New Energy Technologies Magazine nr 3 2005.pdf - Index of

As it follows from the last expression, in the
event that C B
= C B1
, in order to obtain boiling
water at the outlet of the heater, it is necessary
to get the initial temperature of the water
subjected to the mechanoactivation of about
T 1
= 66.5C. This coincides with the results
given in [3], [4], [5].
Thus, the described heat effects allow obtaining
a rather considerable additional heat generation
Q exc
in the generator’s work chamber.
However, the very fact of presence of additional
heat Q exc
does not mean that it can be used for a
considerable increase of the generator’s heat
productivity.
In order to make sure of this, let us consider
two contours of hydro-dynamic generators’
operation: the first contour is with a closed
circuit of the actuating body’s circulation and
the second one is with an open circuit.
In the first contour, heat generation Q exc
during
the water change from the stable lowtemperature
state to the metastable hightemperature
one happens without a change of
total energy content of a system
“heatgenerator – circuit”. During this, a heat,
which was temporarily produced in the contour
by the water in the phase change, will be
absorbed again within the limits of the same
contour by the water, which spontaneously
returns in its initial low-temperature state after
the relaxation time has passed.
It is obvious that, in this case, the heat, which
was first produced and then absorbed, is a kind
of virtual heat and cannot change the
generator’s productivity in such a way that its
efficiency exceeds one.
The operation of the heatgenerator with the
closed contour is explained on Fig. 5.
The countour of the actuating body of
heatgenerator 1 circulation consists of force
electric pump 2 and heat exchanger 3 connected
by hydro-pipes.
Using the pump, a water with temperature T 1
is led to the inlet of the heatgenerator, heated
there up to temperature T 2
, and led to the heat
exchanger where it is cooled up to temperature
T 1
, and then it is led to the inlet of the
heatgenerator again through the pump.
A heating efficiency of the generator during
time τ, as a rule, is determined by temperature
drop ∆Т = Т 2
– Т 1
in the heat exchanger and
water consumption G in the contour:
Q = k ∆Т G τ (5),
where k is an aspect ratio.
The efficiency of the heatgenerator’s operation,
excluding heat diffusion in the hydro-pipes and
elements 1 and 2 of the contour, is evaluated by
ratio
η = Q / U, (6)
where U is an electric energy consumed by the
pump during time τ.
However, evaluation (6) can be reliable just
in the event when all heat Q produced by the
generator is led to the environment, for
example, to the consumer.
Actually, as it follows from (3), heat Q is a sum
of two components: the first, Q exc
, is caused by
the exothermic water change while the second,
finally, is obtained by electric energy
transformation U into heat ∆Q, which is
equivalent to it. Durng continuous heat
production of the generator, the consumer can
obtain only a part of the heat, which is obtained
via heat excange, i.e. it is possible to get heat
∆Q, and always ∆Q U.
Another part of heat Q, heat Q exc
, is caused by a
temporary heat production because, on the
expiry of relaxation time τ r
, this part of the heat
is absorbed by the water again and is unavailable
for the consumer.
Hence, temperature drop ∆T in the heat
exchanger cannot be used as a representative
informative parameter for the evaluation of
the heatgenerator’s efficiency according to
the diagram on Fig. 5.
The mentioned drop is caused by two reasons: first,
by the water cooling during the heat emission and,
36 New Energy Technologies #3(22) 2005