Case Study
Advanced Dehumidification System for a University Sports Facility in West Sussex
Overview
Client: University Sports Facility
Industry: Education & Leisure Facilities
Project Overview: In 2024, DST industrial dehumidifiers were installed at a university sports hall in West Sussex to solve persistent condensation issues. The hall, constructed from PVC membrane, suffered from moisture forming on exposed steelwork and supply ductwork.
In 2024, DST industrial dehumidifiers were installed at a university sports hall in West Sussex to solve persistent condensation issues. The hall, constructed from PVC membrane, suffered from moisture forming on exposed steelwork and supply ductwork. The wet surfaces led to slip risks, especially when large groups were using the space. Air quality had also fallen below suitable levels when high occupancy events took place, as carbon dioxide levels were not being diluted adequately. The university required a controlled system that could stop condensation, stabilise internal conditions, and respond to changes in attendance.
The Challenge
The site had several key problems that required a precise approach.
Condensation on structure and ductwork
High humidity frequently pushed dew point above surface temperatures, causing wet surfaces to form. The existing unit could not control dew point effectively.
CO₂ level increases
Concerts and special events regularly attracted up to 300 people. With limited air change, CO₂ rose beyond recommended indoor levels.
Variable usage patterns
Daily sports activities generally involved around 100 people, but occasional events brought three-times the normal attendance. The system had to cope with both conditions.
Challenging ambient values
Worst-case design values included around 13.4 g/kg moisture content in summer.
Limited space for infrastructure changes
Existing ductwork and the installed AHU needed to remain in place. The new solution had to work with the current layout rather than replace it.
The Solution
Following technical assessment, a DST desiccant dehumidification system was selected and configured to manage dew point, humidity and fresh air volumes. The system works in either recirculation mode or fresh air mode, based on occupancy and CO₂ readings.
Dew Point Management
A combined control approach was used. Humidity and dew point were monitored continuously, and the dehumidifier modulated output to keep internal conditions below dew point. This prevented wet surfaces forming on steelwork and ductwork.
CO₂-Linked Ventilation
A CO₂ sensor was installed to track indoor levels. When readings exceed the set limit, fresh air is introduced. Fresh air is dried before entering the space so that ventilation does not increase moisture levels. This maintains safe indoor air values even during large events.
Performance Values
The system was designed around the following specifications:
• Moisture removal duty: 49.8 kg/hr
• Dry air volume: 10,500 m³/hr
• Fresh air provision: up to 4,000 m³/hr
Under normal daily sports use, the system runs largely in closed-loop mode, which helps reduce energy demand. When attendance rises, the system increases processed fresh air while still holding dew point below condensation levels.
Target Internal Conditions
The design delivers around 22°C with 60 percent RH. These values keep the hall comfortable, prevent condensation, and allow air quality to stay within safer limits.
Results
The installed system delivered measurable improvements.
Condensation removed
Surface moisture was eliminated across the hall, including steel beams and ductwork. Slip risks were reduced, and equipment corrosion concerns were removed.
Air quality improved
CO₂ readings stayed within acceptable indoor thresholds even at peak attendance.
Efficient system behaviour
Running predominantly in recirculation mode reduced unnecessary heating demand, while fresh air is only added when CO₂ readings indicate a clear need.
Scalable capacity
The solution supports both standard daily use and occasional events with large crowds.
Summary
The DST system has stabilised the indoor environment within the sports hall by removing condensation risks and supporting good air quality during events. Accurate dew point control, linked ventilation, and an efficient operating strategy have delivered long-term reliability for the site.
Facilities with humidity-related safety concerns, moisture issues on metalwork, or fluctuating occupancy requirements can benefit from a similar approach. DST industrial dehumidifiers provide controlled air conditions for buildings where safety, occupant comfort, and operating reliability are essential.
To discuss a project or to request technical guidance, contact DST Humidity Control.