Heating and Cooling
Introduction
In aquaculture heating of the water may be necessary for
several reasons, for example to increase the growth rate, to get the fish reach
a specific size at a certain time, to get them to mature or to spawn.
Different species have different optimal temperatures; if the ambient water
temperature is cooler than the optimal temperature, it can be useful to heat
the water.
The principles used for heating in aquaculture are
normally the same as those used in houses or industrial facilities; however,
systems used in aqua-culture facilities must heat large amounts of water and
therefore be efficient. Important factors when choosing a system are the total
heating requirements and the necessary temperature increase. In this chapter a
survey of methods and equipment is given. It starts with some basic physical
laws and ends with some simple specifications and calculated examples.
Instead of purchasing all the heat necessary, it could be
taken from other available sources, such as geothermic water, or the water
could be re-used. For species needing much warmer water than is avail-able from
source, both these methods could be used.
In some cases it is necessary to chill the water, for
instance in connection with storing the brood stock, to get the fish to mature,
and for storing eggs and fry. Heating and chilling both involve energy
transfer. When heating water, energy is added to the system, while chilling
removes energy from the system. In this chapter the focus is on heating systems
used for aquaculture; much of the basic information applies to both heating and
cooling. A great deal of general engineering literature is avail-able on this
subject and also on basic thermodynamics; .
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