DeProfundis’ Open loop advances :
DeProfundis found a way to push further the cavitation limit, allowing the use of smaller pipes and therefore a reduction of costs. This reduction applies to the purchase of equipment, its transportation, and the implementation which requires smaller machinery easily available on site, as opposed to regular SWAC systems which require heavy machinery.
Pipes are available by 100m rolls : the deployment is significantly easier than a regular SWAC, and we aim at making it half as expensive as the regular SWAC’s initial investment.
DeProfundis’ Closed loop advances :
The aim of such a system (as sketched above) is to make this technology available for medium-sized consumers (from 1000 to 10000 m² like some hospitals or hostels). Instead of being rejected in the sea, the water returns to the cold source and is cooled back to a temperature close to the initial one (depending on the heat exchanger used). In addition to the advantages of the open loop system (reduction of costs thanks to the use of smaller pipes), we have the following :
- Use of still water instead of sea water, for it presents with a greater heat capacity (≈ 4200 J.L−1.K−1 for still water, ≈ 4114 J.L−1.K−1 for sea water).
- No need for an inlet filter (which would require frequent maintenance).
- No risk of aspirating sea water material or animals that could damage the system or the local ecosystem.
However, it also comes with a few set of limits :
- The closed loop structure requires 50% more pipes than the regular SWAC
- Efficiency of the heat exchanger will increase the heat of the cold water by 1°C