This calculator is designed to give you the co2 generator run time and amount of co2 needed to bring co2 levels from ambient levels (350 ppm) to desired levels (usually 1500 ppm). However we can not calculate for variables such as how well the garden is sealed, how much co2 is being consumed by the plants, periodic venting, etc. This calculator assumes that the garden is vented once per hour. If there is more venting or air escape than that, the generator might run more often than calculated. If there is less venting or air escape than that, the generator might run less often than calculated. The longer the generator runs, the more heat it will produce, and the greater your cooling requirements will be.
After calculating your co2 needs use the charts below to figure chiller size, reservoir size, or water usage for the various means of cooling. Remember that the recommendations are based on venting once per hour, and you should keep your specific environment in mind. If CO2 escape or venting is minimal, cooling requirements and water usage could be much less, and if there is excessive venting or air escape causing the generator to run excessively you could need more.