The PhD operates on the same principle as an air conditioner or
dehumidifier. Moist, warm air from the pool room is drawn
through the PhD where it is cooled to condense the water vapor.
The heat removed from the air is then raised to a higher temperature
by the action of an electrically driven compressor. This higher
temperature heat can now be readily transferred via a heat exchanger
to heat either the pool water or the air returned to the pool enclosure.
The technology is simple, reliable, and proven.
There are four series of PhD's - "H" Series, "S"
Series, AhD Series and HDCP. The "H" Series offers
a unique heat pipe heat exchanger recovers a large part of the heat
from the exhaust air to heat the incoming fresh air providing even
more savings. The "S" Series is a lower cost version
of the regular PhD-H, having only one blower and no heat pipe heat
exchanger. A larger size compressor is used in order to obtain
the same amount of dehumidification as the equivalent PhD with the
heat pipe heat exchanger, consequently the operating costs are somewhat
higher. The AhD is basically identical to the PhD-S.
The only difference is that the AhD provides dehumidification only
and no pool water heating.
The High Dehumidification Control Package, HDCP, is a two-stage
integrated package which works in high humidity or activity conditions
like therapeutical swimming pools or school, college and recreational
swimming pools. Due to the flexibility of two stages, the
HDCP has a high energy efficiency being controlled by a microprocessor
which brings the second stage only when the high humidity conditions
are encountered. The HDCP does not have a built-in heat pipe
heat exchanger, but an external air-to-air heat exchanger module
is available to be used with an external economizer to heat the
incoming fresh air and providing more savings. All models
have the optional built-in economizer and the optional remote coil
providing cooling upon demand. Dehumidification ratio ranges
from 44 to 142 lbs/hr depending on unit model.
The E-Tech WWHP Water-to-Water Heat Pump is a refrigeration machine
which efficiently extracts heat from a water source such as a well,
lake, earth loop, or closed loop and transfers this heat after raising
its temperature to heat another flow of water to temperatures up
to 150degree F. The amount of heat added to the hot water
output is greater than the amount taken from the source since the
electric energy supplied to the compressor is added to the output.
The WW Series ranges in size for water heating capacities from
30,000 BTUH to 820,000 BTUH.