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MODULE III |
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MODULE III |
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Room air
dehumidification
Drier supply air is directed into a room in order to extract excess moisture
content 
x (g/s). Decisive
factors are, on the one hand, the moisture difference between the desired room
air moisture x1 and the supply air moisture x2, and on the other hand, the supply
air volume V in m3/s. With a given difference x1 - x2 , the required air volume
will be:
2. Model
plant for technical service exercises
An experimental plant for the training of service technicians has been developed
and constructed for the project partner from Meran. This model plant contains
all the components of a complete air-conditioning plant, including a refrigerating
set and a test room. The control was realised with a direct digital control,
so that the area of control technology as an enhancement to electrical engineering
(see MODULE V) could also be demonstrated and practised.
Description of the plant:
An actual room will be air-conditioned with this plant in order to achieve realistic
conditions. The plant has been designed as a complete air-conditioning plant,
and constructed in such a way that the processes in the plant are visible at
all times. This means that all construction elements of the air-conditioning
plant have been provided with a Plexiglas pane in front. Due to the limited
spatial conditions, especially in classrooms, it seemed sensible to construct
the complete air-conditioning plant at a 1:2 scale, instead of with standard
sized components, in order to achieve smaller dimensions. The mounting was designed
in such a way that parts of the plant could be covered by plates, allowing all
partial functions, from the ventilating plant to the complete air-conditioning
plant, to be explained step by step. In extreme cases all of the construction
elements can be hidden by plates (see Fig. 22). Control is realised by means
of a DDC. Thereby, up to eight prepared control elements of the individual procedures
can be tried out.
The air-conditioning plant was constructed as follows:
Modular type with view window and pre-heater, filter, heat recovery, re-heater,
cooler, humidifier (steam), fans for supply and exhaust air, mounted completely
on a movable housing with a writing platform. The plant is constructed in such
a way that a modular set-up, from the simple ventilation plant to the complete
air-conditioning unit, is possible without a great deal of rebuilding. In addition,
the individual components are constructed in a reduced scale. The maximum dimensions
of the functional units are: circa: 30 x 30 x 30 cm, WRG: 30 x 30 x 50 cm. Because
we are dealing here with a training air-conditioning plant, the design of the
plant allows for a maximum capacity of 5 kW. All components are co-ordinated
to this capacity.
In detail these are:
1 x pre-heater of sheet metal parts, powder coated with Plexiglas sheets
on both sides, and with a quick opening mechanism.
Measurements: 30 x 30 x 30 cm
Capacity: 5 kW through electric heating bars - directed with a frequency converter
for continuous capacity control
Voltage: 400V/16A