Cli-mate CLI-AP30 Specifikace stáhnout pdf (Strana 14)

This rule of thumb is just an example. Adjust this to meet the habits of householders in your local area.

b) Calculation:

Shower-head flow rate is measured (timed with a bucket or special flow rate device) at 2.5 gpm (9.4 L/min)

and the family showers for a total of 35 minutes per day = 87.5 gallons.

Add hot water usage for the dish washer = 10 gallons.......etc

A calculation can then be completed for a specific household based on their expected water usage patterns.

c) Tap vs Storage Tank Flow Rate:

In the summer months, the solar storage tank can reach temperatures in excess of 160°F (71°C).

Therefore, the useful capacity at the tap is increased, because hot water from the tank is being diluted with

cold at the Anti-Scald Valve and, then, once again at the tap in the house (see diagram below).

The flow rate through the faucets is not equal to the flow rate at the tank outlet. While tap hot water volume

maybe be 90 gallons, if the hot water storage tank is 140°F (60°C), only 63 gallons will be drawn from the

hot water storage tank, in which case an 80 gallon tank would be suitable.

d) Climate:

We can estimate based on three types of climate: Cold, Mild & Hot.

Cold climates: Freezing winter and mild summers.

Mild climates: Mild winters with occasional freezing at night and fairly hot summers.

Hot climates: Warm winters and very hot summers.

The three key climate factors that location will effect,in terms of the collector output, are solar radiation

levels, ambient temperature and cold water inlet temperature. Take into consideration that there is massive

variance in these factors from one area to another, even within a single state and remember this is only an

estimate.

Cold regions: Hot water draw from the storage tank will be about 70% of the tap hot water volume

Mild regions: Hot water draw from the storage tank will be about 65% of the tap hot water volume

Hot regions: Hot water draw from the storage tank will be about 60% of the tap hot water volume

This variation is due to the difference in incoming cold water temperature, which is mixed with the hot at the

tap. The colder the Cold water, the lesser the volume of it necessary to temper the Hot water, hence the

greater percentage of storage tank volume used at the tap in colder regions. Apricus provides an Excel

based calculator for accurately calculating the ratio of hot and cold water.

3.3.2. Second Question: What temperature rise is required?

What is the temperature rise that is required within the hot water tank to heat cold water to the standard

outlet temperature of 140°F (60°C)? (140°F and sometimes up to 150°F is required to kill Legionella

bacteria).

Apricus recommends that you calculate for 90% solar contribution for summer months output so as to

not oversize the system.

In Cold regions, water will be heated from an average 50°F to 140°F = 95°F rise (10°C to 60°C = 52°C rise)

In Hot regions, water will be heated from on average 63°F to 140°F = 77°F rise (17°C to 60°C = 43°C rise)

3.3.3. Calculating Energy Requirements

Now that you know how much water is required and the temperature rise, you can calculate the energy required.

See examples below:

In Cold regions: 63 gallons with 95°F temp rise.

63 gallons x 8.34 lbs. of water per gallon = 525 lbs.

525 lbs. of water x 95°F = 49,875 Btu.

Assuming 15% daily tank heat loss = 57,356 Btu/day required.

In Hot regions: 63 gallons with 77°F temp rise.

Apricus Solar Collector Installation & Operation Manual - USA

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