IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… 3 Control Strategy The installation control is realized by the internal controller of the Sonnenkilma chiller. Indeed, this chiller goes with its internal regulation. This controller can be remotely programmed via an internet access and a VPN. The control strategy is as follows: The solar loop’s pump starts when the solar radiation reaches a certain value. So the hot storage starts warming up. Then, when the temperature at the top of the hot tank reaches a certain value (75°C), the three pumps of the chiller starts running (generator, evaporator, and condenser). And the cold production begins. Of course, several setpoint and thresholds were established to stop the installation in case of problems or at the end of the day. As it was explained in the previous paragraph, the system was designed to be as simple as possible. And it is the same principle for the control strategy. 4 Monitoring Equipment 4.1 Installed Equipment The measured data are basically the energy flow for every loop of the installation. As a consequence, at least two temperature measurement and one flowrate measurement are taken for each loop of the installation. The solar radiation and the overall electricity consumption of the installation are also measured. The Task 38 standard monitoring scheme below shows the different energies monitored: Task 38 standard monitoring scheme for the Maclas installation
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Going deeply into the details, the monitored data are: VARIABLE EXPLICIT MEANING UNIT Zeit Date and time V_G Flow in the generator piping m³/h*100 V_E Flow in the evaporator piping m³/h*100 V_AC Flow in the absorber/condenser piping m³/h*100 E_TS Solar Irradiation W/m² V_K Flow in the collectors piping m³/h*100 t_Gh “temperature generator hot” = temperature at the entry of the generator °C*10 t_Gc “temperature generator cold” = temperature at the exit of the generator °C*10 t_Ec “temperature evaporator cold” = temperature at the exit of the evaporator °C*10 t_Eh “temperature evaporator hot” = temperature at the entry of the evaporator °C*10 t_ACc t_ACh “temperature absorber/condenser cold” = temperature at the entry of the absorber “temperature absorber/condenser hot” = temperature at the exit of the condenser °C*10 °C*10 Q_G Energy used by the generator kW*100 Q_E Energy accumulated at the evaporator kW*100 Q_AC Energy given at the absorber/condenser kW*100 COP Coefficient of performance none*100 Q_Ballon_out Heating Power in winter operation kW*100 t_Koll “temperature collectors” = where is it taken exactly? You have to check at site, as far as I know directly in the collector °C*10 t_Kh primary circuit solar coming from field °C*10 t_Kc primary circuit solar going to field °C*10 t_sp11 Upper storage temperature °C*10 t_sp12 Lower storage temperature °C*10 t_stout Storage outlet temperature (to SAC=Solar absorption chiller) °C*10 t_stin Storage input temperature (coming from SAC) °C* 10 Q_Solar Power Solar Circuit kW*100 t_room_AKA Temperature inside control unit °C*10 Setpoint_Ec Cold Water Setpoint °C*10
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<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 />
3 Control Str<strong>at</strong>egy<br />
The install<strong>at</strong>ion control is realized by the internal controller of the Sonnenkilma chiller.<br />
Indeed, this chiller goes with its internal regul<strong>at</strong>ion. This controller can be remotely<br />
programmed via an internet access <strong>and</strong> a VPN.<br />
The control str<strong>at</strong>egy is as follows:<br />
The solar loop’s pump starts when the solar radi<strong>at</strong>ion reaches a certain value. So the hot<br />
storage starts warming up.<br />
Then, when the temper<strong>at</strong>ure <strong>at</strong> the top of the hot tank reaches a certain value (75°C), the<br />
three pumps of the chiller starts running (gener<strong>at</strong>or, evapor<strong>at</strong>or, <strong>and</strong> condenser). And the<br />
cold production begins.<br />
Of course, several setpoint <strong>and</strong> thresholds were established to stop the install<strong>at</strong>ion in case of<br />
problems or <strong>at</strong> the end of the day.<br />
As it was explained in the previous paragraph, the system was designed to be as simple as<br />
possible. And it is the same principle for the control str<strong>at</strong>egy.<br />
4 Monitoring Equipment<br />
4.1 Installed Equipment<br />
The measured d<strong>at</strong>a are basically the energy flow for every loop of the install<strong>at</strong>ion. As a<br />
consequence, <strong>at</strong> least two temper<strong>at</strong>ure measurement <strong>and</strong> one flowr<strong>at</strong>e measurement are<br />
taken for each loop of the install<strong>at</strong>ion.<br />
The solar radi<strong>at</strong>ion <strong>and</strong> the overall electricity consumption of the install<strong>at</strong>ion are also<br />
measured.<br />
The Task 38 st<strong>and</strong>ard monitoring scheme below shows the different energies monitored:<br />
Task 38 st<strong>and</strong>ard monitoring scheme for the Maclas install<strong>at</strong>ion
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