Video instructions and help with filling out and completing Will Form 2220 Deductions

Instructions and Help about Will Form 2220 Deductions

Welcome to the lecture series on process integration this is module 5 lecture number 7 the topic of this lecture is an optimization that is heat exchanger network optimization loops and paths I have already told you that there exists a trade-off between number of units and the consumption of hot and cold utilities in the last lecture we have seen that more is the number of pinch points more will be the number of heat exchangers which will be used in the hen because no more will be the duplication that's why when we go for a Ameer design we always get more number of heat exchangers because the streams are counted more times in the last problem we have seen that the number of heat exchangers required were 12 and when we consider a non Amir type design that means we pass heat from the pinch the number of heat exchangers dropped down to 7 so there was a scope of saving 5 heat exchangers by converting the AMIA design to a non Amir design now what is the difference between a ami are non Amir design in a Amir design we guarantee minimum hot utility and cold utility whereas in a non Amir design we cannot guarantee it so invariably in a non Amir design the amount of hot utility and cold utility will increase though we are able to decrease the number of units in a non Amir design the hot utility and cold utility requirement in increase thereby it will increase the operating cost of the heat exchanger Network whereas the non Amir design will decrease the fixed cost of the heat exchanger Network by decreasing the number of units so there is a trade-off between this to decrease in the heat exchanger Network cost that is fixed cost and increase in the operating cost so if there is a profit that means if the TAC total n1 cost decreases by converting the Amir design to a non Amir design we will go for it and if it does not decrease then we will not go for it so the conversion of a Amir to non Amir design is subjected to the profit which we get by decreasing tack of the end now let us see that will generally be scoped to simplify minimum utility designs that is Emir designs by a control reduction in the number of units by transferring heat across the pinch and therefore increasing the utility uses the number of capital items can be reduced that is a trade of between the units capital cost and the utility uses energy cost here if we are decreasing the capital cost the utility cost increases so how do balance this is the main job now we will let us see it in detail in order to explore the scope of a controlled reduction in the number of units it is important to understand the concept of heat roll loops and heat load pulse we have seen in the units target if loop is present in the heat exchanger Network it will increase the number of units by one so a single loop will increase the heat number of heat exchanger by one two loops by two numbers three loops by three numbers and so on so forth in the last lecture we have seen that the heat exchanger network content 12v tax changes for Amer design where there are two pinches one utility pinch one process pinch if I go for a non Emir design it will drop down to seven number of heat exchangers that means in that design Emir design five loops are present because it is reporting five more number of heat exchangers in comparison to the Emir non Emir design when I consider a heat flow from the pinch now let us see the concept of heat load loops and heat load Earth's heat load loops a loop is a setup connection that can be traced through a network via streams and units that starts at one exchanger and returns to the same exchanger now if I start from here I can go to t2 then I can go why are this I can go to four again one I can go to the same place come to the same plane so this is a heat load loop and we will see that such loops are present in a mere design and breaking such loops will be able to decrease the number of heat exchangers whenever a design features more than the target minimum number of units for the whole problem ignoring the pinch it is due to the existence of the heat load loops there will be one loop for each extra unit and we have clearly understood this now let us take a case study we have taken the stream data of this table delta T minimum is 20 degree centigrade now for the case study one figures below shows a minimum unit target of seven units of a mere three units above the pinch and four units below the pinch now if I apply the units target here so there are four that means three process streams and one utility stream that makes it 4-1 so there are three number of heat exchangers will be placed here including the heater if I put the target units target here so there are four you process streams one utility stream that makes it 5-1 for number so three plus four is equal to seven and here there is no heat is passing through the pinch and hence this is a M er design maximum energy recovery design now why this has happened by accepting the pinch division stream number one three and four are counted twice by the targeting equation u minimum n minus one and due to this twice counting of this stream numbers the number of units in this ami our design has increased figures