The electrical performance of the PV modules can be severely affected by operating temperature of silicon cells due to properties of the crystalline silicon used; the energy generated from these cells decreases with their high temperatures. To reduce
this decline in energy, the PV modules use cooling water by placing a tube containing many regular holes on the top end of the module, and water flows on the surface freely in several flows. So, with flow rate (4.224 l/min.m2), module temperature decreases up to (20C°); the record of increased value of electrical yield over the whole day is about (12.8%). and efficiency rises (from 8.31% to 9.62%) of (1.31%). With Flow rate (3.167 l/min.m2), temperature of module decreases up to (18C°); the record of increased value of electrical yield is about (9.8%), and efficiency rises by (1.03%). But with flow rate (2.112 l/min.m2), temperature of module decreases up to (15.5C°); the record of increased value of electrical yield is about (7.8%), and efficiency rises by (0.83%). Furthermore, flow of water on the surface of PV module reduces the reflection losses because the refractive index of water with (1.3) is intermediate between air (1) and glass (1.5). In addition, the surface of module remains clean.
The research aims to optimize the investment in solar cooling process using two
models of vessels (clay- mineral).The study was conducted at the site of Tartous in the
month (the fourth - fifth - sixth) years (2013) and that the fruits of the tomat
o study, she
stated that the pottery is causing a drop in temperature between )4-6( degrees Celsius, and
that the metal causes the low temperature range between (3-5 ) degrees Celsius although
the fruits of tomatoes preserved pottery vessels have not undergone any damage of its
structure or texture during the period of conservation (27 days) compared to the control
which is exposed to damage during the (12 days) .
