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Precision vs. Comfort Cooling: Is Your Cooling Solution Built for Your Needs? Or only adapted to them? Comfort cooling systems consist of central air conditioners in offices and other commercial buildings. They are primarily designed to balance temperature and humidity in order to keep people comfortable. Precision cooling systems are designed to strictly regulate atmospheric conditions within a very narrow range to provide a stable environment for sensitive electronics. Although comfort cooling solutions are initially less expensive to implement, the overall total cost of ownership can be higher than with precision air conditioning both in terms of operational expense and costs associated with increased downtime. People can handle fluctuations in temperature or humidity, but IT equipment cannot. Today’s higher-density deployments have far more demanding requirements than did yesterday’s mainframes. The following list delineates how the cooling requirements for an IT environment are quite different from those for an office environment: 1. Heat load profile Almost the entire cooling load in an IT environment is dry (sensible) heat thrown off by the equipment. Consequently, the air conditioner should primarily cool the air, not lower humidity. The required “sensible heat ratio” for a data center air conditioner is very high, 0.95–0.99. Comfort air conditioners typically have a sensible heat ratio of only 0.65–0.70, which means they remove too much moisture from the air. Continuous rehumidification would be needed to maintain the required atmospheric conditions for IT equipment. 2. Heat load density The heat density of an IT environment may be five times higher and far less uniform than that of a typical office. Precision air conditioning manages the increased load by maintaining a higher sensible heat ratio and operating at a much higher airflow rate¯which means more air is moved through the space to ensure a more even distribution of air and reduce the chances of localized hot spots. 3. Temperature and humidity control Precision air conditioners have sophisticated, fast-acting microprocessor-based controls that react quickly to maintain strictly regulated set-point target temperature (±1°F/±.56°C) and humidity (± 4%) levels. Comfort air conditioners simply are not designed to maintain such precise control over the temperature or relative humidity or to react with the necessary speed to rapidly changing conditions. 5. Year-round operation Precision cooling systems are built to run nonstop, 24/7, 365 days a year¯8,760 hours annually. They are designed to incorporate redundancy and respond to the full range of outside ambient temperatures. Comfort cooling systems are not designed to run continuously or to operate in winter conditions. They are meant for summertime use during normal business hours (9 to 5, five days a week), up to an expected maximum of 1,200 hours per year. Comfort air conditioners quickly lose efficiency and break down under the strain of nonstop operation. 6. Air quality Comfort air conditioners typically employ inefficient residential-style flat air filters, which are inadequate to remove a sufficient percentage of airborne particles. Precision air conditioners, on the other hand, use deep-pleated, higher-efficiency filter banks that sufficiently minimize dust and other particles that can damage sensitive IT equipment. See how we have provided cost-effective solutions for organizations nationwide. Case Studies. In addition, our services include site design and infrastructure planning, construction management, power protection and security planning. For more information E-mail: SalesHelp@mldelivers.com or call (800)-686-5312. Employment Opportunites | Privacy Notice | Return Policy | Shipping Terms | Technical Bulletin |
