Research Basics in Use. Texts "In the air conditioner", "Dehumidification systems within shipbuilding industry", страница 5

Thirdly as the room air, which is being cooled, passes across the indoor coil, moisture may also be removed from it and drained to an outlet outdoors. This moisture condenses on the indoor coil in the same way as moisture in your breath when you breathe on a cold window.

First and foremost is the fact that as well as heat being extracted from the air in the area to be cooled and transferred outside, the indoor air is also dehumidified. This improves comfort conditions in hot, sticky weather.

The operation of most air conditioners is controlled by a thermostat which is either built into the air conditioner or independently mounted. The thermostat is adjustable so that once you set it to your desired temperature it automatically maintains it. And last but not least in domestic air conditioners the compressor is switched on by the thermostat, only as long as necessary to maintain the room temperature thus ensuring the lowest operating coast.

3. Talk about the plan of your research.

B. Addition

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2. Text

Ship dehumidifying

Engine room spaces

The engine room includes associated spaces – control room, steering gear room, workshop and spare parts store, also needs protection. In addition, here is to be found various devices sensitive to humidity such as electric motors, regulation equipment, etc.

As previously mentioned, the dehumidification is arranged in a closed system with distribution of the dry air to the various departments of the engine room via a provisional duct system. The process air (return air) is obtained through free suction at the dehumidifier. For reactivation, use is made of external air conducted via a duct to the dehumidifier. The wet air from the dehumidifier is discharged into the open.

Especially important is dimensioning. As a standard value for dimensioning an adequate dry air flow can be determined at 0.1–0.2 air changes/h calculated in terms of the volume of the engine room. If it is acceptable that the humidity is not under control at certain times 0.05 air changes/h can be used for dimensioning. In such a case the control room should be supplied with a separate dehumidifier.

Besides engine room spaces accomodation is also dehumidified. By dehumidifying cabins and public rooms the furnishing are protected against damage by moisture. Woodwork and textiles are preserved intact is the humidity can be limited to 50% RH, i.e. the same value which prevents corrosion attacks on steel details.

Closed system

For the distribution of dry air use is made of the existing central unit for the air conditioning plant operating with 100% return air, and with the fan running at reduced speed.

Since the central unit deals with a comparatively large air flow only a part of the recirculated air is dehumidified. The dry air is conducted via a duct to the suction side of the central unit. The intake for reactivation air on the dehumidifier as well as the outlet for wet air are linked by ducts to the open.

Dimensioning

The dehumidifier is set for a dry air flow corresponding to 0.2–0.3 air changes/h calculated in terms of the total volume of the spaces served.

Moreover wheel house, radio cabin and radar cabin are also dehumidified. These cabins are normally linked to the air conditioning system and are thus included in the spaces dehumidified via a central unit in accordance with the above. In other cases cabin separate dehumidification must be provided – closed system – to protect the sensitive electronic equipment.

3. Talk on the aims and tasks of your research.

C. Contrast

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