Heating a room requires 42 MJ of heat per hour. How many hours can you heat a room with

Heating a room requires 42 MJ of heat per hour. How many hours can you heat a room with the heat released during the cooling of 2 m3 of water from 80 degrees to 30 degrees?

These tasks: Q1 (the amount of heat required to heat the room for 1 hour) = 42 MJ (42 * 10 ^ 6 J); V (water volume) = 2 m3; t1 (initial temperature of taken water) = 80 ºС; t2 (end temperature) = 30 ºС.

Reference values: Sv (specific heat capacity of water) = 4200 J / (kg * K); ρ (water density) = 1000 kg / m3.

The duration of heating the room can be determined by the formula: n = Q2 / Q1 = Cw * ρ * V * (t1 – t2) / Q1.

Let’s calculate: n = 4200 * 1000 * 2 * (80 – 30) / (4.2 * 10 ^ 6) = 100 hours.