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===ASHREA PVT=== | ===ASHREA PVT=== | ||
The ASHREA Standard is licienced and is lengthy but straight forward. Get yourself a copy to read. | The ASHREA Standard is licienced and is lengthy but straight forward. Get yourself a copy to read. Copies cost money and are copyrighted, so it might not be the easiest thing to find one. For Queen's students, Professor Steve Harrison has a number of copies for his students and for the lab which he lends out to interested individuals who actually have a purpose for reading the standard. | ||
Here are some tips / requirements / suggestions for completing the test. | Here are some tips / requirements / suggestions for completing the test. | ||
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* Starting setting up at 9am since the testing period is between 10am-2pm. | * Starting setting up at 9am since the testing period is between 10am-2pm. | ||
* Plan for the unexpected since there | * Plan for the unexpected since there may be leaks or missing equipment. | ||
* The irradiance needs to be 790W/m^2 and with no clouds. Use a pyranometer to determine the irradiance. Make sure that it is calibrated. | * The direct irradiance needs to be 790W/m^2 and with no clouds. Use a pyranometer to determine the irradiance. Make sure that it is calibrated. If you have a global pyranometer, you can determine direct irradiance by subtracting diffuse minus global. At queen's, diffuse irradiation can be found from PI servers. | ||
* There needs to be a wind speed of 2.2-4.5 m/s. Find a fan if you don't have the constant wind speed. Use an anemometer to help determine the wind speed. | * There needs to be a wind speed of 2.2-4.5 m/s. Find a fan if you don't have the constant wind speed. Use an anemometer to help determine the wind speed. Make sure the fan generates uniform wind speed along the plane of the collector (ie. no angles or wakes at far end of collectors). | ||
* Calibrate your pump every time you want to start an experiment. This is because the flowrate/voltage varies every time you set up the experiment ( a result of changing air leakage/ system fluid resistance). | |||
* Be flexible as this test is weather dependant. | * Be flexible as this test is weather dependant. | ||
* Wait 15-20 minutes everytime you change a parameter. This is required for the system to stabilize as determined by the standard. | |||
* Determine your IV curve for the PV before you set up the thermal experiment. | |||
Revision as of 15:00, 16 September 2010
ASHREA PVT
The ASHREA Standard is licienced and is lengthy but straight forward. Get yourself a copy to read. Copies cost money and are copyrighted, so it might not be the easiest thing to find one. For Queen's students, Professor Steve Harrison has a number of copies for his students and for the lab which he lends out to interested individuals who actually have a purpose for reading the standard.
Here are some tips / requirements / suggestions for completing the test.
- Starting setting up at 9am since the testing period is between 10am-2pm.
- Plan for the unexpected since there may be leaks or missing equipment.
- The direct irradiance needs to be 790W/m^2 and with no clouds. Use a pyranometer to determine the irradiance. Make sure that it is calibrated. If you have a global pyranometer, you can determine direct irradiance by subtracting diffuse minus global. At queen's, diffuse irradiation can be found from PI servers.
- There needs to be a wind speed of 2.2-4.5 m/s. Find a fan if you don't have the constant wind speed. Use an anemometer to help determine the wind speed. Make sure the fan generates uniform wind speed along the plane of the collector (ie. no angles or wakes at far end of collectors).
- Calibrate your pump every time you want to start an experiment. This is because the flowrate/voltage varies every time you set up the experiment ( a result of changing air leakage/ system fluid resistance).
- Be flexible as this test is weather dependant.
- Wait 15-20 minutes everytime you change a parameter. This is required for the system to stabilize as determined by the standard.
- Determine your IV curve for the PV before you set up the thermal experiment.