Lagring av kyla i bergrum
Undersökning av ett nedlagt oljebergrum
This thesis considers the use of an oldrock cavern as thermal energy storage.With a large system of differentchillers a model was created to find anappropriate future system. There aremainly two trajectories to take. Eitheran installation of chillers needs to bemade or the rock cavern can be used tomeet the future demand of districtcooling in Solna, Sweden. Additionallythis thesis investigates the possibleuse of different techniques to utilizethe phase change energy of water.Simulation shows that it?s possible toutilize the phase-change energy of afluid; however it?s not economicallyfeasible due to the thermodynamiceffects on the Carnot cycle. Further weconsider the possibility of using anexisting rock cavern, earlier used asstorage for heating oil. This indicatesthat a lot of uncertainty is connectedto the use of the rock cavern, mainlydue to the complications of installingequipment inside the cavern. We concludethat the option to use the rock cavernas district cooling is thermodynamicallysuitable, although a more thoroughinvestigation of different solutions toavoid large alterations to the inside ofthe old heating oil storage should bemade.