NZEB Office Building including renewable energy ratio calculation orla coyle
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Presentation delivered at the NZEB Public Sector workshop held in the Aishling Hotel, Dublin, January 2017.
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NZEB Office Building including renewable energy ratio calculation orla coyle
- 1. NZEB OFFICE BUILDING INCLUDING RENEWABLE ENERGY RATIO CALCULATION
- 2. PAGE 1 WHAT IS EPC/ CPC/ RER It is an ASSET assessment not an operational assessment EPC – Energy Performance Coefficient MPEPC 1.0 Primary Energy Consumption of Proposed Building Primary Energy of Reference Building based on Interim Spec CPC – Carbon Performance Coefficient MPCPC 1.15 Carbon Emissions of Proposed Building Carbon Emissions of Reference Building based on Interim Spec Renewable Energy Ratio: RER > 20% Renewable Primary Energy Total Primary Energy including Renewable
- 3. 01 Insert divider title 3 A Insert divider title 7 CONTENTS CREATING THE REFERENCE BUILDING
- 8. PAGE 7 HVAC – CENTRAL HEATING WITH RADIATORS
- 9. PAGE 8 HVAC – AIR CONDITIONING
- 10. PAGE 9 HVAC – AIR CONDITIONING
- 11. PAGE 10 HVAC – AIR CONDITIONING
- 12. PAGE 11 LIGHTING
- 13. PAGE 12 LIGHTING
- 15. 01 Insert divider title 3 A Insert divider title 7 CONTENTS LESSON LANE
- 16. PAGE 15 PROJECTS Lesson Lane • 6500m2 7 storey plus basement Office Block in City Centre • Naturally Ventilated Offices - fresh air mechanically supplied with Heat Recovery • FCU in Meeting Rooms • Split System in Comms Rooms
- 17. PAGE 16 LESSON LANE – INTERIM SPECIFICATION Element Interim Specification Fabric Backstop Lesson Lane Fabric Roof U Value (W/(m2K)) 0.15 0.21 0.1 Wall U Value (W/(m2K)) 0.18 0.21 0.35 for insulated spandrel panel 0.1 for all other heat loss walls Floor U Value (W/(m2K)) 0.15 0.21 0.1 for all heat loss floor Thermal Bridging ACD ACD ACD Window U Value (W/(m2K)) 1.4 1.4 0.8 % glass of Exposed Façade 40% 60% 60% G-Value (%) 0.4 0.35 0.35 Light Transmittance (%) 0.71 0.55 0.55 Air Permeability (m3/(m2h) 3 3 1
- 18. PAGE 17 LESSON LANE – INTERIM SPECIFICATION Element Interim Specification Fabric Backstop Lesson Lane Lighting Lighting 65 Lumen/circuit watt with MF 0.8 LED (1.6 w/m2/100 lux) LED (1.6 w/m2/100 lux) Daylight Control Switching Dimming Dimming Occupancy Control Auto On/ Dim Auto On/ Off Auto On/ Off HVAC Heating 91% 92% 92% Variable speed control of fans and pumps Yes Yes Yes M&T - M&T on HVAC and Lighting M&T on HVAC and Lighting Cooling (air-conditioned) (SEER/SSEER) 4.5 SEER/ 3.6 SSEER 2.7 SSEER mixed mode 3.5 SEER/ 2.39 SSEER Mixed Mode cooling FCU - Meeting rooms 3.5 SEER/ 2.62 SSEER Cooling Split System in Comms Rm 3.5 SEER/ 2.39 SSEER Mixed Mode cooling FCU - Meeting rooms 3.5 SEER/ 2.62 SSEER Cooling Split System in Comms Rm
- 19. PAGE 18 LESSON LANE – INTERIM SPECIFICATION Element Interim Specification Fabric Backstop Lesson Lane Ventilation Demand Controlled S&E Fresh Air only to Offices and Meeting rooms with heat recovery S&E to WCs and photocopy with heat recovery Extract from tea station S&E Fresh Air only to Offices and Meeting rooms with heat recovery S&E to WCs and photocopy with heat recovery Extract from tea station Central Ventilation SFP (W/(l/s)) 1.8 1.5 1.5 Heat Recovery - 80% 80% DHW Hot Water Heater 91% 92% Natural Gas 92% Natural Gas DHW Tank 2000 litres 2000 litres 2000 litres Insulation on Tank 75mm 75mm 75mm Secondary Circulation Losses (W/m) 7 7 7
- 20. PAGE 19 PRIMARY ENERGY Heating , 38.1, 29% Cooling , 3.5, 3% Auxiliar y, 15.4, 12% Lightin g, 50.9, 39% Hot Water, 22.5, 17% INTERIM SPEC Heatin g, 29.3, 31% Coolin g, 5.1, 5% Auxilia ry, 13.8, 15% Lightin g, 28.8, 31% Hot Water, 17.1, 18% FABRIC BACKSTOP Heating , 10.8, 14% Cooling , 5.6, 7% Auxiliar y, 13.8, 18% Lightin g, 28.7, 38% Hot Water, 17.1, 23% CURRENT DESIGN
- 21. PAGE 20 INTERIM NZEB SPECIFICATION TOOL
- 22. PAGE 21 INTERIM NZEB SPECIFICATION TOOL
- 23. PAGE 22 INTERIM NZEB SPECIFICATION TOOL
- 25. PAGE 24 PHOTOVOLTAIC Interim Specification Fabric Backstop Lesson Lane Photovoltaic 623m2 500m2 385m2 kW 94 75 57.7 Photovoltaic Issues • Roof Space Requirement Roof Area approx 784m2 Allowing for overshading – 392m2 • Is peak load exceeding base load within building • Would you need to export electricity, associated costs
- 27. PAGE 26 SOLAR PANELS Interim Specification Fabric Backstop Lesson Lane Solar Panels 500m2 500m2 500m2 Solar Panel Issues • Limited by requirement for hot water • Limited by roof space • Additional storage volume required
- 28. PAGE 27 BIOMASS
- 29. PAGE 28 BIOMASS Interim Specification Fabric Backstop Lesson Lane % of Htg & DHW 55% 42% 55% Estimated kW 448kW 351kW 233kW kWh 191,802 112,306 88,360 Biomass Issues • Constant Thermal Base Load • Adequate Space for Storage • Access for delivery of fuel
- 30. PAGE 29 CHP
- 31. PAGE 30 CHP Interim Specification Fabric Backstop Lesson Lane % of Htg & DHW 100% 100% 100% CHP Issues • Is there a constant thermal load and electrical load, 100% of thermal load is not feasible • Location of plant
- 32. PAGE 31 BIOGAS CHP Interim Specification Fabric Backstop Lesson Lane % of Htg & DHW 50% 20% 25% CHP Issues • Is there a constant thermal load and electrical load, 15/20% of thermal load is feasible • Thermal Efficiency is reduced • Location of plant • Security of fuel supply?
- 34. PAGE 33 HEAT PUMP Interim Specification Fabric Backstop Lesson Lane % of Htg 100% 100% 100% % of DHW 0% 0% 0% Heat Pump Issues • Is it feasible to use low temperature installation – Use of FCU/ AHU? • Space requirements for plant • GSHP v ASHP
- 35. PAGE 34 HEAT PUMP 2 Interim Specification Fabric Backstop Lesson Lane % of Htg - - 100% % of DHW - - 100% Heat Pump Issues • Is it feasible to use low temperature installation – Use of FCU/ AHU • Space requirements for plant • GSHP v ASHP • Based on COP 250 for DHW • Hot Water temperature requirement for DHW to avoid Legionella
- 36. PAGE 35 HEAT PUMP & PV Interim Specification Fabric Backstop Lesson Lane % of Htg - - 100% % of DHW - - 0% Photovoltaic - - 200m2 Heat Pump Issues • Is it feasible to use low temperature installation – Use of FCU/ AHU • Space requirements for plant • GSHP v ASHP • Space requirement for PV
- 37. PAGE 36 LESSON LANE – RER SUMMARY Interim Specification Fabric Backstop Lesson Lane Photovoltaic Solar Panel Biomass CHP Biogas CHP Heat Pump Htg Only Heat Pump Htg & DHW - - Heat Pump Htg & PV - -
- 38. 01 Insert divider title 3 A Insert divider title 7 CONTENTS LESSON LANE – AIR CONDITIONED OFFICE
- 39. PAGE 38 LESSON LANE – TYPE OF SYSTEM? NATURALLY VENTILATED FAN COIL UNIT ACTIVE CHILLED BEAM Photovoltaic 385m2 800m2 550m2 EPC 0.58 0.85 0.62 CPC 0.59 0.88 0.64 RER 0.2 0.21 0.21
- 40. PAGE 39 ACHIEVING RENEWABLE WITHIN AC OFFICE? ACTIVE CHILLED BEAM ACTIVE CHILLED BEAM SPLIT Renewable 550m2 Photovoltaic 350m2 Photovoltaic with Heat Pump providing Heating 350m2 Photovoltaic with Heat Pump providing Heating EPC 0.62 0.64 0.61 CPC 0.64 0.66 0.63 RER 0.21 0.21 0.21