XV EUROPEAN CONFERENCE MILANO 7th-8thJUNE 2013 CSGLatest Technology in Refrigeration and Air ConditioningUnder the Auspice...
Contents1. Background2. Existing method to decrease earth energy unbalance for HP3. New concept to decrease earth energy u...
1. Background: MotivationEnergy load balance for Earth???R134a system R744 systemQ1: The optimized air cooling load propor...
Heat recovery system2. Existing Method to decrease energy unbalanceTypical building in China(archives building)Basic desig...
with heatrecovery systemUnbalance degree is 30% Unbalance degree is 16%Q:1. 30%16%, 0??2. 90% 0????2. Existing Method t...
3. New concept to decrease energy unbalance------(CO2 gas cooler + ground HX)Air-cooledGas cooler
3. New concept to decrease energy unbalance------ Mathematic modeling( )2,isen 1totcompcm h hW η−=gg2 2 42 2 2 2tot1 1 1 1...
3. New concept to decrease energy unbalance-----Validation of modelingAmbientTemp.InletPres.InletTemp.OutletTemp.Mass Flow...
1) Comparison between different operation methods[Alternate or coupledoperation of gas cooler and GX]4. Performance and ec...
1) Comparison between different operation methods [Shanghai, China]Operation method (alternate operation)4. Performance an...
Investment X104 RMB Cooling system +BoilerAir source heat pumpR134aGround source heat pumpR744 Ground source heat pump wit...
4. Performance and economy analysis 2) Effect of indoor temperature on earth energy unbalance and investment cost
4. Performance and economy analysis 3) Effect of air cooling load proportion on earth energy unbalance, investment cost an...
4. Performance and economy analysis 4) Effect of climates on earth energy unbalance, investment cost and operation costCli...
4. Performance and economy analysis 5) Effect of ground heat exchanger depth on system investment costReason:The heat flux...
6) Comparison between R744 heat pump system and the existing R134a system4. Performance and economy analysisR744 heat pump...
1) Numerical model for CO2 heat pump with gas cooler and groundheat exchanger was developed.2) Trough adjusting the air co...
Thank you very much!
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Haitao Hu - NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY - POMPE DI CALORE CON ANIDRIDE CARBONICA

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  • Haitao Hu - NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY - POMPE DI CALORE CON ANIDRIDE CARBONICA

    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 MINISTERSPerformance and economy analysis of a R744 heatpump system with an ambient air-cooled gas coolerand a ground heat exchanger under differentclimatic conditionsHaitao HU, Ph.D.,Visiting researcher (Norwegain Universiyt of Science and Technology)Lecturer (Shanghai Jiao Tong University)
    2. 2. Contents1. Background2. Existing method to decrease earth energy unbalance for HP3. New concept to decrease earth energy unbalance using R744heat pump system4. Performance and economy analysis of R744 system5. Conclusions
    3. 3. 1. Background: MotivationEnergy load balance for Earth???R134a system R744 systemQ1: The optimized air cooling load proportion?Q2: The influences of different factors on system performance?Earth energy balance, Investment cost, operation cost, Operation condtion?Air cooling load=
    4. 4. Heat recovery system2. Existing Method to decrease energy unbalanceTypical building in China(archives building)Basic design parameter of the buildingParameters Values Parameters ValuesBuilding area 8000m2Indoor design temperature 20 oCNumber of floors 4 Indoor design humidity 50%Heat transfer coefficientof exterior walls0.46W/ m2K Heating load 238.0 kWHeat transfer coefficientof exterior windows1.18W/ m2K Cooling load 545.6 kW
    5. 5. with heatrecovery systemUnbalance degree is 30% Unbalance degree is 16%Q:1. 30%16%, 0??2. 90% 0????2. Existing Method to decrease energy unbalanceUnbalance of earth energy for GSHP:
    6. 6. 3. New concept to decrease energy unbalance------(CO2 gas cooler + ground HX)Air-cooledGas cooler
    7. 7. 3. New concept to decrease energy unbalance------ Mathematic modeling( )2,isen 1totcompcm h hW η−=gg2 2 42 2 2 2tot1 1 1 10.26 0.7952 0.2803 0.0414 0.0022P P P PP P P Pη       = − + − + − ÷  ÷  ÷  ÷       Compressor:S vol 1m V Nη ρ= × × ×gGas cooler:3/1PrRe⋅⋅= jNu428.04tl32lp1D )()(tan)(Re324.0 CNPPPFj jjjjθ=( ) −++⋅=∆ 112 2121012ρρσρρρfAAGPmcc0916.03796.1ch35.5t0e3tP21D )())((log)()(tanRe01915.0 C−−= NDDAAPFf fffθGround Heat exchanger:( ) ( )( ) ( )( ) ( )( )21cos sin1 1cos 1 sin11 cos sin1Ph h ZPZ h Z P h ZPP h h ZPβ βθ β ββ β −− + = − × −− − + + 
    8. 8. 3. New concept to decrease energy unbalance-----Validation of modelingAmbientTemp.InletPres.InletTemp.OutletTemp.Mass Flow ofR744Pressure Dropof R744Exp. heatcapacityPredictedheat capacityoC Bar oC oC kg/h Bar kW kW25 75 88 27 2641.54 0.03 171 18725 75 88 25.4 2565.98 0.028 171 16130 78.5 88 32 6046.27 0.12 342 36230 78.5 88 30.4 5704.51 0.11 342 33135 92 88 37 11184.38 0.3 570 58345 85 88 47 30857.14 237 395 37045 120 88 47 11074.29 50 240 25845 120 140 45.4 18120 38 335 319Deviation is Within 10%
    9. 9. 1) Comparison between different operation methods[Alternate or coupledoperation of gas cooler and GX]4. Performance and economy analysis of R744 system2) Effect of indoor temperature3) Effect of air cooling load proportion4) Effect of climates5) Effect of ground heat exchanger depth6) Comparison between R744 heat pump system and the existing R134a system
    10. 10. 1) Comparison between different operation methods [Shanghai, China]Operation method (alternate operation)4. Performance and economy analysisCoupled Operation of GC+GX:  GX cooling loadGJGX heating loadGJUnbalance GX Max.cooling loadkWGX Max. heating loadkWOperation cost(X104RMB)GX 3445.5 2430.6 29.5% 545.6 238.0 41.12GX+Gas cooler[Alternate operation]2430.6 2430.6 0 545.6 238.039.67GX+Gas cooler[Coupled operation] 2430.6 2430.6 0 212.8 238.038.69Decrease 60%
    11. 11. Investment X104 RMB Cooling system +BoilerAir source heat pumpR134aGround source heat pumpR744 Ground source heat pump with gas cooler [alternate operation]R744 Ground source heat pump with gas cooler [Coupled operation]Instrument  123.02 159.76 124.68 149.00 140.00Transformer device 14.54 11.56 7.057.50 7.1Installation 33.91 49.13 37.40 38.50 38.0Natural Gas 8.74 0 0 0 0Ground HX 0 0 134.40 134.40 58.63Total 183.21 219.25 316.23 330.20 260.43Decrease 18%4. Performance and economy analysis 1) Comparison between different operation methods [Shanghai, China]  GX cooling loadGJGX heating loadGJUnbalance GX Max. cooling loadkW GX Max. heating loadkWOperation cost(X104 RMB)GX 3445.5 2430.6 29.5% 545.6 238.0 41.12GX+Gas cooler[Alternate operation]2430.6 2430.6 0 545.6 238.039.67GX+Gas cooler[Coupled operation] 2430.6 2430.6 0 212.8 238.038.69Decrease 6%
    12. 12. 4. Performance and economy analysis 2) Effect of indoor temperature on earth energy unbalance and investment cost
    13. 13. 4. Performance and economy analysis 3) Effect of air cooling load proportion on earth energy unbalance, investment cost and operation costRecommended operation condition:20 oCAir cooling load proportion is 30%
    14. 14. 4. Performance and economy analysis 4) Effect of climates on earth energy unbalance, investment cost and operation costClimate System GX Max. cooling loadkW GX Max. heating loadkWShanghaiOriginal 545.6 238.0GX+GX 212.8 238.0GuangzhouOriginal554.4 221.2GX+GX27.4 221.2New DelhiOriginal 775.5 237.3GX+GX 154.0 237.3
    15. 15. 4. Performance and economy analysis 5) Effect of ground heat exchanger depth on system investment costReason:The heat flux per meter of heat exchanger decreases with the increasing depth.In a long heat exchanger, temp. difference between fluid and backfill in the lower partof GX decreases, resulting in less heat transferred from water to backfill for per meterof heat exchanger.
    16. 16. 6) Comparison between R744 heat pump system and the existing R134a system4. Performance and economy analysisR744 heat pump systemR134a heat pump systemShanghai:30%Guangzhou:90%0%0%Investment cost:Shanghai: Decrease 18%; Guangzhou: Decrease 14%Operation cost:Shanghai: Decrease 6%Guangzhou: unchangeable
    17. 17. 1) Numerical model for CO2 heat pump with gas cooler and groundheat exchanger was developed.2) Trough adjusting the air cooling load proportion, the unbalanceof earth energy can always be decreased to zero.3) By using air-cooled gas cooler, the investment cost and operationcost can be decreased.4) With the increase of tube depth of GX, the investment cost willbe increased.5. Conclusion
    18. 18. Thank you very much!

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