Nguyen, M.P., Hoang, T.T.H., Le, T.T. and Trinh, T.T. 2016. Prediction in off-design operation for the helical heat recovery exchanger. CTU Journal of Innovation and Sustainable Development . Renewable Energy (Jul. 2016), 46-51. DOI:https://doi.org/10.22144/ctu.jsi.2016.007.