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In industrial processes, drying plays a crucial role – both for product quality and energy consumption. Ventless drying from HARTER stands for maximum efficiency, reproducible results, and utmost cleanliness. Thanks to innovative heat pump technology, heat and moisture are retained within the system, ensuring no energy is lost to the outside.
The result: a controlled, environmentally friendly process with constant conditions – regardless of room climate, season, or ambient air.
How HARTER develops such customized solutions is shown in: How Solutions for Heat Pump Dryers are Created.
The physical principles are described in: Energy-Saving Drying with Heat Pumps.
Do you require a custom solution and/or would you like to test the drying process beforehand?
Development with practical tests in our in-house development center
We are an innovation-driven team and welcome new challenges. HARTER tests your custom solution in the technical center under realistic conditions, optimizes the parameters, and documents the results transparently. Please contact us – we would be pleased to provide you with a non-binding consultation!
Drying systems
in over 20 countries stand for our quality
Employees
from all areas ensure a high level of vertical integration
Years of experience
in the development of innovative drying systems
Ventless Drying – Principle and Advantages
In ventless drying, the process air is circulated in a closed loop. The air is continuously dehumidified, tempered, and returned to the drying chamber. This keeps the system completely independent of the environment – an advantage for consistent quality and high energy efficiency.
The HARTER Principle:
- Dehumidification and heating of process air via heat pump
- Circulation in a closed loop without exhaust air
- Condensation of moisture within the system
- Utilization of recovered heat for the next cycle
Your Benefits:
- Up to 70% energy savings compared to hot air systems
- No heat loss, as no exhaust air is generated
- Clean, hygienic process without dust or particle ingress
- Uniform drying even in complex geometries
- Low temperatures (30–75 °C) – ideal for sensitive products
- Independent of climate and season
With this technology, moisture is efficiently removed without energy or air masses being lost. This reduces operating costs while simultaneously improving production conditions.
Ventless
Ventless Drying Systems
Ventless Drying – Applications and Industries
Ventless drying is suitable for almost all industrial sectors – wherever reproducible quality and energy efficiency are required.
HARTER develops customized systems for every application, from food production to electroplating.
Typical Application Areas:
- Food Industry: Fruits, vegetables, herbs, snacks, protein products
- Pharma and Chemical: Powders, granules, sensitive active ingredients
- Surface Technology: Adhesive water drying, electroplating, cleaning
- Environmental Technology: Sewage sludge, filter cake, residues
- Material Processing: Plastics, composite parts, metals
System Variants:
- Chamber dryers / Tray dryers for batch processes
- Belt dryers for continuous productions
- Special systems for cleanroom or special applications
Before each design, HARTER tests your original products in its in-house technical center. Temperature, air flow, bed height, and target residual moisture are precisely determined and documented. This results in a validated process with maximum energy efficiency and product quality.
An overview of related application areas is provided by: Industries.
We dry with dry air and deliver it to the right places: A perfect interplay of air preparation and air guidance provides you with the best possible drying result.
Reliable – Competent – Long-term
Service that thinks ahead – for years to come
With the HARTER After-Sales Service, you secure a reliable and efficient drying solution for the long term. Whether it’s maintenance, spare parts supply, or technical adjustments – we support your system throughout its entire life cycle and ensure that it delivers optimal results at all times.
Ventless Drying – Sustainability, Energy Efficiency, and Economic Viability
Ventless drying symbolizes sustainable production. Since no exhaust air is discharged, the heat remains within the system – this saves energy and significantly reduces CO₂ emissions.
Sustainable advantages:
- Up to 70% energy savings through a closed loop
- No exhaust emissions and thus no exhaust air treatment required
- Compact design → less space required
- Low operating costs through heat recovery
- Eligible technology according to energy efficiency guidelines
The systems are low-maintenance, durable, and can be easily integrated into existing production lines. Optionally, digital process monitoring, data logging, and automatic humidity control are available – for consistently stable results.
How HARTER implements such processes in various industries is shown in: How Solutions for Heat Pump Dryers are Created.
What our customers say
“Sometimes it is better to say nothing and let your customers speak for themselves.”
– Regina Mader, Managing Director
FAQ – Frequently Asked Questions about Ventless Drying
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Brochures, technical reports, and press articles for those who want to know more details.
