Energy from Waste: Reuse of Compost Heat as a Source of Renewable Energy

Table 2

Nomenclature.

Parametera	Description	Unit
𝑇,𝑖	Temperature of the fluid entering the system	K
𝑇,𝑜	Temperature of the fluid leaving the system	K
𝑚^•	Mass flow rate of the fluid	kg s^-1
𝑐𝑝	Specific heat capacity of the fluid at constant pressure	kJ kg^-1K^-1
𝑑𝑖	Inner diameter of the heat exchanger pipe	m
𝑑𝑜	Outer diameter of the heat exchanger pipe	m
𝑘𝑤	Thermal conductivity value of the pipe wall material	W m^-1K^-1
ℎAIR	Heat transfer coefficient of air	W m^-2K^-1
ℎWATER	Heat transfer coefficient of water	W m^-2K^-1
𝐴	Surface area of the heat exchanger wall	m^2

aThe subscript ℎ refers to the initially hotter fluid, and the subscript 𝑐 refers to the initially colder fluid.