SOLAR HEATING OF SWIMMING POOLS
The Problem is Familiar

The climate in northern Thailand is
very pleasant during the winter
season. But outdoor swimming
pools are quite uncomfortable
during the cold season, if not
heated. An indoor pool has to be
heated nearly all year round, even
in the hot season. Heating of swimming pools is an ideal application for solar
energy. Not very high temperatures are needed, but large
quantities of water have to be heated, so it make sense to
operate such an installation with a large flow rate at relatively
low temperature level. OKU panels are used to cover large areas
to produces optimum efficiency.
Chiang Mai Solar is a brand of Oelmaier Technology Company Limited
40 Moo 2, Si Bunrueang Road, Soi 4, T. Nonghoi, A. Muang, Chiang Mai 50000, Thailand,
info@chiangmaisolar.com

Low pressure drop, approx. 0.003 bar at 200 l/h/m²
Flow rate 150 to 250 l/m²/h
Molded in one piece, homogeneous black
Weight approx. 6 kg/m², water content 6 l/m²
Testing pressure 4.5 bar at NT
Working pressure up to 1.2 bar - 40°C
Efficiency up to approx. 80% - power up to 0.8 kWh/m²
Average value 0.5 to 0.6 kWh/m²
Non-corroding, resistant to swimming-pool water chemicals
Pool water pumped direct through absorber
Idling proof
Temperature resistant from -50 to + 115°C
Full area through ascendable, supports human weight
Modular assembly system, easy to install
CONFIGURATION OF OKU POOL HEATING
Operation with Filter Pump or with Separate Pump

For large pools, the filter pump is operated all day long. Therefore
it make sense to connect the solar absorbers to the filter pump
and run all filtered water to the solar absorber.
For small pools and also to save energy the filter may operates
only for limited periods during the day, while the water heating
should circulate whenever the sun shines. Here the water is
pumped through the absorbers by an auxiliary circulation pump.
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DESIGN
Size of Pool Heating System

The recommended absorber area is
about 50% of the pool surface
area. If the pool is covered during
night, it may need only 30% of the
pool surface area. A temperature
increase of about 4 - 7°C compared
to unheated swimming pools can
be reached.
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PARTS
Pool Heating Accessories and Options

OKU Obermaier in Germany offers
a range of accessories and control
equipment. To keep the transportation and importation cost low it
is recommended to select carefully
which options are really needed
and which can may be replaced by
parts locally available in Thailand.
It makes not much sense to import
PVC water pipes from Germany.
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