I have a cooling system where the condenser has an effect of 131 kW. The text says that the condensor-heat can be recirculated using the ventilaton-system 5 months a year, and that the vent.system is running between 0800-2000 monday to friday. I also have the energi price pr kWh. The cooling-system runs 365 days a year. I'm supposed to find the yearly cost. I have other info like flow/h, and the enthalphies. I don't really know where to start...so it says "the condensor-heat can be recirculated", is that the effect of 131 kW? Anyone?