The rotating packed bed(RPB) with split packing is a novel gas–liquid contactor, which intensifies the mass transfer processes controlled by gas-side resistance. To assess its efficacy, the mass transfer characterist...The rotating packed bed(RPB) with split packing is a novel gas–liquid contactor, which intensifies the mass transfer processes controlled by gas-side resistance. To assess its efficacy, the mass transfer characteristics with adjacent rings in counter-rotation and co-rotation modes in a split packing RPB were studied experimentally.The physical absorption system NH3–H2O was used for characterizing the gas volumetric mass transfer coefficient(kyae) and the effective interfacial area(ae) was determined by chemical absorption in the CO2–NaO H system. The variation in kyaeand aewith the operating conditions is also investigated. The experimental results indicated that kyaeand aefor counter-rotation of the adjacent packing rings in the split packing RPB were higher than those for co-rotation, and both counter-rotation and co-rotation of the split packing RPB were superior over conventional RPBs under the similar operating conditions.展开更多
With the rapid development of building technology,transparent envelope is more and more widely used,which makes the indoor environment of buildings more and more affected by solar radiation.However,the effects of sola...With the rapid development of building technology,transparent envelope is more and more widely used,which makes the indoor environment of buildings more and more affected by solar radiation.However,the effects of solar radiation are not included in the PMV model.The Corrected Predicted Mean Vote(CPMV)model considering solar radiation was previously proposed and verified in northern China.In order to expand the applicability of the CPMV model to the hot summer and cold winter(HSCW)zone of southern China,a field study was conducted in an office building in Nanjing.A total of 686 valid questionnaires were recovered during the surveys in two summers in 2019 and 2020.The results show that the evaluation value of CPMV is highly consistent with the actual thermal sensation vote(TSV)when the corrected operative temperature is below 30℃.However,when the corrected operative temperature is above 30℃,the CPMV value is higher than TSV,because it underestimates the tolerance of human body to the hot environment in Nanjing.The thermal neutral temperature is 26.12℃(CPMV)and 26.28℃(TSV)respectively,which is higher than that in winter and summer in northern China.This study fills the blank in the application of CPMV model in southern China.The CPMV model can accurately evaluate the thermal comfort of indoor environment affected by solar radiation,which is worthy of promotion and application to other types of buildings and areas.展开更多
基金the National Natural Science Foundation of China(21376229,21206153)
文摘The rotating packed bed(RPB) with split packing is a novel gas–liquid contactor, which intensifies the mass transfer processes controlled by gas-side resistance. To assess its efficacy, the mass transfer characteristics with adjacent rings in counter-rotation and co-rotation modes in a split packing RPB were studied experimentally.The physical absorption system NH3–H2O was used for characterizing the gas volumetric mass transfer coefficient(kyae) and the effective interfacial area(ae) was determined by chemical absorption in the CO2–NaO H system. The variation in kyaeand aewith the operating conditions is also investigated. The experimental results indicated that kyaeand aefor counter-rotation of the adjacent packing rings in the split packing RPB were higher than those for co-rotation, and both counter-rotation and co-rotation of the split packing RPB were superior over conventional RPBs under the similar operating conditions.
基金This work was supported by the 13th Five-Year National Science and Technology Support Key Project of China(No.2017YFC0702501).
文摘With the rapid development of building technology,transparent envelope is more and more widely used,which makes the indoor environment of buildings more and more affected by solar radiation.However,the effects of solar radiation are not included in the PMV model.The Corrected Predicted Mean Vote(CPMV)model considering solar radiation was previously proposed and verified in northern China.In order to expand the applicability of the CPMV model to the hot summer and cold winter(HSCW)zone of southern China,a field study was conducted in an office building in Nanjing.A total of 686 valid questionnaires were recovered during the surveys in two summers in 2019 and 2020.The results show that the evaluation value of CPMV is highly consistent with the actual thermal sensation vote(TSV)when the corrected operative temperature is below 30℃.However,when the corrected operative temperature is above 30℃,the CPMV value is higher than TSV,because it underestimates the tolerance of human body to the hot environment in Nanjing.The thermal neutral temperature is 26.12℃(CPMV)and 26.28℃(TSV)respectively,which is higher than that in winter and summer in northern China.This study fills the blank in the application of CPMV model in southern China.The CPMV model can accurately evaluate the thermal comfort of indoor environment affected by solar radiation,which is worthy of promotion and application to other types of buildings and areas.
