Kartläggning av material flödesflaskhals i ICA butik.
In the spring of 2014 Sweco Systems AB were commissioned to design a ventilation system for a newly built preschool in Linköping. Terms from the client was that it cost efficiency would cope with the energy demands that are placed on the building. The unit chosen was a cross-flow heat exchanger, and this work is to compare it with two other heat exchangers to see if a more energy and cost efficient could have been chosen. The heat exchangers that was chosen for the comparison was a rotating- and a counterflow heat exchanger. Simulations have been made to the different heat exchangers by the manufacturers. The values from the simulations are then used to make calculations of the heat exchangers use of energy in Joulin. Even a comparison of temperature efficiencies have been made to see how well the heat recycler is working.To get an economic aspect, the calculation of LCC have been made.This work was in addition to the comparison even to find out about the values that came from the simulations to the original unit consists. It turned out that the temperature efficiency shown in these simulations was calculated at a different temperature than the other heat exchangers so it showed a higher percentage than if it had been shown for the same temperature as the other units showed in their simulation. Thus, a calculation of the temperature efficiency for the same temperature in order to make a fair comparison.After studying the different values it was concluded that a rotating heat exchanger should have been chosen instead of the original cross-flow heat exchanger.