1. The problem statement, all variables and given/known data If you had a water-cooled computer that puts out 500W of heat into the loop with a large copper 100 liter reservoir but no radiators, how long can you keep the temperature of the components below 70 degrees Celsius if the initial water and air temperature is 20 degrees Celsius? 2. Relevant equations area x heat transmission coefficient x (water temperature - air temperature) Cube length for 100 liters of water = 0.465m Heat transmission coefficient for water-copper-air = 13.1W/m^2K Room temperature = 20C & maximum water temperature allowed = 70C 3. The attempt at a solution (0.465^2x6) x 13.1 x (70-20) = 849.8W (0.465^2x6) x 13.1 x (70-41) = 493W So 100 liters of water as well as the copper dissipating the heat should keep the water cooled pc components less than or equal to 70C until the room temperature reaches 41C. Is this ok?