# How much wood does it take to burn a brick stove? The efficiency of the furnace is 25%, the weight of the furnace is 1.5 tons

How much wood does it take to burn a brick stove? The efficiency of the furnace is 25%, the weight of the furnace is 1.5 tons; during the heating process, the furnace temperature changes from 10 ° C to 70 ° C.

To determine the mass of firewood needed, we use the formula: η = CK * mp * (t2 – t1) / (qd * md), whence we express: md = Ck * mp * (t2 – t1) / (qd * η).

Constants and variables: Ck – beats. the heat capacity of the brick (CK = 880 J / (kg * K)); mp is the mass of the furnace (mp = 1.5 t = 1.5 * 10 ^ 3 kg); t2 – end. pace. ovens (t2 = 70 ºС); t1 – early. pace. (t1 = 10 ºС); qд – beats. heat of combustion of firewood (qd = 1 * 10 ^ 7 J / kg); η – furnace efficiency (η = 25% = 0.25).

Calculation: md = 880 * 1.5 * 10 ^ 3 * (70 – 10) / (1 * 10 ^ 7 * 0.25) = 31.68 kg.

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