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3. System Design

󱚡 NOTICE

Apricus provides the system design information contained herein as a guide only and does

not guarantee the accuracy of such information. In ALL cases the system design and

installation must adhere to local codes, regulations and guidelines and the suitability and

safety of the system design may need to certiﬁed by a licensed engineer, and ﬁnally

inspected by a plumbing inspector. All systems must be installed by Authorized Persons.

3.1. Type of Systems

The three most common system formats for solar thermal hot water installations are described below:

a) Direct Flow systems have potable water under the water main’s pressure flowing directly through the

solar loop piping into the collector and back down to the storage tank. These systems are suitable for areas

that do not fall below 23

F (–5

C) at any time throughout the year. Freeze tolerance limits are based upon

assumed set of environmental conditions. In the event of a power outage a drip valve will open to slowly

circulate fluid through the collector to prevent freezing.

b) Closed loop installations are suitable for cold regions and use an “anti-freeze” heat transfer fluid, instead

of potable water. This fluid is not mixed with the potable water. Heat transfer occurs through a coil heat

exchanger within the storage tank or an external heat exchanger.

Apricus has developed a set of system designs covering each direct flow and closed loop formats. Refer to

section 10 for more information.

Refer to the Apricus OG-300 Schematic and Parts Lists for component specifications and system diagrams.

3.2. Solar Collector & Storage Tank Location

3.2.1. Collector Direction

a) The collector should face as close to True South as possible. A deviation

of up to 15

to the East or West is acceptable and will have minimal effect on

collector performance. If installed due east or west, the solar collector output

will be considerably reduced, with predominately morning output or

afternoon output for each direction respectively. If a choice can be made,

west is preferable over east as solar radiation levels are often highest early

afternoon. NOTE: Installations at or near due East or West will mitigate the

passive tracking effect of the round absorbers within the Apricus evacuated

tubes.

b) If the roof faces E-W rather than South, there are a few options:

i) The collector angle can be raised up to 60-70

and positioned

near the peak of the roof so that both the front and back of the

evacuated tubes can be exposed to light. See image to the

right. In such a position wind loading must be carefully

considered.

Apricus Solar Collector Installation & Operation Manual - USA

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Cli-mate CLI-AP30 Spécifications Page 12