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Valsuani - 15° Convegno Europeo CSG Presentation Transcript

  • 1. ISAHP: INTEGRATED SOLAR ASSISTED HEAT PUMPS OPERATED WITH ISOBUTANE (R600A) L.A. Tagliafico, F. Scarpa, G. Tagliafico, F. Valsuani, C. Rossi Dott. Ing. Federico VALSUANI From conception to prototype Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 1
  • 2. SYSTEM DESCRIPTION - ISAHPThe direct expansionintegrated solar assistedheat pump (ISAHP) waterheater consists of a Rankinerefrigeration cycle whereunglazed flat plate solarcollectors act as anevaporator for the refrigerant(R600a).The condenser is coupledwith a water storage tank inorder to cover the energyuser demand. innovative device for building integrated applications Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 2
  • 3. Purpose:• Increase the panel efficiency keeping the panel temperature lower than traditional solar system; flusso utile FLUSSO UTILE [W/m2]• Increase the COP of the heat pump 800 working with higher evaporator temperature; 600 W/m2 tradizionale 400 innovativo• Reduce the panel costs using 200 unglazed panel. 0 5.30 7.30 9.30 11.30 13.30 15.30 17.30 8 novembre 2005 DIAGNOSI E CERTIFICAZIONE ENERGETICA DEGLI EDIFICI 3/35
  • 4. EFFICIENCY - ISAHP G=800W/m2, h=10W/m2 °C) G=800W/m2, h=10W/m2 °C TRADITIONAL SOLAR PANEL lower panel temperature and lower heat losses toward the ambient Higher efficiency Integrated panel efficiencyTraditional panel efficiency G=900W/m2, U=15W/m2 °C 𝜀𝐺 − ℎ ∆𝑇 𝜂= 𝐺 PSIPC Fiera Rho Milano, 28/03/2012 L.A. Tagliafico, F. Scarpa, G. Tagliafico, F. Valsuani, C. Rossi 4
  • 5. FLUID – R600a A full design has been performed and R600a resulted the best operating fluid.The use of natural refrigerants, such as R600a – isobutane, is interesting for its lowenvironmental impact (ODP = 0, low GWP) when used in a high efficiency system(low energy consumption, low TEWI) .The range of pressure and Temperature of R600a fits the working condition of R134asystems. The use of R600a is consistent for small and medium device because of the explosive hazard for bigger devices. CE 1272/2008: Isobutane - Category 1 - H220 (High flammability) Lower Explosion limit (LEL) 1.5 % Approx 38 g/m3 Upper Explosion Limit (UEL) 8.5% Approx 203 g/m3 Minimum ignition temperature 460 °C Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 5
  • 6. Thermodynamic cicle for R600aWinter (space heating+DHW) Summer (DHW) Enthalp Temperature Pressure Density y Quality Temperature Pressure Density Enthalpy Quality (C) (MPa) (kg/m^3) (kJ/kg) (kg/kg) (C) (MPa) (kg/m^3) (kJ/kg) (kg/kg)1 5 0,19 5 561,74 1 1 25 0,35 9,12 588,53 12 76 1,1 27,2 660,86 Superheated 2 56 0,77 19,69 631,53 Superheated3 70 1,1 28,4 646,4 1 3 55 0,77 19,9 627,85 14 70 1,1 485,6 377,25 0 4 55 0,77 508,7 336,23 05 47 1,1 521,9 314,69 Subcooled 5 38 0,77 533,7 291,52 Subcooled6 5 0,19 16,6 314,69 0,29445 6 25 0,35 81,1 291,52 0,09747
  • 7. ISAHP - PROTOTYPEThe prototype built at DIME – University ofGenoa is composed of:• Variable speed volumetric compressor (6 cm3)• Pulse modulated electronic expansion valve• Water condenser• Bare steel solar panel (evaporator) (1m2)The solar evaporator is made of a copper coil(din=8mm, dext=10mm, L=30m, A=0.75m2)welded on an steel plate in which the R600aflows.Patent n. 1371944 (22.03.2010) Fiera Rho Milano, 28/03/2012 7
  • 8. ISAHP – PST comparisonThe PSIPC system has been installed coupled with a traditional solar thermalsystem (PST) in order to cover the hot water and heating load of a dressing room.This design solution allow to compare the instant power and the thermal energygeneration of the two devices. Fiera Rho Milano, 28/03/2012 8
  • 9. COP- ISAHPISAHP winter instantaneous COP Winter Tevap=18°C,Tamb=9°C,mref=0.8g/s Summer ???? Tevap=25°C, Tamb=24°C, mref=2g/sISAHP summer instantaneous COP Average COP 6(winter) ÷8 (summer) Fiera Rho Milano, 28/03/2012 9
  • 10. USER LOAD COVERAGE- ISAHP Traditional solar panel PSIPCComparison between user load coverage of the ISAHP (new) and a thermal panel (Traditional solar panel) Annual average user load coverage (reference load = 4964 MJ/m2year ISAHP = 34% Traditional thermal collector = 13% Fiera Rho Milano, 28/03/2012 10
  • 11. PRIMARY ENERGY SAVING - ISAHPPrimary energy saving index as a function of the COP for four representative months – simulated data.Red Line – Compressor Limits of the operative condition of the PSIPC machine. Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 11
  • 12. CONCLUSION - ADVANTAGESMain advantages in comparison to traditionalsystem:• The PSIPC prototype has been realized using R134a components but charged with R600a as refrigerant fluid. Good adaptability has been found.• Higher solar panel efficiency (0.7-0.9 ); → the solar panel is kept at lower working temperature• Higher heat pump COP (6 ÷ 8.5); → higher evaporator working temperature• Lower solar panel cost → bare steel plate, no glass cover Fiera Rho Milano, 28/03/2012 12
  • 13. PSIPC – Water to water system Wcomp storage tank collectors 3 (4) 5 Tuser User: Public swimming pool Quser Qevap compressor Power: 150 kW HPE Qint Panel surface: 400m2 Tp Qcond Date: 2011-2012 Water loop Refrigerant loop Domestic water 2 1 Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 13
  • 14. PVT-SAHP User: Test rig Power: 220 Wp + Panel surface: 1,6 m2 Date: 2011-2012 Wc Tamb A Qlost compressor A Qevap Qc th) USER PVT panel T H Wel Condenser el) Expansion valveFiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 14
  • 15. Thanks for the attention University of Genoa, the research Group: L.A. Tagliafico - tgl@ditec.unige.it F. Scarpa - federico.scarpa@unige.it G. Tagliafico - giulio.tagliafico@unige.it C. Rossi - cecilia.rossi@unige.it F. Valsuani - federico.valsuani@unige.it 3TC Engineering Srl Via Adamoli, 401 16165 Genova Tel. 010.836.22.04 - Fax 010.836.10.94 e-mail: info@3tcsrl.it web: www.3tcsrl.itFiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 15