IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

nachhaltigwirtschaften.at
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04.11.2013 Views

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… During the heating season, the latent heat storage buffers the solar surplus heat and balances the heat supply to the consumer by boosting the return temperature of the heating system (see Figure 2). Thus, a low operating temperature of the solar thermal system is accomplished yielding efficient operation with optimum solar gain. SOLAR HEATING directly solar loading latent heat storage loading hot water tank 32°C 25°C Buffering solar surplus heat CHILLER 45 – 90°C HEATING / LATENT COOLING HEAT SYSTEM STORAGE HOT WATER TANK AUX. BOILER DRY AIR COOLER SOLAR SYSTEM 25 - 45°C SOLAR HEATING preheating by latent heat storage unloading hot water tank Boosting the return temperature CHILLER HOT WATER TANK AUX. BOILER DRY AIR COOLER 32°C 27°C SOLAR SYSTEM 25°C HEATING / LATENT COOLING HEAT SYSTEM STORAGE Fig. 2. System scheme for solar heating with latent heat storage Simplified system configurations for cooling and heating operation are given in Figure1 and Figure 2. The realised piping and instrumentation is given in Figure 3. This kind of installation facilitates a very flexible and efficient use of solar energy in existing buildings with heating and cooling systems operating at moderate heating and chilled water temperatures. - Conventional design of the solar thermal system with primary loop in water/glycol and a secondary loop connected to the heating system, the hot water tank, and the generator of the absorption chiller via the high temperature (HT) heat distributor. - The dry air-cooler and the latent heat storage are integrated into a secondary loop, linked to the heating system by the plate heat exchangers WT 4-2. A set of valves is applied for switching between the different operating modes in summer and winter, enabling for boosting the temperature of the return flow of the activated ceilings, the loading and unloading of the latent heat storage, and the emergency cooling of the solar thermal system during summer operation. The latent heat storage had to be integrated in the secondary reject heat loop due to safety reasons and simplified unloading by the dry air cooler in cooling mode. In further installations also the chiller’s absorber and condenser should be integrated into this water/glycol loop to avoid a temperature increase of the cooling water due to the heat transfer in the plate heat exchanger. Furthermore an increase of the electrical COP could be achieved. - During the heating season low (NT) and high temperature (HT) distributor are connected to each other. - A ground water well linked to the NT distributor and a pellet boiler linked to the HT distributor serve for backup in cooling and heating mode, respectively.

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Fig. 3. Hydraulic scheme for the solar heating and cooling system with latent heat storage

<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion<br />

Subtask A Report, D<strong>at</strong>e:…<br />

Fig. 3. Hydraulic scheme for the solar he<strong>at</strong>ing <strong>and</strong> cooling system with l<strong>at</strong>ent he<strong>at</strong> storage

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