The /-chart of Figure 11.2 has been generated using a collector antifreeze solution flow rate equal to 0.015 L/s-m2. A lower flow rate can reduce the energy collection rate significantly, especially if the low flow rate leads to fluid boiling and relief of pressure through the relief valve. Although the product of the mass flow rate and the specific heat of the fluid flowing through the collector strongly affects the performance of the solar energy system, the value used is seldom lower than the value used for the f-chart development. Additionally, since an increase in the collector flow rate beyond the nominal value has a small effect on the system performance, Figure 11.2 is applicable for all practical collector flow rates.
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Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.