Sentence examples for return air corner from inspiring English sources

Site monitoring results showed that: the technology of roof high roadway drainage combined with other drainage can significantly reduce the gas concentration at the return air corner of the goaf, control the gas emission from the goaf to the coalface, play a role of "split-flow" of gas flow, and reduce the gas concentration in the goaf.

Open image in new window Fig. 75 Variation curves of gas concentration at the upper corner of coalface, coalface and in return air after coal extraction.

Figure 75 shows the gas concentration variations at the upper corner of the coalface, the coalface and in the return air since the extraction of the No. 8105 coalface.

As can be seen from the diagram, coalface gas emission rates gradually increased, the volume of gas drainage increased, while the gas concentration at the upper corner of the coalface, in the coalface and the return air gradually leveled off, and achieved a zero gas overlimit.

From $2,620 to $26,960, including return air fare.

After the connection, a 2BEC80 gas drainage pump was used to drain the gas, the gas concentrations were maintained between 1.5 % and 2.2 % in the high drainage roadway, between 0.2 % and 0.3 % at the upper corner of working face, between 0.2 % and 0.3 % at the tail of the rear scraper conveyor, and between 0.15 % and 0.25 % in the return air.

Gas concentration in return air was less than 0.6%%.

The return air volume was 2290 2700 m3/min during gas drainage period.

The return air temperature should be hot, not cold.

When the blower in an air handler is activated, it creates negative air pressure in the return air ducts.

Return air grilles and supply air diffusers for the Heating, Ventilating and Air Conditioning (HVAC) system.