A small dehumidifier might get a northern rink through winter. Down south, we've seen the same "save money" approach play out too many times: ice surface turns white, fog fills the arena, ceiling starts dripping, ice quality drops, customers complain.
A 600 ㎡ rink in Guangzhou is dealing with air that carries two to three times more moisture than the same rink in Beijing in July. Without proper dehumidification, the moisture condenses on every cold surface in the building — and the ice is the coldest one.
South China (high humidity): 4–6 kg/h per 100 ㎡ of ice surface
Central China / East China: 2–3 kg/h per 100 ㎡
North / dry regions: 1–2 kg/h per 100 ㎡
For a 600 ㎡ rink in Shenzhen, that's 24–36 kg/h of dehumidification capacity minimum. A portable household unit gives you 0.5 kg/h. You can do the math.
1. Dehumidifier must link to the refrigeration control system. We run everything through a PLC (Siemens S7-1200 series) — dehumidifiers, chillers, ice surface temperature control, all on the same controller. Humidity sensors spaced no more than 20 m apart, and the system auto-starts or stops the dehumidifiers when humidity crosses the threshold. No manual intervention. The logic that ties the dehumidifier to the refrigeration start sequence gets hard-coded into the PLC — not configured, not optional, hard-coded.
2. Fresh air intake must be dehumidified first. A lot of projects get this wrong. They pull outside air straight into the arena, which is just pumping humid air onto cold ice. The correct sequence: fresh air passes through the dehumidification section, hits the target moisture content, then enters the building. Anything else is a humidity leak.
3. Dehumidifier outlet cannot blow directly at the ice surface. The dry air coming out of a desiccant rotor runs warmer than ambient. Point it at the ice and you melt the surface layer. Outlet should face the ceiling or side wall, let the air mix through natural circulation.
4. Replace the desiccant rotor on schedule. Silica gel adsorption capacity drops over time. Standard replacement cycle is 2–3 years. Skip it and efficiency falls below 60% — at that point you're paying for a machine that barely works. Put it in the maintenance contract.
5. For Shenzhen and Guangzhou projects, dehumidification is not an option line item. It has to be in the budget. Realistic numbers: 600 ㎡ rink, 30,000–60,000 RMB for the dehumidification system. 800 ㎡, 50,000–80,000 RMB. 1,000 ㎡+ gets configured by humidity zone, typically 80,000–150,000 RMB. Try to save this line, and three months later you might lose more than that in three days of forced closure.
Months 4–6: Ceiling metal components start rusting. Rust water drips onto the ice.
First summer: Ice surface fogs over constantly, ice quality drops, customers slip and fall, complaints pile up, you start limiting capacity or closing days.
First year: Ceiling decoration layers absorb moisture and start falling off. Repair cost on that can exceed the price of a dehumidifier.
Long term: Condensation forms inside the building envelope, insulation soaks through and loses R-value, refrigeration electricity costs climb 30–50%.
A dehumidification system for a southern China rink isn't a "nice to have." It's the same category as the chiller — without it, you're not running an ice rink, you're running a humidity problem with a skating surface attached.
We've been designing and building ice rinks in South China for 15 years. If you have a venue under planning or already operating with humidity issues, send the floor plan and the city. We'll size the system and run the numbers.
Beijing Yangsheng Ice & Snow Technology Co., Ltd. | Full-service ice and snow venue design, refrigeration system construction, and turnkey project delivery (yssnow.com)
