Optimisation of solar desalination process : an investigation of the critical parameters affecting solar still water production in the context of a developing country : dissertation in fulfilment of the Master of Engineering degree requirements (Mechanical) / student: Alexander Gorrie, University of Canterbury ; primary supervisor: Dr Dirk Pons, University of Canterbury ; secondary supervisor: Dr Paul Docherty, University of Canterbury ; secondary supervisor: David Maples, Ara Institute of Canterbury ; industry client: John Wilson, Sunshine Solar.