Gas Networks Ireland Technical Presentations- Part L
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The document discusses the presentation by Nutech Renewables on building cost-effective sustainable houses compliant with Irish regulations, focusing on passive solar housing technologies and their developments from 1983 to 2011. It evaluates the performance of various insulation and energy systems, including the patented Nutech solar enhanced heating system, which delivers significantly higher energy efficiency compared to standard systems. The findings emphasize the importance of build quality, energy performance requirements, and the potential for reduced running costs through advanced solar heating solutions.
Gas Networks Ireland Technical Presentations- Part L
- 1. Copyright NuTech Renewables 2011 Presentation for the GNI Conference for BER Assessors Dublin – 19th October 2016 Building Cost-Effective Sustainable Houses that comply with TGD L – 2011 Bill Quigley NuTech Renewables Ltd
- 2. Passive Solar Housing using Solar Collectors 1983 – 1988 The Knocklyon Project Designers: Bill Quigley / Mark Forkin (Directors of NuTech Renewables) Solar Roof – 40m2 of Air Solar Collector All fabric reasonably well insulated for the time Wall = 0.35; Floor 0.25 Roof = 0.20; Windows = 3.0 W.m2.K Tested numbers of different technologies – Rock Bed Heat Stores, Phase Change Heat Stores, Heat Pumps, etc. Space heating – 40 kWh/m2.year and reduced to 20 kWh/m2.year with best technologies
- 3. Copyright NuTech Renewables 2011 Some of the Findings from the Knocklyon Project • Levels of Ground Floor Insulation – B Regs changed • Thermal Bridging was eventually taken account of in the B Regs • Air Tightness testing is now mandatory – probably the 1st Blower Door test in Ireland – initial results were interesting! • A simple HRV system was tested • Rock bed heat storage? Phase Change material heat storage • Air-to-Air Heat Pump – solar assisted • Partial fill cavity wall insulation was a disaster!
- 4. Partial Fill Cavity Wall Insulation Effective Insulation ??? Cavity Wall Thermal Looping Outside 0 DegC 0 C Inside 20 DegC 20 C Calculated U-Value = 0.45 Actual U-Value = 0.9 ?
- 5. 0 5000 10000 15000 20000 25000 kWh/Year House as Designed Gross Space Heating Load = 10,000 kWh /yr House as Built Gross Space Heating load = 20 000 kWh /yr Solar Contribution = 5,000 kWh/yr House as Designed Net Space Heating Load = 5,000 kWh/yr Solar Contribution = 5,000 kWh/yr House as Built Net Space Heating Load = 15,000 kWh/yr Importance of Build Quality By Doubling the Energy Demand in reality We can Triple the actual running costs (£)
- 6. Copyright NuTech Renewables 2011 There has been rapid change in the requirements for complying with TGD L in the years 2005 to 2011 The new 2011 Regulations now require energy performance that is some 60% better than was required in the 2005-06 Regulations
- 7. Copyright NuTech Renewables 2011 The 2011 Regulations The 2011 Regs demands a CPC of 0.46 i.e. 54% better than the Reference House It also has to achieve an EPC of 0.4 i.e. 60% better than the Reference House It must also meet with the Renewable Energy Contribution of 10kWh/m2.year To satisfy all of these requirements is difficult BUT Various techniques have proved most useful
- 8. Copyright NuTech Renewables 2011 The 2011 Regulations First efforts were to add very high levels of insulation: Add a solar water heater also – still does not meet the EPC requirements
- 9. Copyright NuTech Renewables 2011 Insulation, Ventilation and Solar Thermal Energy World Sustainable Energy Conference – Feb 2014 1. Use Economic Levels of Insulation 2. Curiously South facing glazing should be double glazed and North facing glazing should be triple glazed! 3. Get the house reasonably airtight! Probably between 1 and 2 Air Changes per hour at 50 Pascal 4. Ventilate the house in an economic way! 5. Use large arrays of solar thermal collectors to deliver solar energy into the house for space and water heating
- 10. Copyright NuTech Renewables 2011 NuTech has developed and patented a technology known as the NuTech Solar Enhanced Heating and Hot Water system This system can quadruple the amount of solar energy delivered to the house when compared to a standard Solar Water Heater. It does this by effectively using a larger solar array and a slightly larger solar cylinder.
- 11. Solar Enhanced Heating & Hot Water Heats Hot Water Cylinder Fan Coil Radiator heats house with energy from the solar array Collects free energy Computer controlled
- 12. Copyright NuTech Renewables 2011 NuTech Pump Station Glen Dimplex Smart Rad Standard Twin Coil Solar Cylinder 300 t0 500 litre capacity Solar Collectors NuTech IRES Controller
- 13. Copyright NuTech Renewables 2011 Comparison of system efficiencies based on same area of collector
- 14. Copyright NuTech Renewables 2011 The patented plumbing arrangement with the motorised valves and the electronic control system are fitted adjacent to the hot water cylinder The NuTech Solar Enhanced Heating and Hot Water technology that interlinks solar collectors, hot water cylinders and house heating The IRES control box with the Consumer Display Unit attached and adjacent to the plumbing control board
- 15. Copyright NuTech Renewables 2011 Solar Enhanced Heating and Hot Water Linked to the Intelligent Renewable Energy System (IRES) controller Manufactured by NuTech Note: This unit allows the home occupier to know what the system is doing. The control of the system is fully automatic and no decision making is required of the home occupier
- 16. The following slides show the typical flow schematic of the Solar Enhanced Heating system with a Smart Rad delivering energy to the house
- 17. Solar Enhanced Heating - Flat Plate Collectors: Flow Diagram – Sunny Winter Day
- 18. Solar Enhanced Heating - Flat Plate Collectors: Flow Diagram – Cloudy Winter Day
- 19. Solar Enhanced Heating - Flat Plate Collectors: Flow Diagram – Winter Night
- 20. Copyright NuTech Renewables 2011 With this Technologies you can: • Build with easily achievable U-values in floors, walls, roof and windows and using standard construction methods • Use a gas or oil fired boiler with radiators or underfloor heating • Use a balanced flue gas fire or a glass fronted log stove • Satisfy the EPC, CPC and Renewable Energy Requirement as set out in Part L • Deliver up to four times the amount of solar energy to the house when compared to a standard solar water heating system All this in a single tried and tested affordable package
- 21. Solar Enhanced Ventilation & Hot Water Heats Water for showers Heats Ventilation Air for healthy home Collects free energy Computer controlled
- 22. Copyright NuTech Renewables 2011 Solar Enhanced Ventilation Get a large area of flat plate solar collectors on the roof Connect this array to the DHW Cylinder and the Air Handling Unit Air Extract from house by way of the airing cupboard and fresh air connected to AHU (this dries clothes in the airing cupboard quickly and reliably) Warm PIV ventilation air fed to the 1st floor and the ground floor
- 23. Solar Air Heating using Flat Plate Collectors: Flow Diagram – SUNNY WINTER DAY
- 24. Solar Air Heating using Flat Plate Collectors: Flow Diagram – SUNNY WINTER DAY
- 25. Technical Conclusions: 1. Doubling the area of collector does not double the cost of a Solar Heating system – the pump station, pipework, cylinder, controller and installation costs are all common 2. Doubling the area of collector on a standard Solar Water Heating system only results in a marginal increase in energy delivered to the house. This is because there is no way of storing or using the extra energy 3. By doubling the area of solar collector with the Solar Enhanced Heating and Hot Water technology we have a system that can absorb the extra solar energy throughout the days of autumn, winter and spring 4. Warming the house air holds the solar collector system efficiency in excess of 60% throughout all of the day 5. Doubling the area of solar collector with a larger hot water cylinder gives the best results in terms of both Energy and CO2 savings 6. Using this Solar Enhanced Heating system is the best way of utilising low grade solar energy and delivering it as useful heat to the house 7. Having the larger solar cylinder is a good way of storing solar energy for evening use. The NuTech system takes the energy out of the solar cylinder in the evening and delivers energy to the house. It is entirely separate to the heating system of the house.
- 26. Technical Conclusions (Cont’d) 8. Delivering solar energy to an underfloor heating system is not nearly as efficient as the SEV-PIV system. As soon as the heating system comes on the solar underfloor is switched off 9. The SEV – PIV technology makes the much lower cost flat plate collector as efficient as the expensive evacuated tube collector 10. In light cloudy weather the SEV – PIV system continues to deliver solar energy to the house. In these conditions the standard Solar Water heating system is off 11. Ventilation is necessary. It causes as much energy use as the energy required to combat heat loss through the fabric 12. By adding the NuTech SEV – PIV system with 5 Flat Plate collectors and a new larger hot water cylinder we can deliver in excess of 6,000 kWh to the house 13. This is 4X the amount of energy that would be delivered by a standard solar water heating system 14. This well ventilated house is a warm, comfortable, healthy house free from condensation and mould growth
- 27. Comparison 3/4 Bed Semi-Detached - Heat Pump Vs Gas-Nutech system Heat Pump Energy Calc based on SEAI model kWhs per year CO2 (kg/year) CPC EPC Space Heating 1220 637 0.418 0.397 Hot Water 1157 604 Total CO2 per year 1241 Cost Analysis 17.82 c/kWh Day Rate 21.83 c/kWh Night Rate 10.02 c/kWh Space Heating 217.40€ Avg at 66% Day Rate Avg cost for electricity = 17.82 c/kWh Water Heating 206.18€ Total Cost per year for Heat P 423.58€ NuTech Solar Enhanced Heating Energy Calc based on SEAI model kWhs per year CO2 (kg/year) CPC EPC Space Heating 3346 680 0.368 0.397 Hot Water 1510 307 Total CO2 per year 987 20% Lower CO2 Emissions Cost Analysis 7.45 c/kWh Gas Band D2 7.45 c/kWh Space Heating 249.28€ Gas Band D3 6.74 c/kWh Water Heating 112.50€ Total Cost per year for Gas / 361.77€ 15% Lower Running Costs than the Heat Pump system NuTech Solar Enhanced Heating - Actual Case Energy Calc Based on experimentation and University of Ulster Tests Space Heating 2406 Hot Water 1510 Cost Analysis 7.45 Space Heating 179.25€ Water Heating 112.50€ Total Cost per year for Gas / 291.74€ Actual Case will be 31% Lower Running Costs than the Heat Pump system
- 28. Copyright NuTech Renewables 2011 Thank you for listening……… Bill Quigley Office in Dublin Tel: 01 663 63 72 Mobile: 086 88 363 99 e-mail: bill.nutech@gmail.com www.nutechrenewables.com