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welcome back to the honeybee for

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grasshopper tutorials and we've been

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through envelope geometry and materials

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program internal mass control loads and

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schedules we're going to finish up now

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with natural ventilation and HVAC

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systems for the natural ventilation of

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the object that you should place onto

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the canvas is here at sorry honeybee set

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EP air flow there and this gives us a

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few different options for how we want to

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deal with air flow in the zone the first

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thing I should point out is that energy

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Plus as a simulation engine is a it

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makes a very important assumption that

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all of the air in the zone is fully

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mixed that is it doesn't stratify it

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doesn't um have differential thermal

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properties based on solar radiation or

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adjacency to walls or anything like that

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it is one zone it's a sort of watertight

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zone or air tight zone and there's one

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temperature of air inside that zone it's

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a relatively simple kind of model to do

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more complex modeling it requires

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entirely different type of program

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structure a lot more complex a lot

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longer runtime and the accuracy of it is

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questionable so the so this is actually

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a very good simulation modeling type but

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it does have this limitation or

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assumption and that limitation is

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something you need to keep in mind as

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you are modeling the thing that that

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energy plus knows is what the air coming

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air temperature coming in as well as the

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speed and and level elevation and it

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knows the air speed and temperature

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going out

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and and it's sort of a closed system it

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doesn't know or doesn't take into

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account the presence of exterior

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obstacles so like this building that I

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have next door it's not going to know

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that this window here is probably

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obstructed from a lot of air flow or

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that this tree might be blocking air

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flow into this window so these are

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things that that you need to take into

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account in understanding how you're

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modeling the airflow because Energy Plus

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does not that being said it is possible

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to model a variety of different types of

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air flow including fans or windows or

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even stack ventilation and this

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component here gives you sort of the

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window into that Interzone airflow is

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for multi zone models and I'm not

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covering all the zone models in this

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this set of tutorials so I'm going to

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skip that the next one is natural that

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elation type and you can see that

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there's four basic options no natural

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ventilation window natural ventilation

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custom stack and wind ventilation and

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then fan driven ventilation so the so

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there's a few different options and

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depending on which one you select these

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inputs are populated differently so

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actually I'm going to pull the slider so

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you can see this if we connect 0 was was

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no natural ventilation these all go away

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so there's nothing going on there

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just Zone in zone now we're done can

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actually attach a panel here and it

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doesn't give us any information but it

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will so now if we go to number one with

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window natural ventilation you'll see

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that this populates and this is kind of

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cool it automatically reads the area of

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the windows that we have expand this

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even more here their zone one is a

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circus with glaze the area five point

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seven square meters has an operable

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area of 2.9 square meters and effective

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area the operable portion is 2.9 square

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meters and in a whole bunch of other

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things that relate to buoyancy in the

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zone and these you can set right here

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you can set when the window is going to

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open and close so a minimum indoor

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temperature and a maximum indoor

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temperature and you probably want to

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align those with the thermostat set

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points for your heating and cooling

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systems the minimum outdoor temperature

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for natural ventilation so that it's not

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too cold you're not getting cold air in

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and the maximum outdoor temperature so

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that you're not bringing in really hot

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air into the to the zone and so why

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don't we go ahead and set those maybe

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for 21 degrees Celsius for my minimum

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and since I think my cooling setpoint is

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probably going to be around 26 degrees

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I'm going to put my maximum natural

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ventilation of 25 degrees and that way I

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won't have windows open when I've got

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the air conditioning on for the minimum

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outdoor temperature I'm going to say

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that say 15 degrees so I'll see them

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maybe 18 degrees Celsius is it's about

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right and then the maximum outdoor we

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can put it say 30 degrees Celsius and so

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anytime the outdoor temperature is less

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than 30 degrees or between 18 and 30 and

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the indoor temperature is between 21 and

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25 we'll get natural ventilation then

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you can set a schedule that can be 8760

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hours of when that open or closed say

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you have some times when it can't be

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open then you can use this I'm going to

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skip it for now and just assume it's

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always open when it can be and then a

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fraction of glazed area that's operable

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so it automatically read how much area

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was on that but if I want to say that

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there's only 50%

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the window is operable then this will it

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should change it the effective operable

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area is 2.9 20 years I think that we

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have a 4 was the oh right so it's off by

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default it is assumed that 0.5 is the

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default so we can change this if we want

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the whole thing saves a casement window

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we have the whole window of be operable

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at a hundred percent there then you can

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see this changes to a hundred percent

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being operable and similarly you can set

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the love the glazing height this is the

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glazing area the glazing height the

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fraction that is operable you can also

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change these discharge coefficients

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either wind or stack which would prevent

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stack ventilation from coming in or from

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or wind coming in so you can read more

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about that if you hover over it

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explains it really well so that's

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natural ventilation and going to group

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these guys all together keep this nice

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and organized and move on to HVAC

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systems so as I mentioned for the

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National ventilation the zone is one

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airtight zone with sort of a closed

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volume of air contained in it and

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EnergyPlus natively has a lot of ways of

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modeling different types of HVAC systems

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for this tutorial and probably just to

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get you started the there's something

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called an ideal air loads system that is

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the sort of beginner system the easiest

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one to set up and use and you can find

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that here at honeybee set ideal air

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loads parameters there and so like

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everything else take your HB zones and

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swing it through here and then

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hook up your data so now we've got the

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HVAC and there's just a few simple sets

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of things to input here one is whether

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you have outdoor air for how it it sets

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outdoor air and this actually relates

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directly to setup inputs we had before

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for internal loads and back here at

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ventilation for area and ventilation for

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person we said how much air flow is

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moving through the zone this is

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basically air for breathing and here we

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can set whether the or how the HVAC

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system delivers that air it can be

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delivered as you can say none you don't

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want it to deliver any of that air so in

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which case you'll see that there's as

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much less airflow there's no airflow

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through the zone or you can see it do it

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as a maximum of ventilation or some of

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ventilation actually 62 which is what

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most jurisdictions are using their

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standard for fresh air requires the sum

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of those so and this is by default set

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as the sum I think well if it's not

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maybe we should make sure that it is by

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putting in number two there and then

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looking at the readme which says zone

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one has this outdoor air requirements

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set to some so that's right you can also

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set the cool supply air in love the

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heating supply air temperatures I like

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to leave these default I think if by

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default it it's a 50 degrees Celsius and

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15 degrees Celsius

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there's no hover over instructions here

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but I'm just going to leave those and

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then the max cooling and heating

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capacity if you wanted to set that the

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danger of setting that is that you could

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have times when the system requires more

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heating or cooling than

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able to provide and so it would skew

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your energy results so that's it for

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HVAC systems the only other thing that

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you need to know about this is again

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this is an ideal load system so it is

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supplying just as much heating or

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cooling as it's needed to satisfy the

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thermostat set points those thermostat

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set points were set back here under

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schedules at heating setpoint schedule

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including SEP 1 schedule we can see that

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heating cooling setpoint schedule pretty

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quickly by looking at visualizing the

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set points using this these components

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and here we can see that looks like the

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heating setpoint is between 20 to 21

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degrees during most of the day and then

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16 degrees during the night with a more

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set back in the summer and so 16 to 21

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degrees and then the cooling is between

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24 is it's 24 during the day and 27

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night time set back so that gives you an

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idea of what the what the HVAC system is

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is set to and actually that makes me

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think that this I did not set my natural

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ventilation correctly should be about a

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23 probably in order to not overlap with

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the cooling

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so let's run this and and see where we

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are in terms of our energy use with this

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system that we set up and the while it's

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running the ideal load system provides

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just as much energy as you need to heat

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or cool to that setpoint and it is not

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taken to account the coefficient of

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performance COP of the actual systems

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the cooling or heating systems and so

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you really need to post process that

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part of it on to the results so let's

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see if we have any errors zero errors

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there's a whole bunch of warnings and it

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looks like these are standard warnings

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so here I've hooked up electrical

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equipments lights heating and cooling

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and so you see there's 7500 kilowatt

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hours of cooling 1276 of heating but in

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order to tell how much actual heating

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and cooling energy you would use you

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need to multiply it by the coefficient

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of performance and so for instance a

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standard heat pump for cooling would

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probably have a co P of about 4 or 5 so

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you'd actually divide by say 4 so 7 5 0

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8 divided by 4 would give us the actual

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energy use for that system standard

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boiler might be around Co P of about 0.8

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so you would divide 12 76 divided by

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pointing to get the actual heating

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numbers so I hope that helps explain the

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HVAC systems and ventilation systems and

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provides a quick overview of all these

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with a vetted assumptions and data in

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the HP zone component there's a lot here

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a lot more to play with and to

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to look at but I think this should get

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you started and get rolling the last

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thing I wanted to mention was that it's

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as you get deeper into energy modeling

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get more comfortable with it it's always

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good to go to the source itself and one

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of the really great things about

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honeybee is it makes it pretty

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transparent so if you go to the folder

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where your work is being saved here you

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can see this IDF file which is what is

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being what is what is running the

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simulation and if you double click on

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that IDF file that will open this EP

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launch browser window and from here

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there's all kinds of ways to access the

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native data the sort of most useful is

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probably this IDF editor where you can

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open it and see press control L and

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you'll just see the the classes that

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have been populated and you can see all

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the different things that we just set so

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for instance the ideal load system you

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can see it has the maximum heating

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supplier air about 50 degrees in the

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next minimum cooling 13 and it's using

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the outdoor ventilation rates that we

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set as a sum etc etc and so each one of

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these different objects has all that

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smarts embedded in it and it's all

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should be quite transparent out of the

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inputs from honey-b into here the IDF

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and ultimately it's the IDF that's being

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run by Energy Plus by the same token if

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you want to know more about Energy Plus

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or you're having questions or problems

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this help menu is a fantastic place to

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start the energy plus input-output

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reference is a highly detailed

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compendium you can see it's 2200 pages

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of all of the different inputs and

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outputs that Energy Plus can give you

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and this is not what I would call

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pleasure reading but it's a good way of

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if you have any questions to search

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through this and try to find the right

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answers so I think that's a good place

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to leave you a good luck in your energy

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modeling have fun enjoy and until next

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time I'll sign off