Application of Oil Flooded Compression with Regeneration to a - PowerPoint PPT Presentation

Application of Oil Flooded Compression with Regeneration to a Packaged Heat Pump System RAs: Bin YANG, Timothy BLATCHLEY, Christian BACH PIs: Jim E. BRAUN, Travis HORTON, Eckhard GROLL

Outline  Introduction  Experiment  Results and Discussion  Conclusions 10/20/2015 2

Introduction Figure 1: Energy consumption in Figure 2: System performance of the air source heat pump at different ambient temperatures residential sectors in U.S. ( Ramaraj, 2012 ) ( http://www.eia.gov/consumption/resident ial/index.cfm ) 10/20/2015 3

Introduction (Bell, 2011) Figure 4: Schematic of the typical heat pump system using oil flooded compression with regeneration technology 10/20/2015 4

Introduction Table 1: Research on the oil flooded compression technology at Herrick Labs  Studied on the effect of liquid flooding in the Ericsson cycle; Hugenroth et al. (2006)  Experimentally investigated the oil flooding effect on a heat pump system performance.  Developed a detailed scroll compressor model with oil flooded technology; Bell et al. (2011, 2012)  Investigated the effect of oil flooded compression technology combined with regeneration on an air source heat pump.  Experimentally tested an oil flooded compressor Ramaraj (2012) prototype. 10/20/2015 5

Experiment Figure 4: Schematic of the packaged heat pump system using oil flooded compression with regeneration technology 10/20/2015 6

Experiment (a) Overview (b) Oil flooded compressor prototype Figure 5: Experimental setup 10/20/2015 7

Experiment Table 2: Test matrix for oil flooded system Test Indoor Unit [ºF ] Outdoor Unit [ºF ] Indoor Air Flow rate Name EDB EWB EDB EWB [CFM] H1 47 43 H2 17 15 1750 70 <=60 H3* 0 minimum 10/20/2015 8

Results and Discussion 10 4 Capacity improvement [%] 2 8 COP improvement [%] 0 6 -2 -4 4 47F(8.33C), 25SH 47F(8.33C), 25SH 47F(8.33C), 25SH 47F(8.33C), 25SH 47F(8.33C), 50SH 47F(8.33C), 50SH 47F(8.33C), 50SH 47F(8.33C), 50SH -6 17F(-8.33C), 40SH 17F(-8.33C), 40SH 17F(-8.33C), 40SH 17F(-8.33C), 40SH 2 5F(-15C), 50SH 5F(-15C), 50SH 5F(-15C), 50SH 5F(-15C), 50SH -8 0 -10 5 10 15 20 25 30 35 40 5 10 15 20 25 30 35 40 Oil mass fraction [%] Oil mass fraction [%] Figure 6: COP improvement for oil flooded system Figure 7: Heating capacity improvement for oil combined with regeneration technology flooded system combined with regeneration technology 10/20/2015 9

Results and Discussion 10 35 2 Heating load for application 1 Heating load for application 1 Seasonal efficiency Seasonal efficiency Seasonal efficiency [Btu/(W-h)] Seasonal COP Seasonal COP 30 Heating load for application 2 Heating load for application 2 8 1.8 Heating capacity of oil flooded system Heating capacity of oil flooded system Heating rate [kW] 25 Heating capacity of single stage system Heating capacity of single stage system Seasonal COP [-] 6 1.6 20 15 4 1.4 10 2 1.2 5 0 0 1 Baseline system Oil flooded system -30 -20 -10 0 10 20 Ambient temperature [C] Seasonal efficiency in heating Figure 8: Heating seasonal efficiency and Figure 9: Heating load and heat capacity COP improvement of oil flooded system for different ambient temperatures 10/20/2015 10

Results and Discussion 4 4 Oil flooding system COP for application 2 Oil flooding system COP for application 2 Oil flooding system COP for application 1 Oil flooding system COP for application 1 Single stage COP Single stage COP Single stage COP Single stage COP 3 3 HPBP HPBP System COP [-] System COP [-] 2 2 1 1 0 0 -3.43 -3.43 -30 -20 -10 0 10 -30 -20 -10 0 10 Ambient temperature [C] Ambient temperature [C] (a) Application 1 (b) Application 2 Figure 10: Oil flooded system COP at different ambient temperatures for application 1 and 2 10/20/2015 11

Conclusions  The tested prototype system demonstrates promising application of the oil flooded compression combined with regeneration technology into the low ambient heat pump;  One circuit of the indoor coil was used as the oil cooler, leading to a smaller condenser heating transfer area and potential maldistribution inside the indoor coil;  A new oil flooded system using a new prototype compressor and oil cooler will be tested soon at Herrick Labs. 10/20/2015 12