Introduction: The Importance of Walnut Drying
Walnuts, often hailed as a “superfood,” are rich in unsaturated fats, protein, vitamins, and minerals. However, freshly harvested walnuts have high moisture content, making them susceptible to mold, rancidity, and nutrient loss. Proper drying is essential to reduce moisture to a safe level (around 10%), extend shelf life, preserve their natural flavor and nutritional value, and ensure they meet market standards for quality and safety.
Why Choose MeiYa Heat Pump Dryers for Walnuts?
Traditional drying methods—such as sun drying, coal-fired heating, or conventional electric drying—are often inefficient, costly, and inconsistent. MeiYa’s advanced heat pump technology offers a superior alternative:
- Significant Energy & Cost Savings
MeiYa heat pump dryers can reduce drying costs by up to 60% compared to traditional electric heating methods. By efficiently extracting heat from ambient air, they consume far less electricity while delivering consistent performance. - Precise Temperature & Humidity Control
Walnuts require careful temperature management to avoid cracking, discoloration, or loss of oils. MeiYa dryers maintain exact temperature ranges (30°C–70°C) and automatically adjust humidity levels, ensuring uniform drying without over-drying. - Fully Automated Operation
Once parameters are set, the system operates autonomously, eliminating the need for constant manual monitoring and reducing labor costs. - Hygienic & Environmentally Friendly
The closed-loop drying chamber prevents contamination from dust, insects, or fumes. With no combustion involved, MeiYa dryers produce zero emissions, supporting sustainable and clean production. - Weather-Independent & Reliable
Unlike sun drying, MeiYa dryers operate consistently regardless of outdoor conditions, enabling year-round, high-volume processing.
Step-by-Step Walnut Drying Process with MeiYa Dryers
Step 1: Preparation
- Selection: Choose mature, undamaged walnuts. Remove any debris or defective nuts.
- Loading: Place walnuts in single layers on stainless-steel trays to ensure even airflow. A standard 25 m³ drying chamber can hold approximately 1,200–1,500 kg per batch.
Step 2: Three-Stage Drying Cycle
Stage 1 – Initial Dehumidification (Temperature: 30–35°C | Duration: 12–15 hours)
- Objective: Remove surface moisture and prevent mold formation.
- Process: The dryer circulates warm air without active heating to gently evaporate excess water. The walnut shells will gradually change from dark brown to a lighter brown.
Stage 2 – Color Setting & Primary Drying (Temperature: 50°C | Duration: 12 hours)
- Objective: Fix the color and reduce internal moisture.
- Process: Temperature is raised to 50°C. At this stage, the kernels become partially dry (about 70% dryness) and retain their natural color. When cracked open, no visible moisture should be present.
Stage 3 – Gentle Kernel Drying (Temperature: 30°C | Duration: 16 hours)
- Objective: Slowly reduce moisture to the target level (≈10%) without damaging the kernels.
- Process: Temperature is lowered to 30°C for slow, even drying. This preserves the walnut’s delicate oils and texture. After drying, cover the walnuts with cloth to allow residual moisture to equalize.
Total Drying Time: Approximately 40–43 hours.
Step 3: Quality Check & Packaging
- Moisture Test: Kernels should reach ≈10% moisture content.
- Visual & Texture Check: Shells should be uniformly colored; kernels should be crisp and easily separated from the shell.
- Cooling & Packaging: Allow walnuts to cool naturally before packing in moisture-proof bags or containers.
Traditional vs. MeiYa Heat Pump Drying: A Quick Comparison
| Aspect | Traditional Methods | MeiYa Heat Pump Dryers |
|---|---|---|
| Energy Source | Sunlight, coal, or electricity | Ambient air heat + minimal electricity |
| Temperature Control | Unstable, risk of overheating | Precise (±2°C), multi-stage control |
| Drying Time | 5–7 days (weather-dependent) | 40–43 hours, consistent |
| Operating Cost | High (fuel/electricity intensive) | Up to 60% savings |
| Labor Need | Constant monitoring required | Fully automated |
| Product Quality | Risk of mold, uneven drying | Uniform color, preserved nutrients |
| Environmental Impact | Pollution, contamination risks | Zero emissions, clean process |
Conclusion
MeiYa heat pump dryers provide a reliable, efficient, and eco-friendly solution for walnut processing. By combining advanced technology with precise control, they ensure high-quality dried walnuts with minimal energy consumption and operational costs.
Upgrade your walnut drying operation with MeiYa—where innovation meets excellence.
Contact Us for a Customized Solution:
📧 Email: [email protected]
👤 Contact: Ray Ren
📱 WhatsApp/WeChat/Mobile: +86 133 4676 7871
MeiYa – Engineering Smarter Drying for a Healthier World.
MeiYa Heat Pump Dryer Machine
- No MOQ & Customization Unlimited
- Drying + Dehumidify + Cooling
- PLC + Touch Screen Control
- 7-10 Days Delivery Time
Parameter:
| Single dryer+drying chamber | ||||
| Model | Unit | MY-03RD | MY-06RD | MY-12RD |
| Power input | KW | 5.5 | 9.5 | 19.4 |
| power supply | V/PH/HZ | 380V/3PH,50/60HZ | 380V/3PH,50/60HZ | |
| 220V/1PH,50/60HZ | ||||
| Rated current | A | 9.6A(380V),22A(220V) | 17.0 | 30.0 |
| Heating capacity | KW | 10.5 | 21.0 | 42.0 |
| Cooling capacity | KW | 7.8 | 18.0 | 32.0 |
| Dehumidity | L/H | 12.0 | 25.0 | 50.0 |
| Max temperature | ℃ | ≤75 | ≤75 | ≤75 |
| Working condition | ℃ | 0-43 | 0-43 | 0-43 |
| Electric shock protection grade | 1 | 1 | 1 | |
| Max exhause pressure | M(P)a | 30 | 30 | 30 |
| Noise | d(B(A | 75 | 75 | 75 |
| Power consumption/H | KWH | 4.8 | 8.5 | 15.0 |
| Electric heater | KW | 3.0 | 6.0 | 12.0 |
| Blowing type | / | HORIZONTAL BLOWING TYPE | ||
| Demsnssion of dryer | MM | 1650*856*1280 | 1806*1065*1280 | 2089*1260*1580 |
| Weight | KG | 180 | 285 | 480 |
Buying Guiding:
Recommend drying machine+Drying chamber sizes
| Model | Description | Drying Capacity (Per Batch) | Drying Room Size (mm) | Trolleys Number | Trays Number |
| MY-01RD-16L | All-in-one Machine | Up to 100Kg | All-in-one | 16 | |
| MY-01RD-36L | All-in-one Machine | Up to 250Kg | All-in-one | 36 | |
| MY-03RD-60L | All-in-one Machine | Up to 400Kg | All-in-one | 60 | |
| MY-03RD | 1 Unit + 1 Drying Room | Up to 700Kg | 3200*2190*2200 | 8 | 128 |
| MY-06RD | 1 Unit + 1 Drying Room | Up to 1,300Kg | 6150*2190*2200 | 14 | 224 |
| MY-12RD | 1 Unit + 1 Drying Room | Up to 2,000Kg | 6350*3230*2200 | 20 | 320 |
| MY-15RD | 1 Unit + 1 Drying Room | Up to 2,200Kg | 6350*3230*2200 | 20 | 320 |
| MY-03RD (Double) | 2 Units + 1 Drying Room | Up to 1,700Kg | 7050*2190*2200 | 16 | 256 |
| MY-06RD (Double) | 2 Units + 1 Drying Room | Up to 2,500Kg | 10100*2190*2200 | 24 | 384 |
| MY-12RD (Double) | 2 Units + 1 Drying Room | Up to 4,400Kg | 11860*3230*2200 | 40 | 640 |
| MY-15RD (Double) | 2 Units + 1 Drying Room | Up to 5,200Kg | 11860*3230*2200 | 40 | 640 |
| MY-25RD (Double) | 2 Units + 1 Drying Room | Up to 10,000Kg | 13520*6070*2200 | 48 | 1920 |
Our Projects:
Our Factory:
Production Processing:
Drying Machine Components:
Standard Working Modes:
- Typically 3 modes available:
- Drying Only
- Rapid temperature rise; unable to discharge moist air
- Drying + Dehumidify
- Chamber temperature rises while discharging moist air
- Cooling
- Temperature can drop to 10°C (minimum)
- Important Note:
- If temperature control becomes unstable, switch to Temperature & Humidity Mode.
- Drying Only
Ray. Ren | Sales Manager
GUANGZHOU MEIYA ELECTRIC EQUIPMENT TECHNOLOGY CO., LTD.
📍 Add: No.217, 2nd Ruiyun Road, Xiuquan Street, Huadu District, Guangzhou, Guangdong, China
📞 Tel/WhatsApp/WeChat: +86 133 4676 7871
✉️ Email: [email protected]
🌐 Website: https://www.my-dryer.com
