Green Pepper Drying Solutions in Dak Lak: Breakthroughs with Daxwell Heat-Pump Technology

29/06/2026

Drying Solution for Preserving the Color of Dak Lak Green Peppercorns: A Breakthrough with Daxwell Heat-Pump Technology

Key Highlights:

The Challenge: Overcoming the darkening and quality degradation (Piperine loss) of green peppercorns caused by traditional sun drying or high-temperature drying methods.
Core Technology: Cold drying and closed-loop dehumidification mechanism within the optimal temperature range of 30°C - 50°C.
Daxwell Solution: 24/7 operation during peak seasons, absolute safety against fire and explosion, reduced maintenance costs, and over 50% energy savings.

1. Problem Statement: The Economic & Technical Challenge of Dak Lak Green Peppercorns

Green peppercorns in clusters (before reaching the stage of ripening and oxidation) have become a niche agricultural product offering high profit margins for farmers and cooperatives in Dak Lak. To meet the stringent requirements of export markets such as Europe and Japan, dried green peppercorns must retain their signature emerald green color, plump shape, and authentic pungent flavor (Volatile oils and Piperine content).

Illustration of export-standard Dak Lak green peppercorns — Figure 1: High-quality green peppercorns require a strict drying process to prevent darkening and the loss of valuable essential oils.

However, the biggest "pain point" for processing facilities today lies in the drying process:

Natural Sun Drying: Prone to microbial contamination, entirely weather-dependent, and UV rays cause the peppercorn skin to darken rapidly.
High-Temperature Drying (Coal/Electric Resistance Drying): Drying chamber temperatures often exceed 55°C, breaking down the skin's cellular structure, causing essential oils to evaporate, and turning the green peppercorns into regular black pepper. Coal dust also poses a risk of cross-contamination.

The core technical requirement is: A solution for high-speed dehumidification at a low temperature range (30°C - 50°C) to "lock in" the color and aroma immediately after harvest.

2. Dehumidification Mechanism of Closed-Loop Heat-Pump Dryers

To address this, DeAir recommends integrating a specialized panel drying chamber with the Daxwell Heat-Pump dryer. This technology operates on a closed-loop thermodynamic cycle:

Dehumidification: Air carrying moisture from the peppercorns is drawn by a fan through the evaporator (cold coil), lowering the temperature below the dew point to extract water from the drying chamber.
Closed-Loop Reheating: The dry air (extremely low humidity) continues through the condenser (hot coil) to be gently heated to the 40°C - 50°C range and blown back into the drying chamber.

Daxwell Heat-Pump dryer connected to a panel drying room — Figure 2: The Daxwell Heat-Pump dryer system integrates perfectly with insulated panel drying rooms, creating a micro-climate environment that is completely independent of external weather conditions.

3. Why is Daxwell the Optimal Choice for Cooperatives & Processing Plants?

From an industrial HVAC engineering perspective, investing in the Daxwell line not only solves the product quality issue but is also a solution for optimizing operational expenditure (OPEX).

⚡ Save Up To 50% On Electricity

Instead of wasting energy with electric heating elements, Daxwell recovers thermal energy from the cold coil to the hot coil. This high-efficiency Heat-Pump system provides superior electricity savings compared to conventional resistance dryers.

🛡️ Absolutely Safe, No Fire Risk

Completely eliminates fire hazards associated with coal/wood dryers (due to agricultural dust igniting) or electric resistance dryers (short circuits due to overheating). Daxwell uses no open flames, protecting facility assets and minimizing risks.

⏱️ Durable 24/7 Operation

The pepper season is very short. With standard industrial compressors, Daxwell is designed for continuous 24/7 operation, ensuring that large volumes of raw materials are processed promptly without bottlenecking.

🔧 Reduced Maintenance Costs

The closed-loop structure, corrosion-resistant electrostatic powder-coated steel casing, and coil protection filter system ensure the equipment operates stably for years, eliminating the need for constant heating element replacement or kiln reconstruction.

Daxwell Heat-pump dryer connected to a container drying room — Figure 3: Flexible industrial design, easily connected to retrofitted shipping containers, optimizing initial capital expenditure (CAPEX) for cooperatives.

Daxwell dryer PLC HMI screen — Figure 4: Intelligent PLC & HMI control. Easily set multi-stage drying profiles, eliminating errors caused by human intuition.

4. Drying Technology Comparison Table & FAQs

Evaluation Criteria	Coal / Wood Dryer	High-Temp Electric Dryer	Daxwell Heat-Pump
Color Quality	Dark, sooty	Discolored, wrinkled	Emerald green retained
Operating Cost	Average (labor intensive)	Very high (electricity consumption)	Very low (Save >50%)
Safety Level	High risk of fire/explosion	Risk of short circuits	Absolutely safe

Heat-pump dryer placed inside the drying room — Figure 5: The Daxwell dryer (DX-600D) operates safely and stably even when placed directly inside the drying chamber space.

Frequently Asked Questions (FAQ)

Can I use a Daxwell dryer for other agricultural products outside of the pepper season?

Absolutely. Thanks to the wide customizable temperature range (25°C - 80°C depending on the model), the Daxwell dryer is extremely versatile. After the pepper season, you can set up new temperature and humidity profiles to dry macadamia, coffee, medicinal herbs, or various fruits and vegetables for export, maximizing equipment capacity year-round.

Elevate Agricultural Value - Optimize Profit with DeAir

The Daxwell Heat-Pump drying system is not just a piece of electromechanical machinery; it is a "shield" protecting your facility's assets and a "guarantee" for the quality of your exported green peppercorns.

Are you a business or cooperative in Dak Lak and the Central Highlands looking for a safe and economical drying solution? Do not hesitate to contact DeAir's HVAC experts for a free consultation on drying chamber design and CAPEX/OPEX estimates!

📞 Technical Support Hotline: 0933 628 660

🌐 See detailed technical specifications for Daxwell at: deair.com.vn