Energikartläggning & optimering av energisystem : En utredning gällande förbättringsåtgärder av centralkökets energisystem vid Västerås sjukhus

Sammanfattning: Methods for reduced energy consumption is a current subject due to ongoing climate changes and therefore a current matter in the global discussion. Policies and propositions are developed on both a global and national level, in order to decrease the overall consumption. The global target which embraces the reduction in use of energy affects industries and buildings to practice a more energy efficient usage, as well as developing efficient systems for heat recovery. This project investigates the potential in energy efficiency in a food manufacturing facility who serves Västerås central hospital. The buildings use of energy is calculated as an active heat balance, including ventilation, transmission and unintended ventilation losses. The active heat balance is used as a reference where the percentual energy reduction followed by application of the energy efficient suggestions is calculated, hence, suggestions for energy efficient actions are presented. Energy efficient and economical sustainable suggestions are developed along with the obtained information from visits on-site as well as through discussions with the operating manager. The suggestions contain operation improvements, renovation and upgrades of technical devices. The main focus of the study addressed the buildings heat consumption in both cooled and heated areas.  The suggestions were presented in terms of life cycle cost analysis to display whether the improvement is economical sustainable. It is shown that if all of the suggested improvements are implemented, the reduced energy use for heating could be decreased by 24.5 %. The economic analysis shows that all suggested actions are more cost efficient than the current building and hence considered as profitable. Discussion regarding the proposed actions and the locally developed claim for energy efficient actions were reviewed. The discussion illustrates advantages and disadvantages regarding different kind of heat exchangers as well as how additional isolation in walls affects the buildings heat balance. In conclusion, the results of the suggested actions are discussed and however they are appropriate for the investigated facility.