Engineering
Community College of Philadelphia PV Modules Temperature Correction Exam Practice

Community College of Philadelphia

Question Description

I’m working on a Engineering question and need guidance to help me study.

I need help with my assignment, it is about the topic future energy . they are 5 questions ONLY solve for question 2, 3, and 5.
Solve only the questions mentioned

attached below
if there is any question regarding the homework let me know
I am attaching two tables related to the HW
see file attachments

Community College of Philadelphia PV Modules Temperature Correction Exam Practice
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Community College of Philadelphia PV Modules Temperature Correction Exam Practice
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Homework 2 Please make sure that the work you present is easy to follow. Problem 1 (combining PV modules) How many BP 5170 PV modules and in what m x n configuration (m is the number of parallel branches and n is the number of cells in series in each branch) will provide 144V and 2 kW power at rated conditions? Find the specifications for the BP 5170 module on the web. Problem 2 (PV modules output) Estimate the monthly and the annual kWh production of one BP 3160 module in Meridian, MS. Use Excel (or any other software) and average daily solar irradiation data for Meridian, MS for the following cases: (a) Fixed tilt at latitude angle (b) Fixed tilt Latitude + 15○ October through February and fixed tilt Latitude - 15○ March through September (c) Single axis with North-South axis and latitude angle (d) Two-axes tracking Graph and compare monthly variation of electricity production for all cases. Also compare the total annual electricity generation (kWh) for all cases methods (a) through (d). Discuss briefly. Present one calculation (case (a) for January) by hand and all results printed out from Excel. Problem 3 (PV modules temperature correction) For the same conditions as in Problem 2 (a), use average daily solar irradiation data for Meridian, MS and calculate for each month: (a) Average solar irradiation Gi (W/m2) during daylight hours. For simplicity, assume 8 hours of daylight per day each month. (b) Average temperature of the solar cell for each month (using average Ta from Meridian, MS data tables and Gi from (a) above) (c) Percent reduction in solar cell efficiency due to the elevated solar cell temperature (d) Monthly electricity generation (kWh/month) (e) Total annual electricity generation (kWh) Discuss the results. Submit one calculation (for January) by hand and a printout from Excel. ○ Recall equations: PV = 0 [1− PV NOCT −20 | TC −T0 |], where T0 = 25 C and TC =Ta + Gi . 800 See lecture notes for nomenclature and units. Problem 4 How much energy could a 24V 200 amp-hour battery store? Give answers in (J) and in (kWh). Problem 5 (heating system analysis using the f-chart method) An office building in Philadelphia is to employ Heliodyne Gobi 408-002 flat-plate solar collector for space and water heating. The estimated monthly load is estimated as 130, 120, 100, 70, 25, 20, 20, 20, 20, 25, 70, and 105 GJ (gigajoule) for January, February, …, December, respectively. The solar energy system is to provide all the heating requirement for the summer months and a yearly solar heating fraction of 50%. (a) How many solar collectors are needed? (b) If natural gas costs $9 per million Btu, how much is saved by the active solar system. Use f-chart method, Excel (or any other software) and NREL insolation data for Philadelphia. Show hand calculations for June. ...
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Final Answer

Attached.

Homework 2
Please make sure that the work you present is easy to follow.

Problem 2 (PV modules output)
The solution to this problem have been accomplished using Excel, where each days in each
months are defined. The data for meridian, MS provides the necessary solar data for performance
estimates. For part a, the average monthly data for a surface tilted at a latitude angle is used for the
irradiation incident on the model and is entered in the vector IT. The irradiation is units of KW per
square meter per day. The nominal power from the module is 160 at a 1000w.m2 irradiation. The
electronic generation every day would be
Elec F =

160 𝑊

IF

𝑊
𝑀2

1000

The monthly electricity produced Et is found by multiplying daily production times the number of
days. The same procedure is done in other parts except that the data for the surface for a surface
with two other sections in the data table results are used.
Month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Total

Days
31
28
31
30
31
30
31
31
30
30
30
31

IF (Kw.H/m2. day) IT (Kw.hr/m2.day)
3.6
4.4
5
5.6
5.6
5.6
4.8
5.4
5.5
5.2
4.1
3.5

4.5
5.4
6.2
7.2
7.6
7.8
7.3
7.1
6.5
6.4
5.1
4.4

Fixed tilt Latitude + 15/-15
1-axis
3.3
4
4.7
5.1
5.3
5.5
5.5
5.5
5.1
4.4
3.4
2.9

IF1
3.3
4.6
3.7
7
7.5
7.7
7.2
7.6
6.1
4.4
4.6
3.2

IT1
17.856
19.712
24.8
26.88
27.776
26.88
23.808
26.784
26.4
24.96
19.68
17.36
282.896

22.32
24.192
30.752
34.56
37.696
37.44
36.208
35.216
31.2
30.72
24.48
21.824
366.608

Fixed tilt1 I axis1
16.368
16.368
17.92
20.608
23.312
18.352
24.48
33.6
26.288
37.2
26.4
36.96
27.28
35.712
27.28
37.696
24.48
29.28
21.12
21.12
16.32
22.08
14.384
15.872
265.632 324.848

Comparison of four Variations of
electricity production
Kwh/month

150

100
50
0
1

2
...

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UIUC

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