Juneau District Heating – The District Heating Loop
The District Heating Loop will consist of the “hot” (above 180°F) fresh water piping that leaves the District Heating Plant to be circulated and transferred to customer locations via an on-site energy transfer station (ETS). After the customer receives their heat from the water, the now slightly cooler freshwater will return via piping along a parallel path back to the District Energy Plant, where it will be reheated and recirculated again and again. The main hot delivery and colder return piping is to be constructed in parallel paths throughout the district. The ETS systems will be connected to the customer building hydronic heating systems.
With the use of the Emerson Seawater Heat Pump technology there is no need for an expensive building hydronic system piping “rip and replace” retrofit. The connection to the district heating supply simply adds an energy transfer station on the building premises that connects to the building hydronic system. The facility provides hot water heat on one side and discharges colder water on the other side that is returned to the district energy plant for reheating. A Btu meter monitors the amount of Btu’s that is used by the customer.
The City and Borough of Juneau (CBJ) stongly supports the creation of a Juneau District Heating. The broad public support from Juneau citizens and many potential customers to reduce the energy costs and make Juneau a more sustainable city is overwhelming.