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Daily operation of a solar powered simple effect one stage water - lithium bromide absorption cooling system is analyzed. The whole system is composed by a parabolic trough collector concentrating solar energy into a tubular receiver, a fully mixed thermal water storage tank and the absorption cooling system. Water is solar heated and stored to be used for maintaining the cooling system in operation as long as possible during the considered day. Time dependent cooling load is considered for the air conditioning of a residential two-storeys house. The aim is to correctly size the solar collector and storage tank and thus a parametric study is performed in this regard. The results emphasized high operation instability of the cooling system due to the large interval of variation for desorber temperature. Optimum dimensions of the storage tank associated to a specific solar collector dimension are determined to ensure the longest continuous startup operation of the cooling system. [ABSTRACT FROM AUTHOR]