This audit will allow you to understand how much, how and in which conditions you consume energy. It is an essential part of any energy renovation as it provides you with strategic plan of action (choices of 2 types of work to be done at the same time). You will therefore spend your money more effectively in order to maximise your return on investment and to optimise the energy performance of your buildings. The energy audit takes place in three steps : current situation, data analysis and action plan:
Step 1: Current situation
This phase includes a meeting with the project owner in order to agree on specific needs and expectations of the operation. This leads to data collection (building plans, energy bills, specifications, equipment list…) as well as a survey directed to users in the form of questionnaires, interviews and a visit to the site. The aim of this to achieve, with the technical manager of the building, an inspection of building conditions, climatic installations (heating, air conditioning, ventilation, domestic hot water…) and specific equipment, as well as an analysis of specific electric uses.
Step 2: Data analysis and energy balance
In a second phase, the collected data analysis provides a review of changes in consumption as well as supply and exploitation contracts. We then carry out modelling of the buildings and operating scenarios with the Dynamic Thermal Simulation (STD) software Pleiades + Comfie. This simulation defines heating, cooling and ventilation needs, as well as solar supply and thermal mass of the building. It is important to note that a dynamic thermal simulation is not necessarily required, but that a static simulation could be enough depending on the project. The STD allows hourly simulation of the thermal performance of the building. It is not always necessary to simulate this performance in a dynamic way, especially for buildings with high energy-consumption and little isolation. However, STD becomes necessary when needs in heat and cold decrease because thermal bridges or ventilation, for example become predominant vectors.
Step 3: Recommendation and action plan.
In this third phase, we provide a quantified and detailed study of different optimization solutions on the heating, cooling, domestic hot water production, air changes, the building envelope, optimization of lighting, specific use of electricity, water consumption, etc. Results are presented in a form of summary sheets including investment costs, energy and economic benefits, time of return of investment of the operation as well as energy savings certificates (CEE: certificats d’économie d’énergie) and other potentially allocated aids. All results are shown to the general contractor at the feedback meeting in an informative and pragmatic way in order to highlight all the ins and outs of the energy renovation project.
Dynamic Thermal Simulation
With this approach you can model a building using software like Pleiades + Comfie or TRNSys, integrating its envelope’s specifications, as well as theoretical operating conditions. Therefore it is possible to evaluate the influence of different materials and technical systems on needs of heating, ventilation and air conditioning. This method allows determination of the best architectural choices to achieve optimal temperature and comfort within inhabited premises.
The more economical in energy the building is the more the dynamic thermal simulation proves to be important. In fact, the STD becomes essential when effects like thermal bridges, tightness of envelope or solar supply, become preponderant in a high energy consuming building. In fact, these factors, which were insignificant because of more important isolation default, become of prime importance. The STD will quantify in advance the impacts of different architectural choices (influence on solar supply according to seasons) and the technical systems (performance, type) on needs in heating and cooling of the building (summer comfort).
The method of STD calculation involves studying over a whole year, or a defined period of at least few days, and on an hourly basis, the thermal performance of a building, either only of its envelope, or with technical systems. This calculation takes into account all parameters affecting the thermal balance: internal and external supply, building’s inertia, transmission through the walls, etc. The results of this calculation are temperatures, needs in heating and cooling and solar supply over the whole period of study and in each defined zone of the building. A STD calculation will enable us to optimise technical choices and architectural choices if appropriate, while ensuring improved comfort in your home.
Like all digital simulation, STD simulation is still a tool of which the results need to be interpreted cautiously. Common sense and experience help to verify consistency of results with the reality. Furthermore, the more hypothesis and reference models are relevant, the more reliable the results will be too. It is therefore necessary to analyse stringently the results in order to validate the different consumption objectives as well as architectural and/or technical systems.
Due Diligence Technique
The Due diligence technique includes an independent technical evaluation and consulting services before the realisation of solar installation projects, or after an operating dispute. The detailed measure and analysis of the whole data offer the maximum transparency and form a strong basis for your investment.
As part of the due diligence technique, we offer personalised services regarding evaluation and advice for your project. The basis of due diligence techniques are made from measures and analysis of all data for the installation and also from values of yield calculated with meteorological data and high precision radiation. Our independent experts measure and evaluate also the deciding factors for the planning, construction and operating phase. The concept of quality assurance and technical documentation are checked in terms of content and entirety. We analyse all contractual data, we develop proposals for improvements and we support you in giving you advice during your contractual negotiations.
Replacing an energy system requires thorough knowledge of technologies in order to not impair the current situation, but also to make the best choice on both technical and economical grounds.
The energy management is based on the norm ISO 50001. It enables implementation of a policy for energy management in order to reduce consumption, improve energy performance and lower costs related to energy.
It is first necessary to understand the energy consumption, to identify weak points, to establish a recommendation list, then to implement a coherent action plan that enable to initiate quickly the first actions which are often at low or no cost. The optimisation of synergies between reduction actions of will be one of the keys to success of the strategy of the energy management system.
Measures and Verification (IPMVP)
The IPMVP protocol involves implementing a monitoring system of energy savings realised via different projects. This protocol provides guidelines, definitions and an overview of the best practices in order to check the results of energy efficiency projects, water saving and renewable energy projects within commercial and industrial facilities.
Measuring : “We can’t control what we can’t measure”. To know how, how much and in which conditions you consume your energy is an essential step towards implementing solutions for reducing consumption.
Evaluating : Once you know how much and how you consume your energy, you can evaluate possible solutions according to your needs and context.
Improving : On this basis, you can then select and prioritize which actions to implement in order to reduce energy consumptions.
And start again : Once monitoring tools are operational, you can start the evaluation and improvement processes again in order to detect other energy saving sources.
As part of new construction or renovation projects, thermal regulation requires undertaking a regulatory calculation to certify the performance of the building and its compliance with regulations.
The regulatory calculation (thermal regulation 2012 or the current one) doesn’t have aim to help a building’s energy conception, but to make sure that the project conforms with regulatory standards set by government, in order to reach national objectives for reducing the energy consumption of new buildings stock.
This study is realised with certified software.
Energy project management
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