Heat pumps can be used as a practical way of heating buildings. The ground itself can be used as the cold source because at a depth of a few metres the temperature is independent of the air temperature; in temperate latitudes the ground temperature is around 13 °C at a depth of 10 m. On a cold day it is found that to keep a certain room at 18 °C a heater rated at 5 kW is required. Assuming that an ideal heat pump is used, and that all heat transfers are reversible, calculate the power needed to maintain the room temperature. Recall that 1 W = 1 J s−1.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Heat pumps can be used as a practical way of heating buildings. The ground itself can be used as the cold source because at a depth of a few metres the temperature is independent of the air temperature; in temperate latitudes the ground temperature is around 13 °C at a depth of 10 m. On a cold day it is found that to keep a certain room at 18 °C a heater rated at 5 kW is required. Assuming that an ideal heat pump is used, and that all
Trending now
This is a popular solution!
Step by step
Solved in 5 steps
