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Figure 18- adsorption and desorption modes The desorption energy QDes is the energy input to the thermochemical storage system, whereas the heat of adsorption energy QAds can be used for heating. The heat of condensation QCond can be additionally used, if it is available on a usable temperature level, which is depending on the inlet air conditions. The energy for evaporation QEvap has to be available at a low temperature level, which can not be used otherwise. The desiccant cooling process is based on the dehumidification of the air during the adsorption mode only. Thermal energy storage is achieved by separating the desorption step (charging mode) from the adsorption step (discharging mode). After desorption the adsorbent can theoretically stay in this desorbed state, being referred to as charged in the following, without any thermal losses until the adsorption process is activated. Heating: In order to reach a coefficient of performance COP heat of about 1.0 or more it is important to utilize the heat of condensation Qcond during the charging process. The thermochemical storage system can be charged off-peak. At on-peak times it uses only low temperature heat extracted from the return flow of the district heating system. By lowering the temperature of this return flow, the power transported is increased and heat losses of the net are reduced. In addition to that, thermochemical storage systems offer high energy storage densities without degradation due to heat losses in long term storage. Figure 19 shows heat fluxes during charging and discharging mode. At night Zeolite is charged by air, heated up to about 130 °C - 180 °C using the steam line of the district heating system (heat of desorption QDes). Under these conditions the final water content of the Zeolite reaches 0.09 kgWater/ kgZeolite – 0.05 kgWater/kgZeolite. 21PDF Image | Thermochemical Heat Pump
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