SRI assessment procedure
The SRI assessment aims to determine with sufficient reliability what services are present or planned in the building, and if so, the functionality level for each of those services.
Introduction
The final report of the second SRI technical study investigated three potential SRI assessment methods (i.e., Method A, Method B, and Method C). Method A and B are based on the assessment of the smart-ready services that are present, or planned at design stage, in the building or building unit and their functionality level. The assessment aims to determine with sufficient reliability what services are present or planned, and if so, the functionality level for each of those services. For this purpose, when available, digital models of buildings, including building information models or digital twins, may be used. The main difference is that Method A considers a reduced service catalogue, and thus spans a subset of the smart-ready services considered in Method B. Consequently, Method A requires less effort, time, and potentially expertise. By default, Method B would require an on-site inspection to the assessed object. Alternatively, Method C aims to be based on measured data, quantifying the operational smartness of in-use buildings.
Method A and B are methodologies included in the SRI assessment package produced by the SRI support team, whereas Method C is considered a potential future evolution. The generic process of the SRI assessment following Method A or B is outlined in Figure 3.
In principle, Method A allows building occupants to perform a self-assessment without the intervention of an expert. Nevertheless, such self-assessment won’t result in a valid SRI certificate.
In the following subsections, the SRI assessment procedure taking as reference Method B and the default calculation methodology will be explained.
Input data
Performing an SRI assessment requires the identification of general information of the assessed object as well as retrieving the inputs needed for the calculations, similarly to that required for the issue of energy performance certificates. The SRI assessment, as per the calculation spreadsheet developed by the SRI support team, requires the definition of certain input data, which can be structured according to the following:
- Assessor information.
- General building information.
- Methodology selection.
- Definition of applicability of smart ready service and main functionality level.
- Assessment date.
The input data regarding assessor information, the methodology selection, and the assessment data is trivial, and therefore not of interest in this document. The general building information contains items which correlate with overarching preparation steps for Energy Performance in Buildings (EPB) assessments. The definition of applicability of smart ready service and main functionality level is the core calculation methodology for the SRI. For each technical domain’s smart ready service, certain functionality levels may be defined. Such functionality levels are enabled by certain smart-ready technologies either present or planned at the building or building unit. Depending on the applicable smart service catalogue the input data gathering process may be variable in terms of time and effort needed. Furthermore, where they are available, digital models of buildings, including building information models or digital twins, may be used to increase the reliability and reduce the time of the assessment.
Calculation
Once the main functionality level has been defined to each applicable technical domain’s smart-ready service, the calculation proceeds as indicated in Key functionalities, impact criteria and technical domains.
Each smart-ready service $$(S_{i,d})$$ has a certain functionality level $$(FL(S_{i,d}))$$, which is equivalent to a score for each impact criterion (ἰc). The scores $$(I_{ic}(FL(S_{i,d})))$$ of each technical domain(d) and impact criterion are defined by Equation 1, as the sum of the scores of the smart-ready services within a given technical domain.
$$I(d,ic)\;=\;{\textstyle\sum_{i=1}^{Nd}}\;I_{ic}(FL(S_{i,d}))$$
Equation 1
The calculation is reproduced considering the maximum functionality level per applicable smart-ready service contained in the smart-ready service catalogue $$(FL_{max}(S_{i,d}))$$. It is indicated in Equation 2.
$$I_{max}(d,ic)\;=\;{\textstyle\sum_{i=1}^{Nd}}\;I_{ic}(FL_{max}(S_{i,d}))$$
Equation 2
It is possible to produce the smart readiness score per technical domain and impact criterion following Equation 3.
$$SR_{d,ic}\;=\;\frac{I(d,ic)}{I_{max}(d,ic)}\;.\;100$$
Equation 3
Next, the scores per technical domain are summed considering their respective contribution to each impact criterion. The result is divided by the maximum possible score, resulting in the smart readiness score per impact criterion $$(SR_{ic})$$ as per Equation 4.
$$SR_{ic}\;=\;\frac{\sum_{d=1}^N\;W_{d,ic}\;.\;I(d,ic)}{\sum_{d=1}^N\;W_{d,ic}\;.\;I_{max}(d,ic)}\;.\;100$$
Equation 4
Also, the smart readiness per technical domain, following Equation 5.
$$SR_d\;=\;\frac{\sum_{ic=1}^M\;W_{d,ic}\;.\;I(d,ic)}{\sum_{ic=1}^M\;W_{d,ic}\;.\;I_{max}(d,ic)}\;.\;100$$
Equation 5
The smart readiness score per smart readiness functionality(f) is obtained as the weighted addition of the scores per impact criterion as per Equation 6.
$$SR_f\;=\;{\textstyle\sum_{ic=1}^M}\;W_f\;(ic)\;.\;SR_{ic}$$
Equation 6
Finally, the total smart readiness score is obtained as the weighted addition of the scores per smart readiness functionality as in Equation 7.
$$SR\;=\;{\textstyle\sum_{}^{}}\;W_f\;.\;SR_f$$
Equation 7
For the calculation process, the contextual adaptations may have a significant impact.
The total smart readiness score corresponds to a smart readiness rating $$(SR_{class})$$, expressed based on seven smart readiness classes; namely, 90-100%; 80-90%; 65-80%; 50-65%; 35-50%; 20-35%; <20%, ranging from highest to lowest smart readiness.
Output data
The results of the SRI assessment are included in the SRI certificate. The output data of the calculations is depicted in Table 2.
Table of Content
$$SR_{f}$$
$$SR_{d}$$
History of the SRI
Understand how the SRI came into being and learn about the different policy instruments that made it possible.
SRI core methodology
The SRI core methodology defines the required framework for the calculation of the SRI.
SRI certificate
The SRI certificate defines the required information to be included in the certificate resulting from the SRI assessment by an expert.
SRI default calculation
The SRI support team has produced an SRI assessment package to facilitate the SRI testing and implementation in EU Member States.
