How To Control Humidity In Clean Room

Whether your accent is on pioneering engineering, developing life-saving drugs or managing the integrity of sensitive documents or artifacts, maintaining the perfect environmental envelope is vital to your success.

Require tight control over temperature and humidity
Accept large swings in cooling requirement daily & annually
Must dehumidify when fiddling or no cooling is required

What Type of HVAC Provides Precision Air Control for Low Load Applications?

Applications that crave both temperature and humidity control must use equipment that is capable of cooling, heating, humidifying and dehumidifying modes. The most effective way to accost this demand is to provide one slice of equipment that provides all those modes of operation. If the load in the space is large, over twoscore or 50 tons, a custom bundle unit can provide this function.

It tin can be challenging, withal to find equipment in smaller tonnages that can do the job. In response to this, engineers often attempt to utilize Computer Room Air Conditioners (CRAC) equipment in laboratories, libraries, archives, and medical imaging rooms that take lower cooling requirements. CRAC units provide all the modes of operation needed and they are bachelor in sizes equally minor at ii tons. A deeper look into these applications, notwithstanding, volition prove that standard CRAC units are non suited to these applications.

Standard Computer Room Ac

Cooling runs more than than half the time to absurd the room
Minimal wet removal (eighty-ninety% SHR adequate) needed
Dehumidifies <10% of running time

Highly Variable Cooling Load Rooms

Zero cooling load at times
threescore-70% SHR needed
May have to dehumidify half of the run hours

Design Twenty-four hour period Reasonable Tolerances

Standard CRAC units exercise a skilful task of controlling temperature and humidity when they are required to produce cooling that is at or nearly their maximum capacity. Maximum cooling capacity is called for on days when the outdoor ambient temperature nears its annual maximum and, at the same time, internal heat generation from lights people, and equipment are at their maximum. This condition is known as a blueprint twenty-four hours with a concurrent pattern load in the space. Unfortunately, these weather condition only occur a few hours a yr. The farther the weather condition fall below the above described maximums, the more than difficult it becomes to command humidity in the infinite to within a reasonable tolerance. When the cooling requirements fall much beneath 50% of maximum, the space is ofttimes discipline to wide swings in temperature & humidity that are totally unacceptable to the occupants of the space.

The reason is that the standard CRAC units are not designed to remove a significant amount of humidity per hour. The dehumidification in a CRAC unit is done by the cooling coil. Every bit long every bit in that location is a telephone call from the thermostat to deliver cooling to the infinite, dehumidification happens as a byproduct of cooling downwardly the room. When the thermostat requires that cooling be delivered for 70% or 80% of the fourth dimension, the CRAC unit can keep upwards with the dehumidification requirements in the space. But call back about how few hours per year this requirement exists in rooms that are non data rooms. Substantially, those conditions just exist in the daytime, during the hottest part of the summer.

Agreement Dehumdification and Toll Controls

Dehumidification style, by definition, means removing humidity from the air without sending any absurd air into the space. Since the cooling whorl removes the moisture this means that the CRAC unit must run the cooling and the heating in the unit at the same time.

There are two problems with this. First at that place is merely ½ as much estrus capacity in a standard CRAC unit of measurement as there is cooling capacity. That means the already minimal amount of dehumidification available at full load is cutting in ½. You lot cannot increase the cooling capacity to get more dehumidification. If you lot do, in that location is non enough estrus in the unit to showtime the increased cooling chapters. Cold air would be delivered to the space and the space temperature will begin to drop too low. Unless information technology is hot outside and at that place is a pregnant requirement for cooling from the space a standard CRAC units only cannot achieve the desired humidity setpoint.

The second problem is that heat in CRAC units is provided by electrical resistance heating elements. From a power cost standpoint, this is absolutely the most expensive source of heat anyone can use. In a information room the electric oestrus runs only a handful of hours a year so this is not an result. In other applications though, the electric rut runs hundreds or even thousands of hours per year while in the dehumidification mode.

These problems are especially acute in laboratories, athenaeum, libraries, make clean rooms, dry out storage and other applications that require that humidity exist controlled in the absence of a demand for cooling.

Small make clean rooms are usually rooms surrounded by a infinite that already has temperature, but not humidity control. Like an annal, in that location is very little need to cool the infinite and the chief mode of operation is dehumidification. Laboratories, libraries, museums, MRI suites, CT scan rooms, art vaults and many other applications face the same claiming, dehumidification is needed more than cooling is needed.

Interpret the Temperature and Humidity Needs of Your Infinite with an All-In-Ane HVAC

Information Aire has solved these challenges past introducing InterpretAire^TM, a packaged cooling, heating, humidifying, and dehumidifying unit that has all of the advantages of a standard CRAC unit and none of the drawbacks. The thing that sets InterpretAire^TM apart from the competition is its power to dehumidify when there is no need for cooling. Humidifying is relatively straightforward and piece of cake for a standard CRAC to reach. Precise temperature control is not that hard in nigh applications either. In that location are multiple strategies that standard CRAC units can utilise to deliver good temperature control. None of those strategies allow the CRAC unit to evangelize better dehumidification command.

The Data Aire InterpretAire climate management system can exist programmed to maintain constant temperature and humidity within a laboratory, make clean room, museum, library or archive to ensure a desired outcome. Consistency and precision were central drivers in the development of the InterpretAire solution. InterpretAire quite literally interprets the needs of the space, and maintains the unique temperature and humidity perimeters mandated for high-accuracy standards.

Your application needs are specific; your ecology control equipment should exist, too.

Learn more most special constant environments and depression load applications.