Abstract: Some operation modes of the porous plate water sublimator used in an EVA space suit thermal control system are discussed. Parameters that affect sublimation mode and cyclic mode are studied. Based on some assumptions of porous plate structure, relevant mathematics models are established,which can be used to predict the operation mode of the sublimator and surface temperature of the heat exchanger.

Key words: water sublimator, porous plate, operation mode, EVA space suit