I'm interested in developing effective interventions in building sector energy policies. Are certifications and energy labels well structured? Is it different to use dynamic simulation or simplified evaluations (under the point of view of the energy level or class obtained)? In some countries energy labels can be obtained by using both strategies, but simplified processes are commonly used. Will it be better to request dynamic simulation for each new construction or renovation?
Making standards can prepare a way to reach to the aim, starting the evaluation and giving certificate can make motivation to follow the rules so it cause to increase the environment friendly, i think it is necessary not enough
I think your question can be divided in two:
Labeling are important for a number a reasons, One being the information and awareness it produces. In that sense, it has a major role in facing climate change. Of course that the certification itself doesn´t produce any reduction on energy consumption. However, the increasing strigent regulations in thermal performance in buildings are already producing a significant reduction of consumption in building services. In my point of view, it is still too focused in new construction.
We have a pretty well structured certification scheme in Portugal. I think you can see more information about the different schemes here: http://www.epbd-ca.eu/.
In my point of view, dynamic simulations are more accurate and take in account a number of factors that simplified calculations obvioulsly not, but it is not feasible from the technical or economic point of view to produce dynamic simulations for every building being constructed or renovated. That being said, I believe that in some cases, energy performance are being over simplified and could result in higher classes obtained. In my opinion, you have to ask yourself: What is the purpose of energy certification in buildings? It is really worthy it to be that accurate? Or simplified calculations serve the purpose?
We have issued a book on this topic (in french...) and basically the idea is : for the new building, norms and standards are effective if all the industry knows that today and tomorrow the rules will be more and more stringent.
But for the existing stock... It is a nightmare because a lot of economic and governance issues arise...
1- what to do?
2- what are the real good techniques for my specific house-building?
3- how much it cost / gain? => how to finance it?
4- are the works properly done? and if not?
5- what could be the role of public intervention?
We propose a strategy for France, I don't if it will help, but you can have a look...
Thank You for your answers... In Chile the Dwelling Ministry is implementing a voluntary system of energy certification for new construction and mayor renovation, which permits a steady state evaluation and only in few cases (high values of transparency of the external surfaces) requires dynamic simulation using CCTE (DOE 2 based software). It seems to me that labels obtained by using dynamic simulation are more accurate and in some climates (like the desert ones) the difference between the methods is very high. Respect to existing dwelling, of course that decision of what kind of intervention is the difficult step. I belive that dynamical simulation will be helpful in taking decision like this.
In Lithuania we have EN ISO 13970 and other EPBD influenced standards, equation based monthly calculations for efficiency rating. While it is based on primary energy it looks like good influence to develop sustainable energy generation systems for microlimate needs.
In my opinion, based on other countries like Germany experience - there is no need for difficult calculations or dynamic simulations. Many things in heating dominated climates could be rated by simple heat balance based methods. But for cooling dominated countries - it is correct to use dynamic simulation.
Few years ago have heard an idea that energy rating must be simple and rational procedure to "measure" how more better are current building from typical buildings. Easy understandable and simple to calculate for architects, designers and planers, by creating oportunity to make better in simple way. So static methods based on eqations seems to be more "white box" solution while searching on improvement solutions instead of "black/grey box" dynamic simulation solution.
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