Paper Technology International 2024 - Journal - Page 59
PAPERTECHNOLOGYINTERNATIONAL
Figure 2: Temperature ranges for different refrigerant with Turbo compressor.
Absorption cooling for sustainable waste water cooling
Other innovative way that has been less explored is to
cool the waste water with Absorption cooling, which utilizes heat
as the energy needed for the cooling. In absorption process the
electrical power needed in a normal mechanical cooling is replaced
by utilizing heat energy. If there is waste heat available during the
times the waste water is too warm, absorber can utilize that waste
heat to cool down the waste water sustainably. Mostly this would
happen in summer when there is too much heat energy in the mill,
and there are no applications for heating. This can also be seen as
heat recovery, when otherwise wasted energy 昀氀ows will be utilized
for a bene昀椀cial use.
Absorption cooling needs a hot medium, which can be either
water or steam. With our low temperature absorption line, water from
70°C and above can be utilized for the absorption cooling process.
Absorption cooling consists of three different circulations.
One being the chilled water circulation, one being the heat energy
circulation and the third one being the condensation circulation that
rejects the heat from the two other circulations to bring it away from
the cooled process.
Heat pumps applied in the context of Cooling Waste Water:
Heat pumps offer an energy-ef昀椀cient means of cooling
waste water to comply with regulatory requirements. By extracting
heat from the waste water and releasing it into the environment
at a lower temperature, the company ensures that the discharged
water meets or exceeds regulatory standards. This not only
addresses environmental concerns but also positions paper mills as
responsible users of natural resources while reducing the costs.
Figure 3: Three circulations for the absorber.
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