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A strong team |
Buderus introduces a new hybrid system based on split technology – the new Logatherm WPLSH integrates an EMS boiler and an air/water heat pump with a single control system.
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Heat pump systems have been established in new buildings and modernisation for many years now. At ISH 2011, Buderus, a Bosch Thermotechnology brand, will show the new hybrid system Logatherm WPLSH for the first time – the combination of an air/water heat pump featuring split technology with an EMS heat generator controlled through a Logamatic EMS (energy management system) control system. Bivalent systems including air/water heat pumps have become an efficient and ecologically viable alternative particularly in existing buildings. However, the success depends to a great extent on the optimum coordination of the individual components and of the functionality and “intelligence” of the controller.
In conventional heat pumps, the closed refrigeration circle is located in a case within the heat pump. Air/water heat pumps for outdoor use featuring inverter or split technology consist of an outdoor and an indoor module. The outdoor module extracts the environmental energy from the air and raises it to a higher temperature level in the closed refrigeration circuit. Through the condenser, the energy in the interior module is transferred to the heating system. In the outdoor part, there is an evaporator which is connected to the indoor condenser via a refrigerant line. In contrast to conventional air/water heat pumps, the split technology adapts the compressor speed and the ventilator levels to the individual heat requirement.
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One of the components of the Buderus hybrid system Logatherm WPLSH is the outdoor module of the air/water heat pump, which extracts the environmental energy from the air. |
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New hybrid system Logatherm WPLSH
The new Buderus hybrid system Logatherm WPLSH is the combination of an EMS boiler with an air/water heat pump (7 kW nominal output) based on split technology. This hybrid system covers an output range up to 25 kW. The decisive difference to the bivalent systems known so far: the hybrid system is controlled by a single controlling system, namely Buderus Logamatic EMS controlling system with the control unit Logamatic RC35.
The indoor module is integrated through the return flow of the system. Usually, no buffer cylinder is required, which is another difference to other bivalent heat pump systems. The heat pump circuit therefore uses a cycle reversal for defrosting, drawing the required energy from the network of the heating system. If the energy in the heating system is not sufficient for defrosting, the EMS heat generator will support the process. If requested, a buffer cylinder may be installed which stores the energy from the heat pump as heating energy and provides it for defrosting when required. In this case, operation of the EMS heat generator is not necessary.
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The indoor unit Logatherm WHM combines the heat exchanger (condenser), the high-efficiency pump, the controlling module Logatherm HM as well as connections and distributors in order to integrate the heat pump in the heating system. |
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Controlling through a flexible balance point
Bivalent systems typically control the release of the conventional heat generator through a fixed balance point. In the Buderus hybrid system Logatherm WPLSH, the conventional heat generator is switched on via a flexible balance point. There are several controlling strategies: CO2-optimised or cost-optimised operation as well as setting a fixed balance point.
The new hybrid system Logatherm WPLSH consists of three major components: the conventional EMS boiler with the controlling system EMS and operating unit Logamatic RC35, the indoor unit, the hybrid manager Logatherm WHM and the outdoor unit.
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