Free heating, temperature conditioning at half price - Reisner AG

production of the cold water is operating in any case and the waste heat is therefore
available at no extra expense.
Ventilation units distribute the
heat to where it is needed.
They can be adapted to
specific room conditions.
However, the standard technologies for heat recovery used in the past do not fully exhaust
the potentials for saving. Some of the valuable energy is lost. Therefore, only heating water
with a relatively low temperature can be supplied. This represents a limitation in the heating
of the plant. The low-temperature heating water can only be used for air duct and floor
heating systems. If older heating radiators in offices and halls are used for heating to a
comfortable temperature, the temperature of the water has to be much higher. In order to reuse
energy directly in production and to generate heat by reusing waste heat, an even hotter
heating medium is necessary. This application is especially attractive, because temperature
conditioning units normally are operated directly with electricity and only one kWh of heat can
be generated for each kWh of electricity.
An effective cost-benefit ratio
In the continued development of its heat recovery concept, an important focus for Reisner
AG was that the water provided by the systems has to be as hot as possible. This can result
in problems with efficiency, depending on the desired temperature: the system may have to
achieve a higher condensation temperature. Consequently, the compressor requires more
electric power. Therefore, not only the potential benefit of the heat recovery increases, but
also the expense for achieving it – and this ratio has to be considered for each individual
solution.
The method applied by Reisner AG is based on the perfect control of all thermodynamic
processes in the system. This makes it possible to minimize losses and to utilize nearly one
hundred percent of the waste heat. High heating medium temperatures can also be achieved
without necessarily having to increase the condensation temperature. This limits the power
consumption of the cooling system. A key technical concept is the central bundling of the
waste heat stream. This is achieved by installing a heating circuit that circulates through the
condenser and collects all of the waste heat. If not all of the heat is needed – for example, if
it is to be used for heating purposes and the outside temperature is high enough that no
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