The mass transfer performance is limited by the unstable heat source temperature during the desorption process of a solar energy adsorption refrigeration cycle. However

the pressure regulation can be used as an effective compensation method for mass transfer enhancement. The expressions of desorption ratio(l) and desorption rate are given by building a theoretical model of constant temperature desorption. The effect of mass transfer enhancement through pressure swing was calculated. The theoretical results revealed the regularities that the desorption ratio(l) would increase with the decrease of the system pressure at different desorption temperatures. The results showed that there were the same effects on the improvement of desorption rate through reducing the pressure of the system of 10 kPa or increasing the heat source temperature of 6-8℃. In addition

a solar adsorption unit tube adsorption refrigeration platform with activated carbon-methanol as working pair was constructed. Experiments were carried out under different desorption temperatures and system pressures

and the theoretical results were verified by experiments. The results showed that when the system pressure decreased by 14 kPa

at the desorption temperature of 90℃

100℃ and 110℃

the desorption ratio(l) increased by 20.5%

15.1% and 12.1%

and the average desorption rate increased by 49.3%

44.6% and 37.1%

respectively. The experimental results are in good agreement with the theoretical calculation. The coupling relationship between the temperature and pressure on desorption performance was obtained. Finally

the method of lowering pressure for enhanced desorption is proposed in a practical application of solar adsorption refrigeration system.