In the 1800’s, Denver set up a state-of-the-art heating system for downtown buildings, using a central steam boiler to supply heat. But this ageing system needs repairs, and the city is trying to reduce carbon emissions from the now natural gas fired boilers. So, Denver is spending $300 million to connect eleven city buildings to a new hydronic system.
Tepid water is circulated between the buildings, where water source heat pumps draw heat from the circulating water to provide heating. The circulating water then draws that heat from either geothermal wells drilled 1,000 feet into the Earth or from…sewerage. The less than desirable byproduct of humans has a lot of energy available to provide heat for HVAC needs. So, to turn up the thermostat in your city office, you might just need to make a quick restroom trip and flush. – Steve Terry, DTC HVAC & Refrigeration Instructor
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