If the LHV of wood logs is 16 MJ/kg, how much energy is available for 2 kg of wood logs? If I burn all wood logs, what is the maximum energy in the heat I could obtain? If 30% of heat can be changed to electricity, how much electricity will be generated? If the heating value (LHV) of dry wood is 20 MJ/kg, what is the maximum energy 20 tonnes of wood could provide? If 60 % of the heat in wood could be transferred, how much heat can be transferred? If the heating value of coal is 40 MJ/kg, how much energy is available for 10 tonnes of coal? If I burn wood logs (LHV =16 MJ) to obtain the same amount of heat, how much (in tonne) of wood logs do I need to burn?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.78P: What are the important modes of heat transfer for a person sitting quietly in a room? What if the...
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If the LHV of wood logs is 16 MJ/kg, how much energy is available for 2 kg of wood logs? If I burn all wood logs, what is the maximum energy in the heat I could obtain? If 30% of heat can be changed to electricity, how much electricity will be generated?

If the heating value (LHV) of dry wood is 20 MJ/kg, what is the maximum energy 20 tonnes of wood could provide? If 60 % of the heat in wood could be transferred, how much heat can be transferred?

If the heating value of coal is 40 MJ/kg, how much energy is available for 10 tonnes of coal? If I burn wood logs (LHV =16 MJ) to obtain the same amount of heat, how much (in tonne) of wood logs do I need to burn?

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