About SitePass

The original aim of this blog was to contribute to a collaborative learning space for Passive House Design and Construction in Ireland. It has been funded by the National Academy for the Integration of Research into Teaching and Learning (NAIRTL). This is a continusing collaborative effort between the Department of Building and Civil Engineering at the Galway-Mayo Institute of Technology and industry partners, Passive House Builders and McGann Scahill Architects.

I have decided to expand the purpose of the SitePass blog by using it as a learning space for all issues related to future building solutions for a resource efficient society. It still will contain relevant Passive House design and construction posts but will now include the wide range of issues related to future building solutions and resource efficiency.

A conversation with Daniel Schrag hosted by the Ryan Institute in NUI, Galway

The Ryan Institute at NUI, Galway hosted a ‘conversation’ with Professor Daniel Schrag, Director of Harvard Centre for the Environment and member of President Obama’s Council of Advisors on Science and Technology and Dr. Henrike Rau, a lecturer in Political Science and Sociology at NUI, Galway and leader of the Ryan Institute’s Socio-Economics and Policy priority research area on Thursday, the 14th of February 2013 in what was a very informative and pragmatic discussion on the challenges that lie ahead in addressing climate change. Professor Schrag was in Ireland to attend the Climate Gathering meeting hosted in the Burren College of Art over the weekend of the 15th to the 17th of February. Proceedings started with an introduction by Professor Colin Brown , who gave a brief overview of the activites of the Ryan Institute and introduced Professor Schrag and Dr. Rau. Professor Schrag then gave an overview of some issues that needed to be considered when discussing climate change. He outlined three themes that demonstrated the enormous challenges: the use of short-term versus long-term targets; the ability to have a sustained political will to address climate change and how this affects public attitudes and behaviour; the trade-offs to be made when considering alternative solutions; and the understanding of uncertainty.

Short-term versus long-term targets

Professor Schrag believes that there is too much focus on short-term targets. This manifests itself in thousands of hours wasted by eminent scientists and politicians in trying to come up with target figures of 17 or 22 per cent by 2020 or 2030. Whether it is 17 or 22 per cent by 2020 has an negligible effect on actually moving towards a zero carbon society. This sounds paradoxical but is framed within a long-view of the effect of carbon emissions as outlined by Professor David McKay in his excellent book ‘Sustainable Energy-without the hot air’. When trying to identify who is reponsible for climate (and therefore who should pay for it based on the ‘polluter pays principle’), Professor McKay points out that it is not the rate of CO₂ emissions that is important but the cumulative total emissions because much of the emitted carbon dioxide (approximately 30 per cent) will hang around the atmosphere for at least 100 years (Professor Schrag estimated even longer timeframes). This hightlights the need for us to ‘extend our time horizons’ as suggest by Sir Martin Rees, President of the Royal Society and master at Trinity College, University of Cambridge in his article in the fantastic book ‘This will make you smarter: new scientific concepts to improve your thinking’ edited by John Brockman. Professor Rees points out no astronomer could believe that we are the culmination of evolution as it is plausible that we are only at the half-way stage. Professor Schrag pointed out the difficulty with this long-term view by suggesting that whatever measures we take today will not make any real measurable difference until 2113 and beyond.  

In response to these comments, Dr. Rau acknowledged Professor Schrag’s reservations on short-term targets but still felt that they had a role to play in ‘shifting the discourse’. She cited 2008 Eurobarometer data, which suggests that people are concerned about climate change (57 per cent respondents ‘concerned’) but there is not reflected in the percentage of people who are willing to act, demonstrating that attitudes do not directly influence or inform behaviour. This directly relates to the next main theme of ‘how to develop a sustained political will?’

Developing a sustained political will to tackle climate change

Much of debate around the ethical and moral obligations of humanity in regard to climate change can be diluted by the language used and how it is interpretated resulting in the general population engaging with the issues or distance themselves from the issues and responsibility. Professor Schrag illustrated this point when discussing the climate change ‘adaptation and preparedness’ approach. The ‘adaptation’ approach would seemed to us to be a practical intermediate solution based on the acceptance that climate change is happening and we as a species will need to ‘adapt’ in some way. But put it in the context of the George W. Bush’s administration, this term defined a strategy of inaction informed by the belief of whatever is going to happen, we will be able to ‘adapt’ to it using our human ingenuity, thereby surviving more or less intact. Interestingly, recent extreme climate events in the US do seem to be having an influence on general public opinion providing a basis for a political will. The recent devastation of Hurricane Sandy in New York coupled with severe droughts throughout the US and the recent blizzards conditions in many states has come at a great personal and financial cost to a country still trying to pull itself out of the curent economic downturn. Professor Schrag pointed out that flood insurance in the US is subsidised by the government as the private sector do not want to deal with it. This could be seen as subsidising habitation patterns in areas under threat i.e. coastal communities and cities but what other choice do they have? An interesting suggestion was that if buildings are unfortunately affected by flooding and other extreme weather events, then the rebuilding costs should be provided only if resilient engineering strategies are implemented. This, then introduces the concept of ‘preparedness’ into these communities and may influence behaviour.

Professor Schrag pointed out that the climate change deniers lobby have been very clever in associated climate change values to issues of ‘big government’, increased taxes and the interference in people’s everyday lives. This is an astute approach as some environmental experts believe that the proof of President Obama’s commitment to tackle climate change during his inaugural address will be in the introduction of a carbon tax. Of course, this has to pass through Congress and President Obama does not control Congress so he does not have the ability to deliver a carbon tax demonstrating the difficulties that the President is facing. Despite this, Professor Schrag does believe that America has a huge role to play in addressing world emission especially when you consider the rise of China. US emissions are actually down about 9 per cent to 16 per cent of world emission whereas China continues to increase. If you put both the countries together, you may come up with around half of all the world’s emissions. Professor Schrag believes that if America does not do something to address their emissions, then China will do nothing. Following on from this, he believes that if America and China did come together and demonstrated a real willingness to reduce their emissions, then everybody else would follow including the EU. This may be a parochial view but it is one with some merit because if you can focus on the the big gains first then smaller ones should follow with less effort. Of course, this is has a high degree of complexity as climate change cannot be removed from issues such as global health, poverty, equality etc. A lot of the political will is currently being influenced by what alternative technologies are available.

  

Alternative Technologies and Trade-Offs

The US has committed to provide 3000 GigaWatts of new electrification with increased efficiency over the next 30 years. Professor Schrag points out that this is a very ambitious target considering that 106 GigaWatts of power in US is currently provided by nuclear energy, which is due to be exhausted by the middle of the century. He mentioned the electrification of the transportation sector as a plausible solution if technology improve considerably with some potential in fuel cell technology. In fact, he believes the path to a zero carbon economy will not be a steady progression and expects certain technology peaks to occur. The coal industry in the US is coming under increasing pressure from alternative technologies such as fracking and shale gas extraction. This can be seen in the provision of electricity from coal-fired plants dropping from approximately 50 per cent five years ago to 38 per cent today. His discussion on fracking and shale gas extraction was an interesting one as it focused more on public perception than the technologies involved. Professor Schrag accepted that the extractive process is a ‘dirty’ one but gave the example of Texas, where fracking has been taking place for the past decade without any complaint. This is due to the fact that Texans are used to the extractive industries. Fracking only hit problems when it moved to areas that were not familiar with these processes, which in turn, generated a groundswell of opposition against such technologies, which has now developed internationally. In Professor Schrag’s opinion, it does provide an alternative ‘cleaner’ option than traditiona coal-fired plants. This is interesting considering the Irish situation, where the extraction of shale gas would not be replacing coal-fired plants but would be replacing imported gas. So it will be gas replacing gas, so it is not really providing a ‘cleaner’ alternative especially when you consider the environmental impacts of the extractive process. But then a comparative analysis of the economic benefits must be carried out to identify the potential trade-offs.

This was a theme running throughout the discussion, that Professor Schrag took a very pragmatic view of potential solutions and nearly always grounded them in economic terms. Other alternative technologies mentioned were carbon capture and storage, a ‘clean’ nuclear solution (if one exists), the use of solar technology especially photovoltaics, which have seen a dramatic drop in cost over the past five years moving it towards being a viable alternative. Returning to the issue of target timelines, one of the reasons Professor Schrag is not a huge fan of short-term targets is that they distract attention (and funding) away from technological solutions that need huge investment to achieve long-term goals e.g. carbon capture and storage.

'Fabric First' Training Day with Ecological Building Systems

We had a great day up in Athboy yesterday when the students from the M.Sc. in Environmental Systems in GMIT attended the 'Fabric First' training day with Ecological Building Systems. Many thanks to Niall and Roman for an excellent day of presentations and practical work (photographs below show Niall and Roman demonstrating different aspects to the students yesterday).

Roman demonstrated in the Airtightness Demonstration Area

Niall giving some tips on selection of insulation strategies

Niall demonstrates some considerations in more difficult applications

Roman highlighting the importance of accuracy when installing airtightness membranes

Ecological Building Systems continue to be at the forefront of knowledge in the area of airtightness and thermal insulation and their training facility is a fantastic resource for anyone involved in the construction sector. The course is highly recommended and provides a mix of interesting presentations on the different aspects of low energy building fabric design, personal experiences and lessons learned from completed and ongoing project and demonstrations of practical work in the training centre (photographs below show some of the details on show in the training centre).

Airtightness membrane application demonstration area

Passive Eco Wall Detail

WinCon Model House

Mechanical Heat Recovery Ventilation Systems, Design Workshop and Certification Procedures

To finish up the module this semester, I would like to thank David McHugh from ProAir, who gave a very informative talk on mechanical heat recovery ventilation systems to the M.Sc. class and Year 4 of the B.Sc. in Architectural Technology. Passipedia again provides an excellent starting point when examining the ventilation and heating requirements of a passive house. Some key points when considering the design and installation of a mechanical heat recovery ventilation systems are: 75% minimum efficiency requirement; total ventilation electricity demand to be not greater than 0.4Wh/m3; uncertified (by the Passive Institute) HRV system must take 12% off the product efficiency figure. The latest video produced by Energy Quarter on HRV systems in passive houses seems to have been taken down off YouTube but I will post it as soon as it becomes available.

Also, many thanks to Cathal Spellman of passivehouseplans.ie for coming in and hosting the design workshop where the students had the opportunity to discuss their project proposals. Cathal gave a clear outline of the reasons he decided to branch into the area of passive house and how this has created some new business for the company.

Finally, some information on the procedures for applying for certification are provided by the wonderful resource that is Passipedia.

Week 10 Pecha Kucha and Poster Presentation for next week

In preparation for both the Pecha Kucha session and your poster presentation, have a look at the following resources: NUI, Galway have put together a nice site providing design tips for poster presentations including some useful videos; Colin Purrington's section on poster design has a number of good tips and links; the Cornell Centre for Materials Research have some good points in this presentation although I would not worry about picking a software program as PowerPoint should do fine. Have a look at the following videos for some useful guidance but remember that we want an A0 poster in portrait not landscape.

For the Pecha Kucha, remember what I said in class...practice makes perfect. Have a look at the homepage to browse through some of the resources available. We might even video you next week if you are really good. The main aim is to have a bit of fun but also to avoid 'Death by PowerPoint' as the following videos demonstrate.

Week 9 Blog Assignment 2 - Case Studies

This week, the students were assigned their second blog assignment, which is to provide a critical review of a passive house built anywhere in the world. We have a number of case studies from last years class including:

• An Estate in Hannover Kronsberg
• The Denby Dale Passive House
• The Smith House in Urbana, Illinois
• Eco Arch House in Kent
• Another link to the Estate in Hannover Kronsberg
• Glencullen, Co. Wicklow
• The Underhill Passive House in the Cotswolds
• Passive House in Bessancourt, France 
• Bla Jungfrun in Stockhold, Sweden
• The Go Passive House in Maine   

So this year, the students will produce another set of passive house case studies. The passive house database is a good starting point.

Week 9 Blog Assignments

The students submitted the following blog assignments on various articles related to the passive house concept:

• Shay blogged on Passive House: Achievable Concepts for Low Carbon Housing
• Jan blogged on Detailed Energy Saving Performance Analyses on Thermal Mass Walls
• Kevin blogged on the Study of Primary Energy Implications of Mechanical Ventilation with Heat Recovery in Residential Buildings
• Anthony blogged on the Performance Characteristics and Practical Applications of Common Building Thermal Insulation Materials
• Eimear blogged on Traditional, State-of-the-Art and Future Thermal Building Insulation Materials and Solutions - Properties, Requirements and Possibilities
• John blogged on CEPHEUS and the measurement results from more than 100 units in passive houses
• Kieran blogged on the Environmental Impact of Optimum Insulation Thickness for External Walls of Buildings
• Henrik blogged on Embodied and Operational Carbon Dioxide Emissions from Housing
• Diarmuid blogged on the Impact of Thermal Bypass
  

Week 8 Passive House Windows and Doors Prezi

Here is the Prezi version of today's lecture. Check Moodle for details on a virtual webinar that is taking place this evening on 'Designing Plant for Passive House', which should be worth a look.

Week 8 Mechanical Heat Recovery Ventilation Systems Pre-Lecture Resources

Unfortunately, David McHugh of ProAir will not be able to make it in this week but is hoping to make it in next week. This will give us an opportunity to go through the basics of passive windows and doors and heat recovery ventilation systems in class. Have a look at my previous post to refresh your memory on passive windows and doors. Last week, we did mention blower door testing during Tom O'Dwyer's guest lecture. Passipedia has an excellent section on ventilation and why it recommends the exhaust fan system. Michael Hayes of RVR Technology provides a nice introduction to mechanical heat recovery ventilation systems in the videos below.

 

And check out Bill Butcher's discussion the their selected ventilation system on the Denby Dale Project.

 

We will have the opportunity to listen to another guest speaker on Tuesday because Aidan Malone will be giving a talk to the 4th-year architectural students on the design and sustainability strategy of the GMIT library in 1041 at 12.30 followed by a tour of the library and we have been invited to tag along.

Week 7 Airtightness Post Guest Lecture Resources

Many thanks to Tom O'Dwyer (in the photographs below) from SIGA who gave an excellent talk and demonstration of airtightness considerations when using different construction methods and materials to the M.Sc. students and final-year Architecture students.

Please refer to my previous blog post for some more detailed information on airtightness and SIGA products. Have a look at this article which discusses the importance of airtightness from a Passive House point of view. The Energy Saving Trust in the UK have produced nice guidelines on improving airtightness in dwellings that is worth a look and of course our own Department of the Environment, Local Community and Government has produced a document on air infiltration and thermal bridging as a supplement to the Building Regulations. Gavin O'Shea of GreenBuild has also produced an excellent document on blower door testing for passive houses. See below the video shown in class on how to carry out a blower door test.

Week 7 Passive House Airtightness and Windows Pre-Lecture Resources

I am really looking forward to having two guest lectures in this week: Tom O'Dwyer from SIGA and Thomas O'Reilly from SmartWin. SIGA have a host of resources on their website including a dedicated YouTube channel. I especially like the comic they produced 'Building Damage Horror..and how to prevent it'. They have also developed a 'construction feature' section where you can click into different applications that will link the product information to installation videos. SIGA were recently involved in the construction of the Irish Rail Train Drivers Building in Portlaoise. SmartWin have recently received their passive certification for their window products. For more information on Passive Windows check out Passipedia and the videos developed by Energyquarter in Ireland and the Green Building Store in the UK.

The 3D detail was produced by Gerard Nicholson as part of a REVIT Summer Competition in GMIT.

Week 6 Site Visit to Timbertech Homes and Ecological Building Systems

Yesterday, we had a fantastic day out visiting a Timbertech Homes development in Straffan, Co. Kildare and Ecological Building Systems in Athboy, Co. Meath. Fergal O'Malley of Timbertech Homes gave us an excellent talk and tour of a timber frame house development consisting of 3 different house types (photographs 1 & 2). He highlighted the main considerations that were taken into account when aiming for low energy construction on a competitive budget.

Photographs 1 and 2  Fergal O'Malley giving his talk to the M.Sc. Environmental System students

 Fergal was ably assisted by Peter Smyth of Ecological Building Systems who came out to the site to discuss the importance of airtightness on site and discuss some of the airtight details that were used on this project (Photographs 3, 4 and 5).

Photographs 3, 4, 5  Airtightness detailing on Timbertech Homes Development

This site visit was followed up by a visit to Ecological Building Systems new training centre, which is a fantastic addition to the knowledge base in Ireland. The centre is still under construction and is due for its official launch in the new year but we got a sneak preview. Niall Crossan, as always (photograph 6) gave us and excellent overview of the different materials and building systems currently available, particularly focusing on airtightness, thermal performance and the control of moisture both in new building and refurbishment projects.

Photograph 6  Niall Crossan of Ecological Building Systems giving his talk to the M.Sc. students

The learning centre has an excellent array of large (photographs 7 and 8) and small detail sections (photographs 9 and 10) as well as a fully kitted house to demonstrate a preliminary airtightness test using the Wincon apparatus (photographs 11 and 12). 

Photographs 7 and 8 showing the large detail sections on show in the Ecological Building Systems Training Centre

 

Photographs 9 and 10 showing the small detail sections on show in the Ecological Building Systems Training Centre

Photographs 11 and 12 showing the Wincon House

All-in-all, it was a great day out for all the students. Many thanks to Fergal, Peter and Niall for all their help.

International Passive House Open Days 2011

This week is International Passive House Open Day week, where passive houses across the world open their doors to the general public. I am delighted to report that there are a number of houses open around Ireland. Cyril Mannion of Passive House Builders is hosting an open day on Saturday the 12th of November at two of his projects, in Athenry and Salthill. Both are well worth a look.

Week 6 Airtightness and Thermal Imaging Pre-Lecture Resources

In preparation to our site visit to Timbertech Homes Ltd. and Ecological Building Systems on Wednesday, please have a look at the previous posts on airtightness from earlier in the module and from last year's visit by Peter Smyth of Ecological Building Systems. Also, Passipedia has a nice concise section on airtight construction. This article also gives a detailed overview of airtight construction and testing and don't forget the guidelines issued by the Department of the Environment, Communities and Local Government. Energyquarter have also put together a nice two-minute video of the basic principles involved starring Niall Crossan of Ecological Building Systems.

Week 5 External Walls and Roof Systems Post-Lecture Resources

Here the Prezi version of the lecture today. Enjoy!

Week 5 External Walls and Roof Systems Post-Lecture Resources

Today, we looked at a number of different systems both for external wall and roof systems. The excellent series of videos from the Green Building Store in the UK again provided an excellent comparative viewpoint using traditional construction methods.

The following 3D images of the external walls and roof details (developed by Gerard Nicholson) of the Denby Dale Passive House provide a nice summary.

We also had a look at alternative solutions such as Insulated Concrete Formwork and Structurally Insulated Panels (SIPs) and what role they might play in the design and construction of a passive house. And just when you thought that external insulation was the solution to all your passive problems, Niall Crossan of Ecological Building Systems highlights some issues to watch out for.

Week 5 Blog Assignment 1

The first blog assignment will involve a critical review of an assigned paper in the area of Passive House Design and Construction. The following is the allocation:
1. Henrick Kolberg    
A Case Study on the Effects of Thermal Mass and Climate Change

2. Eimear Hassett 
Traditional, State of the Art, and Future Thermal Building Insulation Materials

3. Diarmuid O' Ceidigh
Impact of Thermal Bypass

4. Jan Gottsche      
Energy Saving Analysis on Thermal Mass Walls

5. John Carroll       
CEPHEUS Measurement Report on 100 Houses

6. Shay Walsh            
Achievable Concepts for Low Carbon Buildings

7. Kevin Cunningham
Primary Energy Implication of Mechanical Heat Recovery Ventilation System


I will post the blog post brief and rubric on Moodle.

Week 5 External Walls and Roof Systems Pre-Lecture Resources

This week we will have a look at a number of different thermal envelope options available, concentrating on external wall and roof systems. I refer to again to Energy Quarter's excellent video on the thermal envelope that was in the pre-lecture resources for week 3. The Passive House Institute also provide some useful guidance on thermal insulation requirements on different systems. Below is a video from the RTE programme 'About the House' hosted by Duncan Stewart, which highlights the use of recycled cellulose insulation in a timber frame house in Sligo.

Duncan has featured recycled cellulose insulation in a number of episodes.

Another system used in passive house design and construction is external wall insulation. Here Duncan (again!) looks at external insulation in a refurbishment project.

Week 4 Foundation Systems Post-Lecture Resources

In today's class, we looked at a number of different systems available for foundations, rising walls and ground floors. Energyquarter.ie have produced an excellent video on this highlighting the importance of thermal bridge free design.

 

Some of the products mentioned by Tomas O'Leary to minimse thermal bridging included an aerated low U Value block e.g.  Quinnlite block (as used by Viking Homes). Another interesting element was for the insulated cantilevered solution for balcony construction. Foamglass was also introduced as a viable thermal break alternative to a standard block rising wall construction. We then looked at the Denby Dale project in the UK, which used traditional construction techniques to achieve the passive standard.

The 3D model was developed by Gerard Nicholson as part of an architectural competition we held in the Department of Building and Civil Engineering over the summer (2011).

Week 4 Foundation Systems Lecture

Following on from today's class, please find the presentation in Prezi for your viewing pleasure!