1. Bin Yang TSRA Seminar 2013/11/15
Application of oil flooded compression with regeneration to a packaged heat pump system
Bin Yang
TSRA Seminar
2013/11/15

2. Outline Oil flooded compression system
SPP(Small Packaged Product) unit test
Preliminary study on secondary loop using oil flooded compression with regeneration technology
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3. Oil flooded compression system
Oil flooded compressor test (Sugi’s work)
Definition of overall isentropic efficiency
Determination of oil specific heat capacity
Compressor map
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4. Oil flooded compression system
By courtesy of Ian Bell(2011)
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5. Oil flooded compressor test
By courtesy of Sugi (2012)
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6. Oil flooded compressor test
(From Sugi’s thesis, 2012)
Condensing temperature: 43.3 ℃
Injected oil temperature: ℃
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7. Definition of overall isentropic efficiency
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8. Definition of overall isentropic efficiency
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9. Determination of oil specific heat capacity
Use a constant specific heat capacity
POE oil, C_p = 2.30 kJ/kg-K as recommended by Totten (2003)
Problem:
Use a variable specific heat capacity
Specific heat capacity changes with temperature
Conde (1996), Lee and Kesler (1976)
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10. Determination of oil specific heat capacity
Method:
Combine the model from Conde (1996) and Lee-Kesler (1976).
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11. Constant vs. variable specific heat capacity
Constant oil specific heat
Variable oil specific heat
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12. Summary of overall isentropic efficiency
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13. Compressor map xL -- oil mass fraction; Rho_x: density, kg/m^3
T_oil,1 – injection oil temperature, K; T_gas,1 – suction gas temperature, K;
T_2m – discharge temperature, K; T_C -- critical temperature, K;
P_1,2 -- suction/discharge pressure, kPa;
m_dot -- mass flow rate, kg/s; W_dot -- compressor power, W.
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14. Compressor map C1 = 0.9469 C8 = 0.02698 C15 = -5.185 C2 = 1.053
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15. Compressor map
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16. Compressor map
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17. Compressor map
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18. Compressor map
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19. SPP (Small Packaged Product) test
SPP unit test system
Test matrix
Test results
New SPP unit test on the agenda
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20. SPP unit test system
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21. SPP unit test system
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22. Test matrix Legend: * : Test not specified in AHRI210/240
Test Base
Name
Indoor Unit (ºF)
Outdoor Unit (ºF)
Indoor Air (CFM)
EDB
EWB H1 70
<=60 47 43
1750 H2 35 33 H3 17 15
H4*
min
Legend:
* : Test not specified in AHRI210/240
**: For every test in heating mode, vary the oil mass fraction from 0.0 to 0.30, running at
0.0/0.05/0.10/0.15/0.20/0.30..
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23. Test results
System COP
Heating capacity
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24. New oil flooded compressor
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25. Preliminary study on the secondary loop using oil flooded compression with regeneration technology
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26. Secondary loop using oil flooded compression
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27. Use the R410A compressor map
(a) Operating condition in the propane compressor map
(b) Operating condition out of the propane compressor map
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28. Flow chart of the cycle model
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29. System performance
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30. Thank you!
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