Installation Of Partition Research Articles

Exposure Risk to Medical Staff in a Nasopharyngeal Swab Sampling Cabin under Four Different Ventilation Strategies

Medical staff working in a nasopharyngeal swab sampling cabin are exposed to a higher exposure risk of COVID-19. In this study, computational fluid dynamics (CFD) are used to evaluate the exposure risk to medical staff in a nasopharyngeal swab sampling cabin of Chinese customs under four different ventilation strategies, i.e., multiple supply fans ventilation (MSFV), multiple exhaust fans ventilation (MEFV), single exhaust fan and outer windows closed ventilation (SEFV), and single exhaust fan and outer windows opened ventilation (SEFV-W). The impact of physical partitions on exposure risk is also discussed. The results show that MSFV performed best in reducing exposure risk. No significant difference was found between MEFV and SEFV. SEFV-W performed better than SEFV with a ventilation rate of 10–50 L/(s∙Person), while it performed worse with a ventilation rate of 50–90 L/(s∙Person). The exposure risk to medical staff did not decrease linearly with the increase in the ventilation flow rate under the four ventilation strategies. For MSFV, the installation of partitions is conducive to the reduction in the exposure risk. This study is expected to provide some guidance for ventilation designs in sampling cabins.

Studying the effect of multifunctional partitions on temperature indicators at offices of the open space type

Existing partitions used in offices and at enterprises were considered, an analysis of use of partitions to ensure comfortable working conditions was performed and supplements to the classification system were systematized and introduced. Attention was drawn to the fact that the existing classification systems consider partitions based on the convenience of their use, material and design missing their influence on meteorological factors. As a rule, partitions are made from one or two layers of materials having different properties. They separate rooms or a working space at various heights from the floor. It was shown in the work that incorrectly arranged partitions made of expensive building materials can bring to naught the planned objectives of improvement of working conditions. In premises with high ceilings, conditions of irrational heating are likely to be created, both in the premises in general and concrete working zones. The studies have shown that this is solved by installation of partitions that direct and retain heat. It was found in the course of the study that temperature indicators in separated rooms are not significantly affected by the partition material type but the degree of room separation with partition by height is of paramount importance. As a result of temperature studies in premises of open space type where various partitions (glass pipes in a metal frame, ceramic panels, expanded polystyrene) were installed, it was established that partitions can significantly influence the temperature indicators but only if the room is completely separated in height. It was established that the material of partition does not affect the temperature indicators if separation is not complete (less than 100 %). The studies have proved the prospects of the scientific substantiation of the use of partitions and definition of connection between room separation and the factors affecting worker’s performance capability

CFD Analysis on Thermal Comfort and Indoor Air Quality Affected by Partitions in Air-Conditioned Building

This paper presents a CFD analysis on thermal comfort and indoor air quality affected by partitions in an air-conditioned building. CFD experiments are carried out to simulate variables of indoor air before/after installation or removal of partitions. Accordingly, the Predicted Mean Vote (PMV) is determined as an indicator of thermal comfort while the carbon dioxide concentration within an air-conditioned space is used for the assessment of indoor air quality. Some simulated results are validated by measurements with good agreement where a case study is conducted in an air-conditioned space of a library. With the proposed methodology, it can be recommended in a case study that the significant effects of partition on thermal comfort are observed where the area with neutral sensation and slightly-cool sensation reduces significantly. The occupants feel uncomfortably cold after installing partition. The carbon dioxide concentrations slightly increase in some areas but the average concentration remains acceptable according to ASHRAE standard. Without the reinforcement of the air-conditioning units, the installation of partition at the desired location is not encouraged regarding to occupant’s thermal comfort and indoor air quality.

CFD Analysis on Thermal Comfort and Energy Consumption Effected by Partitions in Air-Conditioned Building

This paper presents a CFD analysis on thermal comfort and energy consumption effected by partitions in an air-conditioned building. CFD experiments are carried out to simulate variables of indoor air before/after installation or removal of partitions. Accordingly, the Predicted Mean Vote (PMV) is determined as an indicator of thermal comfort while the cooling load of make-up air is calculated for energy consumption. Some simulated results are validated by measurements with good agreement where a case study is conducted in an air-conditioned space of a library. With the proposed methodology, it can be recommended in a case study that the significant effects of partition on thermal comfort are observed in the regions where occupants feel warmer and in the regions where occupants feel uncomfortably cool after installing the partition while the energy consumption increases by 24%. The installation of the partition at the desired location is not encouraged regarding to occupant's comfort and energy consumption without modification of the air-conditioning units.

Formation of Vortex Structures in a Vertical Enclosure with Finning of Its Both Walls

One of the efficient methods of controlling heat transfer is the installation of barriers or fins on heat transfer surfaces. A numerical model of a free-convective flow and heat transfer in a high closed enclosure in the presence of fins on its isothermal side walls has been developed. The Navier-Stokes equations in two-dimensional statement were solved numerically. The influence of the height of the fins and of the spacing between them on the flow structure, local and average heat transfer was investigated. Calculations were carried out in the range of Rayleigh numbers Ra = 103−105 , when there exist laminar and multicellular regimes of convection. Two types of fins have been considered: adiabatic and with an infinitely high thermal conductivity. The effect of heat transfer rate decrease is equal to about 30% as compared to smooth walls. For heat-conducting fins heat transfer enhancement may reach 200% and above. Their influence on the aerodynamic and thermal structure was investigated in a number of experimental and computational works. It was shown earlier that installation of partitions in a square cavity may lead to a great decrease in the heat transfer rate. The effect of this decrease is attained due to the decrease in the intensity of air vortex flow in the cavity, therefore the enhancement of heat release is observed for both nonconducting and conducting partitions. The installation of fins on the side walls of high vertical enclosures leads to a substantially more complex structure of flow inside an enclosure. The average heat transfer rate for such conditions depends on a large number of parameters: the Rayleigh numbers, aspect ratio of an enclosure (A = H/L), spacing between fins (h), number of fins (n), as well on the fin height (l). The aim of the present work was to numerically investigate a two-dimensional flow and heat transfer in a vertical finned enclosure and determination of the regimes with a lowered and intensified heat release. Since the thermal conductivity of fins has a strong effect on heat release, two-extreme cases are investigated in the work: nonconducting (adiabatic) fins and fins with an infinitely high thermal conductivity (λf → ∞). Thus, the limits of the influence of finning on the change in heat transfer with fins installed on the side surfaces in a vertical slit were determined.