Stiebel-eltron SOL 25 PLUS Manuel d'utilisateur télécharger pdf (Page 69)

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(typically air or nitrogen) cushion on the “dry” side of an expansion

tank’s diaphragm. It helps to regulate the system pressure and must

be set according to the instructions.

pressure drop: the loss of pressure of a ﬂuid as it ﬂows through

pipes and other components, caused by its viscosity or “friction”.

Pressure drops must be taken into account when determining pump

sizes, system pressures, and other design factors.

proﬁle (frame) rails: extruded aluminum members that form the

frame in which to hold collectors and that provide slots for bolt

attachments.

propylene glycol: a non-toxic type of heat transfer medium and

anti-freeze solution that is often used in closed-loop solar collector

systems to prevent freezing of the liquid and related damage to

components in very cold temperatures. The correct percentage of

propylene glycol in a mixture with water is critical to the proper

functioning and safe operation of solar thermal systems.

psi (psia, psig): pounds (force) per square inch (typically for pressure

or stress measurement); psia is absolute pressure; psig is gauge

pressure. Sea-level atmospheric pressure is approximately 14.7 psia

– or 0 psig, as read by a gauge.

Purgomat air vent: an automatic, ﬂoat-type air vent that is used to

purge a hydronic system or solar loop of air and allow efﬁcient heat

transfer to take place.

PVC: polyvinyl chloride, a thermoplastic polymer. It is often used as

a jacket or cover for solar loop piping and other components.

refractometer: a device used to measure of an index of refraction.

For solar thermal systems, the index of refraction is translated to

degrees of freeze protection that an anti-freeze solution provides.

reheating: the addition of more heat to the outlet domestic hot water

of a solar storage tank to raise it to the desired temperature for ﬁnal

use by a building’s occupants.

RTD: resistance temperature detector or resistance thermometer, a

temperature sensor that exploits the predictable change in electrical

resistance of some materials with changing temperature. They

are most often made of platinum (‘Pt’ is the symbol for platinum).

Stiebel Eltron’s SOM 6, 7, and 8 use RTD temperature sensors to

measure temperatures of solar collectors, heat exchangers, and

storage tanks. RTDs are manufactured to achieve a particular

resistance curve vs. temperature.

R-value (insulation): a measure of thermal resistance used in the

building and construction industry. The bigger the number, the

better the insulation’s effectiveness. R-value is the reciprocal of

U-value. In the U.S., the units of measure of R-value are degrees

Fahrenheit, square feet hours per BTU, (ft²·°F·h/BTU). Converting

to/from SI units, 1 ft²·°F·h/BTU ≈ 0.1761t K·m²/W, or 1 K·m²/W ≈

5.67446 ft²·°F·h/BTU.

SBB: Stiebel Eltron solar storage tank models.

Schrader valve: most often found on tube-type and tubeless tires,

Schrader valves are used on many refrigeration and air conditioning

systems to allow servicing, including recharging with refrigerant.

They are also used to conduct leak-down pressure tests on pipe

installations. Stiebel Eltron expansion tanks are ﬁtted with Schrader

valves to permit easy charging with pressurized air or nitrogen.

sensor well: a cylindrical bore made in a component to allow

insertion of a cylindrical temperature sensor that is to measure the

component’s temperature. An external sensor well is integrated

with pipe ﬁttings to attach to the Stiebel Eltron SOL 25 PLUS solar

collector.

shear force: force acting perpendicular to a fastener or member

which would shear it off if sufﬁciently high (above the member’s or

fastener’s shear strength)

smooth-tube heat exchanger: a type of immersed-tube HX that does

not employ ﬁns to help conduct heat. Stiebel Eltron’s SBB storage

tanks employ smooth-tube heat exchangers.

solar loop: the ﬂuidic loop that closed-loop solar systems employ to

transport solar-heated liquid from solar collectors to solar storage

tanks and/or other devices. The loop may also be used to shed heat

if temperatures in the system exceed safe limits.

SOLKIT: Stiebel Eltron solar hot water system kit, which includes one

or more solar collectors, a solar storage tank, a pumping station, a

controller, and related accessories.

SOM 6 SI differential temperature controller: a solar system

controller providing one control function (e.g., one pump) and 3

sensor inputs.

SOM 7 SI differential temperature controller: a solar system

controller providing two control functions (e.g., two pumps or one

pump and one valve) and 4 sensor inputs.

SOM 8 SI differential temperature controller: a sophisticated solar

system controller providing up to nine control functions (pumps,

valves, etc.) and 15 sensor inputs. They are typically used for larger,

more complex (and/or commercial) systems.

STAK: storage tank accessory kit.

temperature/pressure gauge: a special mechanical gauge that

integrates both temperature and pressure indicators.

tensile force: force acting in-line with a fastener or member, placing

it in tension, which would pull it apart if sufﬁciently high (above

its tensile strength). Tensile force acts in opposite direction than

compressive force (which would buckle or crush the member).

thermal conductivity: the ability of a material to conduct heat,

typically in units of W/(m.K); it is the inverse of thermal resistance.

thermo-siphoning: the passive convection or ﬂow of a ﬂuid

through a conduit that is caused by density changes due to

differences in temperature from one point in the conduit to another.

Thermosiphons are particularly prevalent in vertical loops of pipe

carrying liquids where one side of the loop is exposed to a warmer

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Stiebel-eltron SOL 25 PLUS Manuel d'utilisateur Page 69

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