2013 Progress Report: Development of Cost-effective, Compact Electrical Ultrafine Particle (eUFP) Sizers and Wireless eUFP Sensor NetworkEPA Grant Number: R835132
Title: Development of Cost-effective, Compact Electrical Ultrafine Particle (eUFP) Sizers and Wireless eUFP Sensor Network
Investigators: Chen, Da-Ren , Lu, Chenyang
Institution: Washington University
Current Institution: Washington University , Virginia Commonwealth University
EPA Project Officer: Chung, Serena
Project Period: September 1, 2012 through August 31, 2015 (Extended to August 31, 2016)
Project Period Covered by this Report: September 1, 2012 through August 31,2013
Project Amount: $499,130
RFA: Developing the Next Generation of Air Quality Measurement Technology (2011) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Air
Specific objectives of this research project are (i) to develop a cost-effective, portable electrical ultrafine particle (eUFP) sizer, enabling the spatial and temporal monitoring of UFP size distribution in the ambient; (ii) to develop a cost-effective, pocket eUFP sizer for measuring the UFP exposure at the personal level; (iii) to develop a wireless mesh network using proposed portable sizers as the nodes, enabling to monitor the working status of deployed sizers and to acquire data being collected via internet; and (iv) to evaluate and validate proposed technologies in planned field testing.
A mini-plate electrical ultrafine particle classifier (mini-plate EAC) has been developed in Year 1 of this project. Detail experiments had been performed to calibrate the performance of mini-plate EAC. The result shows that the particle sizing resolution of the prototype can be continuously improved up to the aerosol-to-sheath flowrate ratio of 1:10. At the aerosol-to-sheath flowrate ratio of 12, the sizing resolution of mini-plate EAC is not significantly better than that at the 1:10 flowrate ratio. In addition, prototype mini-Faradcages have been constructed and their performance has been evaluated by comparing its readings with those measured by condensation particle counters (CPCs). In addition, a series of mini-cyclones having multiple inlets have been designed and experimentally investigated. The mini-cyclone with multiple inlets will be installed in the mini-plate sizers for removing particles of large diameters.
(1) Development of mini-plate differential mobility classifier and aerosol charger.
(2) Assembly of the first portable electrical ultrafine particle sizer (eUFP sizer).