Damping, fans

With a fan-furnace heating system, once the temperature is reached, the fan is controlled to start automatically. Should fan failure occur, provision should be made to damp down the furnace automatically to avoid overheating s causing tube damage. 

The next time you re sweltering hot, try hanging a damp sheet in front of a fan (make sure there s enough space between the two so the sheet doesn t catch on the fan blades) or wrap yourself in the sheet. If anyone asks what you re doing, say that you re harnessing the latent heat of evaporation. 

The conversion to carbonate was tried with a 400-book treatment run in which the excess diethyl zinc was destroyed with alcohol after partially backfilling the chamber with carbon dioxide. After adding water to hydrolyze the zinc cellulosate compound, the backfilling with carbon dioxide was continued to nearly atmospheric pressure to force the damp carbon dioxide into the books. At the same time, the atmosphere in the chamber was circulated with a fan for 24 h to insure good contact. After such treatment, paper samples from the books showed effervescence when immersed in dilute acid, indicating the presence of carbonate. Samples of paper from books previously treated with diethyl zinc (where the carbon dioxide was not used) showed no such effervescence. 

If you are growing herbs for medicinal use, the harvested plants should be hung upside down in a cool, dark, ventilated place. Since dampness may cause molds on drying plants, the drying room should be fairly dry as well. In regions with high humidity, use a fan to blow the moist air out of the drying area and to draw in drier air. 

By 1942 the depot had been operational for nearly four years but nothing had been done to reduce the humidity. Storage conditions were very unsatisfactory and in August it was noted that the recently completed No.9 District was panicular damp. A report on the situation concluded that natural ventilation by itself was totally ineffective, so the following January exhaust fans were fitted to the outlet shafts of each district, but this had little effect on the humidity underground. 

The physical construction of an indnction motor is greatly influenced by the enviromnent and ambient conditions. The environmental conditions include considerations for explosion, corrosion, dampness, ingress of dnst and solid particles, proximity to human operators, cost and economics. Ambient conditions relate to snrface temperatnre, methods of cooling, fan design and appropriate derating factors. 

Pilot scale data for amine removal have been provided by Finland. A biofilter unit (diameter 0.8 m, height 1 m) was installed in a core-making off-gas line, after an acid scrubber. The equipment included a fan and a dewing unit, with which the dampness of the biofiltration unit was adjusted to an optimum level. The odour removal was measured using an olfactometer. Results for the odour and total hydrocarbon levels are given in Table 4.50. Variations in the input analysis are due to process variations. The results show that filtration results in a significant odour and hydrocarbon reduction. 

When the final vial has been sampled, the sampler arm can be stopped in the wash position until the last trace on the gas analyser record has ended. The pump, and then without delay, the oxygen flow, irradiator fan and UV lamp arc all turned ofi. Before removing the pressure plate from the autoanalyser pump, it is advisable to damp the transmission tubing leading to the irradiator coils, thus keeping them filled with irradiated water until the next analyses. 

Keep machinery properly adjusted to manufacturer s instructions. Use damped or rubber lined containers for catching components. Switch off plant not in use, especially fans. 

The way this heat is removed depends greatly on the size of the fuel cell. With fuel cells below lOOW it is possible to use purely convected air to cool the cell and provide sufficient airflow to evaporate the water, without recourse to any fan. This is done with a fairly open cell construction with a cell spacing of between 5 and 10 mm per cell (Daugherty, 1999). The fact that damp air is less dense than dry air (perhaps counterintuitive, but true) aids the circulation process. However, for a more compact fuel cell,... 

Fig. 22.4 Experimental test rig for the similarity trials of laminar thread breakup under the influence of cross-wind flow. The liquid is pumped (i) from the collective tank (2) to the buffer tank (i) where pulsations are damped. Different capillary (4) configurations were used within this work including different diameters and inclination angles a. The capillary is mounted in the gas flow channel (5) made by PMMA. An axial fan (6) providing under-pressure controls the air velocity. Behind the flow, a light panel is installed and in front of it a CCD camera is placed [33]...

A damping value of 5 percent shall be used for new analyses for non-pressure retaining parts of equipment, such as motor control centers, cabinets, panels, racks, fans and transformers, etc. See IEEE-344-75 and "Restart Criteria for Seismic Qualification", a memorandum from Patterson to Peckinpaugh, dated November 1988). Higher damping values may be used for special designs when justified. 

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