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Desuperheaters on Residential Air-Source Heat Pumps

Desuperheaters on Residential Air-Source Heat Pumps. August 5, 2008 Regional Technical Forum. Installation/Overview. Source: Turbotec Products, Inc. “ENVIRO-PAK Installation, Operation, and Maintenance Manual” http://www.turbotecproducts.com/Literature_files/Enviro-Pak%20IOM.pdf.

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Desuperheaters on Residential Air-Source Heat Pumps

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  1. Desuperheaters on Residential Air-Source Heat Pumps August 5, 2008 Regional Technical Forum

  2. Installation/Overview Source: Turbotec Products, Inc. “ENVIRO-PAK Installation, Operation, and Maintenance Manual” http://www.turbotecproducts.com/Literature_files/Enviro-Pak%20IOM.pdf

  3. Manufacturers • Trevor-Martin Corporation manufactures multiple models under various brand names http://www.trevormartin.com/index.asp • Turbotec Products, Inc. manufactures the “Enviro-Pak” http://www.turbotecproducts.com/EPhome.html • Others – Primarily Commercial/Industrial Equipment • Therma-Stor LLC • Doucette Industries, Inc.

  4. Cost • Cost Components • Equipment Purchase • Desuperheater • Installation • Mount desuperheater • Recover Refrigerant • Install Refrigerant Lines between desuperheater and compressor discharge line • Install new storage tank (or drain existing tank if not using a storage tank) • Install Water Lines between desuperheater and storage tank • Charge heat pump with refrigerant • Insulate refrigerant and water lines • Commission the system • Turbotec (source: Turbotec Representative) • Trade Price: $583 • Installation: about $1000 • does not include storage tank option • Total Installed Cost: about $1500 • Trevor Martin (source: Trevor Martin Representative) • Online Retail: $425 • Total Installed Cost: $900 • ORNL 1983 Report • Total Installed Cost: $600 in 1983 (or $1100 in 2008) • Does not include storage tank option • Obtained through dealer quotes

  5. Energy Savings • ORNL 1983 Report: • Method: Monthly Bin Analysis • Assumptions: • 20% of heating and cooling capacity available to heat water. • 75 gallons/day hot water use evenly distributed throughout the day • Energy Savings:

  6. Cost Effectiveness • Assumptions: • 5th Plan Assumptions • Measure Life: 10 years • Measure Load Shapes • Winter Savings: ResSpHtHP • Summer Savings: ResCAC

  7. Potential Issues • Poor track record when installers are asked to add more complex equpiment to a heat pump. • A second water tank should be installed to realize best savings. • In retrofit cases, installation costs will vary widely, depending on location of HP with respect to the water heater. The desuperheater should be located near the water heater (non-freezing area). • Summer savings will vary, depending on how much air-conditioning the house uses. How would a program pick out the high users effectively? • High efficiency equipment has less superheat. • In heating mode, how much is the supply air temperature affected (cooled)? Comfort issues? • Others?

  8. Next Steps • Consensus on pursuing this measure further? • Perform more detailed modeling? • Support a small real-world monitoring project? • Obtain better cost data?

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