CD, but we're going to cover some stuff that's important some considerations that are should be important to you alright so if somebody will hit the magic start button we will get going thank you cold can be defined as the lack of heat cold can be defined is the lack of heat cold starts at minus four fifty-nine point six and below that's about the temperature of outer space it's very close to absolute zero minus four fifty-nine point six Fahrenheit is absolute zero at that point in time all molecular movement ceases if you were to be able to stay alive in a — for 596 environment let's say — - 459 environment the blood rushing through your veins or the barely moving through your veins would rub up against the walls of the vein and that's friction and that creates heat now I wouldn't want to deal us frozen pizza with that amount of heat, but it's still heat, and technically we have to count it the same way that minus a 20 degree air 20 degrees above zero air and the heat pump can extract heat from 20 degree air all we need is a fluid of media a refrigerant that can drop its condensing temperature 10 or 15 degrees below 20 and if we can do that we can absorb heat from that because hot goes to cold you'll see that in next slide cold doesn't start until you get to minus four fifty-nine point six so everything we deal with heating cooling in our world is heat movement so when I talk about the heat moving in a cooling situation I'm talking about hot air going too cold air alright everything else is heat anything above this temperature is heat is energy okay heat is energy they are the same thing remember cold is lack of heat and therefore lack of energy no molecular movement the cells in your body that the small the nucleus and all the particles of the cell can't move and where they can't absorb oxygen they can't pass blood along they are dead from the lack of energy the lack of heat that's involved okay you have to if you want to understand how heat moves you have to stop thinking about heat in terms of hot air rises that's fine, but he...