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US EPA update the approved version of CALPUFF to V5.8.5

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new epa calpuff version   The USEPA approved in July 2016 an update of CALMET and CALPUFF from V5.8.4 to V5.8.5. This update includes code changes described in Model Change Bulletin H and include fixes to bugs in the implementation of PRIME downwash, along with updates to eliminate specific compilation and list file errors. Three years later after the last update approved by the US EPA, this second revision is still falling short for odour dispersion modelling.

   The CALPUFF Modeling System is a non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation, and removal. According to the US EPA CALPUFF can be applied for long-range transport and for complex terrain.

METEOSIM offers the first worldwide service for Met data with transparent pricing

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metdata Meteosim has launched now "Metdata", the first worldwide meteorological modelled data-set for performing simulations using AERMOD, CALPUFF and ADMS dispersion models with open and transparent pricing. Weather series are generated through the combined use of modelling data by the Weather Research and Forecasting System (WRF) meteorological model with remote sensing data and instrumental information worldwide.

 There are a few companies around in the globe that sell meteorological data for dispersion modelling. However this is the first one to our knowledge that offers a public and transparent pricing to acquire meteorological data for your modelling. With "Metdata", the company Meteosim offers a flexible and fast way to calculate costs of met data acquisition. For example, the price for a WRF set of data ready for CALMET/CALPUFF varies between 250€ for 1 year of data and a resolution of 9 km, and 4250 € for 5 years of data and a spatial resolution of 1 km.

Modeling of Sewage Plant Gas Emission and HVAC using CFD

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sesion04 tarela07   In this sewage plant under consideration, the wastewater is moved vertically using eight Archimedes screw pumps. During the process of moving the wastewater upward, there is an emission of H2S from the surfaces of the Archimedes pumps. Traces of H2S have been detected inside of the building that houses the pump engines.

   The present paper evaluates a modification in the HVAC system of the building to mitigate the presence of H2S inside the building.

P. A. Tarela1 and F. E. Camelli2

1. CCyA Ingeniería, Buenos Aires, Argentina.
2. Laboratory for Computational Fluid Dynamics, Department of Physics and Astronomy, George Mason University, Fairfax, Virginia, USA.