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H2) in gasifier, and then the produced gas (fuel) is cleaned and is burned in an IC engine. Waste heat of the system can be used for district heating. Both systems can produce heat and power; however they differ in some aspects as here bellow. (Definition of gasification is mentioned in Appendix, section A ‐2). Figure 5: Combined heat and power production using gasification and internal combustion engines Source: Energy Conversion and Management 20099 First, electricity to heat ratio in gasification and IC engines is more than double in comparison with CHP plant using ORC in combination with Biomass combustion. Gasification based system needs about 30 ‐ 40% more biomass to achieve rather same heat production. Secondly, since gasification deals with higher temperatures, more losses occur in heat transfer system, hence, more nominal power is expected to compensate losses and give the same heat output. To clarify this, forward heating pipe in gasification type is about 120 °C and in ORC type is 90°C. All above mentioned issues will give a little more total efficiency for combined heat and power cycles using ORC rather than gasification (A.Rentizelas, S. Karellas, E.Kakaras, I.Tatsiopoulos, 2009), however, better electrical efficiency in gasification based case will make the industry owners to select the technology based upon their electricity or heat demand.9 14

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