Abstract
Abstract Marine diesel engines lose a huge amount of fuel heat content in the form of exhaust gas and jacket cooling water, especially onboard high-powered marine vehicles such as Ro-Pax ships. In this paper, the possibility of using the waste heat of marine diesel engines as a source of heat for air conditioning absorption system is investigated. The thermodynamic analysis, in addition to the environmental and economic analysis of the air condition absorption cycle operated with two heat sources using lithium bromide as absorbent, are performed using the Engineering Equation Solver (EES) software. The last 10 years have seen a steady growth in the passenger ferry and Ro-Pax market, with particularly strong growth in passenger numbers. As a case study, a Ro-Pax vessel operating in the Red Sea area is considered, regarding the profitability of using air conditioning absorption system. The results show specific economic benefits of the jacket cooling water operated absorption refrigeration unit (ARU) over the exhaust gas operated unit, with annual costs of capital money recovery of 51,870 $/year and 54,836 $/year, respectively. Environmentally, applying an ARU machine during cruising will reduce fuel consumption by 104 ton/year. This, in turn, will result in reducing NOx, SOx, and CO2 emissions with cost-effectiveness of 7.73 $/kg, 20.39 $/kg, and 0.13 $/kg, respectively.
Highlights
For the year 2012, total shipping emissions were approximately 938 million tonnes CO2 and 961 million tonnes CO2 equivalent (CO2e) for GHGs combining CO2, CH4 and N2O
This paper presents the thermodynamic analysis of a singleeffect water-lithium bromide absorption refrigeration machine, starting with the cycle description and validation
The results compare the performance of two absorption refrigeration unit (ARU) waste heat recovery systems
Summary
For the year 2012, total shipping emissions were approximately 938 million tonnes CO2 and 961 million tonnes CO2e for GHGs combining CO2, CH4 and N2O. The exit low- pressure steam of the evaporator is absorbed into strong lithium-bromide solution coming from the generator by rejecting the heat energy (Qa) to the cooling medium. The solver has the built-in functions of thermodynamic properties of steam and water-lithium bromide mixtures It performs multiple iterations using the mass and energy balance equations to determine the values of enthalpy (h) and mass flow rate (m) at each point of the absorption cycle based on the input data. The main input parameters were: cooling capacity equal to 11 kW, temperatures of the generator, absorber, condenser, and evaporator, equal to 90oC, 34.9oC, 30oC, and 6.7oC, respectively, strong and weak mass fractions amounting to 60% and 55.5% respectively, and the heat exchanger effectiveness equal to 60%.
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