SEMCO's EP Series offers the ultimate performance in the transfer of total energy (both latent and sensible). Pre-engineered and factory assembled, the EP Series system also provides the air handling capability for the building's exhaust and supply air. The system can be selected to precondition outdoor air going to other conventional air handling systems or as an integrated system that provides total space conditioning with additional heating and cooling options available.

The heart of this system is a technologically advanced EXCLU-SIEVE® desiccant wheel. In addition to providing superior performance, the wheel's 3Å molecular sieve-desiccant coating is selective in what it adsorbs from an exhaust air stream. The desiccant rejects airborne contaminants while it transfers water vapor, thus providing total energy transfer from the exhaust to the supply air stream. Selectivity allows EXCLU-SIEVE to be used in critical applications, including recovery from contaminated air streams. In the past, energy recovery was avoided or limited to sensible-only energy exchange in applications like these.

The EXCLU-SIEVE wheel uses a fluted media with an aluminum backbone, which is coated with a fast-acting, adsorbent desiccant surface. As the transfer media slowly rotates between the outdoor and exhaust air streams, the warmer air surrenders its sensible energy to the aluminum. This energy is then shifted to the cooler air stream during the second half of the revolution.

Just as the temperature is captured and released, so is the moisture. EXCLU-SIEVE's 3Å molecular sieve-desiccant coating has an enormous internal surface area and strong attraction to water vapor. Since the opposing air streams have different temperatures and moisture contents, the vapor pressure will also be different. This pressure difference is the driving force in the transferring of latent energy.

By using the desiccant coating, EXCLU-SIEVE recovers the moisture from the exhaust air stream to the supply air stream without the airborne pollutants exchanging. This very important and unique feature has been well documented through independent laboratory and field-testing.