Conserving energy and heating your swimming pool with solar by Energy Efficiency and Renewable Energy Clearinghouse (U.S.)

By Energy Efficiency and Renewable Energy Clearinghouse (U.S.)

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E. in close proximity to the building under investigation. Ideally, one would take measurements well away from the influence of obstacles, but in practice the instrument is normally placed a few metres above the building or collector. Because of this proximity, the location needs to be chosen with care. The airflow pattern near buildings can be very complex and the aim is to locate the anemometer such that there is no large vertical component of velocity and so that there is no ambiguity in the indicated direction.

The number of revolutions of the vane wheel is proportional to the amount of water flowing. The measuring 3 Measuring Instruments chamber is vacuum sealed and is thus protected from lime deposits and corrosion, but the wheel itself is sensitive to dirt, and should be protected by a filter. When the flowmeter body is sealed, the rotation is then transferred via magnetic transformation. Remote reading may be achieved. A free run of straight piping is required upstream of the flowmeter. c. Vane Wheel Flowmeter (air type) In this type of meter, a vane propellor is moved by an air stream, and the propellor is mounted transversely in a duct.

One major drawback, however, is that the instrument is adversely affected by freezing temperatures. g. Electrical resistance hygrometer This type of instrument utilises some electrical resistance or dielectrical property variations of an hygroscopic material. These devices are generally suitable for continuous measurements, they are not too expensive and give an acceptable degree of accuracy. In practice, dew-point or infrared hygrometers, because of their complexity, their accuracy (1% of relative humidity) and their cost, have to be considered more as laboratory apparatus than as field trial devices.

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