hello and welcome to this V suite version 0.3 video tutorial which is the second in a series of envy video tutorials and in this video tutorial I’m going to cover how to do some sort of services specification or to provide some details of the operation of the simple envy zone that we created in the previous video tutorial so I’m starting pretty much where I left off in the previous video tutorial I’ve got my room I’ve got my end the node set up and I’ve simulated this room and I’ve produced very simple temperature data for this room but let’s that’s not very realistic usually buildings have a level of heat sing or cooling or occupancy etc so let’s specify some of those things for this particular zone so I’m going to split my node editor window into to make this a little bit bigger and on this side I’m going to keep my main v sweet node tree and on this side I’m going to move to the env network node tree which is signified by this windsock icon and as i’ve previously done an env geometry export i should find i have an existing in the network within this node tree and this NV network will have one node in it and that is an ND zone note and it’s created automatically based on the Envy’s NV zones I have specified when i clicked export on my geometry export and this NV zone node has got the name of the name of the blender object name of the zone it’s got a guesstimate of the volume of that zone and we have a controlled type menu here which I’ll come to a little bit later the main thing about the node is it has these input sockets for hvac heating ventilation and cooling occupancy equipment and infiltration so let’s say for example that I have a heating system within this room which is going to try and keep the temperature at 20 degrees Celsius so I need a for that an HVAC node to connect to this HVAC socket so ad and in my zone nodes I’ve got a list of all the relevant zone servicing nodes and I create an HVAC node which now connects to the HVAC zone socket so by default we have no heating system and no cooling system designated but I can change that so i can change because energy plus is an american piece of software where the heating and cooling of buildings is often done via air the heating and cooling systems applied within NV sort of relate to the supply of either hotter or colder depending on whether you’re employing a heating or cooling system so we can limit the flow rate of this heating and cooling air or we can live it limit the sort of heating or cooling capacity of the air that’s being supplied or we can limit both or we can have no limit and the system will just produce as much heat or cooling as required to maintain the temperature that we specify so for the moment I’ll probably say I’m just going to limit the flow capacity sorry I’m going to limit the flow rate so if I limit the flow rate the options that then become relevant are the temperature of the air that I’m going to supply to the space and I can say two degree Celsius and i’ll mention now although the building that you model may not have an air heating system the purpose of this sort of process is to define the overall heating and cooling requirements for a space so it doesn’t really matter in what way the heating or cooling is being supplied all that’s going to happen is in this case heating and cooling is going to be supplied by an air stream to maintain a temperature

of 20 degrees Celsius and from that we will get an overall heating and cooling value in kilowatt hours in terms of energy so even if you’re building doesn’t employ an air heating or cooling system in terms of only working out overall energy consumption this is still a valid approach so the heating and temper I’ll keep it 50 that’s fine I can now also specify what’s the maximum rate of air that’s going to be supplied to the system and that is in meters cubed per hour so I’m going to put that up half a meter cube per hour or 500 liters per hour and then we set the set the thermostat level so if this space that this level basically says if the room is below this level we will employ this heating system to bring us up to this level beyond this level above this level of 20 degrees Celsius the heating system shut down its only there to bolster the internal temperature up to 20 degrees Celsius so that’s fine and if we were looking at an env HR system we could specify some heat recovery here but at its most simple that is the only metrics we need the other options for the moment about cooling and how much of this air being supplied is from the outside can be left as none for now we have some input sockets on the HVAC node one is to specify the schedule of when this heating system is in operation and not so if it was a commercial building for example and the heating system is only in operation between nine and five on work days we could specify that schedule for this HVAC system we can also specify a schedule for the thermostat set point for the heating system and if we’ve chosen cooling for the cooling system and i might play with a few of those options in a minute but otherwise that’s enough for an extremely basic heating system to be employed in the building so if i come back to this node I don’t need to export the geometry again because these definitions apply to the geometry on layer 2 they don’t apply to the geometry on layer 1 I don’t apply to this geometry they apply to this geometry so I don’t need to export the geometry again but I do need to re-export the MV context so if I react sport that I calculate again and I maybe put this back on hourly and plot that again you can see now our ambient temperature is still the ambient temperature but our building now doesn’t go below 20 degrees Celsius for the level of heating that we have applied if I reduce the air flow rate of the heating system maybe to 0.1 meters cubed per second again export the context redo the calculation and create that plot oh that’s still enough to keep the building at 20 degrees Celsius so let’s try even less 0.01 and now we see there’s a little bit of an effect at the 20 degrees Celsius line but the heating capacity of the system now is too low to maintain the building at 20 degrees Celsius all year round so that’s fine i’ll put that back up to 0.5 now because i have a heating system applied i can now select heating wats as a metric so if i export that again and calculate again we’ll see that we’ve got a new metric appear within our list of metrics i’m going to turn off the climate because the climate temperature

doesn’t relate to sort on the same numerical scale as the heating i’m just going to look at the heating temperature or the heating wats required or used by the building so there we can see now the heating wats at the building needed to maintain a minimum temperature of 20 degrees Celsius so as you can imagine that heating requirement is much higher in winter when it’s colder outside we’ve got more heat losses through the fabric of the room and we need to replace those heat losses with our heating system to maintain 20 degrees Celsius if I wanted to install a cooling system I can do the same thing again I can have a cooling system I can choose if I want limit capacity rather than limit flow rate limit capacity means there’s a maximum capacity in terms of what’s that the cooling system can apply and that cooling system limit is set here and that’s in what’s so I might keep that at 1000 watts or a kilowatt and my thermostat temperature I’m going to say is 24 so any time my room goes above 24 degrees Celsius my cooling system kicks in with up to a kilowatt of power to remove heat from the space and keep it at 24 degrees Celsius so i can now turn on cooling wats export calculate and once that has done i can now plot as well as heating what’s cooling wats i can look at those two i’ll change the color of one of the plots just so that we can see it a bit clearer and we can now see our heating wats are in black and our cooling wats are in red so our cooling system only comes on in summertime as you can imagine but we can see that it we’ve set a maximum capacity for that cooling system at a thousand watts and it reaches that capacity that does imply that the building does still reach higher than 24 degrees Celsius temperatures in summer so we could just check that now why are you not letting me ah I’ve left excuse me I bless the other window open i guess i’ve left the settings window open somewhere now we go I can now test if that’s the case I can just change this to temperature create that plot and yes you can see that although the cooling system does have some effect at maximizing temperature at 24 degrees Celsius there are still times when a temperature is above that um and the the sort of details of the options within this node and the scheduling of the when the when the system is on and off and the heating and cooling temperature set points that’s kind of covered in the energy plus input output manual I will just show you how to add a schedule it’s in the schedule nodes menu so i might say this is a schedule that’s going to apply to when the heating and cooling system is in operation and not in operation the schedule note says up until from day one of the year up until what day of the year is this particular schedule valid for and it defaults to 365 the end of the year if i set 180 and i set let’s keep on 365 for a moment so this these two further dialogues relate to the whole year and in the fours dialogue i say for what kind of days so i might say weekends and I might say weekdays it’s a space separated list of

the kinds of days and the complete valid list of the types of days you can have in there or in the V sweet user menu but let’s pretend this is a commercial building and I one there to be the heating on during the weekdays and off during the weekends so this button or this entry field for each of these day types that I’ve specified I can now specify time and a value you for the schedule so i might say for the first weekends from and again this dialogue starts at midnight so for a midnight until eight in the morning my system is off and i represent that with a zero and then i enter a user comma to then say for the next time period and that might be then from 08 to six o’clock in the evening the system is now on which i represent with a one and I kamar again and I say till 24 or midnight the system is off again so the last number should always be midnight because we start automatically at the previous midnight so that covers a whole 24 hour period ah that’s then for the weekends for the weekdays or I’ve actually done it the wrong way around i’m sorry i’ve specified a weekdays heating system on it should be weekend so i’m going to specify weekends first the way we separate between these two day types is with a semicolon so now i’m going to say 24 so the whole day it’s simply 0 so at weekends for 24 hours it’s 0 and for weekdays up until eight it’s off from eight till six it’s on and then from six till midnight it’s off again so if i press enter on that that those should go gray to say yet okay that’s a valid schedule that you’ve entered if i was to now say this schedule only runs for the first half of the year then i would get another set of options to fill in for however the schedule has change for the latter half of the year and i can have i think i think you can have up to three ranges of the year in which you can set different schedules but for now i’m happy to have one scheduled for the whole year for the weekends and weekdays so again final price export calculate and create plot we can see now quite clearly that at the weekends the heating system is not in operation so we often come down below and in it indeed in the mornings and evenings of the weekdays we’re not supplying heating to the building so the temperature now drops below the 20 degrees Celsius thermostat level but during those times when the heating is on we do achieve that twenty percent level so occupancy is done similarly I’ll just collapse these nodes down for the moment occupancy is done in a similar way that’s a zone node occupancy node we have lots of schedule nodes here where we can specify the schedule for the occupants themselves we can specify a schedule for activity work efficiency air velocity and clothing all the things that you require for a comfort calculation we can turn on comfort calculation here and once we’ve turned on comfort calculation we can also turn on co2 monitoring which I guess I could do now actually I won’t do this now because we don’t have a ventilation system set up and I’m going to do that in the next video tutorial so I’m going to turn that off but again process is fairly similar we can pick what kind of occupancy we have so I’m just going to go with number of occupants at the moment I can specify the maximum number of occupants that there will be at any time so 10 and then I could introduce a schedule node to say what proportion of those 10 people are they’re four different times of the day so if the schedule notes at zero there’d be no people if the schedule node said

0.5 there’d be five people in the space at that time and in a way because the occupancy schedule is going to be similar to the heating schedule I can just copy this schedule node bring that to the occupancy schedule node and I can say yes actually that’s perfectly fine as it is so where as one and 0 we’re turning on and off the heating system before 1 and 0 now is specifying 0 people and 10 people so that runs in accordance with our heating system or at least I’m going to keep it so here so we can set the activity level watts per person so there are 92 fine default for a commercial environment so again I can export that context I can calculate that and we can plot that out and you start to see some slightly higher temperatures and 20 degrees Celsius appearing in places and this is because the combination of the environment and the internal gains of the people is giving us higher than 24 degrees Celsius even in sort of parts of the year when the outside temperature is less than 20 so and we should then see also an impact on for example the heating consumption required in that space so we can see when the heating is off and these levels now when people are in the building are much lower than they were for the initial simulation so that’s pretty much we can set sort of constant or scheduled levels of internal equipment heating gains and we can also specify a simple ventilation infiltration coming from outside into the zone as well but for a sort of the basics of zone specification I think that’s all I need to cover okay thanks for watching