title: Determination of the Clean Air Delivery Rate (CADR) of Photocatalytic Oxidation (PCO) Purifiers for Indoor Air Pollutants Using a Closed-Loop Reactor. Part II: Experimental Results.
abstract: The performances of a laboratory PhotoCatalytic Oxidation (PCO) device were determined using a recirculation closed-loop pilot reactor. The closed-loop system was modeled by associating equations related to two ideal reactors: a perfectly mixed reservoir with a volume of VR= 0.42 m³ and a plug flow system corresponding to the PCO device with a volume of VP= 5.6 × 10-3m³. The PCO device was composed of a pleated photocatalytic filter (1100 cm²) and two 18-W UVA fluorescent tubes. The Clean Air Delivery Rate (CADR) of the apparatus was measured under different operating conditions. The influence of three operating parameters was investigated: (i) light irradiance I from 0.10 to 2.0 mW·cm-2; (ii) air velocity v from 0.2 to 1.9 m·s-1; and (iii) initial toluene concentration C₀ (200, 600, 1000 and 4700 ppbv). The results showed that the conditions needed to apply a first-order decay model to the experimental data (described in Part I) were fulfilled. The CADR values, ranging from 0.35 to 3.95 m³·h-1, were mainly dependent on the light irradiance intensity. A square root influence of the light irradiance was observed. Although the CADR of the PCO device inserted in the closed-loop reactor did not theoretically depend on the flow rate (see Part I), the experimental results did not enable the confirmation of this prediction. The initial concentration was also a parameter influencing the CADR, as well as the toluene degradation rate. The maximum degradation rate rmaxranged from 342 to 4894 ppbv/h. Finally, this study evidenced that a recirculation closed-loop pilot could be used to develop a reliable standard test method to assess the effectiveness of PCO devices.
authors.affiliation: UMR CNRS 6144 GEPEA, IMT Atlantique, La Chantrerie, 4 rue Alfred Kastler, CS 20722, 44307 Nantes CEDEX 3, France. valerie.hequet@imt-atlantique.fr.
authors.forename: Valérie
authors.initials: V
authors.lastname: Héquet
authors.affiliation: UMR CNRS 6144 GEPEA, IMT Atlantique, La Chantrerie, 4 rue Alfred Kastler, CS 20722, 44307 Nantes CEDEX 3, France. frederic.batault@mines-nantes.fr.|IMT Lille-Douai, Université de Lille, SAGE, F-59000 Lille, France. frederic.batault@mines-nantes.fr.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Batault
authors.affiliation: UMR CNRS 6144 GEPEA, IMT Atlantique, La Chantrerie, 4 rue Alfred Kastler, CS 20722, 44307 Nantes CEDEX 3, France. cecile.raillard@univ-nantes.fr.
authors.forename: Cécile
authors.initials: C
authors.lastname: Raillard
authors.affiliation: IMT Lille-Douai, Université de Lille, SAGE, F-59000 Lille, France. frederic.thevenet@imt-lille-douai.fr.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Thévenet
authors.affiliation: UMR CNRS 6144 GEPEA, IMT Atlantique, La Chantrerie, 4 rue Alfred Kastler, CS 20722, 44307 Nantes CEDEX 3, France. laurence.le-coq@imt-atlantique.fr.
authors.forename: Laurence
authors.initials: L
authors.lastname: Le Coq
authors.affiliation: UMR CNRS 6144 GEPEA, IMT Atlantique, La Chantrerie, 4 rue Alfred Kastler, CS 20722, 44307 Nantes CEDEX 3, France. eric.dumont@imt-atlantique.fr.
authors.forename: Éric
authors.initials: É
authors.lastname: Dumont
mesh_terms: D061808:Air Filters / Q000592:standards; D016902:Air Pollution, Indoor / Q000032:analysis*; D000465:Algorithms; D002384:Catalysis; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010777:Photochemistry / Q000379:methods*; D055549:Volatile Organic Compounds
chemical_list: D055549:Volatile Organic Compounds
keywords: Clean Air Delivery Rate (CADR); Volatile Organic Compounds (VOCs); air cleaner; indoor air quality; photocatalysis