Trascrizione
00:05:810Michele De Carli: Alright. So we were here.
00:16:480Michele De Carli: Yes, the effect of intercoloring. I have already mentioned that. Okay, but here you can see the effect of intercoloring. Okay, is moving the
00:29:200Michele De Carli: in this case they were mixing.
00:31:630Michele De Carli: I mean, if you work with excel with, if you work with a seller condition, okay, you basically
00:44:630Michele De Carli: go from this point to this point here.
00:51:350Michele De Carli: imagine that you have just fresh here. Okay?
00:55:658Michele De Carli: The difference is, you are cooling the outer air only by sensible load. Okay? So that means that in terms of enthalpy
01:13:880Michele De Carli: you gain 5 kilo juice or kilogram of air. Okay?
01:22:445Michele De Carli: And you have as reference. Okay, let's say, this is 25. This is 80. Okay? So
01:31:00Michele De Carli: so in this case, 18 minus 25, in case of outdoor air is 55, correct, and in this case it will be 50. So that means that you have
01:42:330Michele De Carli: a benefit of 10% on the premium great
01:47:280Michele De Carli: right. So by gaining or by
01:52:40Michele De Carli: lowering 5 kilojoules of kilograms of 50, 55. Okay. 0 Joules kilogram of delta H of enthalpy. Difference means that you have more or less 10% of less power to spend in the green coil. Okay, so that means that your size.
02:13:640Michele De Carli: the your cooling current will be sized for 90% of the power that you should consider in case of outdoor air to cool down in the
02:26:581Michele De Carli: I mean, it's not bad, but it's not dramatic. Okay? So it's not a huge amount of saving, as you have in winter condition. Okay? So the sensible cooling you can get from a
02:43:116Michele De Carli: heat recovery unit is, okay, is interesting. But it's not. Is not that that? Okay? But still it is interesting.
02:56:166Michele De Carli: Okay. Now, the
03:05:214Michele De Carli: what can you? What can we say? We have already, I think, okay. Yes.
03:14:700Michele De Carli: I I mentioned already. That. You might have different flow rates in peak load conditions in heating. And okay, so depending on the peak load that you have for heating
03:33:340Michele De Carli: fully. Okay, you will
03:35:740Michele De Carli: set the temperature difference in the room. Okay, pi, minus the 8. Okay? And you will have different room rates.
03:44:910Michele De Carli: As I told you today, is not a problem to manage the rate. Okay, because you can adjust the speed of the fund, and then you will have, as a result, the desired or required pro rate. Okay, of course.
04:02:308Michele De Carli: You have to size the components for the maximum, Florentz.
04:10:20Michele De Carli: that, of course, either or inside. Okay, so the rater, the rate that you have.
04:17:890Michele De Carli: then this has to be
04:20:570Michele De Carli: so. It has to be considered for sizing the ducts, the air inlet. Okay? And all the stuff. Okay, so your, all the, the the, the duct, the distribution system. Okay.
04:35:520Michele De Carli: has to be selected according to the maximum
04:39:590Michele De Carli: prorate among the one between Italy and here. Okay, of course.
04:50:370Michele De Carli: Right
04:55:610Michele De Carli: doorway. Let's go.
04:57:930Michele De Carli: No.
05:00:40Michele De Carli: How do you have to size the coils? Okay? So which is the sizing or of the coil
05:07:500Michele De Carli: for eating? I mean, you're quite.
05:11:880Michele De Carli: Oh, okay.
05:16:810Michele De Carli: you quite free to the sides. Okay. But let's say that in principle. Okay, in heating. Okay?
05:25:934Michele De Carli: Let's consider this point here. Okay, which is the same
05:31:406Michele De Carli: so in heating, you have to, let's say, face the the power of the recordings, especially in new
05:40:910Michele De Carli: new ventilations. Okay, where you have. Let's consider, if you have the electrical unique.
05:47:140Michele De Carli: Okay, it's almost mandatory today.
05:50:30Michele De Carli: like, Oh, it's mandatory for certain period. Okay? So after the delivery unit in case, you need to heat up the air, you need to face the Delta. T, okay, according to the the power. Oh, and then you and then you have the power for the headcoil. Okay, so remember that this is the red call power for winter
06:16:460Michele De Carli: in summary, it is slightly more complicated. Okay, so it's not complicated for the cooling coil. The cooling coil has has to face the enthry. Difference between the
06:30:60Michele De Carli: entry condition in the outgoing condition of the okay. So in this case. If this, the if the if the
06:41:890Michele De Carli: if we call the D okay, according to what we
06:45:730Michele De Carli: wrote before, if D is the outgoing
06:51:10Michele De Carli: condition, okay, at around 35
06:55:210Michele De Carli: 0. So this point here, these are the outer. Sorry if they are the outlet condition from the green coil.
07:04:480Michele De Carli: And let's suppose that you are providing, or the air empath directly in outward condition. Okay, the cooling coil has to face the energy difference of the of the between E and D, okay, so the the power that the cooling coil has to deliver is the the H times, the
07:31:400Michele De Carli: proactive in permission. Okay, so this is the power for the cooling product.
07:41:180Michele De Carli: What? Which is the power for the rate point
07:46:390Michele De Carli: you could say in principle? Well, we consider
07:51:220Michele De Carli: the temperature difference between 16 degrees and D.
07:57:550Michele De Carli: Is that correct?
08:01:590Michele De Carli: Yes, I do.
08:04:290Michele De Carli: You could say yes.
08:07:900Michele De Carli: Yes.
08:09:120Michele De Carli: Why? Because these are the design permissions, right?
08:12:940Michele De Carli: But, as I told you.
08:15:170Michele De Carli: you have also to think about what could happen in or outside the design condition. Okay, so what could happen in a
08:27:510Michele De Carli: I mean, you have always been, I mean, not always sorry. You have already experienced a a summer here in the parallel. Okay? And you know
08:38:549Michele De Carli: that you might have a a terrible
08:43:289Michele De Carli: humid day. Okay, with a low amount of solar radiation. Okay, like a froggy carbon in the air, but
08:51:460Michele De Carli: dramatically humid. Okay, so what would you have in this case? You have a room.
09:01:260Michele De Carli: Which
09:03:940Michele De Carli: did you do already? The the cooling out calculation of the current method? How many of you did it?
09:10:300Michele De Carli: Which is the the-the-, the major load of your building in summer.
09:20:800Michele De Carli: So not an issue.
09:22:130Michele De Carli: And so so radiation is, let's say, 90 80% of the route.
09:27:700Michele De Carli: But you are in a day where you have almost no consolidation load.
09:33:540Michele De Carli: But here today, in this idea.
09:36:530Michele De Carli: So which is the inner condition in this case.
09:51:710Michele De Carli: the ratio there ambient line is the ratio between sensible and total right.
10:07:740Michele De Carli: If this is 0, which is the line in this case
10:17:430Michele De Carli: negative positive, where is 0?
10:22:770Michele De Carli: Which is the orientation of 0
10:26:320Michele De Carli: vertical. A vertical orientation means that your room in these days does not need fully loaded.
10:35:550Michele De Carli: but we need to.
10:37:650Michele De Carli: They humidify the room, so you need to provide air with a low value of humidity ratio.
10:46:30Michele De Carli: but with the same temperature.
10:49:250Michele De Carli: And in that case the
10:56:320Michele De Carli: line will be this one.
10:58:980Michele De Carli: Okay?
11:04:230Michele De Carli: So, which is now the most critical condition for the great call.
11:14:930Michele De Carli: the design condition, or the cloudy, humid condition.
11:21:600Michele De Carli: Rally recognition.
11:23:820Michele De Carli: If you don't really hit up to the either 6.
11:30:20Michele De Carli: You will be frozen inside.
11:32:620Michele De Carli: or if you want or so you have to select either you have 2 unit there.
11:39:850Michele De Carli: or you're conducting the roof.
11:43:430Michele De Carli: Okay, so in this condition, forgetting
11:47:490Michele De Carli: comfort, you will have to provide air validified air at a neutral temperature at 26 degrees.
11:54:950Michele De Carli: and this is the only way you can control the relative humidity.
12:02:420Michele De Carli: humidity ratio or the humidity in general. Okay, without.
12:07:830Michele De Carli: And they're going through.
12:10:10Michele De Carli: Okay.
12:11:450Michele De Carli: So the Delta team of the red call
12:16:710Michele De Carli: will be not anymore 16 minus or 17, whatever it will be minus
12:24:540Michele De Carli: minus Td, but it will be TA.
12:28:110Michele De Carli: Minus the deal.
12:30:200Michele De Carli: Okay, the power for the 8 coin will be the one related to the from the out growing
12:41:190Michele De Carli: for the conditions out at the oh, okay, getting out from the calling and the room temperature 20 alright.
12:56:540Michele De Carli: And this is exactly why we have to.
13:01:400Michele De Carli: We have to talk about 1st on the
13:06:560Michele De Carli: a cooler system before the water-based solution.
13:11:230Michele De Carli: Why? Because
13:17:120Michele De Carli: this is the main difference between the fuller system and the pure water system. If you are just the farm boy and you have not. And the dehumidification is
13:34:160Michele De Carli: beautiful air conditioning unit that you have at home. Okay.
13:40:670Michele De Carli: what is driving the the, your air condition or phone call?
13:45:770Michele De Carli: If you are not providing air in the air, condition is the package.
13:51:840Michele De Carli: Okay? So you set the temperature, and in that case
13:56:30Michele De Carli: the temperature is driven by the solar radiation. But if you have no solar radiation.
14:02:20Michele De Carli: you don't need to cool, and but you have humidity.
14:07:320Michele De Carli: So you have to select. You have to choose. If either you want freeze.
14:14:70Michele De Carli: or if you want comfortable temperature, but very high, very. That is the problem that you have during night
14:21:840Michele De Carli: in your house.
14:23:360Michele De Carli: If you don't open the windows and you have this, the air conditioning, switching on.
14:29:160Michele De Carli: If you have instead a fuller system done in this way, you could reduce.
14:37:470Michele De Carli: So you put that low, level, low like, can you meditate?
14:41:160Michele De Carli: But we don't get confused or combining air and water?
14:49:590Michele De Carli: Okay? Because then you have they humidified here
14:59:700Michele De Carli: by the quick oil on board of the okay.
15:09:30Michele De Carli: So this is. And of course you have to check.
15:14:820Michele De Carli: since you are working with the same rate, coil in heating and cooling, you have to check which is the power in heating and the rate coil
15:23:600Michele De Carli: powering, cooling, and you have to select the next one great.
15:29:520Michele De Carli: So this is how you do the calculation. So this is the
15:38:590Michele De Carli: one of the most important issue. So for sizing the coin in Puri.
15:44:300Michele De Carli: Okay, the red coin.
15:48:245Michele De Carli: Let's face there.
15:50:190Michele De Carli: Temperature. Difference between indoor condition 26 and conditions outgoing from the cooling coil.
16:02:670Michele De Carli: Okay, so that's everything for the single doc thing. Okay, the
16:12:920Michele De Carli: single dust is the easiest way to have or to provide a cooler system.
16:20:301Michele De Carli: But of course we have seen that?
16:24:850Michele De Carli: we have a limit. Okay? So we have said that we have a limit so that means that the
16:32:290Michele De Carli: you need the same. Okay, client orientation.
16:37:350Michele De Carli: Okay for the rooms.
16:40:480Michele De Carli: But what happens if you have rooms with different lines, or if you want to adjust, or if you want to model model later, or to
16:49:520Michele De Carli: to have different tunings in different rooms.
16:53:630Michele De Carli: Well, of course, you have to make the system more complex.
16:58:510Michele De Carli: One possibility is to locate the Red Cross, not in the early unit. But let's say
17:09:430Michele De Carli: so. In that case you can adjust the inlet condition according to the required power that you have in the room. Okay? So you can add
17:22:810Michele De Carli: the
17:24:280Michele De Carli: A room with 16 degrees. You can have a room at 20 degrees in case you don't have cooling. You can enter there at. But this is where you can adjust the power
17:42:570Michele De Carli: up required by the different rooms. Okay.
17:49:20Michele De Carli: according to the power that you can provide by their.
17:54:260Michele De Carli: This is one option. Of course you have to think about that. You are locating a coil
18:01:660Michele De Carli: around the building in the different zones. Okay, you need to provide water, just call it.
18:14:580Michele De Carli: In some countries you could use electric coil. But of course.
18:20:297Michele De Carli: it's not the the most efficient solution. Okay, let's say that usually should consider what are called water based calls. Okay? And in this case you have to consider that you have an additional cost to face. But in this case you're able to to
18:44:840Michele De Carli: to be more flexible and to adjust the inlet conditions according to the
18:51:150Michele De Carli: sensible power that you need in the different zones. Only. Okay.
18:57:246Michele De Carli: What is important to remember is that with the rate calls
19:02:100Michele De Carli: the the the decentralized okay? Of course. Sorry the all the other stuff is located in the air handling unit. Okay? So the day humidification in case humidification, everything is inside of the air handling unit. Okay.
19:23:572Michele De Carli: what we're having a problem is
19:26:830Michele De Carli: just the Red Cross. What is important to remember is that with the Red Cross
19:34:685Michele De Carli: you can okay, control one parameter. What does it mean? It means that either you control the temperature.
19:45:200Michele De Carli: stay here or we control the relative humidity.
19:49:370Michele De Carli: Okay, so it means that the since the humidity ratio is, is
20:03:650Michele De Carli: dependent on what happens in the air of the unit, and that is fixed for all the rooms. Okay, you are not able to adjust the humidity ratio or the relative humidity in the room. What you're able to do is to control the indoor temperature
20:22:530Michele De Carli: in case you have some different
20:25:950Michele De Carli: rates of vapor inside of the room that will be above or below the design condition. Okay? So basically, what you're doing is that you are controlling the temperature.
20:41:340Michele De Carli: Okay, I can see you can't see anything here you can control the temperature. But by, let's say, swinging or ranging a little bit
20:51:410Michele De Carli: in the relative wind. Okay, so you're not able to to have a fixed relative humility. But you're able to fix the temperature.
21:00:400Michele De Carli: which is.
21:02:190Michele De Carli: I mean reasonable. Okay? So usually, you control the temperature, even though you're not able to perfectly control. But we are not interested in usually
21:16:160Michele De Carli: or okay in some specific applications like, for instance, imagine in a museum, okay, where you have
21:24:190Michele De Carli: ad cuts and so on. Okay, you might be interested instead in keeping the relative humidity constant. In this case you could keep the relative humility constant. But of course you have a a, a swing, a a change in the temperature. Okay, so there, I mean, most of the time, most applications. You usually
21:48:990Michele De Carli: try to maintain the temperature. Okay, constant. But there might be some some applications where you might need to keep the relative humidity constant. And then
22:01:870Michele De Carli: let's see.
22:14:490Michele De Carli: one.
22:19:390Michele De Carli: Okay, you can allow the the relative humility to. Sorry to the the type of thing to to change a little bit. Okay?
22:28:00Michele De Carli: Good. Okay, no. That is.
22:31:810Michele De Carli: that requires 1015 min. So we can talk about this next time. Okay, okay. So I think you had enough for today.
22:45:510Michele De Carli: and the we meet again on
22:49:810Michele De Carli: mandatory. All right. It might be that next.
22:55:610Michele De Carli: I don't can see it.
22:57:960Michele De Carli: Maybe Wednesday we don't have lecture, but I will let you know. Okay.
23:02:970Michele De Carli: alright, anyway. See you on Monday. Have a nice weekend