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:… 3.2 Collector efficiency Basically the collector efficiency characterise the performances of the solar collector field. It is calculated as follows: With: coll Collector efficiency (-) Q sol G Solar energy collected in the solar loop (kWh) Solar radiation (kWh) This performance factor is calculated for a certain period. Usually it is calculated for one day, or for one month. Indirectly, the collector efficiency permits also to characterize the overall performances of the installation. Indeed, if the installation is turned off, because of a technical issue, or because there is no charge, the energy collected is equals to zero while the solar radiation is still there. So the collector efficiency value is low. 3.3 Thermal COP The thermal coefficient of performance (thermal COP) characterizes the internal performances of the chiller. This performance factor is calculated only in summer (cooling mode of the installation) as follows: With: Thermal COP Thermal coefficient of performance (-) Q evap Q gen Energy taken from the evaporator loop (kWh) Energy coming from the generator loop (kWh) Usually adsorption chillers have a thermal COP around 0.4 to 0.5 and absorption chillers have a thermal COP around 0.6 to 0.7. 3.4 Electrical COP The electrical coefficient of performance (electrical COP) characterizes the electric performances of the entire solar installation. This performance factor is calculated all year long as follows: With: Electrical COP Electrical coefficient of performance (-) Q distrib E tot Energy (hot or cold) given to the distribution loop (kWh) Electrical energy consumed by the solar system (except backups) (kWh)
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… This ratio is used to compare the performances of the installation to the performances of a conventional system such as heat pumps. 3.5 Primary Energy Ratio (PER) This performance factor characterizes the overall efficiency of the installation in terms of primary energy. It is the ratio between all the energies given to the user (heating, cooling, and DHW) and all the primary energies consumed by the system (including backups). The more this performance factor is high, the more the solar fraction is high and/or the overall efficiency of the installation is high. PER = E système Q10 + Q3 + Q4 Q2 Q8 ⋅εélec. + ⋅εX + ⋅εX Rg EER See the SOLERA deliverable No. D 6.1, or the Task38 deliverables for more explanation about the meanings of the different terms of the equation. 3.6 Fractional solar heating and cooling savings The global evaluation of the whole system was performed by using the fractional solar heating and cooling savings fsav,SHC as actually defined in the IEA-SHC Task 38. It describes the fraction of energy savings of the solar system compared to a conventional system that provides the same service for heating, cooling and domestic hot water demand. It is calculated as follows: See the SOLERA deliverable No. D 6.1 for more explanation about the meanings of the different terms of the equation.
- Page 229 and 230: IEA SHC Task 38 Solar Air Condition
- Page 231 and 232: IEA SHC Task 38 Solar Air Condition
- Page 233 and 234: IEA SHC Task 38 Solar Air Condition
- Page 235 and 236: IEA SHC Task 38 Solar Air Condition
- Page 237 and 238: IEA SHC Task 38 Solar Air Condition
- Page 239: IEA SHC Task 38 Solar Air Condition
- Page 242 and 243: IEA SHC Task 38 Solar Air Condition
- Page 244 and 245: IEA SHC Task 38 Solar Air Condition
- Page 246 and 247: IEA SHC Task 38 Solar Air Condition
- Page 248 and 249: IEA SHC Task 38 Solar Air Condition
- Page 250 and 251: IEA SHC Task 38 Solar Air Condition
- Page 252 and 253: IEA SHC Task 38 Solar Air Condition
- Page 254 and 255: IEA SHC Task 38 Solar Air Condition
- Page 256 and 257: IEA SHC Task 38 Solar Air Condition
- Page 258 and 259: IEA SHC Task 38 Solar Air Condition
- Page 260 and 261: Task 38 Solar Air-Conditioning and
- Page 262 and 263: - - - - - - - - - - -
- Page 264 and 265: - - - - - - - - - - -
- Page 266 and 267: Pompe évaporateur + compteur C3 Dr
- Page 268 and 269: 80 70 Temperature (°C) 60 50 40 3
- Page 270 and 271: Power (kW) 20 19 18 17 16 15 14 13
- Page 272 and 273: Power (kW) 20 19 18 17 16 15 14 13
- Page 274 and 275: Task 38 Solar Air-Conditioning and
- Page 276 and 277: IEA SHC Task 38 Solar Air Condition
- Page 278 and 279: IEA SHC Task 38 Solar Air Condition
- Page 282 and 283: IEA SHC Task 38 Solar Air Condition
- Page 284 and 285: IEA SHC Task 38 Solar Air Condition
- Page 286 and 287: IEA SHC Task 38 Solar Air Condition
- Page 288 and 289: IEA SHC Task 38 Solar Air Condition
- Page 290 and 291: IEA SHC Task 38 Solar Air Condition
- Page 292 and 293: IEA SHC Task 38 Solar Air Condition
- Page 294 and 295: IEA SHC Task 38 Solar Air Condition
- Page 296 and 297: IEA SHC Task 38 Solar Air Condition
- Page 298 and 299: IEA SHC Task 38 Solar Air Condition
- Page 300 and 301: Task 38 Solar Air-Conditioning and
- Page 302 and 303: IEA SHC Task 38 Solar Air Condition
- Page 304 and 305: IEA SHC Task 38 Solar Air Condition
- Page 306 and 307: IEA SHC Task 38 Solar Air Condition
- Page 308 and 309: IEA SHC Task 38 Solar Air Condition
- Page 310 and 311: IEA SHC Task 38 Solar Air Condition
- Page 312 and 313: IEA SHC Task 38 Solar Air Condition
- Page 314 and 315: IEA SHC Task 38 Solar Air Condition
- Page 316 and 317: IEA SHC Task 38 Solar Air Condition
- Page 318 and 319: IEA SHC Task 38 Solar Air Condition
- Page 320 and 321: IEA SHC Task 38 Solar Air Condition
- Page 322 and 323: IEA SHC Task 38 Solar Air Condition
- Page 324 and 325: IEA SHC Task 38 Solar Air Condition
- Page 326 and 327: IEA SHC Task 38 Solar Air Condition
- Page 328 and 329: Task 38 Solar Air-Conditioning and
<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 />
This r<strong>at</strong>io is used to compare the performances of the install<strong>at</strong>ion to the performances of a<br />
conventional system such as he<strong>at</strong> pumps.<br />
3.5 Primary Energy R<strong>at</strong>io (PER)<br />
This performance factor characterizes the overall efficiency of the install<strong>at</strong>ion in terms of<br />
primary energy. It is the r<strong>at</strong>io between all the energies given to the user (he<strong>at</strong>ing, cooling,<br />
<strong>and</strong> DHW) <strong>and</strong> all the primary energies consumed by the system (including backups).<br />
The more this performance factor is high, the more the solar fraction is high <strong>and</strong>/or the<br />
overall efficiency of the install<strong>at</strong>ion is high.<br />
PER =<br />
E<br />
système<br />
Q10<br />
+ Q3<br />
+ Q4<br />
Q2<br />
Q8<br />
⋅εélec.<br />
+ ⋅εX<br />
+ ⋅εX<br />
Rg EER<br />
See the SOLERA deliverable No. D 6.1, or the Task38 deliverables for more explan<strong>at</strong>ion<br />
about the meanings of the different terms of the equ<strong>at</strong>ion.<br />
3.6 Fractional solar he<strong>at</strong>ing <strong>and</strong> cooling savings<br />
The global evalu<strong>at</strong>ion of the whole system was performed by using the fractional solar<br />
he<strong>at</strong>ing <strong>and</strong> cooling savings fsav,SHC as actually defined in the <strong>IEA</strong>-SHC Task 38. It<br />
describes the fraction of energy savings of the solar system compared to a conventional<br />
system th<strong>at</strong> provides the same service for he<strong>at</strong>ing, cooling <strong>and</strong> domestic hot w<strong>at</strong>er dem<strong>and</strong>.<br />
It is calcul<strong>at</strong>ed as follows:<br />
See the SOLERA deliverable No. D 6.1 for more explan<strong>at</strong>ion about the meanings of the<br />
different terms of the equ<strong>at</strong>ion.
Change language