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HVAC Design

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Strategy Guideline: HVAC Equipment SizingArlan BurdickIBACOS, Inc.

February 2012

This report received minimal editorial review at NREL

NOTICE This report was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Available electronically at http://www.osti.gov/bridge Available for a processing fee to U.S. Department of Energy and its contractors, in paper, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831-0062 phone: 865.576.8401 fax: 865.576.5728 email: mailto:reports@adonis.osti.gov Available for sale to the public, in paper, from: U.S. Department of Commerce National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 phone: 800.553.6847 fax: 703.605.6900 email: orders@ntis.fedworld.gov online ordering: http://www.ntis.gov/ordering.htm

Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste

Strategy Guideline: HVAC Equipment Sizing

Prepared for: Building America Building Technologies Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy

Prepared by: Arlan Burdick IBACOS, Inc. 2214 Liberty Avenue Pittsburgh, Pennsylvania 15222

NREL Technical Monitor: Michael Gestwick Prepared under Subcontract No. KNDJ-0-40341-02 February 2012

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ContentsList of Figures ............................................................................................................................................ iv List of Tables ............................................................................................................................................... v Definitions ................................................................................................................................................... vi Executive Summary .................................................................................................................................. vii 1 Introduction ........................................................................................................................................... 1 2 Overview ................................................................................................................................................ 3

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2.1 Design Conditions ................................................................................................................6 2.2 Preliminary Equipment Selection ........................................................................................7 2.3 Manufacturer Data Tables....................................................................................................8 2.4 Cooling Equipment Capacity Sensitivities ..........................................................................9 2.5 Estimated Target Cubic Feet per Minute ...........................................................................12 2.6 Efficiency Considerations ..................................................................................................13Chicago House Example .................................................................................................................... 15

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3.1 Cooling Equipment Selection ............................................................................................15 3.2 Furnace Selection ...............................................................................................................20Orlando House Example .................................................................................................................... 24

5 Conclusion .......................................................................................................................................... 35 References ................................................................................................................................................. 36

4.1 Air Source Heat Pump Selection .......................................................................................26 4.2 Heat Pump Cooling Capacity Selection.............................................................................27 4.3 Heat Pump Heating Capacity Selection .............................................................................30

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List of FiguresFigure 1. Design information from ACCA Manual JResidential Load Calculation. .......................... 1 Figure 2. Upflow furnace scenario as in the Chicago House. ................................................................ 4 Figure 3. Heat pump scenario as in the Orlando House. ........................................................................ 5 Figure 4. General steps to equipment selection. ..................................................................................... 6 Figure 5. Design information needed. ....................................................................................................... 7 Figure 6. Fictitious example: detailed cooling capacities table. ............................................................ 8 Figure 7. Airflow sensitivity graph (from Manual S, Figure 3-1)........................................................... 10 Figure 8. OAT sensitivity graph (from Manual S, Figure 3-1). .............................................................. 10 Figure 9. Indoor EWB sensitivity graph (from Manual S, Figure 3-1). ................................................. 11 Figure 10. Indoor EDB temperature sensitivity graph (from Manual S, Figure 3-1). .......................... 11 Figure 11. TD value table (from Manual S, Table 1-4)............................................................................ 12 Figure 12. Chicago House BEopt 1.1 output. ......................................................................................... 13 Figure 13. Orlando House BEopt 1.1 output. ......................................................................................... 14 Figure 14. Cooling equipment selection step 1. .................................................................................... 15 Figure 15. Chicago House design information. ..................................................................................... 15 Figure 16. Cooling equipment selection step 2. .................................................................................... 16 Figure 17. Cooling equipment selection step 3. .................................................................................... 16 Figure 18. Wet-bulb temperature on sea-level psychometric chart. .................................................... 17 Figure 19. Cooling equipment selection step 4. .................................................................................... 17 Figure 20. Fictitious example: detailed cooling capacities table, 800 cfm. ........................................ 18 Figure 21. Fictitious example: detailed cooling capacities table, 715 cfm and 750 cfm. .................. 19 Figure 22. Interpolation table for capacities at 89F outdoor design temperature. ........................... 19 Figure 23. Furnace selection steps. ........................................................................................................ 20 Figure 24. Furnace specification chart. .................................................................................................. 21 Figure 25. Air delivery performance table. ............................................................................................. 22 Figure 26. Fictitious furnace performance example. ............................................................................. 22 Figure 27. Air delivery performance table for the Chicago House. ..................................................... 23 Figure 28. Air source heat pump selection steps. ................................................................................. 24 Figure 29. Development of balance-point diagram. .............................................................................. 25 Figure 30. Air source heat pump selection step 1. ................................................................................ 26 Figure 31. Orlando House design information. ...................................................................................... 26 Figure 32. Air source heat pump selection step 2. ................................................................................ 27 Figure 33. Air source heat pump selection step 3. ................................................................................ 28 Figure 34. Wet-bulb temperature on sea-level psychometric chart. .................................................... 28 Figure 35. Cooling equipment selection step 4. .................................................................................... 29 Figure 36. Fictitious example: detailed heat pump cooling capacities table, 700 cfm. ..................... 30 Figure 37. Interpolation table for cooling capacities at 92F outdoor design temperature. ............. 3