9  The second heat exchanger HXfr  is included in the diagram to show that solar energy from the facade mix side of the Distribution Control may be used via HXfr to warm the room or the warm water storage tank Msw at the same time as some facades are cooling the cool water storage Msc. via Hxf.

10  The switching of the various valves is the result of solving on a digital computer groups of logical condition equations the input constants of which are values taken from the various sensors in the system, expected weather data, actual weather etc. a simple matter for today's PC's.
Frederick B. McKee

Strength and durability
Tests relating to strength and durability have been successful and a number of large units have been working since 1993 and a light weight plastics unit since 1982.

Hydrostatic Pressure

Concern regarding hydrostatic pressure has been expressed, even by engineers, the effects of  hydrostatic pressure are quite insignificant compared with the strengths of the components of the FG unit. Fluidized Glazing (FG) is designed to work floor by floor and the working pressures are in fact negative NOT positive, (i.e. the Torricellian principle) leeks if any tend to be into the system rather than out of it.
Positive hydrostatic pressure is only experienced upon filling the system when the fluid is pumped into it and its maximum is quite insignificant producing forces that are only 3% of the bond strength force.