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Energies 2020, 13, 6256 18 of 19 rb re rp rs rt ROI ti the price of standard coal the electricity consumption of the system per MW heat pump the unit price of the recovery system using absorption heat pump the salary of each worker the heating price the rate of return on the initial investment the design indoor temperature the maximum value of the outlet water temperature of the heat pump the calculated outdoor temperature during the heating period the outdoor temperature the average outdoor temperature during the heating period the design supply water temperature of primary heating network the supply water temperature of primary heating network the design return water temperature of primary heating network the return water temperature of primary heating network the supply water temperature of secondary heating network the return water temperature of secondary heating network the return water temperature of primary heating network at point Y the lending ratio of the initial investment from the bank 1. Sun, F.; Fu, L.; Sun, J.; Zhang, S. A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps. Energy 2014, 69, 516–524. [CrossRef] 2. Chen, H.; Xiao, Y.; Xu, G.; Xu, J.; Yao, X.; Yang, Y. Energy-saving mechanism and parametric analysis of the high back-pressure heating process in a 300 MW coal-fired combined heat and power unit. Appl. Therm. Eng. 2019, 149, 829–840. [CrossRef] 3. Ministry of Housing and Urban Rural Development of the People’s Republic of China. Urban Construction Statistic Annual Report of China; China Planning Press: Beijing, China, 2018. (In Chinese) 4. Li, Y.; An, H.; Li, W.; Zhang, S.; Jia, X.; Fu, L. Thermodynamic, energy consumption and economic analyses of the novel cogeneration heating system based on condensed waste heat recovery. Energy Convers. Manag. 2018, 177, 671–681. [CrossRef] 5. Li, Y.; Fu, L.; Zhang, S.J.E. Technology application of district heating system with Co-generation based on absorption heat exchange. Energy 2015, 90, 663–670. [CrossRef] 6. Sun, F.; Fu, L.; Zhang, S.; Sun, J. New waste heat district heating system with combined heat and power based on absorption heat exchange cycle in China. Appl. Therm. Eng. 2012, 37, 136–144. [CrossRef] 7. Rattner, A.S.; Garimella, S. Energy harvesting, reuse and upgrade to reduce primary energy usage in the USA. Energy 2011, 36, 6172–6183. [CrossRef] 8. Li, Y.; Wang, W.; Ma, Y.; Li, W. Study of new cascade heating system with multi-heat sources based on exhausted steam waste heat utilization in power plant. Appl. Therm. Eng. 2018, 136, 475–483. [CrossRef] 9. Ma, L.; Ge, Z.; Zhang, F.; Wei, H.J.E. A novel super high back pressure cascade heating scheme with multiple large-scale turbine units. Energy 2020, 201, 117469. [CrossRef] 10. Li, W.; Li, Y. Configuration optimization of the novel cogeneration heating system with multi turbine units. Energy Convers. Manag. 2020, 221, 113140. [CrossRef] 11. Duan, J.Z.; Zheng, W.; Wang, X.D.; Hao, Y.Z. Technical and Economic Analysis of 150MW Turbine Unit about Two Reconstruction Modes for High Back Pressure Heating. Appl. Mech. Mater. 2013, 291–294, 1708–1713. [CrossRef] 12. Zhao, S.; Ge, Z.; He, J.; Wang, C.; Yang, Y.; Li, P. A novel mechanism for exhaust steam waste heat recovery in combined heat and power unit. Appl. Energy 2017, 204, 596–606. [CrossRef] 13. Rama Rao, A.; Dutta, B.K. Blade vibration triggered by low load and high back pressure. Eng. Fail. Anal. 2014, 46, 40–48. [CrossRef] t′ t′ hp o to to t′ po tpo t′ pi tpi tso tsi tYpi x Greek symbol ηp the pipe efficiency ηb the boiler efficiency ReferencesPDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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