With the very cold temperatures in the upper Midwest, ventilation systems in many production facilities are operating at their minimum levels. While these levels were supposedly sized and designed based on moisture removal rates, many producers struggle with wet pens this time of year. Another common complaint is higher than expected ammonia levels at specific locations within a facility.
The solution many producers use to correct these complaints it to increase the amount of minimum ventilation, generally by speeding up the variable fans on stage 1 in their controller. While this may resolve the problem, the increased ventilation rate always increases the heat removal from the facility and the resulting propane usage.
In a large number of cases the problem with minimum ventilation isn’t the rate (or minimum speed setting in the controller). Rather, it is the inlet settings.