Ice and swimming halls annually consume lots of energy and produce significant amount of potential waste heat in Finland. In this paper, utilization of four possible waste heat sources (ice refrigeration, dehumidification of air, Gray water and exhaust air) is studied by simulating combined energy system of ice and swimming halls locating in Helsinki. Four cases were simulated including the reference case, one case with waste heat recovery and two cases with both waste heat recovery and two different exhaust air heat pumps. In addition, thermal energy storage tanks are used to store the excess waste heat from the ice hall, while the high temperature exhaust air heat pumps can raise the waste heat temperatures for all heat demands. The results show that up to 99% of the purchased district heat can be replaced by the waste heat in the ice hall at the cost of only 9% purchased electricity increase. The combined utilization of excess heat transferred from the ice hall and the waste heat from the swimming hall can result in 72% reduction of purchased district heat and 37% electricity demand increase in the swimming hall. In the combined energy system of the studied ice and swimming hall, altogether 77% waste heat is utilized, bringing in 82% purchased district heat decrease and 25% electricity increase, while the total consumed energy reduced by 42%. In addition, the total annual energy cost savings reach 133 k€ (-29%), while the saving of the energy cost of the combined system can make up the maximum cost of the profitable investment. During three repayment periods (7, 10 and 15 years), the energy cost savings and maximum cost of profitable investment for the ice hall alone and combined ice and swimming halls are between 510 k€ and 970 k€ and between 700 k€ and 1 580 k€, respectively.

在芬兰，冰场和游泳馆每年消耗大量能源，并产生大量潜在的废热。本文通过模拟位于赫尔辛基的冰场和游泳馆的联合能源系统，研究了四种可能的废热利用（冰制冷，空气除湿，灰水和废气）。模拟了四个案例，包括参考案例，一个废热回收案例，两个废热回收案例和两个不同的排气热泵案例。此外，热能储罐用于存储来自冰场的多余废热，而高温排气热泵可以提高所有热量需求的废热温度。结果表明，制冰厅中的废热可以替代多达99％的所购地区供热，而购电仅增加9％。冰室传递的多余热量与游泳馆的余热相结合，可以减少购买的区域热量72％，游泳馆的用电量增加37％。在所研究的冰与游泳馆的联合能源系统中，总共利用了77％的废热，带来了82％的购置区域热量减少和25％的电力增加，而总能耗减少了42％。此外，每年节省的总能源成本达到133 k€（-29％），而节省组合系统的能源成本可以弥补获利投资的最大成本。在三个还款期（7，