THE DELTA BETWEEN INTERNAL AND EXTERNAL TEMPERATURE
To better understand the importance of the delta temperature, here are some examples:
- Chilled with internal temperature of +5°C and external temperature of +35°C = delta of 40°C.
- Frozen with internal temperature of –15°C and external temperature of 10°C = delta of 25°C.
- Frozen with internal temperature of –25°C and external temperature of 35°C = delta of 60°C.
From these figures we understand the importance of always taking into consideration the maximum external temperatures in summer and in winter (not the averages), putting them in relation to the internal temperatures that are instead constant (in every case a solution that has the best possible insulation is always a source of energy saving).
The implementation of Campisa “energy saving” loading bays includes a “recessed loading bay”, which comprises a 2500mm long loading ramp with a 1000mm telescopic lip, built into a pit 3000mm in length. This means that in the rest position, the ramp remains retracted by 500mm compared to the edge of the dock.
The prefabricated pits ensure the perfect execution of the retracted pits. The sectional door closes in front of the loading bay with the loading ramp inside.
If the pit for the loading ramp has the housing for the vehicle’s tail gate lift underneath, an insulated sandwich panel will be fitted between the pit ramp and the tail gate pit.
The sectional door will have a thickness of 40mm for chilled goods and 80mm for frozen goods. Obviously it will also be appropriate to use the 80mm thickness for chilled goods with a significant delta. It is important always to bear in mind that one cause for the increase in delta comes from the dark colour of the door, and for this reason RAL 9002 white is always recommended.
Campisa recommends the FIDELITY hydraulic lifting system for the perfect perimeter seal and lower seal in particular (proven by numerous thermographic tests), compared to standard balance sectional doors that with springs loaded slightly more than necessary, keep the closed door raised by as much as 5–10cm.