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Table 5.3: Costing values and equations for the various parts in the system ($/h) 0.008271 0.01801 0.01034 0.008271 0.002247 Component Boiler Expander Regenerator Condenser Pump ICC ($) 1200 1000 1500 1200 300 OM% (% of ICC) 15 25 15 15 25 OM ($) OMb = OM%b · ICCb OMexp = ICCexp · OM% OMregen = OM% regen · ICC regen OM =OM% ·ICC cond cond cond OMp = OM%p · ICCp TCC ($/y) 72.45 65.63 90.56 72.45 19.69 The percentages for operating and maintenance costs are taken from Nafey et al., (2010). The costs for the components are sourced from various vendors. The current experimental system is built using a combination of donated parts, used parts and new parts. It is difficult to truly find actual costs for these parts as the expander is a compressor which is converted for this use. A good estimate on the cost of the compressor and the cost to convert it is estimated in the table above. This cost takes into the account of the size of the current expander. Capital and operating costs for a solar field are not taken into account as this was not the scope for the project. The analysis is designed so that this system can potentially be used with any “low temperature” heat source. This assumption is made for the initial optimization. Subsequent optimizations for electricity cost rate will introduce an exergy price on the heat input to the boiler. The cost rate balances for each of the components are done to complete the exergoeconomic analysis. The cost of the pump and condenser are added to the total capital and operating rate for the expander since the exergy stream in these components have negligible value. The cost rate for the exergy leaving the expander is assumed to have 50% 54PDF Image | Exergoeconomic Analysis and Optimization of ORC
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