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 Experience report summer 2009 The monitoring of the first cooling season showed that the adsorption chiller worked reliable and the desired air-conditioning of the office rooms was given. The room temperature in the offices was kept under 24°C over the whole summer. There weren`t any error operations in the overall system or in the individual components. The average cooling capacity of the system lay between 1,7 kW and 2,4 kW, which is way below the nominal capacity of 7,5 kW of the adsorption chiller. This part load operation caused by the low cooling capacity on the building side has a negative impact on the thermal Coefficient of Performance (COP th ) as well as on the electrical Coefficient of Performance (COP el ) of the solar adsorption chiller system. The documentation of the control was incomplete, which made the check of the implemented control strategies in the plant through monitoring evaluation quite difficult. In July 2009, the cold water pump showed a varying electricity consumption. The comparison between the electricity consumption of the pump and the mass flow in the cold water circle showed that there was an electricity consumption of the pump, even when the mass flow was zero. This led to the conclusion that air was in the cold water pipes. Therefore, the water pipes were de-aired which affected the desired continuous mass flow. The energy performance of the system is evaluated by two indicators. The Thermal Coefficient of Performance (COP th ) gives the ratio between produced cooling energy and used thermal driving energy for a certain period of time (see Equation 1). Thermal Coefficient of Performance: COP Gains Qcooling[ kWh] Thermal _ Demand Q _ [ kWh] = Equation 1 th = solar thermal The Electrical Coefficient of Performance gives the ratio between the produced cooling energy and the used electrical consumption for a certain period of time (see Equation 2). Electrical Coefficient of Performance: COP Gains Qcooling[ kWh] Electricity _ Demand E , [ kWh] = Equation 2 el = drivingel
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Figure 3 shows that the daily COP th for August 2009 are in the range between 0,19 to 0,35. On the days with grey bares the recording of monitoring data was insufficient. Figure 4 shows that the daily COP el are in a range between 0,2 and 2,3 in August 2009. The low COP el are mainly caused by the low cooling capacity needed in the offices. The adsorption chiller operated nearly all the time in a very low part load, but the three pumps around the adsorption chiller and the heat rejection were operating in full load.
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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 />
<br />
Figure 3 shows th<strong>at</strong> the daily COP th for August 2009 are in the range between 0,19 to 0,35.<br />
On the days with grey bares the recording of monitoring d<strong>at</strong>a was insufficient.<br />
<br />
Figure 4 shows th<strong>at</strong> the daily COP el are in a range between 0,2 <strong>and</strong> 2,3 in August 2009. The<br />
low COP el are mainly caused by the low cooling capacity needed in the offices. The<br />
adsorption chiller oper<strong>at</strong>ed nearly all the time in a very low part load, but the three pumps<br />
around the adsorption chiller <strong>and</strong> the he<strong>at</strong> rejection were oper<strong>at</strong>ing in full load.
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