Fig. 7 shows also that the pressure increases from the initial evaporator pressure P_sa (T_e) = 871.6 Pa to the value of 7386.6 Pa which correspond to the condensation pressure P_sa (T_c). The pressure remains constant until the temperature inside the adsorber reaches it's maximal value, then it decreases to attaint the initial value of 871.6 Pa and remains constant during the adsorption process.