Assessment of effectiveness of organizational measures for prevention of COVID-19 among employees of large industrial enterprises

According to the regional information fund of social and hygienic monitoring, 1518 cases of 01.07.2021 diseases were registered among those working at industrial enterprises of the Republic of Buryatia as of COVID-19, of which the share of the joint-stock company Ulan-Ude Aviation Plant (hereinafter – U-UAP, aviation plant) accounts for 30.8 % or 467 cases, in the public joint-stock company Territorial Generating Company No. 14 (hereinafter – TGC-14, heat power plant) – 15.7 % or 239 cases. The incidence rate of COVID-19 in U-UAP amounted to 871.76 per 10 thousand workers, in TGC-14 – 2280.53 per 10 thousand workers. The evaluation of the effectiveness of COVID-19 prevention showed that the complex of sanitary and anti-epidemic (preventive) measures taken in the pandemic among those working at the aviation plant ensured the control of the spread of the incidence of coronavirus infection by 2.6 times, compared with the heat power plant. Keywords: disinfectants, new coronavirus infection of COVID-19, industrial enterprises, sanitary and anti-epidemic (preventive) measures, Republic of Buryatia.

WORKING FLUID REVIEW ON THE SYSTEM ORGANIC RANKINE CYCLE

Pada penelitian ini, penulis melakukan review penggunaan fluida kerja ORC yang disimulasikan menggunakan EES dan melakukan review pada beberapa jurnal yang dilakukan sebelumnya. Fluida kerja yang dianalisa adalah isopentane sebagai fluida kerja yang dipakai, isobutane dan R245fa, dimana isobutane menghasil power output yang lebih tinggi dibandingkan dengan fluida sekunder lainnya karena enthalpi uap yang masuk ke turbine dan enthalpi uap yang masuk ke kondenser yang dihasilkan lebih tinggi dan ini menyebabkan kalor yang masuk ke dalam sistem ORC lebih tinggi dibandingkan dengan fluida kerja lainnya. Pada sistem ORC banyak pilihan fluida kerja dan bisa diaplikasikan dalam sistem baik secara aktual maupun masih dalam research, baik dalam off design dalam bentuk paper, jurnal maupun aplikasi teknologi secara langsung dalam pembangkit listrik panas bumi, waste heat recovery plant atau tipe combine cycle lainnya. Pada beberapa sistem yang diteliti, R227ea memiliki efisiensi thermal yang lebih baik daripada fluida sekunder lainnya. Sedangkan pada waste heat power plant, R134a memiliki efisiensi yang lebih baik dari fluida sekunder yang diteliti. Dan pada research lainnya HFE-301 memiliki efisiensi thermal sebesar 85% pada aplikasi Radial inflow turbine dengan kecepatan sekitar 60.000 rpm dan menghasilkan daya sebesar 1,5 kW.

Oxidized humic acids from the soil of heat power plant

Humic acids isolated from the soil of heat power plant (HA-E) contaminated with oil were analyzed by the Fourier Transform Infrared spectra (FTIR). In comparison with humic acids standard (HA-S) luck of intense broad band of stretching vibrations of hydrogen-bonded hydroxyl groups (3600-3200 cm-1) is evident. HA-E have a pick at 1649 cm-1 which could belong to carbonyl groups. HA-E are heavily oxidized and among isolated microorganisms Achromobacter denitrificans may be responsible for such intensive oxidation of HA-E. To phylogenetically diverse nitrate-reducing microorganisms that have the capacity to utilize reduced HA as electron donors in soils, we can ad A. denitrificans.

Development of Total Capital Investment Estimation Module for Waste Heat Power Plant

Power plants with waste heat collection and utilization have gained increasing interest in the high energy-consuming industries, such as steel-making and cement manufacturing, due to its energy efficiency. Waste heat power plants possess some intrinsic characteristics, for instance, the main equipment and the working fluids. However, at the time of this research, we could not find an economic analysis suitable to address the specialized aspects of waste heat power plant, making it difficult to measure the total capital investment needed for the business feasibility assessment. In this paper, we introduced our total capital investment estimation module developed for a waste heat power plant by considering its intrinsic features. We followed a systems engineering approach in designing and developing our module. We performed a requirements analysis of the stakeholders related to the waste heat power plant. Simultaneously, we consider the technical aspects by exploring the working fluids and main equipment implemented in the plant. Then, we developed the cost models for each equipment and used them as the basis of the proposed total capital investment estimation module. The performance verification showed that our proposed method achieved the initial accuracy target of a 5.78% error range when compared to the real data from the reference case study.