Entrance Requirements for Cold / Refrigeration Storage
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Insulation
Lower thermal transmittance coefficient, higher insulation performance.
Higher insulation performance, less energy consumption.Thermal transmittance coefficient is low at metal shutters and materials with simple structures,
but gets higher at doors especially by metal seams, front/rear side of rail, and top/bottom spaces.That's why guaranteed airtight sealing and insulation are recommended for the door structure.
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Speed
Ambient air shut-off is one of the most important door functions.
This function is maximized by the door's opening/closing speed.
Doors with higher speeds have better shutting-off performance.
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Safety
Doors with frequent access always have hazards of collision, fall, malfunction, etc.
For cold or refrigeration storage, damage to just one or two doors is very fatal as the number of entrances is minimized to maintain temperature.
For this reason, manually-operable double doors are recommended at most cold/refrigeration storage facilities.
Those doors should maintain temperature but also provide a spare door in case the other one of the pair can’t be operated.
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* Every sealing equipment has a gap. -
| Module Dock | General Dock | |
|---|---|---|
| Door applied | Spiral door, Speed door | 75 mm overhead door |
| Form of door | Double door that reaches inside and outside | Single door |
| Outer sealing | Specially-made seal | Dock seal, dock shelter |
| Reinforcement for sealing | Air ventilating equipment within module dock | |
| Durability | Anti-corrosive and semi-permanent material | Requires periodical replacement due to corrosion by condensation |
| Cost due to cool air loss | KRW 300,850/year | KRW 3,417,150/year |
| Total cost due to loss | KRW 7,220,400 (for 24 doors) | KRW 82,011,600 (for 24 doors) |
| Production method | Manufactured at the factory before installation by module | At-site installation |
| Module Dock | General Dock | Note | |
|---|---|---|---|
| Temperature in refrigeration storage | 0℃ | 0℃ | |
| Outer temperature | 15℃ | 15℃ | Yearly mean temperature in Korea applied |
| Door size | W 2,400 × H 2,400 | W 2,400 × H 2,400 | Cold container |
| Work days per week | 6 days | 6 days | |
| Work hours per day | 8 hours | 8 hours | |
| Number of door uses per day | 30 | 30 | |
| Thermal transmittance coefficient (W/㎡. K) | 0.5 | 1.3 | |
| Sealing effect (%) | 99 | 75 | |
| Yearly power consumption (kWh) | 2,384 | 24,768 |
| Outer risk | Impact |
|---|---|
| Cold air during winter | Increase in energy consumption by heater operation |
| Hot air during summer | Increase in energy consumption by cooling device operation |
| Humid/dry air | Condensation |
| Fine/yellow dust | Damages on product |
| Insect | Damages on product |
Not only human and products access doors.
