The hot and cold inlet temperatures to a concentric tube heat exchanger are \(T_{h, i}=200^{\circ} \mathrm{C}, T_{c, i}=100^{\circ} \mathrm{C}\), respectively. The outlet temperatures are \(T_{h, o}=120^{\circ} \mathrm{C}\) and \(T_{c, o}=125^{\circ} \mathrm{C}\). Is the heat exchanger operating in a parallel flow or in a counterflow configuration? What is the heat exchanger effectiveness? What is the NTU? Phase change does not occur in either fluid.