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Air monitoring data at the water tower monitor (WTM) in Rhinelander, WI shows SO2 concentrations exceeding the 1-hour SO2 NAAQS and Expera Rhinelander Mill’s 63 m tall cyclone boiler stack is the primary contributor to the monitored exceedance. Making matters more complicated, the AERMOD predicted “design value” concentration at the WTM is in compliance and more than a factor of two lower than observations. Hence, a standard AERMOD modeling approach cannot be used to determine a compliance solution. After investigating the building geometry, it was noticed that the 38 m high Boiler 7 building corner is directly upwind of the stack when the wind blows toward the WTM. This results in the formation of corner vortices that enhance building downwash, an effect that is not accounted for in AERMOD. To develop a compliance solution, a multi-phased approach was used. First, wind tunnel modeling was conducted to determine an EPA approved 90 m GEP stack height that is taller than the 75 m formula GEP stack height. Next, compliance at the 90 GEP stack height was assessed using two alternate methods. Method 1 employed an alternate model, HYWINMOD, a validated hybrid wind tunnel/numerical model. Method 2 utilized AERMOD in an approved non-standard manner. AERMOD was run without building downwash affects but the results were adjusted to account for building downwash affects using wind tunnel modeling. Both methods provided very similar and manageable compliance solutions.
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Air monitoring data at the water tower monitor (WTM) in Rhinelander, WI shows SO2 concentrations exceeding the 1-hour SO2 NAAQS and Expera Rhinelander Mill’s 63 m tall cyclone boiler stack is the primary contributor to the monitored exceedance. Making matters more complicated, the AERMOD predicted “design value” concentration at the WTM is in compliance and more than a factor of two lower than observations. Hence, a standard AERMOD modeling approach cannot be used to determine a compliance solution. After investigating the building geometry, it was noticed that the 38 m high Boiler 7 building corner is directly upwind of the stack when the wind blows toward the WTM. This results in the formation of corner vortices that enhance building downwash, an effect that is not accounted for in AERMOD. To develop a compliance solution, a multi-phased approach was used. First, wind tunnel modeling was conducted to determine an EPA approved 90 m GEP stack height that is taller than the 75 m formula GEP stack height. Next, compliance at the 90 GEP stack height was assessed using two alternate methods. Method 1 employed an alternate model, HYWINMOD, a validated hybrid wind tunnel/numerical model. Method 2 utilized AERMOD in an approved non-standard manner. AERMOD was run without building downwash affects but the results were adjusted to account for building downwash affects using wind tunnel modeling. Both methods provided very similar and manageable compliance solutions.
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Ron Petersen, PhD, CCM, FASHRAE
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The 2013 EPA Draft SO2 NAAQS Designations Modeling Technical Assistance Document states that an accurate characterization of the modeled facility is critical. The document also says that that if the building information is not accurate, downwash will not be accurately accounted for in AERMOD. This presentation will discuss two generic facilities, one with a 31 m high long narrow solid building and a single stack that is 1.5 times the building height. The second facility has two 50 m high porous structures located near a single stack of the same height. Accurate building information was assembled for these two facilities and input into BPIP. The BPIP AERMOD input file was analyzed and the following problems were found: 1) building widths and/or lengths outside the range of AERMOD theory; and 2) the porous structures were assumed to be solid. In spite of inputting accurate site information, BPIP generated building dimensions for AERMOD input will not result in accurate predictions. Consequently, an EPA “Source Characterization” study was conducted where “Equivalent Building Dimensions” were defined that more accurately model the dispersion for these two sites. AERMOD was then run using the original BPIP determined inputs and the refined inputs based on a more accurate “Source Characterization.” With refined BPIP inputs, the maximum 1-hr concentrations decreased by factors of 2 to 3.5 Due to the stringent nature of the 1-hr NAAQS, clearly a more accurate source characterization study should be high on the list of refined modeling options.
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Profitbomber adalah sebuah sistem yang dirancang untuk membantu anda mendapatkan income cepat setiap hari, berulang - ulang, dengan modal terjangkau dan Potensi Income tanpa batas.
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