I am worried about your proposal to install a groundwater heating system in my daughter’s school. I don’t think that water at a temperature of 30°C has enough energy to heat the school. If the school is too cold, the students won’t be able to focus on learning.
Respond to David Li’s letter. Explain how the groundwater system could heat the air in the school.

if the temp of the ground water from a seismic vent is actually 30 celcius then it would totally have enough energy to heat to room temperature which is close to half that temperature

you could simply pump the water through a forced air system and the air would absorb heat energy from the water that is circulated through and the air would leave warmer than when it came in.  it doesn't need to be increased by 30 degrees celcius, that is likely the sticking point for him

Explanation:

The temperature would increase assuming it is 30 degree water causing a change in the temperature and assuming it is a seismic groundwater source you are using the earths core to heat the school so it would likely be a stable energy source. There are very few places on the planet where that warm of water is accessible without drilling really deep into the core but if it is there and is a stable fault then the energy would be consistent and stable.

what does the table look like

the answer is b. dilution