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7<br />
Secondary functions<br />
HP heat recovery<br />
system<br />
Patents<br />
Secondary functions<br />
of the HP heat recovery<br />
system<br />
Apart from the primary heat<br />
recovery function, a number<br />
of secondary functions can<br />
be implemented with this<br />
technology. The interposition<br />
of a heat transfer medium<br />
makes it possible to supply<br />
additional heating or cooling<br />
of the heat transfer medium<br />
without any additional heat<br />
exchangers on the air side,<br />
using water/water heat exchangers<br />
only.<br />
A direct supply of additional<br />
media (e.g., cold water) via a<br />
three-way valve is likewise<br />
feasible.<br />
For these functions (heating,<br />
cooling), a HP system with a<br />
heat recovery rate of at least<br />
70% is required (VDI 2071).<br />
Supply air<br />
indirect heating<br />
PHW<br />
PCW<br />
indirect cooling<br />
Extract air<br />
Outlet<br />
PCW<br />
direct cooling<br />
M<br />
M<br />
Heat recovery-C<br />
Venting devices<br />
Drain points<br />
Heat recovery-H<br />
Example of a HP countercurrent heat recovery system<br />
M<br />
Entry<br />
Downflow countercurrent tubing with automatic draining<br />
and venting. Outlet / Venting devices / Drain points<br />
Heat exchanger Patent Specification<br />
P 195 14 167 German Patent 1997<br />
P 198 08 753 German Patent 1999<br />
Downflow countercurrent tubing with automatic<br />
draining and venting<br />
Outlet / Venting devices / Drain points
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