Department: Mechanical Engineering
Faculty: Engineering
Designation : Senior Lecturer
Email: howard.njoku@unn.edu.ng
Phone: +234 (0)809 148 9064

Publications (Articles and Journals):

Publications in Refereed Journals
1. H.O. Njoku, O.V. Ekechukwu and S.O. Onyegegbu (2018) Numerical Investigation of Entropy Generation in Stratified Thermal Stores.ASME Journal of Energy Resources Technology, 140: 011901,DOI:10.1115/1.4037535.
2. H.O. Njoku, B.E. Agashi and S.O. Onyegegbu (2017) A numerical study to predict the energy and exergy performances of a salinity gradient solar pond with thermal extraction. Solar Energy, 157:744-761, DOI:10.1016/j.solener.2017.08.079.
3. H.O. Njoku, O.B. Bafuwa, C.A. Mgbemene and O.V. Ekechukwu (2017) Benchmarking energy utilization in cement manufacturing processes in Nigeria and estimation of savings opportunities. Clean Technologies and Environmental Policy, 19(6): 1639-1653, DOI:10.1007/s10098-017-1353-x.
4. H.O. Njoku, O.V. Ekechukwu and S.O. Onyegegbu (2016) Normalized charging exergy performance of stratified sensible thermal stores. Solar Energy, 136: 487{498, DOI:10.1016/j.solener.2016.07.032.
5. H.O. Njoku, O.V. Ekechukwu and S.O. Onyegegbu (2016) Comparison of energy, exergy and entropy generation-based criteria for evaluating stratified thermal store performances. Energy and Buildings, 124: 141-152, DOI:10.1016/j.enbuild.2016.04.062.
6. H.O. Njoku (2016) Upper-limit solar photovoltaic power generation: Estimates for 2-axis tracking collectors in Nigeria. Energy, 95(1): 504{516, DOI:10.1016/j.energy.2015.11.078.
7.S.N. Ugwu, B.O. Ugwuishiwu, O.V. Ekechukwu, H. Njoku, A.O. Ani (2015) Design, construction, and evaluation of a mixed mode solar kiln with black-painted pebble bed for timber seasoning in a tropical setting. Renewable and Sustainable Energy Reviews, 41(1): 1404{1412, DOI:10.1016/j.rser.2014.09.033.
8.D.I. Egeonu, H.O. Njoku, S.O. Enibe (2014) Sky conditions at Nsukka as characterized by clearness index and cloudiness index. International Journal of Scientific Research and Innovative Technology, 1(5): 67-82,http://www.ijsrit.com/uploaded_all_files/3271426382_z5.pdf.
9. H.O. Njoku, O.V. Ekechukwu and S.O. Onyegegbu (2014) Analysis of stratified thermal storage systems: An overview. Heat and Mass Transfer, 50(7): 1017{1030, DOI:10.1007/s00231-014-1302-8.
10.P.U. Akpan, H. Yeung, S. Jones, H. Njoku and C.A. Mgbemene (2014) Mathematical models of airvessels for pressure transient control in water pipelines { a review. International Journal of CurrentResearch, 6(2): 5267{5272, http://wwww.journalcra.com
11. H.O. Njoku (2014) Solar Photovoltaic Potential in Nigeria. ASCE Journal of Energy Engineering, 140(2): 04013020, DOI:10.1061/(ASCE)EY.1943-7897.0000145.
12. H.O. Njoku and O.V. Ekechukwu (2011) Thermal performance of the reverse-side absorber-plate shallow solar pond. Applied Solar Energy, 47(3): 213-220, DOI:10.3103/S000 3701X11030145.
13. H.O. Njoku and O.V. Ekechukwu (2011) Analysis of the exergeticperformance of the reverse-side absorber-plate shallow solar pond. International Journal of Sustainable Energy, 30(6): 336{352, DOI:10.1080/1478646X.2010.515742.
14.G.U. Akubue, H.O. Njoku and G.O. Unachukwu (2011)Exergetic performance evaluation of an improved single slope solar still. Nigerian Journal of Solar Energy, 22: 26{30.
15.S. O. Enibe, C. P. Asiegbu and H.O. Njoku (2011) Continuous-flowdepulping machine for treculiaAfricana. Global Journal of Engineering Research, 10(1&2): 77-103,http://www.globaljournalseries.com/.
16. H.O. Njoku, O.V. Ekechukwu and A.O. Odukwe (2009) Comparative study of the effect of depth and season on the performance of the reverse-side absorber-plate shallow solar pond in the Nsukka climate. International Journal of Sustainable Energy, 28(4): 203{215, DOI:10.1080/14786450903194510.
Contributed Chapters in Books:
1.O.V. Ekechukwu, H.O. Njoku and S.O. Onyegegbu (2013) Energy and Exergy Performance Analysis of Heat Storage Systems. Chapter 8 of Energy: Modern Energy Storage, Conversion, and Transmission in the 21st Century, Lars Rose Ed., Nova Publishers, New York, USA.
2. H.O. Njoku (2013) Basic Data Handling and Plotting with Scilab. Chapter 11 of MATLAB/SCILAB for Scientific and Engineering Systems Analysis, S.O. Enibe Ed., NASAO, Nsukka, Nigeria.
Contributions to Conference Proceedings:
1.I.E. Darlington, H.O. Njoku, P.N. Okolo and S.O. Enibe (2014) Comparative Assessment of Temperature Based ANN and Angstrom Type Models for Predicting Global Solar Radiation. In Proceedingsof First International Afro-European Conference for Industrial Advancement AECIA 2014, SpringerInternational Publishing, Eds: Ajith Abraham, PavelKrmer and Vaclav Snasel, pp.109{122, DOI:10.1007/978-3-319-13572-4 9.
2. H.O. Njoku (2014) The OpenFOAM CFD toolbox on Lion Grid. Invited paper presented at the Workshop on Grid Computing User Applications for Academics and Research Communities, held on 8th July 2014 at the MTN Connect, NnamdiAzikiwe Library, University of Nigeria, Nsukka.
3. H.O. Njoku (2013) Estimating the Performance of Photovoltaic Systems in Nigeria. Poster presentation at the School on Hands-On Research in Complex Systems held from 1 to 12 July, 2013 at the Abdus Salam - International Centre for Theoretical Physics, Miramire-Trieste, Italy.
4. H.O. Njoku, F.C. Ezeokoye and C.K. Olua (2012) Electricity Generation Potentials of PV Systemsin Nigeria: Estimations based on Online Open-Access Data. Paper presented at the Solar Energy Society of Nigeria National Solar Energy Forum (NASEF) 2012, held at National Centre for Energy and Environment, University of Benin, Benin-City, from 12{16 Nov, 2012.
5.O.V. Ekechukwu, H.O. Njoku and G.U. Akubue (2011) Measured Performances of an Augmented [Double Exposure Absorber-Plate] Single-Slope Solar Still. Inproceedings of 30th ISES Biennial SolarWorld Congress 2011, Kassel, Germany from 28 August - 2 September 2011, Ed: K. Vajen, Vol. 2, pp. 867-878.
6.G.U. Akubue, H.O. Njoku, S.U. O_ah and G.O. Unachukwu (2010) Performance evaluation of an improved single slope solar still. Paper presented at the 2nd International Workshop on Renewable Energy for Sustainable Development in Africa, held at the Ritz Continental Hotel Abuja between 27-28 July 2010.


Conferences and Workshops
Membership of professional bodies
Research Interest
Working Experience