Systems - HOWATHERM
Systems - HOWATHERM Systems - HOWATHERM
8 Design characteristics Adiabatic cooling In order to achieve the specified performance for the HP heat recovery system we have defined a number of minimum design characteristics. In the airflow direction the HP heat exchanger consists of about eight rows in the depth direction per register to make the system as easy to clean as possible. This design conforms fully to VDI 6022 and VDI 3803 conditions. Registers with installation depths exceeding 300 mm (staggered arrangement) must be split in the depth direction. The individual registers are thus accessible from each side and can be easily pulled out for convenient cleaning to meet applicable hygiene requirements. During the summer months, adiabatic cooling with the HP heat recovery systems has been found to give good results. The adiabatic cooling process is based on the use of an integral humidifier in the exhaust air- For enhanced corrosion protection our fins are plastic-coated or made entirely of copper. Aluminium fins are used for standard operating conditions. We thus provide ideal hygiene conditions due to optimum cleaning characteristics. The condensate need not pass the entire heat exchanger but will collect in the condensate tray after the individual registers. Depending on the application, we either use a staggered tube arrangement for optimum performance characteristics or an aligned tube system which minimizes pressure losses at a slight penalty in terms of transfer efficiency while being even less susceptible to fouling. The energy gained from the heat recovery process is used for cooling in both winter and summer operation, yielding further energy savings. Heat exchangers are optimized for thorough cleaning with water flow which humidifies the extract air adiabatically in several stages to cool it. HYDROPLUS SYSTEM
Principle and operation In our HYDROPLUS system, the heat exchanger that is a necessary part of any airhandling unit is simultaneously used as a contact body. It is sprayed with water via an array of nozzles in the extracted airflow on the air inlet side. Air from the system passing over the contact body is adiabatically humidified in this process. Design details A contact body is assembled from numerous aluminium fins arranged in parallel at 2,5 mm centers. The fins carry a durable coating which increases its surface area substantially while giving it lasting hydrophilic properties, thus facilitating wetting. At the same time, the coating protects the contact body from corrosion. Air humidification - how is it achieved? The spray is applied evenly to the entire surface area of the contact body. The atomizing nozzles create a very fine droplet range. A film of water forms on the fins and is exposed to laminar airflow. An exchange of substances takes place between the water on the fins and the air passing over it. What are the benefits? The need for an additional humidifier body, with attendant pressure loss, is eliminated. We thus reduce the installation length of the entire unit, saving on investment cost. The combination of both systems provides further energy and cost savings. Here, too, the component is used as a heat exchanger and humidifier at the same time. The HP heat recovery / HYDROPLUS system is divided into several stages. Each stage comprises an adiabatic evaporation humidifier providing adiabatic humidification and hence, cooling, before the air enters the next stage. If we compare this multistage system to a single-stage arrangement, we find that the separation of the Hydroplus System - in combination with the HP heat recovery system HOWATHERM Contact- humidifier HYDROPLUS system A contact humidifier for adiabatic air humidification HYDROPLUS SYSTEM 9
- Page 1 and 2: HP-WRG SYSTEM HYDROPLUS SYSTEM Ther
- Page 3 and 4: Heat recovery based on a recirculat
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- Page 11 and 12: Hygiene The water quality should co
8<br />
Design<br />
characteristics<br />
Adiabatic cooling<br />
In order to achieve the specified performance<br />
for the HP heat recovery system<br />
we have defined a number of minimum<br />
design characteristics.<br />
In the airflow direction the HP heat exchanger<br />
consists of about eight rows in<br />
the depth direction per register to make<br />
the system as easy to clean as possible.<br />
This design conforms fully to VDI 6022 and<br />
VDI 3803 conditions. Registers with installation<br />
depths exceeding 300 mm (staggered<br />
arrangement) must be split in the<br />
depth direction.<br />
The individual registers are thus accessible<br />
from each side and can be easily pulled<br />
out for convenient cleaning to meet applicable<br />
hygiene requirements.<br />
During the summer months, adiabatic cooling<br />
with the HP heat recovery systems has<br />
been found to give good results. The adiabatic<br />
cooling process is based on the use of<br />
an integral humidifier in the exhaust air-<br />
For enhanced corrosion protection our fins<br />
are plastic-coated or made entirely of copper.<br />
Aluminium fins are used for standard<br />
operating conditions. We thus provide<br />
ideal hygiene conditions due to optimum<br />
cleaning characteristics.<br />
The condensate need not pass the entire<br />
heat exchanger but will collect in the condensate<br />
tray after the individual registers.<br />
Depending on the application, we either<br />
use a staggered tube arrangement for<br />
optimum performance characteristics or an<br />
aligned tube system which minimizes pressure<br />
losses at a slight penalty in terms of<br />
transfer efficiency while being even less<br />
susceptible to fouling.<br />
The energy gained from the heat recovery<br />
process is used for cooling in both winter<br />
and summer operation, yielding further<br />
energy savings.<br />
Heat exchangers are optimized for thorough cleaning with water<br />
flow which humidifies the extract air adiabatically<br />
in several stages to cool it.<br />
HYDROPLUS SYSTEM
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