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Energies 2020, 13, 6256 17 of 19 the differences in population, climate, industrialization level, and other aspects of different regions, the heat and electricity consumption in each region is also different. When the cogeneration unit is used to provide heat and electricity for a certain area, the population and industrialization level of the area should be considered comprehensively. In an area dominated by residential users, more consideration should be given to meet the heating demand. In this case, the electricity generation is usually higher than the electricity consumption of residents in the area, so the remaining electricity can be considered to upload to the power grid to meet the electricity demand of other regions. In an area dominated by industrial users, then the electricity demand usually exceeds the heating demand. The electricity generated by the cogeneration unit cannot meet the electricity demand in the region, so additional electricity needs to be obtained from the power grid. Therefore, it is necessary to reasonably allocate the proportion of heat and electricity according to the actual situation for each region. Author Contributions: Conceptualization, J.W. and W.L.; Methodology, J.W. and W.L.; Investigation, W.L., G.L. (Guangyao Liu), and W.S.; Resources, G.L. (Gen Li); Data curation, G.L. (Guangyao Liu); Writing—original draft preparation, W.L.; Writing—review and editing, J.W. and B.Q.; Supervision, J.W. and B.Q.; Project administration, B.Q.; Funding acquisition, J.W. All authors have read and agreed to the published version of the manuscript. Funding: This research is supported by the Innovative Scientific Program of CNNC. Acknowledgments: We gratefully acknowledge the financial support of this study from the Innovative Scientific Program of CNNC. Conflicts of Interest: The authors declare no conflict of interest. Nomenclature Bs COP IT I0 Ib Ibl Ie It Ii Ip Ipi Is i K1,K2 m n N Np Pd PX ,PY ,PZ Php (t) Pdi Qh Qm Qs Qwhp Qi Qh Qh,r the coal saving in electricity generation the coefficient of performance of the heat pump the income tax rate. the total income from the waste heat recovery system the income from coal saving in electricity generation the bank loan the cost of electricity consumption the income from increased heating quantity the initial investment the annual after-tax profit of the system the principal and the interest for each year the salary of the workers the loan interest rate per year the characteristic coefficients relevant to the building heating the number of the works for the system the payback period of the bank loan the number of days for a certain outdoor temperature during the heating period the days of the heating period the design power of heat pump the design power of the heat pump at points X, Y, and Z, respectively the actual operating load of the heat pump the increased heating load at the design heat pump power the heating load for a certain number of days the maximum heating load during the heating period the energy corresponding to the coal saving the recovered waste heat quantity during the heating period the increased heating quantity during the heating period the heating load coefficient the ratio between the minimum and maximum heating load during the heating periodPDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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