Temperature uniformity
A wide spread inside the room dries unevenly, so hot-air outlets and guiding structures must be laid out to avoid local overheating.
DIANREZHANELECTRIC HEATINGIndustry Solutions中文INDUSTRY SOLUTION · S3
Drying hot air,
to the duty.
Stable hot air for drying rooms, lines and fresh-air systems. Judge velocity, temperature uniformity and staged control.
- Circulating air volume (m³/h)
- Room volume and insulation
- Target hot-air temperature
- Fresh-air make-up volume
- Product temperature limit
- Control and interlock requirements
SCENARIO
Typical duty
Read the process, then the equipment
Drying rooms and lines in food, timber, plating, foundry and chemical-raw-material work heat circulating air or fresh make-up air to process temperature and hold it there. Drying quality depends on hot-air uniformity and circulation efficiency: too hot damages the product, too cool slows the cycle.
Humidity and fresh-air load
Driving out moisture means admitting fresh air, and that load materially raises total power, so it must be sized against the cycle time.
Continuous reliability
Drying is usually a continuous process, so the heating needs staged redundancy and fault alarms to avoid line stoppage.
Control accuracy
Different products need different temperature windows, which normally calls for continuous PID control rather than simple on/off.
SOLUTION PATH
From duty to equipment,
four steps
- 01
Size the hot-air load
Total power from circulating volume, fresh-air volume, temperature rise and room heat loss, splitting the duty between initial heat-up and holding.
- 02
Choose the heating construction
Pick a duct heater or a fan-and-heater unit according to duct or room structure, and set fin density and flow-plate arrangement.
- 03
Design staged control
Switch groups along the load curve and hold temperature with PID or SSR power control; multi-zone rooms can be controlled zone by zone.
- 04
Safety and maintenance
Provide over-temperature protection and fan interlock, leave pull-out clearance for the heated section, and clean dust from the fins on a schedule.
RECOMMENDED EQUIPMENT
Equipment directions
FAQ
Common questions
01The room is not uniform in temperature — what changes first?+
Usually three things: add a flow-straightening plate at the heater outlet, reposition the return-air opening, and match the circulation fan volume. Independent multi-zone control where needed.
02Do we need different equipment for different products?+
Mostly not. Temperature-window differences are handled in the control system. But if the product carries solvent or dust, explosion protection and residue build-up have to be confirmed.
03After a power cut, does it restart automatically?+
Both automatic and manual restart can be configured. Where flammable media are present, manual reset is recommended so the unit cannot start unattended.
INQUIRY PREP
Come prepared,
decide faster on Drying Hot Air
Have these parameters ready — they feed directly into model selection, power sizing and mechanical design review.- Circulating air volume (m³/h)
- Room volume and insulation
- Target hot-air temperature
- Fresh-air make-up volume
- Product temperature limit
- Control and interlock requirements
Other solutions
S1Chemical & process pipeline heatingHeat-up, trace heating and temperature holding for process media. Fix medium, pressure, corrosivity and Ex requirements first.S2Waste gas & VOC treatment heatingWaste-gas pre-heating and duct boosting before catalytic oxidation. Fix air volume, rise, pressure drop and fan interlocks.S4Reactor thermal-oil temperature controlIndirect heating and constant control through a thermal-oil loop. Fix the temperature band, circulation rate and heat consumers.S5Tank & liquid heatingLiquid heat-up through flanged immersion elements or an external loop. Watch level, scaling, material and surface load.S6Hazardous-area electric heatingHeating for flammable or explosive atmospheres: zone, Ex level, temperature class, isolation and over-temperature protection.