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Biomass Based Small Scale Combined Heat and Power Tech

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Biomass Based Small Scale Combined Heat and Power Tech ( biomass-based-small-scale-combined-heat-and-power-tech )

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Table 5.1 Heat Load in Harads, [50] Facilities Harads församlingshem Harads kyrka Harads skola och badhus Vårdcentral (inkluderar Älvstrand) Edestrand Edeforsvägen 16 Radhusvägen (46-70 jämna) Utsiktsvägen Edeforsvägen 35 Brandstation Svanövägen (20 hus) Sum Power [kW] 37 50 327 400 172 67 92 57 42 30 220 1 494 Annual energy [MWhth] 89 119 785 700 370 161 222 136 100 75 528 3 285 Plant As previously mentioned the plans for Harads is to build a district heat plant supplying the community with heat. The question that is asked is if it would be more profitable to install a CHP plant instead. The technologies that could be considered at present development stage are the steam engine, gas engine or ORC. However the relative low thermal power needed and the fact that the main prerequisite except for being economically viable are that the plant works sufficient at partial load, which frequently occurs when operated in heat controlled mode. In addition the considered fuel quality is not uniform. Considering this only steam engine or an ORC is optional. But as the ORC has been proven commercial and has a lower COE it was chosen. Turboden S.r.l was the chosen manufacture of the ORC module (see Chapter 2.1.1.) The plant performance data is listed in Table 5.2 Table 5.2 Plant performance data Harads plant, [16] Pel Pth Pfuel Electric efficiency Thermal efficiency Annual operation hours [kWel] 450 [kWth] 2025 [kWth] 3191 [%] 14 [%] 78 [h] 5000 Economic Evaluation Investment data for the plant are listed in Table 5.3, were costs for construction was taken from Goldschmidt [15]. The total investment was split up on an electricity and heat generating part, allowing calculations of the COE and COH separately. 55

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