Precision Air Conditioning (PAC) system controls the environment, providing a constant temperature and humidity conditions for sophisticated, expensive and sensitive electronic equipment throughout the year. PAC HVAC systems are designed for cooling datacentre, server room environments and other "technology rooms" rather than one designed for general building (homes, commercial offices and retail). Precision Air Conditioning systems typically offer superior design and reliability and have a high ratio of sensible-to-total Cooling Capacity.
In datacenters IT hardware produces a concentrated and unusual heat load and at the same time, it is a lot sensitive to changes in temperature or humidity. A temperature and/or humidity swing can create problems and sometimes even complete system interruption.
Precision air systems are designed for near temperature and humidity control.
Standard comfort air conditioning is badly suited for technology rooms, leading to system shutdowns and component failures. Because precision air conditioning maintains temperature and humidity within a very narrow range, it provides the environmental stability required by sensitive electronic equipment, allowing your business to avoid expensive downtime.
Precision environmental control requirements now reach far beyond the confines of the traditional data center orcomputer room to encompass a larger suite of applications, referred to as “Technology Rooms”.
Typical technology room applications include:
- Medical equipment suites (MRI, CAT scan)
- Clean rooms
- Printer/copier/CAD centers
- Server Rooms
- Hospital facilities (operating, isolation rooms)
- Telecommunications (switch gear rooms, cell sites)
The maintenance of the temperature and humidity design conditions is critical to the smooth operation of a technology room. Design conditions should be 72-75°F and 45-50% relative humidity (R.H.). As damaging as thewrong ambient conditions can be, rapid temperature swings can also have a negative effect on hardware operation. This is one of the reasons hardware is left powered up, even when not processing data. Precision air con-ditioning is designed to maintain temperature at ±1°F and humidity at ±3-5% R.H. 24 hours a day, 8760 hours a year.
In contrast, comfort systems are designed to maintain 80°F and 50% R.H. only during summer conditions of 95°Fand 48% R.H. outside conditions. There is usually no dedicated humidity control and the simple controllers cannot maintain the set point tolerance required for temperature, allowing potentially harmful temperature andhumidity swings to occur.