Workbenches


The CACTVS molecule editor is a graphical input tool for molecular structures and is free of charge for non-profit use. It can be used as a stand-alone or as a dependent remote program of the CACTVS computation workbench. The software is available for aU platforms (excluding Macintosh systems).  [c.139]

At many workplaces, emissions occur randomly across a certain emission area (e.g., across the area of a workbench or grinding workpiece). In many cases these emissions are difficult to control using exterior exhaust systems because of the undefined emission location and because of work procedure flexibility. Additionally, severe influences (cross-flows) from the surrounding room often reduce the efficiency of single exhaust elements to a minimum. In such cases, booths are the appropriate choice for a local exhaust system.  [c.881]

Medium-sized workpieces (workbench size up to 4-5 m square base) often need to be treated during work processes. Depending on the treatment process, different types of emission areas are possible. The actual emission area due to the treatment may be small (e.g., during welding) but tune dependent, moving across the whole workpiece, or the emission area could be the whole surface of the workpiece (e.g., during spray painting). In both cases it is nearly impossible to realize an effective capture of the air contaminant while using external capture elements. Either the elements have to be readjusted every moment to ensure proper function or the exhaust airflow has to be increased to unrealistic values in order to increase the grasp of the capture elements.  [c.881]

Workbench type Booths of this type have at least one open face and thus may be laboratory fume cupboards, safety cabinets, or similar equipment.  [c.883]

Outside the jet and away from the boundaries of the workbench the flow will behave as if it is inviscid and hence potential flow is appropriate. Further, in the central region of the workbench we expect the airflow to be approximately two-dimensional, which has been confirmed by the above experimental investigations. In practice it is expected that the worker will be releasing contaminant in this region and hence the assumption of two-dimensional flow" appears to be sound. Under these assumptions the nondimensional stream function F satisfies Laplace s equation, i.e..  [c.962]

In the case of the free jet, the solution for the Aaberg exhaust system can be found by solving the Laplace equation by the method of separation of variables and assuming that there is no fluid flow through the surface of the workbench. At the edge of the jet, which is assumed to be at 0—0, the stream function is given by Eq. (10.113). This gives rise to  [c.963]

The exhaust opening is modeled as a finite-sized slot with a uniform velocity distribution. The workbench and the vertical wall below the exhaust slot form a streamline of fluid flow through which the fluid does not cross and, therefore, along this line we have T = 0. Between the slot and the jet, the vertical wall is also a streamline and from the dimensionalization given  [c.963]

As with the two-dimensional workbench problem, the numerical solution of this problem can be found by solving the full turbulent fluid flow equations using the methods described in Chapter 13.  [c.966]

A workbench makes use of a local air supply in conjunction with exhaust air to ensure good control of the contaminants generated on a bench process. The local exhaust removes the contaminants, while the local supply air protects the operator and/or the products against airborne contaminants. The local supply air improves the thermal environmental conditions by introducing cool dehumidified air in a hot environment. This ensures that the operator s thermal comfort is maintained in areas of high temperature, where full air conditioning of the entire workspace is nor economically feasible.  [c.973]

Low-velocity supply air enters the space above the operator, providing a clean air zone around an operator working in a contained area. It is arranged so that the contaminated air flows toward the exhaust openings. The low-velocity supply air is usually discharged vertically above the worker, although horizontal flow can be used. A typical example of a workbench is shown in Fig. 10.88.  [c.973]

FIGURE 10.88 Example of a workbench with local supply and exhaust ventilation.  [c.974]

First the velocity field is computed for the room the configuration is shown in Fig. 11.14. The regional purging flow rate is computed for regions The computed values are tabulated in Table 11.1. As can be expected. Up is highest in the region near the inlet, and it is low in the region near the workbench. It should be pointed out that Up is dependent not only on the flow conditions, but also on the size of the region. The fact that Up Is smallest for region 1 is that most of the supplied air is extracted via the other outlet (fi).  [c.1048]

The two versions of the Aaberg exhaust system, namely an axisymmetri-cal version and a workbench version, both work on the same principle. In order to illustrate the principle of the Aaberg we describe the axisymmetrical version but the full theoretical, computational, and experimental basis is presented for both systems.  [c.956]

E. ]. Hollis. Investigation of an Aaberg Workbench. HSL Project Report lR/I/VE/95/2. 1 995.  [c.1010]


See pages that mention the term Workbenches : [c.1480]   
Industrial ventilation design guidebook (2001) -- [ c.148 , c.881 , c.925 , c.926 , c.927 , c.928 , c.929 , c.930 , c.931 , c.932 , c.933 , c.978 , c.1489 ]