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water/gas heat exchanger that produces district heat water at a temperature of 90°C, [31]. The process is shown in Figure 2.13 Figure 2.13 Process description of the BG100 biomass generator System Performance No experimental performance tests have been identified. However according to Tatt [30] the unit is able to achieve a total efficiency exceeding 80% and an electrical efficiency over 20%. The plant is also capable to run in fully automatic continuous operation 8000 hours annually. Economic Evaluation Some changes had to be done to the economic calculation of Chapter 1.3 to make them valid for a plant of this size. As mentioned before no system performance test has been identified, therefore some of the values had to be assumed. The thermal output was chosen to 225 kWth (midway between 200 and 250kWth, which was the specified nominal thermal output). Furthermore the fuel input was assumed to 400 kWth, resulting in a total efficiency of 81% which fit the stated value of “above 80” well. The initial investment of the module amounts to 600000 € along with an annual cost of 15000 € for service, [30]. The specific investment for a theoretical heat part was taken from Kjellström [7] and amounts to 444 €/kWth. Because of the small plant size, the fuel assumed to be used was pellets. The price was taken from Table 1.2 for Briquettes & Pellets and amounts to 23.4 €/MWh. The important values are summarized in Table 2.11. 31PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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