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ASLC HEATING SYSTEM PERFORMANCE - ACEP Monitoring Period Performance April 1, 2016 - April 30, 2017 - compiled by Darryl Schaefermeyer, Special Projects Director, Alaska SeaLife Center Pie Chart Of Electricity Usage RTWD HP System CO2 HP System Electric boiler DHW Immers Htr DHW HP-3 System* 463,414.00 159,286.00 KWH 23,516.00 13,188.00 Pie Chart Of Heating & Cooling Production CO2 HPs Heat Energy CO2 HPs Cooling Energy Electric Boiler Heat Energy DHW Immersion Heater Energy DHW HP-3 Heat Energy* MMBTU 474,934.00 RTWD HP Heat Energy 4,474.00 2,802.47 407.53 543.64 80.26 185.00 Electricity Usage For Heating & Cooling ASLC Heat Pump System - April 1, 2016 - April 30, 2017 DHW HP-3 System* 1% RTWD HP System 42% DHW Immers Htr 2% Electric boiler 14% DHW Immersion Heater Energy 1% Electric Boiler Heat Energy 6% CO2 HPs CoolingEnergy 5% DHW HP-3 Heat Energy* 2% Heating & Cooling Energy Production ASLC Heat Pump System April 1, 2016 - April 30, 2017 RTWD HP Heat Energy 53% CO2 HP System 41% CO2 HPs Heat Energy 33% Electricty Usage (KWH) - ASLC Heating System April 1, 2016 - April 30, 2017 RTWD HP System 474,934.00 CO2 HP System 463,414.00 Electric boiler 159,286.00 1 DHW Immers Htr 23,516.00 DHW HP-3 System* 13,188.00 Figure 3 ASLC Heat Pump System Performance Problems Encountered during the monitoring period • On January 30, 2017, one of the four CO2 refrigerant heat pumps (HP-7) shutdown due to a faulty pressure transducer. A replacement transducer was supplied by Mayekawa along with tools to assist in the repair. ASLC personnel with the assistance of the AVTEC refrigeration class were able to replace the transducer and restore operation of the heat pump on April 13, 2017. With the heat pump off-line, greater operation of the electric boiler was necessary which was reflected in lower CO2 heat pump system energy performance and a lower system COP. • During February and March 2017, fouling of the Seametrics flow meter paddle- wheels caused the flow meters for the CO2 refrigerant heat pumps to record incorrectly or not record at all. This has resulted in periods of lower than actual 6PDF Image | Trans-Critical CO2 Heat Pump System AEA Grant
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