BO 01 ATES SYSTEM FOR HEATING AND COOLING IN MALMÖ

Abstract

Newly established residential area in Västra Hamnen (West Harbour) in the city of Malmö uses Aquifer Thermal Energy Storage (ATES) as part of the district heating and cooling system. ATES system has 5 warm and 5 cold wells that are 70-80 m deep. Cold from the nearby sea (¨ Oresund) and water cold from heat pump is stored from winter to summer. The purpose of the system is to deliver free cooling to district cooling system at a temperature level below +6-8 • C. Operational experiences and economic aspects are discussed. The storage is linked to a local district heating and cooling system that serves a newly established residential area in Västra Hamnen (West Harbour) in the city of Malmö (Figure 87). The storage is an essential part of the system that also contains a centralised heat pump and chiller system. Electricity to run the system is obtained from a windmill. In the aquifer a combination of cold from the nearby sea (¨ Oresund) and waste cold from the heat pump is stored from winter to summer. During the cooling season cold is directly delivered to the local DC network. Peak loads are covered heat pump and/or a chiller. The designed cold storage load capacity is 1,300 kW with a turnover of 3,900 MWh/year. The purpose with the Aquifer Storage is to deliver basic free cooling to the DC system at a temperature level below +6-8 • C. This is achieved by storage of evaporator cold at +4.5 • C and cold from the seawater at temperatures below +4 • C. The warm side of the system works with temperatures between +13-and 15 • C. The maximum flow rate is for legal reasons limited to 32.5 l/s (117 m 3 /h). The storage system contains (Figure 88) two groups of wells with a set of heat exchangers in between. There are 5 warm and 5 cold, 8 wells with H. ¨ O. Paksoy (ed.), Thermal Energy Storage for Sustainable Energy Consumption, 235-238. C 2007 Springer. 235