Dak Nong is emerging as the new capital of specialty fruits in the Central Highlands, with its large area dedicated to growing the famous Booth avocado and 034 avocado varieties. Dak Mil, Cu Jut, durian-growing areas are expanding rapidly in Gia Nghia City, Dak Song and large-scale passion fruit farms for export in Dak R'lap, Tuy Duc. However, the situation of "bumper harvest, low prices," with ripe fruits piling up during the peak season and post-harvest losses reaching 251-30% due to a lack of cold storage, is a major headache for cooperatives and export businesses in Dak Nong.
Tan Long Refrigeration and Electrical Engineering Joint Stock Company Providing EPC (Engineering, Procurement, and Construction) general contractor solutions. Cold storage facilities for agricultural products, cold storage warehouses, and specialized deep-freezing tunnels for fruits in Dak Nong.. We apply advanced microclimate control technology, which helps extend the shelf life of our products by 1 to 3 months and meets the standards for official export to China, South Korea, and Europe.
1. The Pain of Post-Harvest Damage to Agricultural Products in Dak Nong
The climate of the Central Highlands is clearly divided into two seasons: rainy and dry. During the harvest season (June to November), daytime temperatures in Dak Nong can reach high levels. 33°C – 35°C accompanied by fluctuating air humidity:
- For Booth avocados and 034 avocados (Dak Mil, Cu Jut): Avocados are climactic fruits. If left at room temperature, they produce a huge amount of ethylene gas, causing them to ripen rapidly, darken the flesh near the stem, and develop black fibers within just 3-5 days.
- Regarding durian (Gia Nghia, Dak Song): Harvesting in hot weather causes the fruit's core to accumulate heat. If the core isn't cooled down quickly, the durian flesh will ferment, the spines at the bottom of the fruit will crack, and it will be attacked by Phytophthora fungus, causing the stem to rot and rendering it unsuitable for export.
- For passion fruit and passion fruit juice (Dak R'lap, Tuy Duc): Fresh passion fruit needs to be stored in a cool place to keep the peel firm and shiny; passion fruit juice needs to be frozen in a deep-freeze chamber ($-35^circ ext{C}$) to solidify into blocks before being frozen for export to Europe ($-18^circ ext{C}$).
💡 Tan Long's two-stage refrigeration technology solution for Dak Nong:
1. Pre-cooling (Cold vault): Rapidly lower the core temperature of the fruit from 32°C to 10°C – 13°C within 4 – 6 hours to inhibit respiration.
2. Cold storage / Deep freezer: Maintaining a precise temperature range of $pm 0.5^circ ext{C}$, controlling humidity at 85% – 90% to prevent dehydration, preserving the freshness of the stem and the firmness of the peel.
2. Technical Specifications Table for Fruit Preservation in Dak Nong
The technical standards for preserving key agricultural products in Dak Nong were compiled by engineer Tan Long based on practical experience:
| Type of produce | Optimal temperature | Relative humidity (RH) | Safe storage time | Special technical notes |
|---|---|---|---|---|
| Booth avocados & 034 avocados in Dak Mil | +6°C to +8°C | 85% – 90% | 25-40 days | Do not let the temperature drop below 5°C to avoid chilling injury. |
| Fresh durian for export | +13°C to +15°C | 85% – 90% | 20-35 days | Forced Ethylene Exhaust Ventilation System |
| Freezing chamber for durian pulp and passion fruit juice | -35°C to -40°C | Convective dry cold | Cycle time: 1-2 hours | Extremely rapid freezing prevents cell membrane rupture. |
| Durian and passion fruit freezer storage | -18°C to -22°C | 85% – 90% | 12 – 24 months | Store in specialized stainless steel trays and shelves. |
3. Industrial Cold Storage Equipment Configuration Proposed by Tan Long
- Imported compressor unit: Use a compressor unit. Bitzer (Germany), Mycom (Japan) or Copenhagen Smooth operation, exceptional durability exceeding 15 years, equipped with pressure and overcurrent protection sensors.
- Tan Long PIR insulated panel casing: With a thickness of 100mm (for chilled storage) and 150mm (for frozen storage), a density of 42-45 kg/m³, meeting fire resistance standards B1/B2 according to QCVN 06:2022/BXD, and featuring tight-fitting Camlock interlocking joints to prevent heat loss.
- Exclusive T-Light cold storage doors: 304 stainless steel casing, 4-way anti-condensation heating element, double EPDM rubber gasket for excellent elasticity.
- 24/7 SCADA/IoT control system: Automatically adjusts power output according to actual load, connects to your phone for remote alerts when the temperature exceeds safe limits.
4. Estimated Price List for Cold Storage in Dak Nong (B2B)
| Capacity | Warehouse volume | Recommended computer configuration | B2B Technical Estimate |
|---|---|---|---|
| Cooperative produces 10-30 tons of avocado/durian. | 60 – 180 m³ | Bitzer/Copeland semi-enclosed unit, 100mm PIR panel, T-Light stainless steel hinged door. | The price will be calculated based on the floor plan and the location of the outdoor unit. |
| Wholesale businesses with a capacity of 50-150 tons | 300 – 900 m³ | Screw compressor unit, High-capacity evaporator, 125-150mm PIR panel, Sliding door | Prepare technical design documents and Bill of Quantities (BOQ). |
| The factory exports 300-1,000+ tons. | 1,800 – 6,000+ m³ | Parallel Mycom/Bitzer compressor station system, -40°C deep freezing chamber, SCADA Cloud. | Turnkey EPC general contractor |
👉 Commitment to supporting the local community: Tan Long's engineering team is present in Dak Mil, Gia Nghia, Cu Jut, Dak Song, and Dak R'lap. 24-48 hours To conduct a survey and develop the optimal solution.
5. Proof of Tan Long's Practical Project Capabilities
- Automated warehouse general contractor NECS (102,642 pallets) and AJ Total (31,000 pallets).
- Construction of cold storage and freezing tunnel complexes for agricultural products for leading partners: Nutifood, Saigon Food, Vietnam Communist Party.
6. The 7-Step Process for Implementing Cold Storage for Agricultural Products in Dak Nong
- Conduct a site survey of the factory, container transport routes, and inspect the 3-phase transformer substation.
- Calculate the thermodynamics and create a 3D perspective drawing of the convective airflow within the warehouse.
- Prepare a detailed technical cost estimate and provide a guarantee of origin (CO/CQ) for all materials.
- Manufacturing of fire-resistant PIR panel enclosures and T-Light cold doors at Tan Long factory.
- Transporting the panels to Dak Nong and installing them, including high-pressure copper pipe welding.
- Vacuum the room, charge the refrigerant, adjust the expansion valve, and perform a test run to lower the room temperature.
- Handover, transfer of operating procedures and activation of the 24/7 warranty policy.
7. Frequently Asked Questions When Installing Cold Storage in Dak Nong (FAQ)
1. Can I store both avocados and durians in the same cold storage room?
Durian should not be stored in the same room if it starts emitting a lot of ethylene gas, as ethylene will accelerate the ripening and spoilage of avocados. Tan Long advises designing a partitioned room with panels to create two independent chambers with separate ethylene gas extraction systems to optimize operation.
2. If the three-phase power supply in the agricultural areas of Dak Nong is unstable, will the compressor in the cold storage unit be damaged?
Tan Long's electrical control panels always integrate Schneider/Siemens phase loss, phase reversal, voltage drop, and overload protection relays. If the power supply is unstable, the system automatically shuts off safely and sends a warning to your phone, protecting the compressor coil from short circuits and burning out.
Investment in Cold Storage for Avocado & Durian Export in Dak Nong
Contact Tan Long Engineers today to receive solutions for preserving agricultural products, maintaining their commercial value, and preparing for the new harvest season.
Cold Storage Construction Project in Adjacent Areas of the Central Highlands and South Central Vietnam
Areas specializing in durian, dragon fruit, avocado, coffee, passion fruit for export, and temperate fruits in Da Lat require high-standard cold storage. Tan Long's engineering team is ready to conduct on-site surveys and provide technical support within 24 hours.
Engineer Nguyen Toan Thinh (Technical Director)
With over 18 years of practical experience in directing, consulting, designing, and constructing heavy industrial refrigeration systems, ASRS automated warehouses, and IQF freezing systems across more than 29 major national projects.
