En analys av centralkylan i Slakthusområdet i Stockholm
SlakthusområdetCentralcooling systemCoolingFastighetskontoretBravida TSMSlakthusområdetCentralkylaKylteknikFastighetskontoretBravida TSM
In Stockholm, Johanneshov the Slaughterhouse area (Slakthusområdet) can be found. A number of companies have gathered there providing the Stockholmers with meat products. This area has a great need for cooling to supply large cold storages. To facilitate this, a central cooling system has been built, supplying the area with effective and safe cooling.The aim of this master thesis study is to give hints to energy efficient and reliable changes that can be put in place at a low marginal cost depending on the future activities in the area. The suggested changes will be presented to the company Bravida (managing the system), which also desires a deeper understanding of the energy flows through the central cooling system.Firstly visiting the site with proper guidance, we have then tried to understand the function of the system including which machines and media that are used. We have described the present design and come up with suggestions on how to improve the cooling system for a more efficient and safer cooling. Account has been taken to the fact that the whole area will be remodelled radically, thus the improvements must give a short payback time or have a value even after the remodelling.A conclusion drawn from our calculations is that the efficiency of the central cooling is low. The average COP2(Coefficient of performance in the cooling mode) is around 1,2 which is low. That results in a high electric consumption. Apart from this unnecessarily high water consumption for the cooling tower has been has been observed.We have come up with some ideas to improve the system like:? Enhancing the insulation of the buildings, the pipes and the substation components.? Changing parts in the system like pumps valves and fluids? Introducing a new system for cooling the machines ? a bedrock storage so that the heat can be utilized