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Energies 2020, 13, 6256 12 of 19 4.1. Optimization of the Design Power of the Heat Pump EnergFieisg2u0r2e0s, 183,axnFdO9R sPhEoEwR RIEVaInEWd ROI at different design powers of the heat pump. It can be seen1f3romf 21 p Figures 8 and 9, when the design power of the heat pump are 101.0 and 80.0 MW, Ip and ROI reach the maximum value, respectively. The optimal design power of the heat pump for this unit is 101.0 or Energies 2020, 13, x FOR PEER REVIEW 4 13 of 21 80.0MW,accordingtodifferenteconomicindices.ThemaximumvalueofIpis828.1×10 RMB,while the maximum value of ROI is 41.1%. Figure 8. I p at different design powers of the heat pump. Figure 8. Ip at different design powers of the heat pump. Figure 8. I p at different design powers of the heat pump. Figure 9. ROI at different design powers of the heat pump. Figure 9. ROI at different design powers of the heat pump. Although the maximum value of ROI appears when the design power of the heat pump is 140.12..0EMcoWno,mthiceAdneaclryesmiseonftWinasRteOHIeiastsRmecaolvlewryheSnystheme dUesiinggnApbosworeprtiiosniHnetahtePruamngpe of 50 to 101.0 MW. Figure 9. ROI at different design powers of the heat pump. If only focusing on ROI, the smaller design power of the heat pump is also appropriate. According to the economic model in Section 3, the unit price of the heat pump recovery system and the prices of the standard coal, the heating, and the electricity will all impact the economy of the 4.42..2E.EcocnonomomicicAAnnalaylsyisisofoWfWasatseteHHeaetatRReceocvoevreyrySySsytsetmemUUsisnigngAAbsbosroprtpiotinonHHeaetaPtuPmumpp waste heat recovery system. The economy of the system also varies with the changes in these AAccocrodrdinigngtotothteheceocnoonmomicicmmododeleilninSeScetcitoinon3,3t,hteheuunintiptprircieceofotfhtehehehaetaptupmumpprerceocvoevreyrysyssytsetmem influencing factors in market value. ananddththeepprirciceessooffttheesttandardcoal, theheating,,andththeeeelelecctrtirciictiytywwilillallallilmimpapcatctthteheceocnonmoymoyfothfe thweawstaestheehatearterceocvoevreyrysyssytsetmem. T.hTeheceocnoonmomyyofofththeessyysstteemallsovarieswithtthecchhaannggeessininthtehseese 4.2.1. Effect of Unit Price of the Recovery System iniflnfuleunecnicnigngfafcatcotrosrsininmmarakrektevtavlauleu.e. The effect of the unit price of the recovery system using an absorption heat pump on the economy of the system is presented in Figures 10 and 11, including two optimal design powers of 4.2.1. Effect of Unit Price of the Recovery System 4.2.1. Effect of Unit Price of the Recovery System the heat pump. The figures show that the unit price of the recovery system using an absorption heat The effect of the unit price of the recovery system using an absorption heat pump on the economy The effect of the unit price of the recovery system using an absorption heat pump on the pump substantially affects the economics of the system. of the system is presented in Figures 10 and 11, including two optimal design powers of the heat economy of the system is presented in Figures 14 0 and 11, in4 cluding two optimal design powers of When the unit price changes from 10 × 10 to 40 × 10 RMB/MW, the annual after-tax profit the heat pump. The figu4 res show th4 at the unit price of the recovery system using an absorption hea4t decreasesfrom910×10 to652×10 RMBinthecaseofa101.0MWdesignpowerandfrom727×10 pump subs4 tantially affects the economics of the system. to 518 × 10 RMB in the case of an 80.0 MW design power. Compared with the current design price, When the unit price changes from 10 × 104 to 40 × 104 RMB/MW, the annual after-tax profit the relative variation ranges are from +10.6% to −27.0% and from +10.6% to −21.2%. For the rate of decreases from 910 × 104 to 652 × 104 RMB in the case of a 101.0 MW design power and from 727 × 104 return on initial investment, it is very close to each other for the two optimal design powers and to 518 × 104 RMB in the case of an 80.0 MW design power. Compared with the current design price, changes from 90% to 20%, and the relative variation range is from +121.2% to −60.6%. the relative variation ranges are from +10.6% to −27.0% and from +10.6% to −21.2%. For the rate ofPDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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