Plate Fin Heat Exchangers - Part 3
 
Welcome to this lecture this is a continuation to our earlier discussion on the plate fin heat exchanger and today we will be trying to discuss about the fabrication techniques of the plate fin type heat exchangers. So we'll see if this is way to moving out and this is flu to which is coming in and coming out to these exchanges this is a cross-flow type and we also discussed about the counter flow heat exchanger configuration where we have seen that we need a distributor to distribute the floor I mean from when it is coming this is the nozzle then we have the head then we have the distributor to allow the flow to come in and then getting distributed and coming like this finally this moves out from this distributor pain and this distributor in Assembly and finally it’s getting collected to this header and the nozzle and moving out so when it is happening in this layer we have this is the sidebar and in the next there we have some different fluidfabricate this kind of heat exchangers so while forgetting this kind of messages we need to concentrate on quite a few things and one of them is the pain we need separating played we need head is winning the sidebars winning the caps it's 6:30 at the shop covers and the bottom cover and of course the seller and the NorthI love you can understand that and that was a couple things and we need a good thermal conductor contact otherwise they’re going to introduce some kind of resistances which will ultimately be great the thermal performance after eating so I need to ensure a good contact at the same time we need to also ensure that there is no leakage of puncture of the separating plate so that you know of the fluid 102 or any other three their mixing with each other so that we also have to ensure so we have a very stringent requirement particularlycurrent temperature in Fahrenheit in the depressing discuss about that in the little construction understood this is the way we have a separating seat or the last one will be told as the cap sit so this shift will be there on the bottom and on the top and we have one cat sit on top of it we have this side but on both sides we have the sidebars it is placed on top of the cab seat then we have the thing this thing this thing as in this is a complete thing which is placed on top Ford escape seat then we have another layer of this plate and then we have this side part and end on this side and this is another thing it may be of similar type on it may be of different time then we have another plate and on top of it again we have enough pain management like this so depending on the floor light and the calculation of the number of players we have to put those many number of players one on top of the other and then whole assembly has to be put inside a freezer so that they can be hold permanently or LG G3 with small volume in volume and then the whole assembly has to be placed by the real yes or no so this is how it is and that is because we have only four directions to designated for freight want this is the fluid 101 out similarly we have another two layers with two sides in this is another side from which one so it can come out and this moves out this isn’t coming and this week so we have four sides necessary for sides for the flow in and out for the two fluids so this is possible in across the exchanges but in case of a countercurrent here you know that is different so what we do in one end and127 get the blue colour and blue colour fluid is just stay on top of the Catholic we have placed this is the side but we have arranged it like this and another side but is like this kind of the sidebar and we have the distributor 21 distributor failed is from here to here then we have another distributed pain we had an arrangement like this then we have the main train in this region then we have another distributor like this and other things so as a result we find one two three four five different sections of the things starting to appropriate dimension and distributed as you can understand that display will be coming over here and this may not reach to this part so what we need to do we need to select a type of research that this fluid will come in and we’ll be coming out of the station to this way here so we need to put some kind of perforated feel so that you know this week will be throwing up to the last end of this one and if you look carefully into this part is that you will find that this length if it is like this this is where it is having the least length and here it will find the longest path to move out now what happens to this they are even find this is having the smallest length but here you have the listening so as a resultit has to travel all the way over here and then you know hear it finds small parts for this car took longer on this site for this week which is flowing from design to design this part is longer it will find the total length survive the plane from recently signed by the artful this part in this past almost equal so that the least amount of mail distribution of the street I will call some people will have the tendency to fall apart and even if it finds more resistance to this park it will try to avoid that car was and obviously we will not have the energy transfer in this region so define it as fraud number one and just transferred what we need to put is it to anotherthen we have put another layer of play so this place in Yellowstone park in a particularly for the straight one and on top of it now but we do is that you wanted to do it moving out from this sidethen charge it on the side and distributed on this site to take it out of this so now what we have is basically one layer of the cash then one day of treatment plan that we have separating plate then we put another layer for the second phase two and thengrade 1 and grade 2 worksheet at the bathrooms and we have a separating plate on top of the right now if we wish to return to spell minotaur and we have to just put on top of it and others in discussing it with put on top of it this way constitutes heat exchangers with the single layer of fluid 100/102 but often we will find that a single layer ofnumber to like that we were going to Aaron's in plant and play to and Lloyds Bank it will continue if you go back to the earlier but his client is missguided slightlyknow if we look into the other is so as we have said that there will be multiple layers so that we may need one and on top of it we will put another city on top of it soTerminator complete the assembly and the whole assembly will look like this and finally they will have we will have business line that is a compliment but this exchange would not get really in this song from the beginninghow far to fabricate this kind of built aluminium frame type of people will try to look into this process is quickly first of all look into bridge atput the aluminium so here we have the appropriate filler material will find that necessary if you are I will find that we need flowers when did the killer material then we need the heating so that I’m in the killer material will melt in presence of the appropriate plaques and then that will join the parent material with the only part that we are going to attach it to this separating play now hear this principle as we have said that clean parts are still together and then I mean I mean checking first with the feel amazing part with the filling material all this plates and filler material complete use of silica gel on top of it we have put that painting that whole action latestfind that the plate on top of it is filled with we have a filler material planted on top of the aluminium metal used in yellow colour one is the ceiling material it is integrated with that and this film materials used in this is just the only one that thinks that it's all on top of his family and other material features of separating play feel like that's when we have put it in the Maltings longthe molten what temperature it will quickly at in the temperature of the malt and back and in presence of the small tent floxacillin material will now melt and they will bond this thing with the parent material aluminium this is also made of aluminium and this is also with mostly this is 3000 series we have already talked about it so this is involved in that Moreton blocks and this class will help to make a bond between the filler and the parent material so this that’s how you know we will be getting a joint between also finally found it is taken out of this Moulton park we will find that we have a kind of joint between Amazon joint will be found between the plate and the feel so automatically thismovement ensured that there is a good time to contact between the state and the thing which is necessary or otherwise we will have a kind of contact to the distance between the between the pain and the plate so anxious to hear that we'll have a good time and tell me all about construction allowed to go through thisthe AC unit and then we thought we need to know is that I need to remove the additional flux and we have to wash it appropriately before we take the whole assembly for the next two kind of operation of the inspiration whether we have got a good joint on time so we'll talk about that inspection part later about the Technic good Technics smolten materialplay cleaning out the parts in the necessary and appropriate action so that there is no reason also on display in such cases afterwards we need to assemble them as absent application for the cost blowout on the current configuration put the I'm in here this is in contrast to the technique with peanut butter and fluff on top of it and it landed on the aluminiumpixel I mean this was ineffective and respects as well placed inside what is called the packing glazing finest and why we need the vacuum because we know that in presence of oxygen if we try to raise the temperature by degree they will find that the aluminium plates maybe getting oxidized easily and that will be very very difficult to break that outside late and to make a plate and the face to ensure that there is nosome kind of heating and followed by a followed by Fall out Boy I’ve been soaking time so that the whole assembly is getting heated up to a prerequisite time and when it is reaching to that desired temperature does it have sent me earlier about 542 central get around so we can and then stopping sign in the record-breaking finance so to reach to reach the desired temperature and when it reaches the temperature we allowed to be there sometime and then again we need some time with cool it down or along with naturally cool down or otherwise we often do it quick and then I will go for the cooling of fencing and then you know please call me when you get the final shape that kind of sometime later when we get the finally this is the kind of heat exchangers, we will get we get a heat exchanger depending on the construction, it may be across the heat exchanger, it may be counter current exchanger. Thank you for you attention.