Heat capacity – The relationship between the heat supplied to a body and the temperature rise resulting thereof is called the heat capacity C of the body:
C = d Q / d T
The unit of the heat capacity is J/K.
The specific heat capacity c [J/m*K; J/m²*K; J/kg*K; …], often abbreviated to specific heat or also inaccurately referred to as heat capacity, is a thermodynamic chemical property. It measures the capacity of a material to store thermal energy.
To design a heat exchanger, the specific heat capacities both of the medium to be tempered and the tempering medium is of decisive importance as this allows, amongst others, to calculate the corresponding volume flows.