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:… Fan coil Initial heat rejection system Geothermal heat rejection system (2009) 3 Control Strategy The solar pump of the system starts to work when the temperature of the solar field is around 86ºC, in this moment the water circulates in the primary loop. The secondary pump, which supplies thermal energy to the absorption chiller, is activated when the solar heat exchange temperature on this secondary side is over 80ºC. The monitoring system is configured so that the absorption machine is turned on when the inlet temperature of the generator is 80ºC. It has to be noticed that the installation contains a hot water storage tank and an auxiliary boiler as the back-up system. The aim of the hot water tank is to store the solar energy in those periods without cooling demand. And the mission of the gas boilers is to supply thermal energy to the absorption chiller when the solar energy isn’t enough to produce chilled water. However, both devices have never been used. On the one hand the gymnasium always demands cooling demand when there is enough solar energy to activate the chiller, so it isn’t necessary a buffer to store the heat water. On the other hand the installation is focused on the chiller performance when the chiller is only solar powered. 4 Monitoring Equipment 4.1 Installed Equipment The installation is completely monitored. The monitoring system was designed perform the energy balances of the different components of the installation. There are a PLC unit and a web controller, which form the controlling and recording system. In this way, the outdoor and indoor conditions of the installation are well defined. The monitoring system consists mainly of two temperature probes (near to the absorber and the condenser of the absorption machine) which measure the inlet and outlet temperature of the flow between the absorption chiller and the dry cooling tower (finned tube heat exchanger). Two temperature probes measure the inlet and outlet temperature of the flow between the absorption chiller and the fan coils (the measure is taken near the evaporator in the absorption machine). Two temperature probes measure the inlet and outlet temperature of the flow between the absorption chiller and the heat exchanger (the measure is taken near to the generator in the absorption machine). While the temperature values for the exterior temperature are measured with NTC sensors, the ones located around the absorption chiller are registered with PTC sensors. Furthermore, there is a flow meter in each one of the circuits of the chiller; the water flow that goes to the generator, the water flow that goes to the fan coils and the water flow that goes to the finned tube heat exchanger. In figure 2 it can be seen the location of probe of the monitoring system.
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… Fig. 2. – Monitoring Equipment In Table 1 the features of the main sensors of the monitoring system are shown. DEVICE MEASUREMENT UNITS COMMERCIAL MODEL RANGE ACCURANCY SC-01 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5% SC-02 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5% SC-03 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5% SC-04 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5% SC-05 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5% SC-06 Temperature °C SIEMENS Ultraheat 2WR5(NTC) +2ºC;+1 80ºC Máx. ±1,5% SE-01 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-02 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-03 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-04 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-05 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-06 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-07 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-08 Temperature °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º% SE-09 Temperature °C SIEMENS QFA 3160 0ºC;+50ºC ±0,8ºC (from 15ºC to 30ºC); ±1ºC (0ºC a 15ºC; 30ºC a 50ºC) SE-10 Temperature °C SIEMENS QAC22 -35ºC;+50ºC ±0,05ºC in 0ºC (DIN 43760) SE-11 Flowmeter m 3 /h SIEMENS Ultraheat 2WR5 15l/h-3m 3 /h Máx. ±4% SE-12 Flowmeter m 3 /h SIEMENS Ultraheat 2WR5 15l/h-3m 3 /h Máx. 4%. SE-13 Flowmeter m 3 /h SIEMENS Ultraheat 2WR5 15l/h-3m 3 /h Máx. ± 4% SE-14 Solar Radiation W/m 2 QUIMISUR IQ-5.0 0-2000W/m 2 ±2% SE-15 Relative Humidity %HR SIEMENS QFA 3160 0-100% h.r. ±2%h.r. SE-16 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-17 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-18 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-19 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-20 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-21 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-22 Temperature °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º% SE-23 Temperature °C SIEMENS QAC22 -35ºC;+50ºC ±0,05ºC en 0ºC (DIN 43760) Table 1.- Features of the installed equipment 4.2 Period of Measurement The solar cooling system has been measured from June to September since 2007.
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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 />
Fig. 2. – Monitoring Equipment<br />
In Table 1 the fe<strong>at</strong>ures of the main sensors of the monitoring system are shown.<br />
DEVICE MEASUREMENT UNITS COMMERCIAL MODEL RANGE ACCURANCY<br />
SC-01 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5%<br />
SC-02 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5%<br />
SC-03 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5%<br />
SC-04 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5%<br />
SC-05 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+18 0ºC Máx. ±1,5%<br />
SC-06 Temper<strong>at</strong>ure °C SIEMENS Ultrahe<strong>at</strong> 2WR5(NTC) +2ºC;+1 80ºC Máx. ±1,5%<br />
SE-01 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-02 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-03 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-04 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-05 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-06 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-07 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-08 Temper<strong>at</strong>ure °C SIEMENS QAD22 -30ºC;+130ºC Máx. ±0,8 º%<br />
SE-09 Temper<strong>at</strong>ure °C SIEMENS QFA 3160 0ºC;+50ºC<br />
±0,8ºC (from 15ºC to 30ºC);<br />
±1ºC (0ºC a 15ºC; 30ºC a 50ºC)<br />
SE-10 Temper<strong>at</strong>ure °C SIEMENS QAC22 -35ºC;+50ºC ±0,05ºC in 0ºC (DIN 43760)<br />
SE-11 Flowmeter m 3 /h SIEMENS Ultrahe<strong>at</strong> 2WR5 15l/h-3m 3 /h Máx. ±4%<br />
SE-12 Flowmeter m 3 /h SIEMENS Ultrahe<strong>at</strong> 2WR5 15l/h-3m 3 /h Máx. 4%.<br />
SE-13 Flowmeter m 3 /h SIEMENS Ultrahe<strong>at</strong> 2WR5 15l/h-3m 3 /h Máx. ± 4%<br />
SE-14 <strong>Solar</strong> Radi<strong>at</strong>ion W/m 2 QUIMISUR IQ-5.0 0-2000W/m 2 ±2%<br />
SE-15 Rel<strong>at</strong>ive Humidity %HR SIEMENS QFA 3160 0-100% h.r. ±2%h.r.<br />
SE-16 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-17 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-18 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-19 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-20 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-21 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-22 Temper<strong>at</strong>ure °C SIEMENS QAE2120.010 -30ºC;+130ºC Máx . ±0,8º%<br />
SE-23 Temper<strong>at</strong>ure °C SIEMENS QAC22 -35ºC;+50ºC ±0,05ºC en 0ºC (DIN 43760)<br />
Table 1.- Fe<strong>at</strong>ures of the installed equipment<br />
4.2 Period of Measurement<br />
The solar cooling system has been measured from June to September since 2007.
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