XV EUROPEAN CONFERENCE MILANO 7th-8thJUNE 2013 CSGLatest Technology in Refrigeration and Air ConditioningUnder the Auspice...
2Concept• Water-water high temperature heat pumps (Tsupply ≥ 60°C)may replace gas / oil fueled boilers in conventional rad...
Low temperature heat sourceLow temperature water may be provided by:•sea, lakes, rivers, canals;•unused pits;•shallow tabl...
The heat pump (TINA 115 kW)4
Heat pump characteristics• Two stage vapor compression cycle (workingfluid R 600 (n-Butane)Property ValueThermal power out...
6Central plant for space heating and SHW production70°CHT HP12°C7°C80°C
7Supply from water mains1"1/41" 1/41"1/41"1/4Supply from shallow table water
8AnalysisGENERATORI TERMODINAMICIAndamento degli investimenti0250.000500.000750.0001.000.0001.250.0001.500.0001.750.0002.0...
9Conclusions• Reduction of urban pollution associated to combustionheating plants.• Simple retrofit: boilers are replaced ...
Thank you for your attention!marco.masoero@polito.it10
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Marco Masoero - Politecnico di Torino - RETROFIT DI IMPIANTI DI RISCALDAMENTO ESISTENTI CON POMPE DI CALORE ACQUA-ACQUA

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Marco Masoero - Politecnico di Torino - RETROFIT DI IMPIANTI DI RISCALDAMENTO ESISTENTI CON POMPE DI CALORE ACQUA-ACQUA

  1. 1. XV EUROPEAN CONFERENCE MILANO 7th-8thJUNE 2013 CSGLatest Technology in Refrigeration and Air ConditioningUnder the Auspices of the PRESIDENCY OF THE COUNCIL OF MINISTERSRetrofitting existing heating systemswith water-water heat pumps fed bylow temperature water networksMarco Masoero, Chiara Silvi, Dipartimento Energia, Politecnico di TorinoGianfranco Pellegrini, AREA Science Park, Trieste
  2. 2. 2Concept• Water-water high temperature heat pumps (Tsupply ≥ 60°C)may replace gas / oil fueled boilers in conventional radiatorheating systems, which are common in Italian residentialbuildings.• The low temperature heat source is water distributed with adistrict pipework (LTDH Low Temperature District Heating).• The district pipework is easier to install and less invasivethan a standard high temperature DH one, since pipeinsulation is not needed.• A heat exchanger connects the primary network (LTDH) withthe evaporator of the heat pump.• The HP condenser produces hot water for space heatingand centralised SHW production (if present)
  3. 3. Low temperature heat sourceLow temperature water may be provided by:•sea, lakes, rivers, canals;•unused pits;•shallow table water;•urban or industrial water mains;•sewage systems;•……..3
  4. 4. The heat pump (TINA 115 kW)4
  5. 5. Heat pump characteristics• Two stage vapor compression cycle (workingfluid R 600 (n-Butane)Property ValueThermal power output 115 kWWater supply temperature 60 – 80 °CCOP 3.9 – 3.0Minimum water temperature 7°CWater flow rate 1.7 – 6.0 L/sMaximum electrical input 40 kW5
  6. 6. 6Central plant for space heating and SHW production70°CHT HP12°C7°C80°C
  7. 7. 7Supply from water mains1"1/41" 1/41"1/41"1/4Supply from shallow table water
  8. 8. 8AnalysisGENERATORI TERMODINAMICIAndamento degli investimenti0250.000500.000750.0001.000.0001.250.0001.500.0001.750.0002.000.0002.250.0002.500.0002.750.0003.000.00010 20 30 40 50 60 70 80 90 100Numero di generatori da installare(Generatore tipo da 100 kWt cadauno - Edificio tipo da 30.000 mc)Investimento[€]Costo centrali termicheCosto allacciamentiCosto reteInvestments vs. numberof heat pumpsYearly expenseGENERATORI TERMODINAMICIAnalisi economica0100.000200.000300.000400.000500.000600.000700.000800.000900.0001.000.00010 20 30 40 50 60 70 80 90 100Numero di generatori da installare(Generatore tipo da 100 kWt cadauno - Edificio tipo da 30.000 mc)Spesaannuariscaldamento[€]Spesa annua attualeSpesa annua previstaGENERATORI TERMODINAMICIAnalisi energetica - TEP risparmiati02004006008001.0001.2001.40010 20 30 40 50 60 70 80 90 100Numero di generatori da installare(Generatore tipo da100kWt cadauno - Edificio tipo da 30.000mc)TEP[TEP/anno]Stato di fattoStato di progettoTOE saved yearlyEmission reduction of CO2 Emission reduction of NOx
  9. 9. 9Conclusions• Reduction of urban pollution associated to combustionheating plants.• Simple retrofit: boilers are replaced by heat pumpswithout modifying the heating system.• Initial costs are balanced by reduction in energy billsand maintenance cost (35÷60%).• Payback time for Italy, based on climate and energyrates: per l’Italia: 3÷5 years, depending on fuel and typeof installation.• Solution applicable both to the existing stock(residential, historical buildings, schools, hospitals,commercial, industrial, etc.).• At least 70% of energy input is renewable.
  10. 10. Thank you for your attention!marco.masoero@polito.it10

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