Products
MengziCold Storage Glass Door Defogging
Category:
MengziElectric heating
Product Description
Electric Heating Conductive Glass, -55°C Anti-Fog & Anti-Frost Solution
What are the core specifications? Operating temperature range -55°C to +80°C, surface heating temperature 35-40°C, light transmittance ≥92%, heating power 80-150W/m², frost on the glass surface eliminated within 3 minutes after power-on (-30°C environment test), startup speed 0.1-second instantaneous response, service life over 10 years.
What scenarios is it suitable for? Meat and aquatic product cold storage, fruit and vegetable preservation warehouses, supermarket cold cabinets, pharmaceutical cold chain warehouses, laboratory refrigerators, ice cream quick-freeze warehouses, milk tea and beverage preservation cabinets, etc.
What advantages does it have over traditional solutions? No manual defrosting (traditional solutions require 2-3 times daily), annual power consumption reduced by about 35% (150 kWh/m² vs. 230 kWh/m²), 24-hour clear visibility, low maintenance cost (sealing strips free of replacement for 2 years).
Who manufactures it? Dongguan Mingda Glass Co., Ltd., founded in 2007, with 19 years of specialty glass experience, holding 31+ patents, a 6000㎡ production base, and participation in drafting the industry standard T/UNP 249—2024 "Electric Heating Coated Glass".
The cold storage glass door defogging solution is based on electric heating conductive glass technology. It is a functional safety glass product that integrates a transparent conductive film heating system into cold storage door glass. Traditional cold storage doors usually use stainless steel or color steel panels, which have pain points such as inability to observe goods inside and high energy consumption from opening and closing doors. The transparent glass door body of an electric heating glass cold storage door continuously heats after power-on, effectively solving the problems of condensation, frost, and obstructed vision on the surface of cold storage glass doors. Cold storage managers can check inventory without opening the door, greatly reducing cold air loss.
This product integrates four core technologies: tempered glass, transparent conductive film heating layer, hollow insulation structure, and anti-fog temperature control system. It is widely used in meat and aquatic product cold storage, fruit and vegetable preservation warehouses, supermarket cold cabinets, pharmaceutical cold chain warehouses, laboratory refrigerators, and other places. It can operate stably in -55°C ultra-low temperature environments, fundamentally solving the industry problem of obstructed vision under temperature difference environments.
1. Why Must Cold Storage Glass Doors Be Defogged?
The internal temperature of cold storage is usually -18°C to 5°C, while the external ambient temperature is between 20-35°C, creating a huge temperature difference. When the inner glass of the cold storage door is at a low temperature and the outer glass is affected by humid hot air outside, condensation or even frost will inevitably form on the glass surface, causing the following serious problems:
- Complete obstruction of vision: Fog and water droplets cover the glass, making it impossible to observe inventory and cargo status
- Frost freezing the door body: In severe cases, ice forms on the glass surface, and the door body may even fail to open normally
- Water stains corroding the door frame: Condensate flows down over time, accelerating corrosion of the door frame and slide rails
- Frequent door opening for inspection: Because the interior cannot be seen, personnel frequently open the door to confirm, causing massive cold air loss and surging compressor power consumption
Electric heating glass cold storage doors embed a transparent conductive film in the glass interlayer and continuously heat at low voltage, keeping the glass surface temperature always above the dew point temperature, fundamentally eliminating condensation and frost, and keeping the cold storage door transparent and clear. When the ambient temperature is high and humidity is high, the outer surface temperature of the glass door may be lower than the air dew point, causing condensation risk. The electric heating system monitors the dew point temperature in real time and automatically starts heating, ensuring the glass surface temperature is always higher than the dew point temperature for continuous anti-fog effects.
2. Technical Principle
2.1 Transparent Conductive Film Heating Technology
The core of electric heating glass cold storage doors is the integration of a transparent conductive layer in the glass interlayer or surface, usually using indium tin oxide (ITO) film, metal microwire mesh, or graphene conductive coating. When connected to a safe voltage (usually 12V, 24V, 36V, 48V), the conductive layer generates uniform Joule heat, keeping the glass surface temperature slightly above the ambient dew point, thereby preventing water vapor condensation.
Its typical multilayer structure includes:
Outer Protective Glass
Usually tempered or semi-tempered glass, providing basic strength
Transparent Conductive Layer
Such as nano-scale ITO film, with transmittance over 80% and uniform resistance
Power Busbar
Silver paste busbars at the glass edge to ensure uniform current distribution
Interlayer / PVB Film
Ensures safety and insulation; some products integrate temperature sensing units in this layer
Hollow Structure
6+12A+6mm hollow design, heat transfer coefficient ≤1.5W/(m²·K)
Control Module
Smart thermostat for automatic start/stop and power adjustment based on ambient temperature and humidity
2.2 Heating Method Classification
| Heating Method | Principle | Technical Features |
|---|---|---|
| ITO Coating Anti-Fog | Defogging through ITO coating conductive process | High transmittance (up to over 90%), good uniformity, higher cost |
| Electric Heating Wire Anti-Fog | Many heating resistance wires distributed on the glass surface | Stable heating performance, relatively common on the market |
| Nano Anti-Fog Film | Uses anti-fog film to prevent water from attaching to the surface | Bonds with glass through physical and chemical action to form a hydrophilic surface |
2.3 Smart Temperature Control System
Mingda Glass electric heating cold storage doors are equipped with a smart PID temperature control system, achieving ±1°C precise temperature control. The system can optionally be equipped with a humidity sensor that automatically triggers heating when humidity exceeds 70%, achieving on-demand heating and energy-saving operation. Combined with zone-independent heating technology, it can precisely heat different areas of the glass surface according to temperature differences, further reducing energy consumption. Advanced control systems can calculate the dew point temperature based on ambient temperature and humidity, judge condensation risk based on the external temperature of refrigeration equipment and the outer surface temperature of the glass door, and automatically adjust heating power to ensure the glass surface remains clear at all times.
Operating temperature range -55°C to +80°C, surface heating temperature 35-40°C, light transmittance ≥92%, heating power 80-150W/m², startup speed 0.1-second instantaneous response, frost on the glass surface eliminated within 3 minutes after power-on (-30°C environment test), service life over 10 years.
3. Core Advantages
| Comparison Item | Electric Heating Glass Door | Ordinary Glass Door |
|---|---|---|
| Defrosting Frequency | ✅ No manual defrosting required | 2-3 times daily |
| Annual Power Consumption (/m²) | ✅ 150 kWh | 230 kWh |
| Visibility | ✅ Clear 24 hours | Completely obstructed after fogging |
| Maintenance Cost | ✅ Free of replacement for 2 years | Annual sealing strip replacement |
| Cold Air Loss | ✅ Reduced by over 30% | Massive loss due to frequent door opening |
The core advantages are reflected in the following dimensions:
- Fully transparent vision, no need to open the door to check goods: Managers can directly observe the type, quantity, and placement of goods inside through the transparent glass door body without frequently opening the door, reducing cold air loss by over 30%.
- Permanent anti-fog and anti-frost: The conductive film heating system operates continuously, keeping the glass surface temperature above the external dew point. No matter how large the temperature difference, it will not fog or frost, maintaining all-weather clarity.
- Hollow insulation, significant energy savings: The glass structure uses hollow tempered glass + warm-edge spacer + argon gas filling, with a heat transfer coefficient K value as low as 1.4-2.0W/(m²·K), and insulation performance comparable to traditional insulated door bodies. Compared with frequent door opening for defrosting, energy consumption is reduced by 35%.
- Low voltage and low power consumption: Uses 24V or 36V safe low-voltage power supply, heating power 200-500W/m², with a smart thermostat for intermittent operation, daily power consumption only 1-3 kWh.
- High-strength tempered safety glass: 3C certified tempered treatment, impact resistance 3-5 times that of ordinary glass, breaks into non-toxic, harmless particles, ensuring safe use in cold storage. Tempered glass + explosion-proof film, impact resistance ≥1.2J.
- IP65 waterproof junction box: Eliminates the risk of condensate short circuits and adapts to humid environments.
4. Key Technical Parameters
| Performance Indicator | Typical Parameter | Description |
|---|---|---|
| Startup Speed | 0.1-second startup | Instantaneous response upon power-on |
| Fast Defogging | 20 seconds to clear over 90% fog | Significant fast defogging effect in actual tests |
| Operating Temperature | 35-40°C | Golden temperature range, avoiding overheating hazards |
| Low-Temperature Adaptability | Stable operation at -55°C | Suitable for extreme low-temperature scenarios |
| Light Transmittance | ≥80%, high-end models ≥90% | Almost no effect on the original glass appearance |
| Power Consumption | Approx. 0.05 kWh/m²·h | Low unit-area power consumption |
| Heating Power | 80-150W/m² (adjustable) | IEC 60335 standard |
| Waterproof Rating | IP44 or above | Adapts to humid environments |
| Service Life | >10 years (8 hours daily use) | Verified by accelerated aging tests |
| Heat Transfer Coefficient | ≤1.5W/(m²·K) | Hollow structure (6+12A+6mm) |
| Heating Surface Temperature Difference | <3°C | Good temperature uniformity |
5. Application Scenarios
Electric heating glass cold storage doors are widely used in various cold chain scenarios:
| Industry / Scenario | Temperature Range | Recommended Door Type | Core Requirement |
|---|---|---|---|
| Meat & Aquatic Product Cold Storage | -18°C to -25°C | Electric sliding door, sliding door | Anti-frost, large field of view for inventory observation |
| Fruit & Vegetable Preservation Warehouse | 0°C to 10°C | Swing door, sliding door | Anti-condensation, reduce cold air loss |
| Supermarket Cold Cabinet / Display Cabinet | -5°C to 5°C | Sliding door, double door | Transparent display, self-service access |
| Pharmaceutical Cold Chain Warehouse | 2°C to 8°C | Airtight swing door | Constant temperature stability, visual management |
| Milk Tea / Beverage Shop Cold Cabinet | 0°C to 5°C | Top-sliding door, double door | Display effect, anti-fog aesthetics |
| Laboratory Refrigerator | -20°C to -80°C | Small sliding door | Ultra-low temperature anti-frost, fine observation |
| Ice Cream / Quick-Freeze Cold Storage | -22°C to -35°C | Multi-layer sliding door | Strong anti-frost, high-efficiency insulation |
In the pharmaceutical cold chain sector, GMP-certified sterile cold storage requires real-time observation of vaccine storage status; in the fresh food logistics sector, quick-freeze warehouse observation windows require frost-free operation at -45°C; in the supermarket display sector, open refrigerated cabinets need to improve product display effects; in the laboratory sector, biological sample libraries need to avoid temperature fluctuations caused by frequent door opening.
6. Customer Cases
A pharmaceutical group: Replaced 30 doors of -25°C drug storage, saving RMB 180,000 in electricity annually.
A chain supermarket: Display cabinet complaint rate dropped 90%.
A multinational cold chain company: After adopting Mingda Glass electric heating doors, inspection efficiency increased by 45%, saving over RMB 120,000 in electricity annually by reducing cold air loss.
7. Installation & Maintenance
7.1 Installation Requirements
- Embedded installation: Door frame pre-embedded heating wire interface (220V power supply reserved)
- Silicone sealing strip: Must withstand low temperatures (-60°C elasticity retention >90%)
- Compatible door types: Compatible with sliding doors, translation doors, swing doors, floor spring doors, rolling shutter doors, and other cold storage door types
7.2 Daily Maintenance
- Check circuit impedance monthly (inspection required if deviation >10%)
- Clean with isopropyl alcohol solution (70% concentration)
7.3 Troubleshooting
- Uneven heating: Check zone resistance values
- Complete failure: Check thermostat fuse first
8. Why Choose Mingda Glass?
Since its establishment in 2007, Dongguan Mingda Glass Co., Ltd. has always focused on the R&D and manufacturing of specialty glass such as glass-ceramic, electric heating glass, and conductive glass. The company has 19 years of industry experience, holds 31+ patents, has a 6000㎡ production base, has obtained the "Electric Heating Defogging Glass with Frame for Cold Storage and Glass Door" patent authorization (authorization date 2025-03-25), and participated in drafting the industry standard T/UNP 249—2024 "Electric Heating Coated Glass".
| Company Advantage | Description |
|---|---|
| 19 Years Industry Experience | Focused on glass-ceramic, electric heating glass, conductive glass since 2007 |
| 31+ Patents | Covering electric heating defogging glass, anti-fog glass, graphene heating plates, etc. |
| Industry Standard Participant | Drafting unit of T/UNP 249—2024 "Electric Heating Coated Glass" |
| Proprietary Patented Product | "Electric Heating Defogging Glass with Frame for Cold Storage and Glass Door" patent (authorized 2025) |
| 6000㎡ Production Base | Equipped with magnetron sputtering coating lines, laser etching equipment, and electric heating glass production lines |
| Full-Dimension Customization | Size, voltage, power, door type, and temperature control method all customizable |
| OEM/ODM Support | Supports private label production and joint development, providing complete technical documentation |
9. Frequently Asked Questions (FAQ)
Mingda Glass Co., Ltd
Telephone: +86-189-2253-2007
E-mail: md@mingdaglass.com
Address: No.8, Yiwei Industrial Road 4, Shatian Town, Dongguan City, Guangdong Province
Online message
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