The possibility of waste heat utilization was examined for the purpose of heating the ventilation

air in one of GE Healthcare Lindesnes' industrial buildings. This particular building has a high

air flow rate, resulting in a total energy consumption of 5,3 GWh. Total potential of waste heat

available is 23 GWh, equivalent to 1 thousandth of Norway's total waste heat potential. This

study is unique due to the use of low grade waste heat water at 17C. In addition it is examined

how economically benecial it is to utilize waste heat water at 17C to achieve 16C ventilation

air. Two solutions were examined, where one modies the 11 existing ventilation units, and the

other solution implements 2 new ventilation units to preheat the inlet air. In order to correctly

assess the amount of heat covered, examination of weather conditions and a self-developed simulation

of heat exchangers' performance were used. Furthermore, dialogue with representatives

from GE Healthcare Lindesnes and different heat exchanger suppliers contributed with essential

specifications in order to solve the problem. Achieved payback time for the modified solution

is 1,1 years, whereas the other solution only achieved 4,0 years. Due to GE's requirement of 1

year payback time, in which the modified solution is slightly above. However, with funding from

Enova, it is possible to fulfil this requirement. Amount of waste heat utilized is 5,3 GWh and

1,09 GWh respectively. Modied solution provides a 99,3% coverage of the heating demand,

and decreases CO2 emmisions by 427 tonnes per year. In addition the modied solution has an

achieved annual saving of 861 000 NOK and lower initial- and operational costs than the other

solution. In a long term perspective, it will be economically favorable to install 11 new finned

tube heat exchangers, because of an even lower operational cost.