When a design engineering firm was in need of an environmental control system for a medical company that wanted to automate the packaging of biotherapy reagents, specialist custom environmental control system provider Air Innovations came up with a bespoke solution
The brief for this particular medical company required the environmental control system (ECS) to maintain <3% relative humidity (RH) and 75°F temperature ±2° for the automated packaging of biotherapy reagents, some of which were highly sensitive to moisture and heat.
The medical HVAC system was to be located in an ISO 8 cleanroom space with ambient air from 65–77°F (18.3–25°C) and at 35–75% RH. In addition, some of the packaged items would include liquids that would introduce an evaporative load into the environment prior to the placement of heat seals. The heat sealing equipment would also introduce 400W of heat to the environment.
Finally, the machine would contain a stainless steel, pressurised dry-environment enclosure, air-locked to minimise the introduction of ambient air.
To dehumidify the system to the required conditions, Air Innovations introduced a desiccant dryer with pre-filtered air into the design. Re-circulated air is then returned to the acceptable ambient temperature and passed through HEPA filtration to maintain the cleanroom environment, while the hot exhaust is ducted away from the ECS.
The bespoke environmental control system that maintains relative humidity (RH) and temperature for automated packaging of biotherapy reagents
The system was designed to sit below floor level, although the end location was ultimately moved onto floor level. The air change rate was designed to ensure a recovery time of less than 30 minutes any time after the doors opened.
The key specifications included:
The medical environmental control system controls humidity to desiccant levels and maintains a steady temperature in the ISO 8 cleanroom space. The system also employs HEPA filtration. The solution not only meets all key specifications but also addresses humidity requirements through both the creation of a vapour barrier and the use of return air via a desiccant dryer to counteract internal evaporative loading. It also meets UL standards and features a stainless steel 304 exterior.