Cli-mate CLI-AP30 Especificações descarregar pdf (Página 16)

questions.

b) Collector Size: The number of solar collectors should be determined based on actual hot water

requirements for the present occupants and should never exceed the storage capacity. If too much collector

is installed, there will be wasted energy and excess heat in sunny weather. Letting the collector stagnate is

an acceptable means of preventing excessive tank temperatures during summer but excessive stagnation

for more than 6 hours a day is unacceptable.

c) Minimum Storage Tank Size: The following are the minimum allowed tank sizes for domestic solar

thermal installations. Using a smaller capacity tank will lead to the system reaching maximum temperature

sooner, which will often result in wasted and/or uncollected energy. The storage capacity can be a single

tank or multiple tanks plumbed in parallel. If a solar storage tank is feeding an electric or gas boosted tank,

the capacity of the second tank must NOT be included, as solar heat only enters the second tank when hot

water is used.

30 tubes = 80 Gallons

60 tubes = 119 Gallons

d) Hot Water Usage vs Tank Size: In section 3.3.1, it was determined how much hot water the household

used. If they used 90 gallons of tap volume per day, that equates roughly to 63 gallons of draw from the hot

water tank. An 80 gallon tank will suffice. That said, bigger is generally better when it comes to storage and

if there is space for it and money in the budget, then increase the size of the tank to 119 gallons. This will

allow for more energy storage during periods of high solar gain and also ensure that there is plenty of hot

water, if relatives visit for the weekend (for electric or direct gas boosted tanks). Going to an even larger

tank would be great, but only if the insulation properties are excellent; the increased surface area of a larger

tank could cause considerable heat loss. Ideally, passive heat loss from the tank should not exceed 15% of

the total required daily hot water production.

e) Twin Tank System: For a household with an existing gas or electric hot water tank, the best option is to

solar storage option is to add a dedicated solar pre-heat tank, in which the entire volume of the tank is

devoted to solar heating. This may not always be possible from a cost or space perspective, but whenever

possible, adding a separate tank is advised. In this configuration, instead of the cold water supply entering

the existing tank, it enters the solar pre-heat tank, where it gains heat from the collector loop and in turn

supplies the secondary “booster” tank with solar preheated water; the outlet of the solar pre-heat tank feeds

the inlet of the secondary tank. When using a twin tank system an electric boosted solar tank can be used

as a pre heat tank with the electric element disconnected. Refer to system diagrams in the Apricus OG300

Systems Manual for examples available at www.apricus.com.

3.4. Pipe Type & Size

3.4.1. Pipe Material

a) The solar collector loop can get very hot and, therefore, the only recommended material choices are

copper (hard or soft coiled) or corrugated flexible stainless steel pipe.

3.4.2. Pipe Size

a) Pipe Selection: When selecting the size of the pipe for the solar loop or any plumbing, there are two

main concerns: flow rate and pressure drop

These two factors are closely related; a higher pressure drop will reduce the flow rate. Pressure drop is

increased with a smaller diameter pipe, as well as the presence of bends, elbows and other components

that will restrict the flow of the water such as corrugated stainless steel piping. A relatively direct,

unobstructed flow path is highly desirable.

b)Pipe Diameter: All Apricus OG-300 systems utilize 3/4” copper or corrugated stainless steel. It is

important to select a pipe material that will not create excessive pressure drop.

3.4.3. Pipe Location

Depending on the construction of the building, the route of the pipe run to the collector could be inside, outside

or even underground. Always consider the following factors:

a) Secure: Pipes must be secured in place with suitable brackets, straps, etc. according to plumbing code

requirements for material and pipe diameter and to prevent vibration and placing stress on system

Apricus Solar Collector Installation & Operation Manual - USA

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