welcome to another SRC coil selection walkthrough my name is Will click I'm a sales application engineer here at src's Richmond division in today's video we're going to show you the best practices for designing a heat pump coil and Enterprise src's coil selection [Music] software so we're going to start start by creating the project profile in your enterprise software so with that just fill out the basic information the top like you would any normal selection however we're going to call it indoo
r coil because it will be operating both as an evaporator and a condenser at different points so we start with indoor coil cooling mode from there we'll go over and uh enter your thel properties generally you're going to have a wet Air Stream since you're going to be trying to get moisture out of it on the evapor side so we'll start with a 2400 CFM which is just a plug number you'll s enter your own information for that uh 867 is the uh conditions that we chose for this generally that can be any
type of for turn air temperature that you're seeing in the space 80 is probably on the highest side for most uh Comfort cooling from there we're trying to get this select the capacity down to where your leaving air is around 55° that way you should be getting good condensing on your evaporator coil and raining M set moisture out of the space after that we'll select our refrigerant in this case our 410A which is the most common that we're still seeing today uh refrigerant temperatures again you
should have that based on your system but for a baseline we're going with 45 110 baright and then we'll be doing our tube size the 3/8 tube is our starting point that's a good Baseline and you can refine from there unless you're doing a particularly small or large system uh airf flow again we're all the to and we'll go with copper tube rifle tubing is usually where I like to start it gives you a little bit better performance the aluminum fan d55 and corrugated is again a good starting point and
we can refine from there our size I'm going to be going with on this selection is 24x 24 if you can stretch your coil out a little bit more so have a longer fin length that's generally the better ratio for cost Effectiveness and then fins per inch 10 fence per in is just a good standard Baseline that we can start and uh increase from based on our conditions for searry we like to start with full circuit again just for a good Baseline as you can see once we get all the entered we're a little bit l
ow on our capacity at only uh 60,000 so we're going to change S to a half circuit to increase our refriger pressure drop but gets us a little better performance again this is still all how you would normally select an evaporator at this point um doing a little bit more refinement on the circuits so we're getting it down to six circuits however now we can see that our refrigerant pressure drop is substantially higher so we'll have to go with an eight circuit and increase our fence per inch a litt
le to try to get that capacity up we're a little higher than we normally see on the air side pressure drop but not accessive make sure you save that and then we're going to go over to uh copy the coil so just go to coil save as and we'll create the same coil in heating mode but we'll have to change it to a condenser coil again you'll go back through you'll have to reenter all the information from before it should still be the sing for the uh air flows your temperature is obviously going to chang
e with that so we'll go on the uh lower side of your entering air temperature range so I like to go through and copy my uh other coil from before just so that I can make sure I match up all the conditions so I'll do a screenshot of it again we've got to go back in your 41A our condensing temperatures and Hot Gas temperature will be varying based on your system however the 117 193 fahit is a good starting point now we need to recreate the same coil make sure that you line up all of the property e
xactly you don't want to design an evaporator that's 55 and a condenser that's 0075 that's supposed to be operating the exact same so once we get all of those entered back in we'll see that uh your performance comes out see you we are again we're a little better on our refrigerant pressure drop and our capacity is uh right where we want it to be so this looks like it's a pretty good setup for this one so now we're going to go back to our terminal properties just check make sure everything's stil
l aligned since we've got a little extra on it we're going to uh a little lower than where we'd like to be we're going to play with our condensing temperature sum bring it down until we get it lined up exactly that those conditions so you can kind of see where your minimum condensing temperature can be at so in this case it's 115 will get us right where we want to be and now you can base the rest of your system on that as well so next we're going to have to create the outdoor coil so to start wi
th we're going to be creating that as an as a condenser coil we'll call it outdoor in cooling mode since that's its primary op operation is cooling mode so it's condenser our air flow is going to be substantially higher on that unit typically we we don't really care about condensate blowoff everything since it's outside so we can handle that additional air flow and a higher friction or a higher face velocity the capacity we're going to line that up similar to what we had seen previously we usual
ly like to have our capacity at least 15% higher on the on the condenser to make sure that we are fully condensing meaning your indoor capacities so again we'll start with 38 2 go a little bit longer and we'll do a little higher or lower fin density start out with just those 10 fins per inch we'll go with corrugated again to start with we can always up that to sine wave or lower down to Flat if need be and we'll keep the same Fin High to start your system will dictate that uh for the fins since
we're outside again we don't have the concerns as much with the uh with the blowoff on the coils and everything so we can go a little higher fin density we'll start off with that full circuit and the system will automatically size your headers so as you can see we're a little bit light on capacity since we're got a pretty substantial uh Miss on this one we're going to adjust the circuit since it's so low and then we're also going to adjust a few of the other parameters to try to make sure we can
get it back up there looks like we're able to match it with just the circuits so now we're going to save it again just like we did before and make it a uh clear outro coil as you can see I just did a screen grab of it to make sure I could copy it exactly we're going to change it to an evaporator to operate and evaporator mode as your heat pump so outdoor during the winter time so you're going to have fairly dried air so you're not can turn about a wet wet conditions airf flow and you want to ma
ke sure you match all of the conditions from the previous one 4500 CFM entering air 47 since she'll be operating in colder conditions again depending on your climate and where it's operting you're probably going to want to run it a little bit lower than 47 potentially and as you can see we've got the errors coming up so we're going to go back see what it is is it's saying that we're exceeding the possibility so what we're going to have to do with that is go through and figure out where that issu
is coming from most like we're going to have to raise our liquid temperature slightly so as you can see we're looking through we're going to have to up it to 108 right now and change our circuitry some so once we did that we're able to uh get our performance to come through on it now again we'll have to change circuitry again to match on the other coil that's the big key whenever you change one on the indoor coil versus The Outdoor or the uh heating mode versus the cooling mode you've got to ma
ke sure the coil is match so if you have any variation you need to edit the other you can see now we're missing on this coil so we're going to have to adjust that circuit until we can line up both everything he transfer a balancing act so you got got to make sure it all works so now we're going to a sign wave it's a little more aggressive thin pattern at mejor fing going be a little tougher but you're going to be able to get more performance out of it and our pressure drop is still only at 49 so
that's well within normal considerations we'll up this back to a half circuit 13 F per inch sign wave to match and as you can see we hit our performance parameters so we're ble to still get where we need to be even with the changes that's going to do it for today's video if you're designing coils for heat pumps and looking for an expert partner to help get the most out of your unit visit our website or give us a call today thanks for watching and we'll see you next time
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