Comment by uberex
5 hours ago
45 is the cool temp so they could send the community a higher temp water to their heat exchanger?
Then 45 or below is sent back on the return.
5 hours ago
45 is the cool temp so they could send the community a higher temp water to their heat exchanger?
Then 45 or below is sent back on the return.
Yes, but the heat will still likely need boosting by about a further 10 degrees either at the source or end user.
DC inlet is 45°C, outlet is 55°C assuming a 10°C ΔT. By the time that's travelled 500m–1km through pipework you've lost a few degrees, so you're arriving at the HIU at maybe 50–52°C. The home radiator circuit then takes that down by around say 12°C, returning ~38°C. Factor in pipe losses on the return leg and you're back at the data centre with maybe 35°C inlet rather than 45°C — meaning the DC output is now only 45°C rather than 55°C, and the whole system gradually degrades each cycle. You could address this by mixing some hot output back into the return to keep the DC inlet stable at 45°C, but eh.
>Factor in pipe losses on the return leg and you're back at the data centre with maybe 35°C inlet rather than 45°C
Surely having the input fluid being colder is a benefit, not a problem? Just run the fluid more slowly through the system?
In essence you can't really because slower flow rate makes the heat transfer less efficient. You'd be halfing the flow rate in that example.