STIEBEL ELTRON SOL 25 PLUS - Manual (Page 70)

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temperature than the other. In some cases thermo-siphoning
is undesirable when it causes heat to be transported away from
storage.
truss: a triangular-shaped structure used to tilt (incline) solar
collectors at an angle relative to the structure (inclination angle) on
which they are mounted.
Units of Measure:
BTU: British thermal unit
°C: degrees Celsius
°F: degrees Fahrenheit
ft: foot/feet of distance
k: Kelvin (degree of absolute temperature)
kg: kilogram
kN: kiloNewton (thousand Newtons) of force
lb: pound force or weight
m: meter
mm: millimeter
psi: pounds per square inch
psia: pounds per square inch, absolute
psig: pounds per square inch, gauge
W: watt
UV: ultraviolet radiation (typically a component sunlight).
venting: the process of purging air from the solar loop or other parts
of a heating system.
vertical collector mounting: a mounting arrangement in which the
long dimension of each collector is oriented up/down; the collector’s
pipe fittings (nipples) typically point upward.
wind loads: forces generated by winds impinging upon solar
collectors and related components.