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S.1.4 Model for Energy Map Calculation

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SUNSHINE Project: model for energy map calculation

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S.1.4 Model for Energy Map Calculation

  1. 1. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) D6.4 S1.4 The Model for Energy Map Calculation „Building Energy Awareness”
  2. 2. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 1 - Problem analysis – laws The scope of the model is to estimate energy performance of buildings (EP). The model is based on European laws. Main laws are: EN 15217 indicates global indicators for the energy performance of whole building. EN 15603 indicates a general framework for the assessment of overall energy use.
  3. 3. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 2 - Problem analysis - EP In general, overall energy performance 𝐸𝑃𝑔𝑙 is calculated using the formula: 𝐸𝑃𝑔𝑙 = 𝐸𝑃𝑖 + 𝐸𝑃 𝐷𝐻𝑊 where Qℎ = Qℎ,𝑙𝑠 - γℎ,𝑔𝑛Qℎ,𝑔𝑛 STEPS : 1. Seasonal thermal energy 2. Annual Domestic Hot Water energy 3. For each terms calculate energy use in buildings referred to area. 𝐸𝑃𝑔𝑙 = 𝐸𝑃𝑖 + 𝐸𝑃 𝐷𝐻𝑊 + 𝐸𝑃𝑒 + 𝐸𝑃𝑖𝑙𝑙 In our model: 𝐸𝑃 = (𝑄/𝐴 𝑟𝑖𝑓) η 𝑠𝑦𝑠
  4. 4. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 3 - Heating energy request Qh - HDD is the Heating Degree Day. In general this value is calculated as accumulated differences between internal and external temperature. Energy need for heating 𝑄ℎ is given by EN 13790 «Energy performance of buildings: Calculation of energy use for space heating and cooling ». 𝑸 𝒉 = 𝟎, 𝟎𝟐𝟒 ∙ 𝑯𝑫𝑫 ∙ (𝑯 𝑻 + 𝑯 𝑽 ) - 𝒇 𝒙 (𝑸 𝒔+𝑸𝒊) ( 20 [°C] – 5,2 [°C] ) x 174 [d/a] = 2575 [Kd/a] T ExternalT Internal Heating days Heating Degree Day - Ht is the heat transfer coefficient by transmission. - Hv is the heat transfer coefficient by ventilation. 𝑯 𝑽 = 𝟎, 𝟑𝟒 ∙ 𝒏 ∙ 𝑽 Where V is volume of building and n the ventilation rate. 𝑯 𝑻 = (𝑨 𝒆𝒏𝒗,𝒊 ∙ 𝑼𝒊 ∙ 𝒃 𝒕𝒓,𝒊 ) + 𝚫𝑼 𝒕𝒃 ∙ ( 𝑨 𝒆𝒏𝒗,𝒊)
  5. 5. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 3 - Heating energy request Qh - Qs is the solar heat load during heating season. For example: Qs = ( 0,9 x 0,75 ) x 𝐀 𝒘𝒊𝒏𝒅𝒐𝒘 x I Non perpendicular Solar energy transmittance Energy need for heating 𝑄ℎ is given by EN 13790 «Energy performance of buildings: Calculation of energy use for space heating and cooling ». 𝑸 𝒉 = 𝟎, 𝟎𝟐𝟒 ∙ 𝑯𝑫𝑫 ∙ (𝑯 𝑻 + 𝑯 𝑽 ) - 𝒇 𝒙 (𝑸 𝒔+𝑸𝒊) Area window - Qi is the internal heat sources. Irradiation - fx is the gain utilization factor for heating. 𝑸 𝑰 = ( 𝜽𝒊𝒏𝒕 𝐱 𝐀 𝒇𝒍𝒐𝒐𝒓 𝐱 𝒉 ) ∶ 𝟏𝟎𝟎𝟎 Internal heat sources per unit area Area Heating hours fx = 0,95
  6. 6. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 3 - Heating energy request Qh Geometric values Si (Envelope element area) 𝐀 𝒘𝒊𝒏𝒅𝒐𝒘 (Window area) Volume Afloor (Area) Thermal values Ui (U-value) 𝚫𝑼 𝒕𝒃 (Thermal bridge) Climatic Data I (Irradiation) T External Heating days The model need several parameter for each building. How to calculate them ?
  7. 7. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 3 - Heating energy request Qh Buildings characteristics with age after 1900: data are estimated by TABULA project. By Tabula are estimated also climatic data. Some geometric values (such as external perimeter and floor area) are estimated by geometric shape file. Window area and thermal proprieties depend on buildings age, typologies and region.
  8. 8. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 3 - Heating energy request Qh Buildings characteristics with age before 1900: data from historical analysis of Ferrara University. From wall material (stone or brick) and average width of one building type, it is possible calculate wall width for each building. So we can calculate Heating energy request Qh Some geometric values (such as external perimeter and floor area) are estimated by geometric shape file. Window area and thermal proprieties depend on buildings age, typologies and region.
  9. 9. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) 4 – Domestic Hot Water 𝐐 𝑫𝑯𝑾 = ( 𝟏, 𝟏𝟔𝟐 x 𝑽 𝑾 x ( 𝜽 𝑯 − 𝜽 𝑪 ) x 𝟑𝟔𝟓 Volume DHW Energy need for domestic hot water 𝑄 𝐷𝐻𝑊 is given by EN 15316 series: “Heating systems in buildings - Method for calculation of system energy requirements and system efficiencies” temperature hot water Days temperature inlet Where: • Volume DHW is calculated directly on floor area [ l / day ] • Temperature hot water is 40 °C • Temperature inlet water is 15 °C 𝑽 𝑾 = a x 𝑨 𝒇𝒍𝒐𝒐𝒓
  10. 10. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) The energy model validation requires some considerations: • Not all energy certifications are based on the entire building; • Building age in the model isn’t always as real age; • We don’t know real refurbishment. 5 – Validation - Trento Difference between EPi – building with similar S/V
  11. 11. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) User can choose the location of the plan Use variable (with value 0 or 1) for the control of dispersant surfaces The energy model validation requires some considerations: • Not all energy certifications are based on the entire building 6 – Use 𝑸 𝒉 = 𝟎, 𝟎𝟐𝟒 ∙ 𝑯𝑫𝑫 ∙ (𝑯 𝑻 + 𝑯 𝑽 ) - 𝒇 𝒙 (𝑸 𝒔+𝑸𝒊) 𝑯 𝑻 = (𝜶𝒊 ∙ 𝑨 𝒆𝒏𝒗,𝒊 ∙ 𝑼𝒊 ∙ 𝒃 𝒕𝒓,𝒊 ) + 𝚫𝑼 𝒕𝒃 ∙ (𝜶𝒊 ∙ 𝑨 𝒆𝒏𝒗,𝒊) • Building age in the model isn’t always as real age • We don’t know real refurbishment User can choose the data for simulation
  12. 12. www.sunshineproject.eu SUNSHINE - Smart UrbaN ServIces for Higher eNergy Efficiency (GA no: 325161) Credits For more training material and courses visit http://www.sunshineproject.eu/solutions/training or contact us directly at training@sunshineproject.eu Source:www.unionegeometri.com Thank you! Marco Berti Fondazione Graphitech marco.berti@graphitech.it

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