material part number pt1700s by deerfield urethane the sweep flow circulates through the sweep region 133 and back through the actual condensing region 132 there the flow is in communication with the cold source via the heat exchanger 126 u2032 fig1 19 show states criteria and steps involved in the operation of the system of fig1 13 in fig1 a state diagram illustrates the four major states of the system quiescent 260 charging 261 regenerating 263 and condensing 262 a detection of high moisture content in the ambient air with a remaining water holding capacity of the desiccant subsystem 101 is a condition that will cause a transition 250 to the charge state 261 b detection of significant held water in the desiccant subsystem in conjunction with a sufficient source of low grade heat is a condition that will cause a transition 255 to the regen state 263 a detection of low moisture content in the ambient air or a low remaining water holding capacity of the desiccant subsystem is a condition that will cause a transition 251 to the quiescent state 260 a detection of insufficient low grade energy to efficiently release moisture from the desiccant subsystem will cause a transition 254 to the quiescent state 260 b detection of significant held water in the desiccant subsystem in conjunction with a sufficient source of low grade heat is a condition that will cause a transition 252 to the condense state 262 a detection of insufficient moisture in the main chamber 100 will cause a transition 253 to the regen state.