Silver Gulch Brewery Biomass Heating System Condition Survey in Fairbanks, Alaska FINAL REPORT – 10/22/2018 800 F Street, Anchorage, AK 99501 p (907) 276-6664 f (907) 276-5042 Lee Bolling, PE Biomass Heating System Condition Survey Silver Gulch Brewery Contents 1. Executive Summary ........................................................................................................... 1 2. Introduction ...................................................................................................................... 2 3. Preliminary Site Investigation ............................................................................................ 3 BUILDING DESCRIPTION ................................................................................................................................................... 3 EXISTING HEATING PLANTS .............................................................................................................................................. 4 PROCESS EQUIPMENT ..................................................................................................................................................... 6 PLANNED STEAM SYSTEM IMPROVEMENTS .......................................................................................................................... 8 4. Biomass System ................................................................................................................. 9 CHIP HANDLING SYSTEM ............................................................................................................................................... 10 WOOD CHIP COMBUSTOR UNIT ...................................................................................................................................... 13 STEAM BOILER UNIT ..................................................................................................................................................... 17 HEAT EXCHANGER FOR SPACE HEAT ................................................................................................................................. 19 5. Steam Control Discussion ................................................................................................. 20 6. Pre-Feasibility Discussion Points for Future Follow-up ...................................................... 21 CHIP FEED SYSTEM ....................................................................................................................................................... 21 AZSD-250 COMBUSTOR UNIT ....................................................................................................................................... 21 AJAX STEAM BOILER UNIT ............................................................................................................................................ 21 HEAT EXCHANGER ........................................................................................................................................................ 22 7. Energy Consumption and Costs ........................................................................................ 23 ENERGY COSTS ............................................................................................................................................................ 23 WOOD CHIPS .............................................................................................................................................................. 23 HEATING OIL ............................................................................................................................................................... 23 ELECTRICITY ................................................................................................................................................................ 23 EXISTING FUEL OIL CONSUMPTION .................................................................................................................................. 24 BIOMASS SYSTEM CONSUMPTION ................................................................................................................................... 24 8. Forest Resource and Fuel Availability Assessments .......................................................... 25 FUEL AVAILABILITY ....................................................................................................................................................... 25 AIR QUALITY PERMITTING .............................................................................................................................................. 25 9. General Biomass Technology Information ........................................................................ 26 HEATING WITH WOOD FUEL ........................................................................................................................................... 26 TYPES OF WOOD FUEL .................................................................................................................................................. 26 HIGH EFFICIENCY WOOD PELLET BOILERS ......................................................................................................................... 27 HIGH EFFICIENCY CORDWOOD BOILERS ............................................................................................................................ 27 LOW EFFICIENCY CORDWOOD BOILERS ............................................................................................................................. 27 HIGH EFFICIENCY WOOD STOVES .................................................................................................................................... 28 BULK FUEL BOILERS ...................................................................................................................................................... 28 HEAT PUMPS............................................................................................................................................................... 28 GRANTS ..................................................................................................................................................................... 28 Coffman Engineers, Inc. i Biomass Heating System Condition Survey Silver Gulch Brewery Appendices Appendix A – Site Photos Appendix B – AWEDTG Field Data Sheets Appendix C – New Horizons Corp Correspondence (AZSD-250 Distributor) Appendix D – Control Panel Electrical Schematic (AZSD-250 Unit) Appendix E – State Boiler Permit Form Appendix F – AJAX Boiler Cutsheet and Email Correspondence Coffman Engineers, Inc. ii Biomass Heating System Condition Survey Silver Gulch Brewery Abbreviations ACF Accumulated Cash Flow ASHRAE American Society of Heating, Refrigerating, and Air-Conditioning Engineers AEA Alaska Energy Authority AFUE Annual Fuel Utilization Efficiency B/C Benefit / Cost Ratio BTU British Thermal Unit BTU/hr BTU per hour COP Coefficient of Performance CFM Cubic Feet per Minute Eff Efficiency F Fahrenheit ft Feet GPM Gallons Per Minute HP Horsepower HVAC Heating, Ventilating, and Air-Conditioning in Inch(es) kW Kilowatt(s) kWh Kilowatt-Hour lb(s) Pound(s) MBH Thousand BTUs per Hour O&M Operations and Maintenance MAWP Maximum Allowable Working Pressure MDSC Maximum Designed Steaming Capacity MMBTU One Million BTUs PC Project Cost R R-Value SF Square Feet, Supply Fan TEMP Temperature TPY Tons per Year V Volts VRF Variable Refrigerant Flow W Watts Coffman Engineers, Inc. iii Biomass Heating System Condition Survey Silver Gulch Brewery List of Figures Figure 1 – Silver Gulch Brewery .................................................................................................................... 2 Figure 2 – Aerial image of Silver Gulch Brewery ........................................................................................... 3 Figure 3 – Oil-fired steam boiler for process heating and DHW ................................................................... 5 Figure 4 – Three oil-fired water boilers for space heating located on the mezzanine ................................. 5 Figure 5 – Brewing process equipment heated by steam ............................................................................ 6 Figure 6 – Brewing process equipment heated by steam ............................................................................ 7 Figure 7 – Refrigerated tanks in the mechanical addition ............................................................................ 7 Figure 8 – Aerco steam hot water generator................................................................................................ 8 Figure 9 – Mechanical Building Addition .................................................................................................... 10 Figure 10 – Vacuum hose for chips ............................................................................................................. 11 Figure 11 – Chip vacuum system on mezzanine level ................................................................................. 11 Figure 12 – Air lock isolates day hopper from vacuum system (located on mezzanine level) ................... 12 Figure 13 – Vacuum system on mezzanine and day hopper below (looking up from ground floor) ......... 12 Figure 14 – AZSD-250 Wood Chip Combuster Components (O&M Manual Diagram) ............................... 13 Figure 15 – AZSD-250 Wood Chip Combuster and AJAX Boiler .................................................................