This is the most important basis on which the system will be designed. The best way to assess the load from theoretical calculations, tempered by the past experience of technologists and energy auditors. The system should never be designed with uncertain data. Engineers-technologists, if not to know or understand committed in the issues of energy efficiency, may overstate the download or save huge reserves of strength. You should also make sure that all the proposed load will be installed together or for a period of several years. Process changes of load during 24-hour period, a batch cycle time, seasonal variations and others must all be roughly quantified.
Free cooling or cost-effective cooling the best of nature in the form of a cool or cold water from the cooling tower must not be over looked. To the extent possible precool products using natural remedies before using cooling. Consider options such as cooling of building structures, geothermal heat pumps and other
Comfort air conditioning should be minimized as much as possible. Air conditioning only for small areas where it is necessary for the production process. Table 5.1 presents the typical air conditioning requirements in office premises.
Eliminate or reduce the heat whenever possible, especially for low relative humidity applications.
Chillers 
..