Agricultural Building Ventilation Systems
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306-412-1 AGRICULTURAL BUILDING VENTILATION SYSTEMS MARCH 2016 ACKNOWLEDGEMENTS Funding for this project has been provided by the Governments of Canada and British Columbia through Growing Forward 2, a federal-provincial-territorial initiative DISCLAIMER Opinions expressed in this document are those of the author and not necessarily those of the Governments of Canada and British Columbia. The Governments of Canada and British Columbia, and their directors, agents, employees, or contractors will not be liable for any claims, damages, or losses of any kind whatsoever arising out of the use of, or reliance upon, this information. The report was prepared exclusively for the BC Ministry of Agriculture by Amec Foster Wheeler Americas Limited (Amec Foster Wheeler). The quality of information, conclusions and estimates contained herein is consistent with the level of effort involved in Amec Foster Wheeler's services and based on: i) information available at the time of preparation, ii) data supplied by outside sources and, iii) the assumptions, conditions and qualifications set forth in this report. This report is intended to be used by the BC Ministry of Agriculture only, subject to the terms and conditions of its contract with Amec Foster Wheeler. Any other use of, or reliance on, this report by any third party is at that party’s sole risk. Prepared by: Amec Foster Wheeler Mining & Metals Americas www.amecfw.com C ONTENTS 1.0 INTRODUCTION .............................................................................................................................. 1 1.1 Summary ............................................................................................................................. 1 2.0 BACKGROUND ................................................................................................................................ 2 2.1 The Market........................................................................................................................... 2 2.1.1 Dairy ....................................................................................................................... 2 2.1.2 Poultry..................................................................................................................... 3 2.1.3 Swine ...................................................................................................................... 4 2.2 Animal Demographics in BC................................................................................................ 4 2.2.1 BCStats Development Regions .............................................................................. 5 2.2.2 Distribution of Dairy, Poultry and Swine ................................................................. 7 2.3 Climate in B.C. ..................................................................................................................... 8 2.3.1 Climatic Conditions in B.C. ..................................................................................... 8 2.3.2 Summary of Climate Change in British Columbia .................................................. 9 2.3.3 Impacts of Climate Change on Barn Ventilation .................................................. 10 3.0 AGRICULTURAL BUILDING HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) SYSTEMS ....................................................................................................................................... 11 3.1 Purposes of Agricultural Building HVAC Systems ............................................................ 11 3.2 Ventilation Systems for Livestock and Poultry Housing .................................................... 12 3.2.1 Fans ...................................................................................................................... 12 3.2.2 Natural Ventilation ................................................................................................ 13 3.2.3 Dual Ventilation .................................................................................................... 16 3.2.4 Exhaust Ventilation Systems ................................................................................ 18 3.2.5 Tunnel Ventilation ................................................................................................. 20 3.2.6 Pit Ventilation ........................................................................................................ 23 3.2.7 Combination Pressure / Exhaust Systems ........................................................... 25 3.2.8 Neutral Pressure Systems .................................................................................... 26 3.2.9 Positive Pressure Ventilation Systems ................................................................. 27 3.3 Heating Systems ............................................................................................................... 29 3.3.1 In-Floor Heating .................................................................................................... 29 3.3.2 Gas-Fired Radiant Heating ................................................................................... 31 3.3.3 Convective Heating .............................................................................................. 33 3.3.4 Unit Heaters .......................................................................................................... 34 3.4 Cooling and Circulation Systems ...................................................................................... 36 3.4.1 Air Circulation Fans .............................................................................................. 36 3.4.2 Ducted Recirculation Systems ............................................................................. 39 3.4.3 Cooling with Low-Pressure Water Sprinklers or Drippers .................................... 41 3.4.4 Evaporative Cooling with Direct High–Pressure Misting ...................................... 43 3.4.5 Evaporative Cooling Pads .................................................................................... 45 3.4.6 Evaporative Cooling in Forced Air Systems – Indirect ......................................... 47 3.5 Heat Recovery and Alternatives ........................................................................................ 49 3.5.1 Air-to-Air Heat Recovery....................................................................................... 49 3.5.2 Building Thermal Capacitance ............................................................................. 50 3.5.3 External Thermal Capacitance ............................................................................. 51 3.5.4 Earth Tube System ............................................................................................... 52 3.5.5 Transpired Solar Walls ......................................................................................... 54 3.5.6 Passive Solar Air Heater ...................................................................................... 56 TOC 3.5.7 Greenhouse Barns ............................................................................................... 58 3.5.8 Heat Pumps for Heating and Cooling ................................................................... 58 3.6 Noise, Odour, Dust and Biosecurity .................................................................................. 60 3.6.1 General ................................................................................................................. 60 3.6.2 Noise Control Earth Berms ................................................................................... 62 3.6.3 Noise Barrier Fences ............................................................................................ 63 3.6.4 Vegetative Buffers ................................................................................................ 64 3.6.5 Misting Showers for Dust Abatement ................................................................... 65 3.6.6 Building Electrostatic Charge for Dust Abatement ............................................... 66 3.6.7 Ducted Sound Attenuators ................................................................................... 68 3.6.8 Biosecurity: Air Filtration for Exhaust Air Cleaning ............................................... 69 3.6.9 Biosecurity: Intake Air Biofiltration ........................................................................ 70 3.6.10 Biofiltration for Complete Exhaust System Air Cleaning ...................................... 71 3.6.11 Wet Scrubbers for Exhaust Air Cleaning .............................................................. 73 3.6.12 UV Light for Exhaust Air Cleaning ........................................................................ 75 3.6.13 Non-Thermal Plasma for Exhaust Air Odour Abatement ..................................... 76 3.6.14 Windbreak Walls ................................................................................................... 77 3.6.15 Exhaust Stacks ..................................................................................................... 79 3.6.16 Site Selection and Yard Layout ............................................................................ 80 4.0 THEORETICAL CONSIDERATIONS FOR VENTILATION OF AGRICULTURAL BUILDINGS .... 81 4.1 General .............................................................................................................................. 81 4.2 Energy and Mass Balance................................................................................................