Abstract
In order to solve the problems of energy shortage and environmental pollution, a waste heat driven seawater desalination system is proposed here in which the waste heat from the exhaust gas and coolant of the onboard diesel engine of a fishing boat is recovered to drive a membrane-based air humidification–dehumidification seawater desalination system to supply fresh water for the crews. An experimental platform is designed and constructed to evaluate the system performance. A complete model for the whole system is developed and validated. The system parameters are optimized through particle swarm optimization method to have a better performance. It is found that the thermal and exergy efficiencies of the system varies with the diesel engine load. The maximum thermal efficiency, freshwater production rate, specific water production rate per unit area of membrane, and production consumption ratio (fresh water production to fuel consumption) are 48.16 %, 64.5 kg/h, 2.36 kg/(h·m2), and 1.12, respectively. Most of the exergy losses occur in the heat recovery exchangers and coolers, which could be further perfected to improve system performance. The fishing boat field demonstration indicates that the system is feasible and possible for addressing the problems of fishing boat waste heat recovery and desalination.
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