Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

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Engineering Thermodynamics
Producer gas is obtained by

Carbonization of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 650°C
Passing steam over incandescent coke

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