Bergkyla och bergvärmeutredning för industrilokalen Rödbergsmyran 5 i Umeå, Västerbotten.

Sammanfattning: Grubbe Ventilation AB is a sheet metal and ventilation company who provides design, installation, service, and repair of ventilation. The company is expanding their business by building a new facility in Umeå, Västerbotten. The property is designed to be used for both office and industrial work. Grubbe Ventelation AB has not yet decided upon wish system which is to be established to provide the building with heating and cooling. The consulting firm Umeå Projekt Team has therefore been asked to investigate the possibilities to invest in geothermal- heating and cooling. If the investigation of a geothermal heating- and cooling system would provide favorable results it would be a very appropriate alternative that provides energy at low costs and are an environmentally friendly option as the energy comes from stored solar energy in the ground is provided by stored solar energy in the ground. The facility ´s heating and cooling consumptions are calculated in the program BV2 and the result indicate a heating demand of 185 000 kWh per year due to thermal transmittance, transmission losses, heating of warm water and a cooling requirement of 5500 kWh. Three different systems of geothermal heating and cooling were tested in the computer program Energy Earth Design. The results show no difference in the dimensioning of the drill hole if merely heating were to be used or both heating and cooling were to be established. The only alteration in the investment is therefore the additional cost of the cooling machine. The geothermal heat pump is designed to cover 60-70 percent of the maximum heat demand of the facility. The additional 30-40 percent will be covered by additional heating. A geothermal heat pump of 40 kW who require a 30 kW electrical heater to cover additional heating would be appropriate for this project. An investment of geothermal heating and cooling would require five bore holes of 210 meters wish provide an investment cost of 307 050 sek for the boreholes and an total investment of 446050 sek with a pay-off time of 5,6 years without cooling and 471050 sek with cooling wish give a pay-off time of 5,9 years. If a special double U-piping were to be used only four boreholes would be required of 250 meters. That would give a total investment cost of 459240 sek and a pay-off time of 5,8 years.