For alloy design of hydrogen permeable membrane, it is important to control pressure-composition-isotherm (PCT curve) in an appropriate manner in order to obtain high hydrogen permeability with strong resistance to hydrogen embrittlement. Based on this concept, V-based alloy membranes are designed under some given pressure conditions at a temperature in view of the partial molar enthalpy change, Delta(H) over bar (0.2), and entropy change, Delta(S) over bar (0.2), of hydrogen for hydrogen dissolution. It is demonstrated that the PCT curve can be controlled very precisely in view of Delta(H) over bar (0.2) and Delta(S) over bar (0.2). Also, the required membrane area to obtain 300 Nm(3) h(-1) of hydrogen flow is estimated. It is found that, in view of the membrane area, it is favorable to apply at least 400 kPa of hydrogen pressure at feed side. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.