|Keywords:||LCC; livscykelkostnad; energi; komfortkyla; kyla; kontor; sorptiv; borrhål; kylton; evaporativ; luftburen; vattenburen|
|Full text PDF:||http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2915|
The use of air-conditioning and comfort cooling in offices and stores has been increasing during recent years. Adnot, (2002) reports an increased use in commercial buildings by 200 % from 1990 to 2002. The increase is primarily due to the growing use of electrical equipment generating internal heat. The enhanced public demands of the indoor climate are yet another explanation to the increase. The main cooling method used is mechanical chillers based on vapor compression. Many of these cooling systems are old and will shortly become obsolete which gives the property holder a chance to improve in his cooling system. The office building Mercurius 12 in Karlstad operates activities that require comfort cooling. The cooling method used is conventional vapor compression which is distributed by an airborne system. The property consists of two buildings one built in 1939 and one in 1970. The property is 7700 m<sup>2</sup> and accommodates one apartment, offices and stores. The property is currently housing 190 people. The aim of this report is that on a basis of life-cycle costs analyze how a change of cooling methods and cooling needs are connected to the Life-cycle costs of the cooling. The practicability of each change shall also be investigated. The calculation of the life-cycle costs and heat surpluses have been made using generally accepted formulas that has been outlined in Excel. All of the simulated measures to reduce the building's life-cycle costs in terms of internal heat and solar radiation pays off. The higher energy prices, the greater savings. The Cooling tower method is the chilling process that provides the minimum life-cycle costs, both with both air and waterborne distribution system. Vapor compression used with today’s energy prices provides comparatively to the other investigated methods a low life-cycle cost. The vapor compression method is however not as good if the energy price would get higher than today.