def Qij(Ti, Tj, Rij):
    """ Heat transferred from node i to node j

	Parameters
	----------	
	Ti : float or (m x n) np.array
		temperature of node i [°C] or [K]

	Tj : float or (m x n) np.array
		temperature of node j [°C] or [K]
		
	Rij : float or (m x n) np.array
		heat transfer resistance between nodes [K/W]

	Returns
	-------
	Q : float or (m x n) np.array
		heat transferred between nodes
	
	Example use
	-----------
	>>> XXX		 
	"""
    return (Ti - Tj) / Rij
