Prof. Wilfred I. Okonkwo
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Professor, Renewable Energy Technologies

Prof. Wilfred I. Okonkwo

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Prof. Wilfred Ifeanyi Okonkwo is a certified professional Engineer and a University lecturer. H holds Ph.D, M.Eng and B.Eng. in Agricultural Engineering from University of Nigeria, Nsukka (UNN) and the University of Agriculture, Makurdi, Nigeria. Prof. Okonkwo previously served as the Head, department of Agricultural and Bioresources Engineering, UNN (2012 -2016) where he instructs courses in food and bioprocess engineering, renewable energy technologies and climate.

He served as a unit Head, solar thermal at the National Centre for Energy Research and Development (NCERD) Energy Commission of Nigeria (ECN), Nsukka Centre for several years (2005 – 2006 and 2008 – 2012). In addition to University of Calabar and Federal University of Wukari, Nigeria, has was a visiting Professor at numerous Universities including Rivers State University of Technology, Port Harcourt. He has completed a number of renewable energy projects and worked as a consultant for USAID and UNIDO on the Cross River State Renewable Energy Master Plan Draft and the well-known Ebonyi State Solar Desalination of Okposi and Uburu lakes water in Ebonyi State respectively.

Research Interest

  • Food and Bioprocess Engineering
  • Renewable Energy Application/Technologies
  • Biomass/Biogas Technologies
  • Structures and Environmental Control Engineering

Prizes And Grants Academic/Professional Qualifications with Dates

  • 2022 TETFUND National Research Grant .
  • Special Grant on Invention and Innovation, Federal Government of Nigeria, Presidential Standing Committee on Inventions and Innovation, Federal Government of Nigeria (2021) .
  • Optimization of a passive solar energy poultry chick brooder(1998).
  • Solar poultry chick brooding (external), UNISPAR grant (1999).
  • Solar Brooding, Excellent Contribution in Science and Technology, National Universities Fair (2005).

Educational Institutions Attended with Dates

  • Professor, Agricultural and Bioresources Engineering, University of Nigeria     2008 
  • Ph.D, Agricultural Engineering, University of Nigeria, Nsukka, Nigeria            2000     
  • M.Eng., Agricultural Engineering, University of Nigeria, Nsukka, Nigeria        1993 
  • B. Eng.  University of Agriculture, Makurdi, Benue State, Nigeria                     1989     
  • West African School Certificate, Boys High School, Ihitenansa, Imo State         1982 

1.     Development of a Stand-alone Solar Energy System for Sustainable Rural-Urban Poultry production (2020)
2.     USAID National Consultant:  Alternative Energy Policy Draft for Cross River State, Nigeria (2009)
3.     Pioneered research into the use of solar energy for poultry egg incubation (hatching of eggs), funded by the National Centre for Energy Research and Development, University of Nigeria, Nsukka (2009) 
4.     Design and Construction of NCERD Commercial Solar Energy Crop Dryer  (2008)
5.     UNIDO National Consultant: Ebonyi State Solar Energy Salt Extraction from Okposi and Uburu Lake Waters (2005).
6.     Design and Construction of Solar Desalination System for Salt Production in Ebonyi State for Cooperative Society (2005)
7.     Design and Construction of the NCERD Trombe Wall 2000 birds capacity solar poultry chick brooder (2004)
8.     Design and Construction of the Eziani Commercial Solar Energy Powered Trombe Wall Poultry Farm, Eziani, Nsukka L.G.A. Enugu State (2002)
9.     Design, Construction and Performance Evaluation of 150 capacity Trombe Wall Poultry Chick Brooding System at NCERD, UNN, Ph.D Research work (2000). 
10.     Construction of Prototypes of Passive Solar Energy Poultry Chick Brooding Systems for Commercial Trials in Enugu State, Nigeria, funded by the United Nations Educational, Scientific and Cultural Organization (UNESCO) under the University Industrial – Science Partnership (UNISPAR) programme (2000)
11.     Pioneered research into the utilization of solar energy for poultry chick brooding, funded  by the National Centre for Energy Research and Development, and the University of Nigeria Senate Research Grant, University of Nigeria, Nsukka (1993)

 

a)     Fellow, African Academics Network (FAAN) 2023
b)     American Society of Agricultural and Biological Engineers, ASABE (1055250) 2018
c)     Fellow, Renewable and Alternative Energy Society of Nigeria,(RAESON)      2017
d)     Council for Registered Engineering Regulation of Nigeria(COREN) 2014
e)     Acoustical Association of Nigeria 2013
f)     Asian-Pacific Chemical, Biological and Environmental Engineering (APCBEES) 2012
g)     Renewable and Alternative Energy Society of Nigeria 2013
h)     Fellow, Solar Energy Society of Nigeria, (FSESN) 2010
i)     International Solar Energy Society (ISES) 2005   
j)     Nigerian Society of Engineers (NSE) 2000
k)     Solar Energy Society of Nigeria (SESN) 1999
l)     Nigerian Institution of Agricultural Engineers (NIAE)1995

 

Journal Articles 

1. Nneoma Nkem Aneke, Wilfred Ifeanyichukwu Okonkwo, Sunday Loius Ezeoha, Gabriel Ifeanyi Okafor and Cosmas Ngozichukwu Anyanwu (2023). Optimization of Anthocyanin Extraction from Roselle (Hibiscus sabdariffa),Journal of research and Innovation in Food Science and Technologyhttps://doi.org/10.22101/jrifst.2022.350494.1380

 

2. Kolawole Emmanuel and Okonkwo W. I. (2022). Impacts of Climate Change on Environment and the Remedies, International Journal of Weather, Climate Change and Conservation Research, 8 (2), pp 1 - 9.

3. W. I. Okonkwo, C. J. Ohagwu, O. Ojike, G. I. Ezenne, K. E. Olayinka and A. U. Onyechi (2022). Socio-Economic Importance of Solar Energy Application in Poultry Production System, Journal of Scientific Research & Reports, 28 (11), pp. 112 -126. 

 

4. B. U. Ogbu, W. I. Okonkwo and S. N. Ugwu (2021). Development of a Modified Environment for Oyster Mushroom (pleurotusostreatus) Production System for Rural use in Southeast, Nigeria. Nigerian Journal of Technology Vol. 40 No. 3, pp. 518 – 525.

 

5. Okonkwo W. I; C. O. Akubuo and C.J. Ohagwu (2021). Design, Construction and Performance Evaluation of a Trombe Wall Poultry Day – old Chick Brooding House, Journal of Food Processing and Technology Vol. 12 Issue 9. No. 908. Pp. 1 – 7.

 

6. Ugwu Kenneth Chikwado. and Okonkwo Wilfred Ifeanyi. and Okafor Gabriel Ifeanyi (2020) Determination of Cashew Juice specie’s Shelf-Life at Natural Storage Using Multivariate Regression Model, Journal of Engineering technology Vol. 9 Issue 2, 2020. Pp 106 – 120.

 

7. Kenneth Chikwado Ugwu and Wilfred Ifeanyi Okonkwo (2020). A survey questionnaire of cashew nuts processing methods in Enugu state,  AgricEngInt: CIGR Journal Open access at http://www.cigrjournal.org Vol. 22, No. 4, pp. 134 – 140.

 

8. Ugwu Kenneth Chikwado and Okonkwo Wilfred ifeanyi(2020). Determination of Cashew Fruit Juice Quality Retention Using Factorial Design Method under Non Refrigerated Storage, International Journal of Emerging Technologies in Engineering Research (IJETER) Vol.8, Issue 11, November (2020) 

 

9. Ugwu K.C and Okonkwo W.I (2020). The effect of deteriorative Factors on the ascorbic Acid Level of Cashew Fruit Juice During Non-Refrigerated Storage, Discovery

 

10. S. N. Ugwu, O. Ojike, W.I. Okonkwo, E. Okafor, B. O. Ugwuishiwu and E. A. Echiegu (2020). Evaluation Studies of a mixed mode solar kiln with phase change material and distributed-type solar kiln, Case Studies in Thermal Engineering

 

11. S. A. Ngabea, W.I.Okonkwo, E.A. Echiegu. G.I.Okafor and P.IAkubor (2020. Optimization of Temperature, Packaging Materials and time on the Proximate Compositions of Bambara Nut Flour, Asian Journal of Plant Science. 

 

12. Asoiro, F.U., Okonkwo, W.I and Nweze, N.O. 2019. Studies on the growth rate, oil yield and properties of some indigenous fresh water microalgae species. Journal of Environmental Science and Technology, 12 (4): 164 - 176 https://scialert.net/archivedetails.php?issn=1994-7887&issueno=61

 

13. F. U. Asoiro, W. I. Okonkwo, C.  O. Akubuo, N. O. Nweze and C.  N.  Anyanwu 2019). Effects of temperature and time on oil extraction from some Nigerian indigenous fresh water microalgae species. CIGR Journal Open Access Vol. 21 (2) July 2019:1-12.

 

14. Ohagwu C.J, Okonkwo W.I, Akubuo C.O, Mbah G.C.E and Njoku H.O (2019). Stability of Analysis of Trombe Wall Solar Chick Brooder, Inmateh: Agricultural Engineering. 

 

15. K. C. Ugwu; C. C. Mbajiorgu ;W. I. Okonkwo and A. O. Ani (2018). Design, Fabrication and Performance Evaluation of a Portable Hand-Held Refractometer, Nigerian Journal of Technology (NIJOTECH), Vol. 37 No. 2, pp. 537 – 542.

 

16. Kwino D. I; Okonkwo W. I. and Obi F. O. (2017). Effects of Roasting on the Physical Properties of Monodoramyristica (African nutmeg), International Food Research Journal 24 (3), 1148 – 1155, June 2017. 

 

17. Okey Francis Obi, Jeremiah C. Ezema and Wilfred I. Okonkwo (2017). Energy Performance of Biomass Cookstovesusing fuel briquettes, J. Biofuels, http://dx.doi.org/10.1080/17597269.2017.1374769

 

18. Okonkwo W. I. and Uke O. S. (2016). Comparative Effect of Tilt Angles of a Double and Single Tilted Glazed Solar Desalination Systems, African Journal of Renewable and Alternative Energy, Vol. 1 No 2, pp 46 –n53.

 

19. Uke O. S. and Okonkwo W. I. (2016). Development and Performance Evaluation of a Pyramidal Passive Solar Desalination System, African Journal of Renewable and Alternative Energy, Vol. 1 No. 1 pp 90 – 97.

 

20. Okonkwo W. I. (2016). Nigeria Should Embark on Climate Smart Agriculture Now. The Nigerian Guardian, pp 51 10th January 2016.

 

21. Owo I. P; Okonkwo W. I. and Nwoke O. O. (2015). Development and Testing of a Prototype Parabolic Trough Solar Collector for Steam Generation at Nsukka, South East, Nigeria.       

 

22. NgabeaShianya and Wilfred Ifeanyi Okonkwo and Jacob Liberty(2015). Design, Fabrication and Performance Evaluation of a Magnetic Sieve grading Machine, 2(8), pp. 65 77.

 

23. Oknkwo W. I.; E. A. Echiegu; J. N. Ogbuisi and T. J. Liberty (2015). Characterization of a Fibre reinforced Concentrated Solar Cooker, International Journal of Innovation and     Applied Studies, Pp 1058 – 1064.

 

24. Chukwuma E. C. and Okonkwo W. I. (2013). Kinetic Assessment of Biogas Production of Co-Digestion of Cattle Paunch Manure With Cow Dung, J. Agric. Engineering and   Technology (JAET), Vol. 21 (No 1) June 2013.

 

25. Liberty J. T; Okonkwo W. I. and Echiegu E. A. (3013). Evaporative Cooling: A Postharvest Technology for Fruits and Vegetables Preservation, International Journal of   Scientific and Engineering Research, Vol. 4, Issue 8, August 2013.  

 

26. Obi, O. F; Akubuo, C. O. and Okonkwo, W. I. (2013). Development of an Appropriate Briquetting Machine for Use in Rural Communities, International Journal of Engineering   and Advanced Technology (IJEAT), Vol. 2(4), pp. 2249 – 2258.  

 

27. Okonkwo W. I, Uzodinma E. O. and Ojike O. (2012). Performance Evaluation of a Hybrid Solar Dryer using Drying Characteristics of COD Fish (Gadus Morhua), Nig.   Journal of Solar Energy , Vol. 23, 2012, pp. 17 – 22.   

 

28. P. N. nwosu, O. U. Oparaku, W. I. Okonkwo, G. O. Unachukwu and D. Agbiogwu(2011).Experimental Study of a Thermosyphon Solar water Heater Coupled to a Fibre-   Reinforced Plastic (FRP) Storage Tank, Applied Solar Energy, Vol. 47. No. 3. Pp. 207 –  212.      

 

29. Nwoke O. O; Ojike O, Onwualu A. P. and Okonkwo W. I. (2011). Development and Evaluation of a Solar Powered Rice Packaging Machine, Agricultural Engineering    International: CIGR Journal, No. 1646. Vol. 13, No. 1, 2011.   

 

30. Ojike O, Nwoke O. O. and Okonkwo W. I. (2011).  Influence of Different Solar Drying Systems on the Vitamin Content of Pawpaw, Austrian Journal of Agricultural                 Engineering, pp. 8 – 11.   

 

31. Ikejiofor M. C. and Okonkwo W. I. (2010). Design and Development of an active solar dryer with adjustable air flow rates for agricultural products, J. Agricultural Engineering       Technology (JAET), Vol. 18 No. 2, Pp 70 – 76.

 

32. Ojike*, O., Nwoke, O.O. and W. I. Okonkwo (2010). Comparative Evaluation of Passive Solar Dryers Using the Drying Rate Constants of Yellow Pepper and Okro as a Case Study. Nigerian Journal of Solar Energy, Vol. 21 (1): 169-172

 

33. Ojike*, O., Nwoke, O.O. and W. I. Okonkwo (2010). Comparative Evaluation of Passive Solar Dryers Using the Drying Rate Constants of Tomato as a Case Study. International Journal of Physical Science, Vol. 5 (1): 34-40

 

34. Okonkwo W. I,  O. U. Oparaku and P.N. Nwosu (2010). Mathematical Modeling of a Trombe Wall System for Poultry Brooding Application in the Tropics (with Sub-Saharan            Climate), in press, Solar Energy.

 

35. Agunwamba J. C, Utsev J. T. And Okonkwo W. I. (2009). Solar Enhanced Wastewater Treatment in Waste Stabilization Ponds, Water Environment Research, Vol. 81. No. 5, pp 540 - 545  

 

36. Nwosu P. N. and Okonkwo W. I. (2008). Effect of an Absorptive Coating on Solar Energy Storage in a Trombe Wall System, Energy and Buildings, Vol. 40 (3)Pp. 371 - 374.

 

37. Anyawu C. N. and Okonkwo W. I. (2008). Experimental Determination of the Drying Rate of Yellow Pepper (Capsicum annum), Nig. J. Solar Energy, Vol. 19. No.1. Pp. 18 24. 

 

38. Nwoke O. O, Okonkwo W. I. and O. U. Oparaku (2008). Solar Energy Use in Nigeria: Constraints and Possible Solutions, Nig. J. Solar Energy, Pp. 90 – 93.

 

39. Okonkwo W. I. and Nwoke O. O. (2008). Family Size Green House Solar Energy Crop Dryer, Nig. J. Solar Energy, Vol. 19 No.2 pp 6 – 10.

 

40. Okonkwo W. I. and C. O. Akubuo (2007).  Trombe Wall System for Poultry Brooding,  International Journal of Poultry Science, 6 (2), pp. 125 - 130.

 

41. Falayi E. O; Rabiu A. B.  and Okonkwo W. I. (2006). Relationship Between Global Solar Radiation and Surface Temperature in the Tropics, Journal of Research in Physical Sciences, Vol. 2. pp. 59 – 63.

 

42. Oparaku N. F and Okonkwo W. I. (2006). Comparative Studies of Kerosene Stove and Sawdust Stoves, Nigerian Journal of Solar Energy, Vol. 16, pp. 54 – 60

 

43. Nwoke O. O. and Okonkwo W. I. (2006). Biogas Technology: A Sustainable Energy and Waste Management Option for Rural Development in Nigeria, Nigerian Journal of Solar Energy, Vol. 16, pp. 195 – 199

 

44. Okonkwo W. I. and E. C.  Okoye (2005). Integrated Pebble Bed Passive Solar Energy  Storage Crop Dryer, Nigerian Journal of Technology Vol. 2, Pp. 67 – 73. 

 

45. Okonkwo W. I. (2004). Thermosyphon Solar Energy Egg Incubator for Tropical Countries, Journal of Agricultural Engineering and Technology Vol. 12

 

46. Okonkwo W. I. and S. N. Ukachukwu (2004).  Effects of Passive Solar, Electric and Kerosene Brooding Systems on the Performance of Broiler Chickens, Journal of Sustainable Agriculture and the Environment, Vol. 6. No. 1, pp. 1- 6.

 

47. Okonkwo W. I. and A. P. Onwualu (2002).  Design, Construction and evaluation of a Pyranometer for Solar Radiation measurement, Journal of Pure and Sciences, pp 234 -340 Vol. 5. No.2.

 

48. Okonkwo W. I. (2003).  Attainment of Sustainable Electricity Supply in Nigeria: The  Photovoltaic (PV) Option, Journal of Science and Technology Research; pp. 74 - 79.

 

49. Okonkwo W. I. and C. O. Akubuo (2001).  Thermal Analysis and Evaluation of Heat  Requirement of a Passive Solar Energy Poultry Chick Brooder, Nigeria Journal of Renewable Energy, Vol. 9, Nos. 1 & 2.  pp.83 – 87.   

 

50. Okonkwo W. I. and A. P. Onwualu (2000).  Utilization of biogas Fuel in Internal Combustion  Engine System, Nigerian Journal of Renewable Energy Vol. 8. No. 1 & 2 pp. 83 – 88.

 

51. Okonkwo W. I, C. O. Akubuo and P. Mageswaran (1999).  Development and Evaluation of a Concentrating Solar Cooker under Nsukka Climate, J. Agricultural Engineering and Technology, Vol. 7. Pp. 29 - 35    

 

52. Okonkwo W. I. (1998).  Energy for Sustainable Environment and Economic Growth, Bullion, Publication of Central bank of Nigeria, Oct./Dec. Edition 1998.  Vol. 22. No. 4. Pp. 44 – 49.

 

53. Okonkwo W. I; O. C. Iloeje, E. A. Echiegu and C. O. Akubuo (1993).  Performance evaluation of a medium Scale Passive Solar energy Heated chick Brooder, Nigerian Journal of Solar Energy, Vol. 12. Pp. 51 – 60.  

 

54. Okonkwo W. I; U. G. N. Anazodo, , E. A. Echiegu, O. C. Iloeje and C. O.  Akubuo (1992).  The passive Solar energy Chick Brooder: Further Improvement and preliminary testing. Nigeria Journal of Solar energy, Vol. 11. Pp.32 – 40.  

 

 Conference Papers Refereed and Published

55. W. I. Okonkwo and C. O. Akubuo (2018). Design, Construction and Performance Evaluation of a Trombe Wall Poultry Brooding House, paper presented at Annual Meeting of the American Society of Agricultural and Biological Engineers (ASABE) 2018, Cobo, Detroit, Michigan U.S.A, 29th July – 1st August, 2018.

 

56. W. I. Okonkwo (2018). Renewable Energy Application an Alternative Towards Sustainable Poultry Production, Paper presented at the 1st International Engineering Conference,

Organized by the Faculty of Engineering, University of Nigeria, Nsukka, 25 – 28 April, 2018.

 

57. W. I. Okonkwo (2017). Renewable Energy Applications and utilization for Economic recovery, proc. Of the 18th Conference and 38th Annual Meeting of the Nigerian Institute of Agricultural Engineers (NIAE), Umudike, pp. iv – xvii. 

 

58. W. I. Okonwo (2016). Agricultural Reform: A panacea for Diversification of Nigeria Economy,A Pre-Convocation Lecture in Commemoration of the Kaduna Polytechnic 32nd Combined and Diamond Jubilee Ceremonies, at Kaduna polytechnic. Kaduna, 22nd July, 2016 

 

59. Nwoke, O.A., W.I Okonkwo, C.C Anyadike and E.C. Chukwuma (2013). Leachate Management and Treatment in Municipal Solid Waste Landfill. Proceedings of Nigerian Association of Hydrological Sciences (NAHS), Vol. 5, 104 -118. 

 

60. O.F .Obi, J.N. Nwakaire, W.I Okonkwo, B.O. Ugwuishiwu, C.C. Anyadike (2012) Repositioning Agricultural Develpoment in Africa through Appropriate Technological Transfer. Proceeding of Nigeria Institution of Agricultural Engineers. (NIAE) Vol.33 Pp 556-566. 

 

61. Nwoke , O.A Okonkwo, W.I, Ugwuishiwu, B. O., Chukwuma, E.C.,Ezenne, G. I. and Ohagwu,C.J (2013).Technicalities of Solar Photovoltaic Crop Irrigation Water Pumping. Proceeding of Nigeria Institution of Agricultural Engineers. (NIAE) Vol. 34 pp 292-300

 

62. Nwaoga J. A; Okonkwo W. I. and G. O. Unachukwu (2011). Exploring the Photo Sensitivities of Mimosa Pudica for Solar Cell Production, paper presented at 26th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 5 – 9 September, 2011, pp 406 – 410.  

 

63. Okonkwo W. I. (2010). Photovoltaic Technology in Agricultural Production: Nigeria, Workshop Proc; ISTIC-TWAS Workshop on Innovation in Science and technology for Developing Countries in the South, Penang, Malaysia, 6 – 7 September, 2010 pp. 171 – 175.eptember, 2011.

 

64. Ojike O, Nwoko O. O. and Okonkwo W. I. (2010). Comparative Evaluation of Passive Solar Dryers Using the Drying Rate Constants of Tomato as a Case Study, Proceedings First World Congress on Research and Development, University of Port Harcourt, Rivers State, Nigeria, February 9 – 12, 2010, pp. 34 – 40.  

 

65. Ojike O, Nwoke O. O. And Okonkwo W. I. (2009). Comparative Evaluation of Drying  Efficiency of Passive Solar Dryers Using the Drying Rate Constants of Yellow Pepper  and Okro as a case study, Proceedings Solar Energy Society of Nigeria, Makurdi, 2 – 5 December 2009.

 

66. Okonkwo W. I,Oparaku O. U. And Chukwuezie O. C. (2009). Design, Construction and Characterization of a Photovoltaic Powered poultry Egg Incubator, Proceedings, Engineering Congress on Alternative Energy Applications, 2 – 6 November, 2009, Kuwait. 

 

67. Nwagugu N. I. And Okonkwo W. I. (2009). Experimental Determination of Compressive Strength of Sweet Cassava (Manihot Esculanta), Proceedings of 3rd West African

Society for Agricultural Engineering and 9th Nigeria Institution if Agricultural Engineers International Conference, Obafemi Awolowo University, Ile-Ife, Nigeria, January, 25 – 29th , 2009, pp. 192 – 196. 

 

68. Michael Chendo, Okonkwo W. I. and A. B. Rabiu (2008). Performance Characteristics of a Salt Recovery Solar Desalination Plant, Proceedings,  World

Renewable Energy Congress-X, Glasgow, Scotland, 19 -25 August 2008, pp. 1849 – 1852.

 

69. G. I. Okonkwo and W. I. Okonkwo (2008). Applications of Solar Energy Water Heating             In Agriculture, Proceedings, 1st Annual Nigerian Institute of Agricultural Engineers            South-East Regional Conference, Namdi Azikiwe University, Awka, AnambaraState,           Aug. 2008. Pp 152 – 161.

 

70. Okonkwo W. I. and C. J. Ohagwu (2008). Design, Construction and Performance Evaluation of a Batch Type Biogas Digester in Nsukka, Nigeria, Conf. Proc. the 6th International Conference and 29th Annual General Meeting of the Nigerian Institute of Agricultural Engineers, Vol. 29, Pp. 445 – 451; 28th January – 1st February 2008, Adamawa State Polythnic, Yola.

 

71. Anyawu C. N, N. O. Nwoko, Okonkwo W. I., S. I. Eze and O. U. Oparaku (2007). Design, Construction and Performance Testing of an Active Solar Crop Dryer, Proc. The 37th Annual Conference of the Nigerian Society of Chemical Engineers, Enugu, 22 – 24 Nov. 2007, pp 1 – 9.

 

72. Okonkwo W. I, O. O. Nwoke, J. T. Thomas and M. A. Chendo (2007). Techno-Economic Impact of Solar Crystallization of Salt Production, Proc. International Workshop on Renewable Energy for Sustainable Development in Africa (IWRESDA), National Centre for Energy Research and Development, University of Nigeria, Nsukka, 30th July – 1st August 2007, pp. 116 – 124.   

 

73. Okonkwo W. I. (2007). Solar Heating for Sustainable Poultry Production, Proc. International Workshop on Renewable Energy for Sustainable Development in Africa (IWRESDA), National Centre for Energy Research and Development, University of Nigeria, Nsukka, 30th July – 1st August 2007, pp. 125 - 130.   

 

74. Okonkwo W. I. (2005). Passive Solar Heating for Poultry Chick Brooding in Nigeria, workshop paper, Physics for Renewable Energy, The Abdus Salam International Center for Theoretical Physics, Trieste, Italy, 17 – 29 October, 2005.

 

75. Onuoha N. R. and Okonkwo W. I. (2005). Renewable Energy for sustainable Rural Livelihooh in Nigeria. Proceedings of the Nigerian Institution of Agricultural Engineers, Yenagoa, 12 – 15 December, 2005.

 

76. Okonkwo W. I. and C. N. Anyawu (2004). NCERD Basin-type Passive Solar Still: Design, Construction and Performance Evaluation, Proc. The 5th International Conference and 26th Annual General Meeting of the Nigerian Institute of Agricultural Engineers, Vol. 26, Pp. 445 – 451; 2 – 6 December 2004, University of Ilorine, Nigeria.

 

77. Okonkwo W. I. and Agunwamba J. C. (1997).  Socio-Economic Impact of Solar Energy  Brooding System.  Conf. Proc. 3rd International Conf. On Power Systems Operation and  planning, Abidjan, Cote D’Voire, 13 – 17th Jan. 1997.

 

BOOKS/CHAPTERS IN A BOOK

78. Okonkwo W. I. and Ogbuisi J. N. (2019). Reinforced Fibre Plastic Solar Energy Cooker, Lambert Academic Publishing, Germany.

79. Okonkwo W. I. (1998). Solar Chick Brooding, Rural Renewable Energy Needs and  Five Supply Technologies, Energy Commission of Nigeria (Federal Ministry of Science  and Technology, pp. 61 – 71. 

 

TECHNICAL REPORTS

80. Final Draft, Alternative Energy Policy for Cross River State. Report submitted to the United State Agency for International Development (USAID), 2009. 

 

81. Social and Techno-Economic Aspect of Introducing Solar Crystallization Process to the Salt Manufacturing Communities of Uburu and Okposi Salt Lake, Eboyi State, Nigeria.

Report submitted to the United Nations Industrial Development Organization (UNIDO), 2005.

 

82. Solar Energy Chick Brooding for Commercial Trials in Enugu State. Report submitted to the United Nation Educational, Scientific and Cultural Organization (UNESCO), 1999.