Analysis of a 1 kW organic Rankine cycle using a scroll expander for engine coolant and exhaust heat recovery
Yiji LU1(), Anthony Paul ROSKILLY1, Long JIANG2, Longfei CHEN3(), Xiaoli YU4
1. Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle NE1 7RU, UK 2. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China 3. School of Energy and Power Engineering, Beihang University, Beijing 100191, China 4. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
The development of engine waste heat recovery technologies attracts ever increasing interests due to the rising strict policy requirements and environmental concerns. This paper presented the study of engine coolant and exhaust heat recovery using organic Rankine cycle (ORC). Eight working fluids were selected to evaluate and compare the performance of the integrated waste heat recovery system. Rather than the conventional engine ORC system mainly focusing on the utilization of exhaust energy, this work proposed to fully use the engine coolant energy by changing the designed parameters of the ORC system. The case study selected a small engine as the heat source to drive the ORC system using a scroll expander for power production. The evaluation results suggest that under the engine rated condition, the solution to fully recover the engine coolant energy can achieve a higher power generation performance than that of the conventional engine ORC system. The results suggest that adding a recuperator to the ORC system can potentially improve the system performance when the working fluids are dry and the overall dumped heat demand of the system can be reduced by 12% under optimal conditions. When the ORC evaporating and condensing temperature are respectively set at 85°C and 30°C, the integrated engine waste heat recovery system can improve the overall system efficiency by 9.3% with R600, R600a or n-Pentane as the working fluid.
. [J]. Frontiers in Energy, 2017, 11(4): 527-534.
Yiji LU, Anthony Paul ROSKILLY, Long JIANG, Longfei CHEN, Xiaoli YU. Analysis of a 1 kW organic Rankine cycle using a scroll expander for engine coolant and exhaust heat recovery. Front. Energy, 2017, 11(4): 527-534.
Maximum evaporating temperature provided from coolantenergy/°C
85
Temperature of condenser, /°C
30
Tab.2
M/(g?mol−1)
Tc/K
Pc/MPa
Vapor Cp/(J?kg−1?K−1)
Latent heat L/(kJ?kg−1)
Boiling point/K
Type
GWP/a
ODP
AL /a
R245fa
134.05
427.20
3.64
980.90
177.08
288.4
Dry
1030
0
7.6
Toluene
92.14
591.75
4.13
1223.90
399.52
383.75
Dry
n.a
n.a
n.a
n-Pentane
72.15
469.15
3.36
1824.12
349.00
309.25
Dry
0.1
0
n.a
R134a
102.03
374.21
4.06
1211.51
155.42
247.05
Isentropic
1430
0
14
R152a
66.05
386.41
4.52
1456.02
249.67
249.15
Wet
124
0
1.4
R600
58.12
425.13
3.80
1965.59
336.82
272.65
Dry
20
0
0.018
R600a
58.12
409.81
3.63
1981.42
303.44
261.45
Dry
20
0
0.019
R124
136.48
395.43
3.62
908.70
132.97
261.1
Dry
609
0.022
5.8
Tab.3
Fig.3
Fig.4
Fig.5
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