due presentation1
DESCRIPTION
PresentationTRANSCRIPT
SIMULATION OF SOLAR COOLING SYSTEM FOR A
RESIDENTIAL BUILDING IN SOUTH AFRICA
Presented by Doudou N. Luta
Outline Introduction Case of study Simulation description Simulation results Economic analysis Conclusion References
Introduction
What is solar cooling system?Why solar cooling system?What is absorption cooling systemObjective of the paper
IntroductionWhat is solar cooling system?Solar cooling systems refer to the use of solar energy to power a cooling system.
Why solar cooling system? HVAC equipment are one of the major consumers of
electricity which result to an increasing cost of electricity bill
Conventional HVAC lead to environmental concerns due to the use of some refrigerants such as CFC (ChloroFluoroCarbon) and HCFC (HydroChloroFluoroCarbon)
Need of alternative clean energy sources to drive cooling units
Introduction (suite)What is an absorption cooling system?
An heat driven heat pumpObjective of the paper
Analyses the performance of an absorption cooling system driven by solar energy for a residential building located in south Africa
Case of study
Description of the case of studySimulation of Cape town weather data for
October 2013
Case of study Description of the case of study
We have considered an unknown residential building located in cape town with a cooling load 15kW
The simulation is based on the month of October 2013
The simulation tool used is Insel Software
Case of study (suite)Simulation of Cape Town weather data
Figure1 Solar Radiation simulation scheme
Peak daily radiation687 W/m2 of October
2013
Case of study (suite)D
aily
radi
atio
n in
W/m
2
Days of OctoberFigure 2 Daily global radiation of Cape Town versus hours in October 2013
respectively
Simulation description
Figure 3 Solar absorption air conditioning system simulation scheme
Simulation results
Collectors outlet temperature in ºC
Evap
orat
or r
efri
gera
tion
ca
paci
ty in
kW
Collectors outlet temperature in ºC
Evap
orat
or o
utle
t te
mpe
ratu
re
in º
CFigure 4 Refrigerating capacity of the
evaporator as function of the collectors’ outlet temperature
Figure 5 Evaporator temperature as function of the collectors outlet
temperature
Economic analysis The costs of solar absorption cooling systems are still very high compared to
conventional cooling systems. However, solar absorption cooling systems present the advantage of saving energy and money in term of payback.
A 15 kW solar absorption cooling system with 0.7 Coefficient of Performance will normally run at 15 kW x 0.7 = 10.5 kW
Assuming that this cooling system is operating 10 hours per day, the energy save for 10 hours would be 10.5 kW x 10 = 105 kWh. Under the current Cape Town electricity tariff rate, this cooling system would be charged:
105 kWh x 173.28 c/kWh [8] = R18.1944 per day
This means that R18.1944 is save every day, R545.832 every month and R6549.984 every year.
The average lifetime of the major solar cooling system components are generally approximated to 20 years [9]. Over this lifetime, the amount of money save would be R130999.68
Apart from the fact that the price of collectors and absorption cooling system components are still very high compared to conventional cooling systems, solar absorption cooling systems represents a good alternative cooling option.
Due the weather variation, in order the meet the cooling load requirement, the system must include an additional backup energy source. For a residential building, adding a backup source of energy increases the cost of installation and the overall size of the system compared to conventional cooling units. However, when comparing both systems in term of the long term running cost, solar absorption cooling systems present the advantage of saving money and energy.
Conclusion
Reference[1] D. M. Tagare, Electric Power Generation: The Changing Dimension, New Jersey: John
Wiley & Sons, 2011. [2] V. Mittal, K. Kasana and N. Thakur, “The study of solar absorption air-conditioning
systems,” Journal of Energy in Southern Africa, vol. 16, no. 4, pp. 59-66, 2005. [3] Z. Sayadi, S. El May, M. Bourouis and A. Bellagi, “Technical and economic analysis of a
solar assisted air conditioning systems,” IEEE Conference, pp. 331-338, 2010. [4] Y. Fan, L. Luo and B. Souyri, “Review of solar sorption refrigeration technologies:
Development and applications,” Renewable and Sustainable Energy Reviews 11, p. 1758–1775, 2007.
[5] ASHRAE, Handbook of HVAC Systems and Equipements, ASHRAE, 2008.
[6] C. A. Balaras, G. Grossman, H.-M. Henning, C. A. Infante Ferreira, E. Podesser, L. Wang and E. Wiemken, “Solar air conditioning in Europe—an overview,” Renewable and Sustainable Energy Reviews 11, pp. 299-314, 2007.
[7] M. H. Muzaffar and F. A. Ghaith, “Design and simulation of solar powered cooling system in UAE,” in Conf. on Future Trends in Structural, Civil, Environmental and Mechanical Engineering.
[8] C. o. C. Town, “www.capetown.gov.za,” 16 March 2014. [Online]. Available: https://www.capetown.gov.za/en/Pages/default.aspx. [Accessed 16 March 2014].
[9] L. C. Haw, K. Sopian and Y. Sulaiman, “An Overview of Solar Assisted Air-Conditioning System An Overview of Solar Assisted Air-Conditioning System,” in International Conference of Energy and Environnement, 2009.
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