Cli-mate CLI-AP30 Specifikace stáhnout pdf (Strana 15)

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

525 lbs. of water x 77°F = 40,425 Btu.

Assuming 15% daily tank heat loss = 46,490 Btu/day required.

3.3.4. Calculating Collector Size Requirement

Based on the energy requirement calculated above, an estimation of the number of collectors can be made.

a) To calculate the output of the solar collector to match the household/application requirements a complex

calculation can be completed, but in most cases the following basic guide can be used. These values are

based on SRCC data for the Apricus collectors, (SeeAppendix 4), and based on Apricus’ actual field

observations of output.

Thousands of BTU Per Panel Per Day

Category

Clear Day

Mildly Cloudy

Cloudy Day

A (-9

46.1

34.8

23.5

B (9

44.0

32.7

21.4

C (36

40.6

29.3

18.0

D (90

34.2

23.0

11.8

E (144

27.1

16.8

6.2

Cold region = Average of Clear Day B, C & D and Mild Cloudy B, C & D categories = 33.9 kBtu = 9.9kWh

Mild region = Average of Cold region and Hot region values = 36.75 kBtu = 10.75kWh

Hot region = Average of Clear Day B, C & D categories = 39.6 kBtu = 11.6kWh

The actual daily output will vary based on many factors, including the installation angle, solar radiation

levels, ambient temperature and hot water usage patterns. Given that collectors come in multiples of 10

tubes a rough estimate is usually sufficient. A system should be sized to provide 90% contribution in the

summer, which normally corresponds to about 60%, 70% & 80% annual contribution for Cold, Mild and Hot

regions respectively.

b) Based on the requirements from the examples given in 3.3.3, an appropriate collector size can be

determined.

Cold climate: 57.35 kBtu/day required. 30 tubes averages 33.9 kBtu/day

57.35 kBtu / 33.9 kBtu = 1.7 x 30 tubes is necessary to make up the difference. Therefore, a 30 tube

collector plus 20 tubes (or 50 tubes total) will provide nearly all of the summer hot water requirements

for this household and ~60% of annual requirements. Alternatively, a good option might be 60 tubes

with the collector angle raised to about 50-60° in order to maximize winter output and minimize

summertime potential for overheating.

Hot climate: 40.43 kBtu/day required. 30 tubes averages 39.6 kBtu/day

40.43 kBtu / 39.6 kBtu = (about) 1. So an AP-30 would be the perfect size, providing nearly all the hot

water required in the summer and about 80% throughout the year.

c) Apricus OG-300 systems are available in one or two AP-30 sizes. It is important not to oversize the

system.

3.3.6. Domestic Storage Tank Sizing

a) Tank Size: Choosing the correct tank size for domestic applications is straightforward. On average,

houses change hands every 7 years, therefore, it is advisable to size the solar capacity to the potential

occupancy of the house, rather than the current occupants. A larger or smaller family may move in. In a mild

climate, each person in a household will, generally, require about 20 gallons (76L) per day of solar storage.

So, multiply the number of bedrooms plus one (because the master bedroom can hold two), to get the

approximate hot water demand for the house.

For example, a 3 bedroom house uses 80 gallons (303L) per day

3 bedrooms +1 (for master) = 4 people x 20 gallons = an 80 gallon storage tank

Always keep the customer’s budget in mind and contact an Apricus representative if you have any

Apricus Solar Collector Installation & Operation Manual - USA

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