15-0123 v3.X Water Source Heat Pump from Public Water System

Question:

The Anchorage’s primary source of water comes from constant and natural water supplies located at Eklutna Lake and Ship Creek. The water is generated from watersheds located in the Chugach Mountain Range east of Anchorage. The surface water from these two watersheds are treated and distributed to Anchorage’s transmission and main line network. Various natural groundwater wells around Anchorage also contribute to the water supply when needed. The Anchorage Water and Wastewater Utility (AWWU), a municipal department of the City, manages, operates and maintains the City’s water system. (source: AWWU website)The Safe Harbor Village project site is located at the intersection of Muldoon Road and Peck Avenue. The AWWU facilities are approximately 0.6 miles northeast of the Safe Harbor Village. An existing 8-inch water main in Peck Avenue provides public water to the local area with estimated available flows in excess of 1000 gpm. Based on information provided by AWWU, the water temperature in the main is approximately 47 degrees Fahrenheit. Our design strategy for the Net Positive Energy imperative is to harness a small amount of this wasted energy to provide a heat transfer medium for a water source heat pump. This heat pump would provide the thermal energy source for our multi-family affordable housing project. In principal, the proposed concept would harness only a small portion the natural heat energy sourced from Anchorage’s public water supply, although the heat-stream would be mixed at this section of the utility. It is important to note that the water being used by the facility will NOT be wasted. The water will run into the building, and through double walled protection, preventing the unnecessary waste of water. The water will be reinserted into the municipal water supply. While we are still working with the local officials to exhaust every regulatory option, we will be connecting to the municipal water for the fire protection system.We are requesting approval from the Living Future Institute that our intended approach will still meet the Net Positive Energy imperative. The power for our water source heat pump will still be generated on-site. The water will be used as a heat transfer medium, and the power for the heat pump will still be generated on site. The heat from the water system would otherwise be flushed down the drain in a traditional design.We appreciate your review and feedback.

Answer:

It is acceptable to harness waste heat from municipal water pipes for I-06 Net Positive Energy if the municipal infrastructure already exists and the water is not actively heated by combustion sources to get it to temperature. 


Post ID 2775

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