- Collector peak efficiency is only achieved when ambient temperature and water temperatures are the same. During normal use, this is only likely to happen for a short period of time each day, and usually only when ambient temperatures are high (summer). Therefore during normal use, the solar collector can not always perform at such a high level of efficiency. This is true for all vacuum tube collectors, not only JinYi solar collectors. In order to provide more realistic figures, the above calculations are based on "normal" operating conditions under which the difference between ambient temp and manifold water temp is around 30-40oC.
- When making comparisons with other products
please take the above point into consideration. Do not simply
use the peak efficiency values for energy output, as this
will provide inflated figures. IAM values also play an important
role in determining total energy output from a solar collector.
- Monthly and annual values are calculated using 28 days
and 336 days respectively to account for days of very low
- Energy output values are approximations. Actual energy
output and overall system efficiency will depend upon installation
location, climate, insulation, system configuration and
many other factors. On rainy or heavily overcast days energy
output will be greatly reduced.
- Energy is produced in the form of heat. In transporting
and converting this energy, such as for air conditioning
or central heating, some energy (heat) will be lost, as
no system or insulation is 100% efficient.