Abstract: A reservoir for a redox flow battery comprising: at least one inner tank for electrolyte, the or each inner tank having at least one inner tank wall, an outer, bund tank around the or each inner tank, air circulation gaps or passages between the inner and outer walls or the inner and outer tanks and means for passing cooling air to the air circulation gaps or passages for cooling the electrolyte in or each inner tank.

Abstract: A dust separator/collector assembly for a vacuum cleaner, comprising a housing, a first cyclone having an inlet and outlet for suction airflow, and an outlet for separated dust, a plurality of second cyclones, having respective inlets arranged to receive air from the outlet of the first cyclone, and further having respective air outlets and outlets for separated further dust, wherein the first cyclone is disposed in a lower region of the housing and the second cyclones are disposed in an upper region of the housing and wherein the first cyclone comprises a generally cylindrical cyclone body having a tangential inlet duct for suction airflow at a lower part of the cyclone body, and an upwardly extending outlet for suction airflow leading to the inlets of the second cyclone.

Abstract: A reservoir for a redox flow battery comprising: at least one inner tank for electrolyte, the or each inner tank having at least one inner tank wall, an outer, bund tank around the or each inner tank, air circulation gaps or passages between the inner and outer walls or the inner and outer tanks and means for passing cooling air to the air circulation gaps or passages for cooling the electrolyte in or each inner tank.

Abstract: A dust separator/collector assembly for a vacuum cleaner, comprising a housing, a first cyclone having an inlet and outlet for suction airflow, and an outlet for separated dust, a plurality of second cyclones, having respective inlets arranged to receive air from the outlet of the first cyclone, and further having respective air outlets and outlets for separated further dust, wherein the first cyclone is disposed in a lower region of the housing and the second cyclones are disposed in an upper region of the housing and wherein the first cyclone comprises a generally cylindrical cyclone body having a tangential inlet duct for suction airflow at a lower part of the cyclone body, and an upwardly extending outlet for suction airflow leading to the inlets of the second cyclone.