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In a high efficiency furnace, natural gas (methane, 10%) enters at 25C and 100 kPa. The natural gas is burned with 60% theoretical excess air

In a high efficiency furnace, natural gas (methane, 10%) enters at 25C and 100 kPa. The natural gas is burned with 60% theoretical excess air also entering at 25C and 100 kPa. The gaseous products of combustion exit the furnace at 40C and 100 kPa. What is the heat transfer for this process?

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