Amvic Building System. Presented to: Rick Stacey

Transcription

1 Amvic Building System École Secondaire de Windsor Building Construction Comparative Energy Study Presented to: Rick Stacey Amvic Building System File: Dickson Ave Kelowna, BC V1Y 9Y2 Contact: Emmanuel Lavoie, EIT LEED September, 27

2 AmvicP P Building System Table of Contents 1. INTRODUCTION STUDY DESCRIPTION & ASSUMPTIONS #1 PROPOSED SCHOOL ENVELOPE CONSTRUCTION #2 - ICF AMVIC WALL CONSTRUCTION WITH PROPOSED SCHOOL ROOF CONSTRUCTION #3 - ICF AMVIC WALL CONSTRUCTION WITH AMDECK ROOF VARIOUS ASSUMPTIONS AND INFORMATION ENERGY COMPARISON CONCLUSION APPENDIX A.4.9 APPENDIX B scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc i

3 Introduction September 3, Introduction Stantec Consulting Ltd. (Kelowna office) was commissioned by Amvic to provide a comparative study of the anticipated energy savings using insulated concrete form construction (ICF) at the École Secondaire de Windsor in Windsor, Ontario. Opinions stated in this report are based upon conversations and information provided by Luis Trelles Turgeon, New Construction Project Coordinator for the Conseil Scolaire de District du Centre-Sud-Ouest. Lead Stantec Consulting personnel participating in this study included: Emmanuel Lavoie, EIT, LEED AP The contact for this report is Mr. Emmanuel Lavoie ( ). 2. Study Description & Assumptions The École Secondaire de Windsor project is currently at the design phase. It is Stantec s understanding that this project is targeting the LEED Gold level of certification. Due to high insulation values, increased thermal mass and greater resistance to infiltration, the ICF Amvic wall and roof systems offer an energy efficient type of wall and roof construction. The purpose of this report is to quantify the level of energy savings available by using ICF Amvic wall and roof systems over the currently proposed block wall, spray applied insulation and exterior brick construction. Current architectural plans of this facility were used to produce a detailed heat loss/heat gain model. The Trace7 energy and load modeling software was used to obtain peak heating and cooling loads as well as monthly total cooling and heating energy for three different building construction alternatives. Typical school schedules were used in the modeling software to account for alternate summer occupancies and temperature setpoints. The outputs from the Trace7 software were utilized to produce further engineering calculations using up-to-date local energy rates. Utilizing this data, it was possible to calculate annual energy costs for the three construction alternatives. scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 2.1

4 September 3, 27 The energy costs presented in this report only account for the building envelope heat gains and heat losses. Other energy uses such as outside air heating/cooling, lighting, computers, domestic hot water and other miscellaneous loads were ignored in this study. These figures were not included in this study as they are identical in all three alternatives and are not influenced by the envelope construction. Based on Stantec s experience in energy audit/modeling, building envelope heating gains/losses typically account for 15%-3% of a school s total yearly energy consumption. The three alternatives studied in this report are presented below: 2.1 #1 PROPOSED SCHOOL ENVELOPE CONSTRUCTION This alternative is based on the current proposed wall and roof assemblies. This information was obtained from the architectural drawings. The wall and roof assemblies were modeled in NRCan s EE4 modeling software to obtain the total R-values. The EE4 outputs can be found in Appendix A. 1. Proposed exterior wall assembly (R-15.9): a. 8 concrete block b. Air-vapour barrier c. 2.5 spray applied insulation d. 1 air space e. 3.5 face brick Note: It is important to note that the proposed exterior wall assembly already achieves a good level of energy efficiency due to a high insulation value, lack of thermal bridging, resistance to infiltration and high thermal mass. 2. Proposed roof assembly (R-24): a. 2.5 wood deck b. Vapour barrier c. 4 rigid insulation d. 1 fibreboard e. Tapered insulation scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 2.2

5 September 3, Windows: f. Thermoplastic roof membrane a. U-value:.3 b. Shading Coefficient:.5 4. Infiltration assumed to be.6 cfm/sq.ft. of exterior wall 2.2 #2 - ICF AMVIC WALL CONSTRUCTION WITH PROPOSED SCHOOL ROOF CONSTRUCTION This alternative assumes insulated concrete form construction to the underside of the roof assembly. The roof would consist of the current proposed roof assembly. 1. High thermal mass ICF Amvic wall (R-23) 2. Proposed roof assembly (R-24): 3. Windows: a. 2.5 wood deck b. Vapour barrier c. 4 rigid insulation d. 1 fibreboard e. Tapered insulation f. Thermoplastic roof membrane a. U-value:.3 b. Shading Coefficient:.5 4. Infiltration assumed to be.6 cfm/sq.ft. of exterior wall 2.3 #3 - ICF AMVIC WALL CONSTRUCTION WITH AMDECK ROOF This alternative assumes insulated concrete form Amvic wall construction with Amdeck roof construction. 1. High thermal mass ICF Amvic wall (R-23) scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 2.3

6 September 3, High thermal mass Amdeck roof system (R-32) 3. Windows: a. U-value:.3 b. Shading Coefficient:.5 4. Infiltration assumed to be.6 cfm/sq.ft. of exterior wall 2.4 VARIOUS ASSUMPTIONS AND INFORMATION 1. Energy Costs as of August 22, 27: a. Electricity: Hydro One Rate Code Small Business Customer : $.62/kWh runout rate b. Natural Gas: Enderbridge Rate Code 6: $11.15/GJ 2. Proposed mechanical system for school is distributed heat pumps connected to a boiler/tower loop. a. Performance of Cooling Equipment: 1 EER b. Performance of Heating Furnace: 85% efficiency 3. Building information (approximate figures): a. Floor area: 88,4 ft 2 b. Roof area: 53,9 ft 2 c. Wall area: 37,9 ft 2 d. Glass area: 7,2 ft 2 3. Energy Comparison The heating/cooling loads and energy consumption information presented in this section represent the energy losses and gains experienced through the building envelope. The three alternatives presented in Section 2. offer the following peak heating and cooling loads and annual energy consumptions: scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 3.4

7 September 3, 27 Type of Building Construction Peak Heat load (Btu/h) Peak Cooling load (tons) Heating Annual GJ Cooling Annual ton*hours Annual Heating Cost ($) Annual Cooling Cost ($) Total Annual Energy Costs ($) Proposed School Construction 643, ,917 $1, $4,383.4 $15, ICF Amvic Walls with Proposed Roof System 61, ,393 $9, $4, $13,313.9 ICF Amvic Walls with AmDeck roof system 571, ,818 $8,37.76 $4,376.9 $12, The following chart illustrates the total annual heating costs for the three construction alternatives: Annual Natural Gas Costs for Building Envelope Heating of École Secondaire de Windsor Annual Natural Gas Cost $12,. $1,. $8,. $6,. $4,. $2,. $- $1, Proposed School Construction $9, ICF Amvic Walls with Proposed Roof System $8,37.76 ICF Amvic Walls with AmDeck roof system Type of Construction scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 3.5

8 September 3, 27 The following chart illustrates the total annual cooling costs for the three construction alternatives: Annual Electricity Costs for Building Envelope Cooling of École Secondaire de Windsor $6, Annual Electricity Cost $5, $4, $3, $2, $1, $4,383 $4,196 $4,376 $- Proposed School Construction ICF Amvic Walls with Proposed Roof System ICF Amvic Walls with AmDeck roof system Type of Construction scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 3.6

9 September 3, 27 The following chart illustrates the total annual energy costs for the three construction alternatives: Annual Total Costs of Energy to Heat and Cool the Building Envelope of École Secondaire de Windsor $2,. Annual Energy Cost $18,. $16,. $14,. $12,. $1,. $8,. $6,. $4,. $15, $13,313.9 $12, $2,. $- Proposed School Construction ICF Amvic Walls with Proposed Roof System ICF Amvic Walls with AmDeck roof system Type of Construction 4. Conclusion The École Secondaire de Windsor, a high school currently in the process of being designed, was modeled in load and energy software to obtain detailed peak heating and cooling loads as well as monthly tabulated energy consumption. These figures were used to perform a comparative analysis of the yearly energy costs for cooling and heating three building envelope alternatives. Compared to the proposed building envelope, the insulated concrete form (ICF) Amvic construction system offers better insulating value and a greater thermal mass for the roof system. It is important to note that the proposed exterior wall assembly already achieves a good level of energy efficiency due to a high insulation value, lack of thermal bridging, resistance to infiltration and high thermal mass. scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.7

10 September 3, 27 In the case of the École Secondaire de Windsor, ICF Amvic walls with proposed roof construction would provide approximately $1,8 in annual energy savings over the proposed wall and roof construction. ICF Amvic walls and Amdeck roof would provide approximately $2,7 in annual energy savings over the proposed wall and roof construction. scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.8

11 September 3, 27 Appendix A EE4 wall and roof construction R-value calculation Walls: scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.9

12 September 3, 27 ** Average of both wall R-values was used since exact type of spray insulation is unknown. Average of R-13.4 and R-18.4 = R-15.9 scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.1

13 September 3, 27 Roof: scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.11

14 September 3, 27 Trace 7 Outputs scl w:\1121\active\ _amvic_icf_school_energy_study\report\ _amvic_icf_school_energy_study_final.doc 4.12

15 System Checksums By Stantec Consulting Ltd. Distributed Heat Pump Fan Coil COOLING COIL PEAK CLG SPACE PEAK HEATING COIL PEAK TEMPERATURES Peaked at Time: Mo/Hr: 7 / 15 Mo/Hr: Sum of Mo/Hr: Heating Design Outside Air: OADB/WB/HR: 87 / 74 / 18 OADB: Peaks OADB: -1 SADB Plenum Space Plenum Net Percent Space Percent Space Peak Coil Peak Percent Return Sens. + Lat. Sens. + Lat Total Of Total Sensible Of Total Space Sens Tot Sens Of Total Ret/OA Btu/h Btu/h Btu/h (%) Btu/h (%) Btu/h Btu/h (%) Fn MtrTD.. Envelope Loads Envelope Loads Fn BldTD.. Skylite Solar Skylite Solar. Skylite Cond Skylite Cond. Fn Frict.. Roof Cond 36,152 36, ,169 3 Roof Cond -159, , Glass Solar 328,86 328, , Glass Solar. Glass Cond 36,149 36, ,653 3 Glass Cond -175,97-175, Wall Cond 69,176 69, ,549 9 Wall Cond -127, , AIRFLOWS Vent 5 5 Infiltration 139, , Infiltration -176, , Infil 2,275 Sub Total ==> 69,796 69, ,51 74 Sub Total ==> -639,41-639, Supply 37,238 37,238 Partition Exposed Floor Partition Exposed Floor.. Internal Loads Internal Loads MinStop/Rh Return 37,238 39,513 Lights 176, , , , Lights. Exhaust 5 2,325 People People. Rm Exh Misc Misc. Auxiliary Sub Total ==> 176, , , , Sub Total ==>. Ceiling Load Ceiling Load. Ventilation Load 2,771 Ventilation Load -3,873.6 Dehumid. Ov Sizing Ov/Undr Sizing. Ov/Undr Sizing Exhaust Heat. Exhaust Heat -1,382-1,382-1 OA Preheat Diff.. Sup. Fan Heat 2 RA Preheat Diff.. Ret. Fan Heat 2 2 Additional Reheat. Duct Heat Pkup Reheat at Design ENGINEERING CKS % OA.1.1 cfm/ft² cfm/ton ft²/ton 1,11.42 Btu/hr ft² No. People Grand Total ==> 786, ,82 955, , Grand Total ==> -639,41-643, Main Clg Aux Clg Opt Vent Total COOLING COIL SELECTION AREAS HEATING COIL SELECTION Total Capacity Sens Cap. Coil Airflow Enter DB/WB/HR Leave DB/WB/HR Gross Total Glass Capacity Coil Airflow Ent Lvg ton MBh MBh cfm F F gr/lb F F gr/lb ft² (%) MBh cfm F F , Floor 88,381 Main Htg , Part Aux Htg ExFlr Preheat. Roof 53, Wall 37,913 7, Humidif... Opt Vent... Total Project Name: TRACE 7 v6. calculated at 4:27 PM on 8/22/27 Dataset Name: W:\1121\ACTIVE\ _AMVIC_ICF_SCHOOL_ENERGY_STUDY\CALCS\AMVIC_ICF_ENERGY.TRC Alternative - 1 System Checksums Report Page 1 of 1

16 System Checksums By Stantec Consulting Ltd. Distributed Heat Pump Fan Coil COOLING COIL PEAK CLG SPACE PEAK HEATING COIL PEAK TEMPERATURES Peaked at Time: Mo/Hr: 7 / 15 Mo/Hr: Sum of Mo/Hr: Heating Design Outside Air: OADB/WB/HR: 87 / 74 / 18 OADB: Peaks OADB: -1 SADB Plenum Space Plenum Net Percent Space Percent Space Peak Coil Peak Percent Return Sens. + Lat. Sens. + Lat Total Of Total Sensible Of Total Space Sens Tot Sens Of Total Ret/OA Btu/h Btu/h Btu/h (%) Btu/h (%) Btu/h Btu/h (%) Fn MtrTD.. Envelope Loads Envelope Loads Fn BldTD.. Skylite Solar Skylite Solar. Skylite Cond Skylite Cond. Fn Frict.. Roof Cond 92,292 92, ,31 11 Roof Cond -159, , Glass Solar 328,86 328, , Glass Solar. Glass Cond 36,149 36, ,653 3 Glass Cond -175,97-175, Wall Cond 29,28 29, ,74 3 Wall Cond -95,515-95, AIRFLOWS Vent 5 5 Infiltration 139,58 139,58 14 Infiltration -176, , Infil 2,275 Sub Total ==> 625, , , Sub Total ==> -67,4-67, Supply 37,93 37,93 Partition Exposed Floor Partition Exposed Floor.. Internal Loads Internal Loads MinStop/Rh Return 37,93 4,178 Lights 176, , , , Lights. Exhaust 5 2,325 People People. Rm Exh Misc Misc. Auxiliary Sub Total ==> 176, , , , Sub Total ==>. Ceiling Load Ceiling Load. Ventilation Load 2,791 Ventilation Load -3, Dehumid. Ov Sizing Ov/Undr Sizing. Ov/Undr Sizing Exhaust Heat. Exhaust Heat -1,21-1,21-1 OA Preheat Diff.. Sup. Fan Heat 2 RA Preheat Diff.. Ret. Fan Heat 2 2 Additional Reheat. Duct Heat Pkup Reheat at Design ENGINEERING CKS % OA.1.1 cfm/ft² cfm/ton ft²/ton 1,91.72 Btu/hr ft² No. People Grand Total ==> 82, , , , Grand Total ==> -67,4-61, Main Clg Aux Clg Opt Vent Total COOLING COIL SELECTION AREAS HEATING COIL SELECTION Total Capacity Sens Cap. Coil Airflow Enter DB/WB/HR Leave DB/WB/HR Gross Total Glass Capacity Coil Airflow Ent Lvg ton MBh MBh cfm F F gr/lb F F gr/lb ft² (%) MBh cfm F F , Floor 88,381 Main Htg , Part Aux Htg ExFlr Preheat. Roof 53, Wall 37,913 7, Humidif... Opt Vent... Total Project Name: TRACE 7 v6. calculated at 4:27 PM on 8/22/27 Dataset Name: W:\1121\ACTIVE\ _AMVIC_ICF_SCHOOL_ENERGY_STUDY\CALCS\AMVIC_ICF_ENERGY.TRC Alternative - 2 System Checksums Report Page 1 of 1

17 System Checksums By Stantec Consulting Ltd. Distributed Heat Pump Fan Coil COOLING COIL PEAK CLG SPACE PEAK HEATING COIL PEAK TEMPERATURES Peaked at Time: Mo/Hr: 7 / 15 Mo/Hr: Sum of Mo/Hr: Heating Design Outside Air: OADB/WB/HR: 87 / 74 / 18 OADB: Peaks OADB: -1 SADB Plenum Space Plenum Net Percent Space Percent Space Peak Coil Peak Percent Return Sens. + Lat. Sens. + Lat Total Of Total Sensible Of Total Space Sens Tot Sens Of Total Ret/OA Btu/h Btu/h Btu/h (%) Btu/h (%) Btu/h Btu/h (%) Fn MtrTD.. Envelope Loads Envelope Loads Fn BldTD.. Skylite Solar Skylite Solar. Skylite Cond Skylite Cond. Fn Frict.. Roof Cond 69,23 69, ,242 8 Roof Cond -119, , Glass Solar 328,86 328, , Glass Solar. Glass Cond 36,149 36, ,653 3 Glass Cond -175,97-175, Wall Cond 29,28 29, ,74 3 Wall Cond -95,515-95, AIRFLOWS Vent 5 5 Infiltration 139,57 139,57 15 Infiltration -176, , Infil 2,275 Sub Total ==> 62,9 62, , Sub Total ==> -567, , Supply 36,875 36,875 Partition Exposed Floor Partition Exposed Floor.. Internal Loads Internal Loads MinStop/Rh Return 36,875 39,15 Lights 176, , , , Lights. Exhaust 5 2,325 People People. Rm Exh Misc Misc. Auxiliary Sub Total ==> 176, , , , Sub Total ==>. Ceiling Load Ceiling Load. Ventilation Load 2,785 Ventilation Load -3, Dehumid. Ov Sizing Ov/Undr Sizing. Ov/Undr Sizing Exhaust Heat. Exhaust Heat -1,479-1,479-1 OA Preheat Diff.. Sup. Fan Heat 2 RA Preheat Diff.. Ret. Fan Heat 2 2 Additional Reheat. Duct Heat Pkup Reheat at Design ENGINEERING CKS % OA.1.1 cfm/ft² cfm/ton ft²/ton 1, Btu/hr ft² No. People Grand Total ==> 779, , , , Grand Total ==> -567, ,46 1. Main Clg Aux Clg Opt Vent Total COOLING COIL SELECTION AREAS HEATING COIL SELECTION Total Capacity Sens Cap. Coil Airflow Enter DB/WB/HR Leave DB/WB/HR Gross Total Glass Capacity Coil Airflow Ent Lvg ton MBh MBh cfm F F gr/lb F F gr/lb ft² (%) MBh cfm F F , Floor 88,381 Main Htg , Part Aux Htg ExFlr Preheat. Roof 53, Wall 37,913 7, Humidif... Opt Vent... Total Project Name: TRACE 7 v6. calculated at 4:27 PM on 8/22/27 Dataset Name: W:\1121\ACTIVE\ _AMVIC_ICF_SCHOOL_ENERGY_STUDY\CALCS\AMVIC_ICF_ENERGY.TRC Alternative - 3 System Checksums Report Page 1 of 1