HumEvap MC3 Cools OptEvent AHU
JS Humidifiers’ HumEvap MC3 evaporative humidifier has been selected by AHS (Air Handling Systems) to provide evaporative cooling in the innovative OptEvent™ air handling unit. The humidifier cools the return air with low energy cold water humidification in this packaged heat recovery system that has been independently verified by BSRIA.
Working on behalf of a leading and progressive London children’s hospital, AHS was tasked to develop a packaged liquid-coupled heat recovery system to meet the hospital’s demands for hygiene, comfort and energy efficiency. The result was OptEvent™ which packages a HumEvap MC3 with an AHU and includes a pre-programmed ECM (Energy Control Module) that constantly ensures the minimum amount of energy is used to meet the air requirements.
As return air passes through the HumEvap MC3, moisture is absorbed by the air and it is adiabatically cooled to as near 16°C as possible. This humid cool air is then used to chill the incoming fresh air with the use of a heat recovery system. By pre-cooling the incoming fresh air in this way substantial savings in energy costs can be achieved compared to compressor drive technology. The system has been independently verified by BSRIA whose testing of the technology supported AHS’s claims for energy recovery of up to 90% in winter and 40% in summer.
AHS was confident that the HumEvap MC3 would meet the OptEvent’s™ stringent energy efficiency specification. Wes Campbell, technical director, commented: “Air Handling Systems and JS Humidifiers have a long track record in working closely together. The HumEvap is a simple but very versatile humidifier and its cooling capability was a vital ingredient in the development of the OptEvent™.”
The HumEvap MC3 has a modular design and can deliver over 500kg/hr of moisture to an AHU from a single unit operating on just 550W. As 680W of evaporative cooling is provided for every 1kg of moisture absorbed by the air the potential for low cost cooling is massive.
As the water evaporates instantly from the humidifier, there are no aerosols or absorption distances to accommodate inside the AHU. This allows the HumEvap MC3 to be fitted in very short sections without any danger of humidity wetting-out on ducts.
Hygienic operation of the humidifier is assured through the use of drain and purge cycles. By preventing water from remaining in the system, bacterial growth is limited. These cycles are adjustable depending on use and water quality to minimise water consumption. For added protection, the evaporative matrix is impregnated with silver, which has a powerful antibacterial action and there is an optional silver ion dosing system and UV sterlisation.
JS Humidifiers supplies an extensive range of cold water and steam humidifiers, as well as bespoke solutions, for all commercial and industrial applications. JS’ in-house project management division can also provide a smooth, hassle-free installation service that walks the customer through from design specification to post-installed product training.