Browsing by Author "Ramesh, U. S."

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A study on the seasonal variability of nearshore waves off Visakhapatnam, east coast of India
(International Journal of Innovative Research and Development, 2012-12) Suresh, R. R. V.; Patnaik, K. V. K. R. K.; Ramesh, U. S.; Misra, S. C.
Wave rider buoy data during the period June 2009 to May 2010 was analyzed to examine the seasonal trends in the nearshore waves off Visakhapatnam, east coast of India. During fair weather conditions, wave heights were observed to be higher in the southwest monsoon season with maximum significant wave height (Hs) of about 2.76m in the month of July and average Hs of about 1.6m. The higher values of spectral band width emphasize that the wave heights covered a wide range for major period of the year. A large standard deviation of swell period represents the occurrence of distant swell in a wide range to the study region. The seasonal cycle of wave heights off Visakhapatnam, East Coast of India is dominated by SW monsoon winds. The waves at study area are resultant of sea and large swells from south of Bay of Bengal
Analysis of antifouling paints using drum test apparatus
(RINA, 2015-12) Joshi, Madhu; Mukherjee, A.; Misra, S. C.; Ramesh, U. S.
Ship has been recognized as a major factor in introduction of non-native and harmful organisms which causes deleterious effects on the performance of the vessel. More than 70% of Invasive species worldwide have found to be due to hull fouling. To mitigate fouling, underwater parts of the vessels are coated with antifouling paints. Antifouling paints provide foul-free hulls up to a maximum of 95 % of the vessels underwater area. There are a number of types of these paints but “self-polishing coatings” are predominantly preferred by the shipping industry. In these types of coatings, a thin layer of biocide containing paint (typically 2 to 5 microns/month) is leached or “polished” away. This polishing action primarily depends on the hydrodynamic surface forces on the vessels hull. The higher the fluid velocity, the higher are the polishing rate. Certain areas of the vessel such as near the bow, stern, etc experience higher fluid velocity and therefore higher polishing rates thereby resulting in premature fouling. Conversely, areas where the flow rates are considerably smaller would experience lesser polishing rates which would result in insufficient amount of biocides being delivered which would again result in premature fouling. In order to study and estimate the polishing rates of Anti Fouling paint we have designed, fabricated a rotating drum test facility .Wall shear stress are to be calculated by CFD methods
Anifouling paint schemes to minimize the risk of transmigration of invasive species
(Sixteenth National Congress on Corrosion Control, 2012-08) Mukherjee, A.; Joshi, Madhu; Misra, S. C.; Ramesh, U. S.
Biocorrosion or biofouling on ships hull occurs to the attachment of barnacles, mollusks and Other aquatic organisms on the surface of ships which leads to increase in fuel consumption, reduction of the vessels speed, premature failure of the hull, etc. Recent developments in antifouling paints, in general, prevent fouling in about 95% percent of the vessels underwater surface, which ship operators find satisfactory as far as the routine vessel operation is concerned. However, this is not sufficient enough to prevent the transport or invasion of alien species which result in numerous environmental issues that include reduction and extinction of native species and thereby seriously disrupting the natural ecosystems. Virtually all ocean going vessels are coated with antifouling paints, predominant among them are “Self polishing coatings” and “Foul Release Coatings”. Both these coatings depend on hull shear forces caused by the motion of the vessel, by different mechanisms, to result in the hull to be essentially foul-free. Currently hulls are coated with a uniform layer of antifouling paints. However, CFD analysis conducted on various types of vessels have shown highly non-uniform wall stress distribution along the vessels hull. This results in premature paint failure for “Self polishing Coatings” and insufficient shear forces for “Foul release coatings” to release the attached fouling organisms. Both these factors contribute significantly to the transmigration of invasive species. Preliminary results of the current work indicate that certain areas of the vessel such as such as bow thrusters, sea chest, stern tube, rudder etc. are the likely areas to be heavily fouled thereby warranting special attention in such areas. Solutions to these issues include alternative paint schemes/formulations in the identified niche areas to account for non-uniform shear and polishing of paints. Such schemes would ultimately reduce the risk of transmigration of invasive species
Antifouling paint schemes for green ships
(Ocean Engineering, 2019) Mukherjee, A.; Madhu, Joshi; Misra, S. C.; Ramesh, U. S.
Recent advances in antifouling (AF) paints in general prevent fouling in about 95% of the vessel's immersed surface. However the remaining area which amounts to 5% or less of the total area does get fouled. Although this level of fouling has marginal impact on the routine performance of the vessel it is a predominant vector for the transmigration of invasive species which is now a serious environmental concern. Virtually all ocean going vessels are coated with antifouling paints predominant among them are “Self polishing coatings”. CFD analysis conducted on various types of vessels have indicated that there are certain “hotspots” where the polishing rates are exceedingly high and would polish the AF paints at a much faster rate and ultimately result in the failure of the AF coating. A possible solution to this issue is to first identify these hotspots and suitable paint schemes/formulations are to be applied in such areas. An experimental procedure utilizing a “drum-test” apparatus can be used to compute the coating thicknesses based on wall shear stresses. Such painting schemes would prevent the premature failure of the AF coating in general and significantly reduce the risk of transmigration of invasive species in particular.
Bio diesel as an alternative fuel for maritime transport
(Indian Maritime University, 2011-09-30) Misra, S. C.; Ramesh, U. S.
Movement of goods through seaways and rivers is one of the most energy efficient modes of transportation. Majority of the ships and boats in maritime transportation use Diesel engines for propulsion and power requirements burning a variety of grades of fossil fuel. However with the advent of the concept of sustainable environment, this industry is also looking towards improving its energy efficiently and environment friendliness. This paper outlines the regulatory requirements for fuels and emissions from diesel engines from ships operating in international trade. While Bio Diesel is one of the alternatives for reduction of maritime emissions due to its very low or negligible sulphur content and amenability to complete combustion, its testing in a marine environment in India is limited. The paper gives an overview of some of the results of studies conducted internationally on the use of Bio Diesels in marine transportation. An estimate of requirement of biodiesel for Coastal shipping in India is presented. The paper stresses the need for increased testing of Biodiesel blends in marine engines to quantify the benefits and cost implications for use in coastal and river movement of cargo and passengers.
Comparative study for resistance of a bulk carrier using CFD
(Altair Technology Conference, 2013-07) Bhavaraju, Pradeep J. S.; Revathi, Ch.; Ramesh, U. S.
The hydrodynamic performance of a vessel depends on the shape of the hull. Therefore it is important that the hull form be carefully designed to minimize pressure distribution and resistance. A CFD analysis for the full scale bulk carrier is made to estimate the resistance at different velocitie . A 3D steady state, incompressible viscous flow analysis for 8, 12 and 14 knots at 7.8 m draft level is executed for zero offset flow angle using the CFD package ACUSOLVE and the results are compared with experimentally obtained model test results. An attempt is made to simulate free surface interaction between the bulk carrier and water using the Smooth Particle Hydrodynamics method available in RADIOSS solver.
Control of bio corrosion to prevent the propagation of invasive species
(National Corrosion Council of India (NCCI), 2010-09-16) Madhu, Joshi; Mukherjee, A.; Misra, S. C.; Ramesh, U. S.
Biocorrosion or biofouling on ships hull occursdue to the attachment of barnacles, mollusks and other aquatic organisms on the surface of ships which leads to increase in fuel consumption, reduction of the vessels speed, premature failure of the hull, etc. Recent developments in antifouling paints, in general, prevent fouling in about 95% percent of the vessels underwater surface, which ship operators find satisfactory as far as the routine vessel operation is concerned. However, this is not sufficient to prevent the transport or invasion of alien species. In recent years the issue of invasive marine species has been receiving considerable attention due to the fact that introduction of nonidegenous species or non-native species transmigrated from other areas to coastal waters often results in the reduction and even extinction of the native species and thereby severely disrupting the natural marine ecosystems. The predominant vector for the transport of nonindigenous species in marine environments has been shipping. While ballast water receives the most attention, hull fouling is now considered to be the most significant means for translocation of these organisms. For example, 90 percent of the 343 marine alien species in Hawaii are thought to have arrived through hull fouling. Certain niche areas of the vessel such as bow thrusters, sea chest, stern tube, rudder etc. are the likely areas to be heavily fouled. In addition, the other areas that are likely to be fouled are on locations where antifouling paint has been worn of due to excessive shear and bending of the hull. This paper reviews the various antifouling strategies and aims identify areas on the hull surfaces of certain classes of vessels that are prone to fouling by excessive shear and bending and identify suitable antifouling treatments to further reduce the risk of transportation of alien species.
Control of biocorrosion to prevent the propagation of invasive species
(Indian Maritime University, Chennai, 2010-09) Joshi, Madhu; Mukherjee, A.; Ramesh, U. S.; Misra, S. C.
Biocorrosion or biofouling on ships hull occursdue to the attachment of barnacles, mollusks and other aquatic organisms on the surface of ships which leads to increase in fuel consumption, reduction of the vessels speed, premature failure of the hull, etc. Recent developments in antifouling paints, in general, prevent fouling in about 95% percent of the vessels underwater surface, which ship operators find satisfactory as far as the routine vessel operation is concerned. However, this is not sufficient to prevent the transport or invasion of alien species. In recent years the issue of invasive marine species has been receiving considerable attention due to the fact that introduction of nonidegenous species or non-native species transmigrated from other areas to coastal waters often results in the reduction and even extinction of the native species and thereby severely disrupting the natural marine ecosystems. The predominant vector for the transport of nonindigenous species in marine environments has been shipping. While ballast water receives the most attention, hull fouling is now considered to be the most significant means for translocation of these organisms. For example, 90 percent of the 343 marine alien species in Hawaii are thought to have arrived through hull fouling Certain niche areas of the vessel such as bow thrusters, sea chest, stern tube, rudder etc. are the likely areas to be heavily fouled. In addition, the other areas that are likely to be fouled are on locations where antifouling paint has been worn of due to excessive shear and bending of the hull. This paper reviews the various antifouling strategies and aims identify areas on the hull surfaces of certain classes of vessels that are prone to fouling by excessive shear and bending and identify suitable antifouling treatments to further reduce the risk of transportation of alien species.
Control of biocorrosion to prevent the propagation of invasive species
(Indian Maritime University, Chennai, 2010-09) Joshi, Madhu; Mukherjee, A.; Ramesh, U. S.; Misra, S. C.
Biocorrosion or biofouling on ships hull occursdue to the attachment of barnacles, mollusks and other aquatic organisms on the surface of ships which leads to increase in fuel consumption, reduction of the vessels speed, premature failure of the hull, etc. Recent developments in antifouling paints, in general, prevent fouling in about 95% percent of the vessels underwater surface, which ship operators find satisfactory as far as the routine vessel operation is concerned. However, this is not sufficient to prevent the transport or invasion of alien species. In recent years the issue of invasive marine species has been receiving considerable attention due to the fact that introduction of nonidegenous species or non-native species transmigrated from other areas to coastal waters often results in the reduction and even extinction of the native species and thereby severely disrupting the natural marine ecosystems. The predominant vector for the transport of nonindigenous species in marine environments has been shipping. While ballast water receives the most attention, hull fouling is now considered to be the most significant means for translocation of these organisms. For example, 90 percent of the 343 marine alien species in Hawaii are thought to have arrived through hull fouling Certain niche areas of the vessel such as bow thrusters, sea chest, stern tube, rudder etc. are the likely areas to be heavily fouled. In addition, the other areas that are likely to be fouled are on locations where antifouling paint has been worn of due to excessive shear and bending of the hull. This paper reviews the various antifouling strategies and aims identify areas on the hull surfaces of certain classes of vessels that are prone to fouling by excessive shear and bending and identify suitable antifouling treatments to further reduce the risk of transportation of alien species.
Control strategy for fuel saving in asynchronous generator driven electric tugboats
(IEEE, 2016-12) Anil Kumar, B.; Anil Kumar, K.; Radha, T.; Chelliah, Thanga Raj; Khare, Deepak; Ramesh, U. S.
Usually electric tugboats are equipped with diesel engine based electric generator for power production, battery for supplying power to auxiliary loads and electric motors for propulsion. This paper proposes control strategies for diesel engine and electric generators used in electric tugboat to improve energy efficiency of the system. Doubly fed induction machine (DFIM), asynchronous in nature, is considered in this research which serves as generator (power production). The speed of diesel engine is controlled in accordance with the power demanded by the tug. Output voltage and frequency of generator during sub-synchronous operation are regulated by controlling its rotor current with the help of power electronic convertors. Comparison of fuel consumption at fixed and variable speeds of operation is performed. From the test results, it is observed that the variable speed operation of diesel generator offers significant reduction in fuel consumption.
Control strategy for fuel saving in asynchronous generator driven electric tugboats /
(IEEE, 2016-01-01) Ramesh, U. S.
Usually electric tugboats are equipped with diesel engine based electric generator for power production, battery for supplying power to auxiliary loads and electric motors for propulsion. This paper proposes control strategies for diesel engine and electric generators used in electric tugboat to improve energy efficiency of the system. Doubly fed induction machine (DFIM), asynchronous in nature, is considered in this research which serves as generator (power production). The speed of diesel engine is controlled in accordance with the power demanded by the tug. Output voltage and frequency of generator during sub-synchronous operation are regulated by controlling its rotor current with the help of power electronic convertors. Comparison of fuel consumption at fixed and variable speeds of operation is performed. From the test results, it is observed that the variable speed operation of diesel generator offers significant reduction in fuel consumption.
Development of autonomous dredger for inland waterways and enclosed water bodies
(EADA(I) Silver Jubilee Seminar, 2018-03-15) Pavan Kumar, G. V. V.; Ramesh, U. S.; Sivakholundu, K. M.
The conceptual layout of the proposed autonomous dredger is presented. The potential for dredging in inland water bodies - reservoirs and inland waterways – in India is five times larger than the conventional dredging (ports and channels). Unlike arine dredgers, these small dredgers cannot be directly scaled up due to restrictions imposed by transportation, environmental conditions, draft and deployment. To overcome some of the difficulties, Indian Maritime University at Visakhapatnam campus IMU[V] is working on the development of an Autonomous Dredger (AD). The design philosophy revolves around modularity, ase of transport and autonomous operation. Modularity will ensure that the dredger can be dismantled for road transport and assembled at dredge site with minimal handling machinery. AD is being designed for calm water operations with four point mooring support and meant for clay and sand removal by water jet based dredging. The autonomous operation will ensure unattended dredging operation on 24x7 basis. The AD will have an in-built bathymetric survey system that will provide pre and post dredging quantification. While deployment the overall reservoir site will be divided into small ‘cell’ of convenient size (say 100 x 100m). After deployment, the AD will survey, dredge and verify the work done autonomously within the cell. Manual intervention for operational purpose will be kept to a minimum for shifting the AD from one cell to next.
Energy management and charging portfolio analysis for future battery powered harbor vessels /
(IEEE, 2023-05-11) Ramesh, U. S.
This article intends to provide key insights to the marine designers and port authorities for adapting battery-operated zero emission electric harbor vessels (ZEE-HVs) and plan the resources for charging infrastructure. The present study is a cumulatively coordinated analysis of various significant aspects concerning the adaptation of ZEE-HVs for short-endurance commercial maritime operations. The sizing of onboard battery energy systems (OBES) is discussed for different short-endurance ZEE-HVs by considering the speed-resistance characteristics of the hull and open-water characteristics of the propeller without limiting their operations for specific load profiles/operating cycles. Charging portfolio selection is critical for a marine vessel as the OBES size is several times higher than a regular electric vehicle's battery. Hence charging portfolio selection criteria are presented to select a suitable battery charging protocol for each ZEE-HV as per the OBES ratings and available idle times on a typical day. Since the port is a commercial spot, uncertainty in resource planning leads to penalties and loss of goodwill. Therefore, Monte Carlo-based iterative analytical method is adopted to forecast the ZEE-HVs' maximum possible charging power demand on a typical day. By the load forecast data, optimal sizing of the load peak shaving battery (LPSB) was performed to limit load fluctuations at the port grid. The synergy of ZEE-HVs with LPSB and bi-directional charge-discharge controller is pivotal for effectively administering the seaport shore charging facility, which is demonstrated for a typical energy management cycle.
Energy management and charging portfolio analysis for future battery powered harbor vessels /
(IEEE, 2020-12-16) Ramesh, U. S.
The growth in Battery Powered Harbor Vessels (BPHV) signifies the necessity for a study on charging infrastructure and energy management at the seaport. This paper analyzes the charging portfolio specifications and energy management for different types of prospective BPHV at Visakhapatnam port. A brief study was conducted to identify the suitable charging method for regularly operated BPHV like Mooring Launch (ML), Pilot Launch (PL), Fishing Vessel (FV), and Tug Boats (TB). An iterative analytical study is characterized to forecast the BPHV charging load demand over a 24-hour duration and performed optimal sizing of Shore Battery Bank (SBB) to shave the critical load peaks and limit load fluctuations at the port grid. The energy management at the prospective seaport charging infrastructure is presented with relevant results by discussing the significance of Active Line Conditioner (ALC) and Bidirectional DC-DC Converter (BDC).
Energy saving strategy on electric propulsion system integrated with doubly fed asynchronous motors
(IEEE, 2016-11) Singh, Raja R.; Chelliah, Thanga Raj; Khare, Deepak; Ramesh, U. S.
Electric propulsion system integrated with doubly-fed asynchronous motor contributes efficient characteristics and flexibility in operation. However, in perception of energy saving and full-scale speed variation, the conventional doubly fed asynchronous motor is limited by the ratings of power converters. Generally, the electrical machines are designed to attain maximum efficiency around the full load. To increase energy saving and operating speed range under lightly loaded condition, the proposed strategy injects a low voltage DC supply to the stator winding instead of full rated AC supply. Wherein the DC supply is obtained from the converter's DC-link instead of external source. The proposed system is mathematically modelled using Matlab/Simulink tool and implemented experimentally with a 2.2 kW doubly fed asynchronous motor. In addition to this, the comparative energy conservation analysis of an electric propulsion system (2 MW) with the proposed strategy is carried out as a case study.
Environmentally friendly antifouling paints and painting schemes
(International Journal of Innovation Research & Development, 2012-12) Joshi, Madhu; Mukherjee, A.; Misra, S. C.; Ramesh, U. S.
Since the 1970's Tributyl tin based antifouling paints were widely used to control fouling on ships hulls. These coatings offered up to 5 years of foul-free hulls and were the most effective antifouling paints ever produced. However, due to serious environmental effects, these paints have been banned since 2008 and have been replaced by copper based antifouling paints with some success. However, the extensive use of copper based antifouling paints has led to the accumulation of cooper and its compounds in the marine environment particularly in the vicinity of ports and harbors and is beginning to pose a serious environmental problem. This paper explores the possibility of incorporating environmentally friendly biocides in antifouling paints that exhibit a low persistence in the marine environment particularly those biocides that are available in the Indian context. Another serious problem facing the marine environment is the issue of Invasive species. In recent years the issue of invasive marine species has been receiving considerable attention due to the fact that introduction of non indegenous species or non-native species transmigrated from other areas to coastal waters often results in the reduction and even extinction of the native species and thereby severely disrupts the natural marine ecosystems. The predominant vector for the transport of nonindigenous species in marine environments has been shipping. While ballast water receives the most attention, hull fouling is now considered to be the most significant means for translocation of these organisms. Certain niche areas of the vessel such as bow thrusters, sea chest, stern tube, rudder etc. are the likely areas to be heavily fouled. Although this fouling does not affect the overall performance of the vessel, would however, be a vector for the transportation of Invasive species. In addition, the other areas that are likely to be fouled are on locations where antifouling paint has been worn of due to excessive shear and bending of the hull. This paper attempts to identify such areas using CFD simulations and suggest that special paint schemes must be incorporated in these niche areas.
Failure analysis of antifouling paints on ships hull
(NISCAIR-CSIR, India, 2014-11) Joshi, Madhu; Mukherjee, A.; Misra, S. C.; Ramesh, U. S.
Fouling on ships hull occurs due to the attachment of barnacles, mollusks and other aquatic organisms on the underwater area of the hull. This leads to increased drag, fuel consumption, resulting in unscheduled dry-docking. Recent advances in antifouling (AF) paints, in general, offer protection against fouling in about 95 % of the vessels immersed surface. However, the remaining area which amounts to 5% or less of the total area does get fouled. Although this level of fouling has marginal impact on the routine performance of the vessel, it is a predominant vector for the transmigration of invasive species which is a serious environmental concern. Virtually all ocean going vessels are coated with antifouling paints, predominant among them are “Self polishing coatings”. These coatings depend on the shear forces on the hull surface caused by the motion of the vessel for the paint to “polish” away and release a biocide at a predetermined rate that results in the hull to be essentially fouling free. Currently hulls are coated with a uniform layer of antifouling paints. However, computational fluid dynamics (CFD) analysis conducted on various types of vessels have indicated that there are certain “hotspots” where shear stresses and therefore the polishing rates are exceedingly high which would polish the AF paints at a much faster rate and ultimately result in the failure of the AF coating. The analysis also indicates that these hotspots primarily depend on the profile of the vessels, its speed and its draft. The current practice of a uniform coat of AF paint does not take into account the fact that there are certain areas of the vessel where the polishing rates are excessive. A possible solution to this issue is to first identify these hotspots and suitable paint schemes/formulations are to be applied in these areas. Such painting schemes would prevent the premature failure of the AF coating in general and significantly reduce the risk of transmigration of invasive species.
Improved fuel-use efficiency in diesel–electric tugboats with an asynchronous power generating unit
(IEEE Transactions On Transportation Electrification, 2019) Anil Kumar, Birudula; Raghu, Selvaraj; Thanga Raj, Chelliah; Ramesh, U. S.
High capacity diesel–electric tugboats are employed at every modernized harbor for assisting big marine vessels and other harbor applications. Contemporary tugboats use multiple power sources to meet their propulsion and auxiliary on-board load demands. The effective utilization of multiple power sources leads to better fuel use efficiency with reduced emissions, economic, and environmental benefits. This paper presents a simple optimization technique for scheduling available power sources of a diesel–electric tugboat [diesel engine generators (DEGs) and batteries] to meet its load demand with an objective to minimize fuel consumption. For this paper, a diesel–electric tugboat system of 1.1-MW capacity with different generating systems is considered: 1) fixed speed generating unit (2 × 550 kW fixed speed DEG employing synchronous generators) and 2) variable speed generating unit [1×1.1 MWvariable speed DEG employing doubly fed induction generator (DFIG)]. From the optimized test results, it is inferred that the variable speed generating unit offers a fuel saving of 29.86% in comparison with diesel-mechanical propelled system and 2.9%in comparison with fixed speed diesel– electric system. The simulation of a 1.1-MW variable speed generating system is performed in MATLAB/Simulink 2014A environment, and experimental demonstration is performed through a 2.2-kW laboratory prototype
Improved Fuel-Use Efficiency in Dieselâ€“Electric Tugboats With an Asynchronous Power Generating Unit
(IEEE, 2019-03-20) Ramesh, U. S.
High capacity diesel-electric tugboats are employed at every modernized harbor for assisting big marine vessels and other harbor applications. Contemporary tugboats use multiple power sources to meet their propulsion and auxiliary on-board load demands. The effective utilization of multiple power sources leads to better fuel use efficiency with reduced emissions, economic, and environmental benefits. This paper presents a simple optimization technique for scheduling available power sources of a diesel-electric tugboat [diesel engine generators (DEGs) and batteries] to meet its load demand with an objective to minimize fuel consumption. For this paper, a diesel-electric tugboat system of 1.1-MW capacity with different generating systems is considered: 1) fixed speed generating unit (2 × 550 kW fixed speed DEG employing synchronous generators) and 2) variable speed generating unit [1×1.1 MW variable speed DEG employing doubly fed induction generator (DFIG)]. From the optimized test results, it is inferred that the variable speed generating unit offers a fuel saving of 29.86% in comparison with diesel-mechanical propelled system and 2.9% in comparison with fixed speed diesel- electric system. The simulation of a 1.1-MW variable speed generating system is performed in MATLAB/Simulink 2014A environment, and experimental demonstration is performed through a 2.2-kW laboratory prototype.
Improving the efficiency of marine power plant using stirling engine in waste heat recovery systems
(International Journal of Innovation Research & Development, 2012-12) Ramesh, U. S.; Kalyani, T.
Energy seems to be the subject at the heart of many of the greatest issues and debates facing the world today. Global warming is a huge issue that promises to change the face of the planet in unimaginable and irreversible ways. This alone is considered as a major driving factor in development of energy efficient technologies for various purposes including marine transportation for sustainable development. The predominant source of power in a ship is the Diesel engine which has evolved as a highly efficient means of generating necessary power for propulsion and auxiliary uses However it is widely recognized that about 30% of the total energy converted in a Diesel engine is rejected in the exhaust gas. . On large ships some of this heat is recovered partly using exhaust gas boilers. However on a majority of small ships or on large ships on short voyage durations, there is no or limited mechanism to recover this energy. The recently mandated energy efficiency design index (EEDI) has the provision to deduct the power produced from any energy saving device thereby giving credit to the design. While some of the energy saving devices being contemplated, use wind and solar power, it is being recognized that some of the energy from the engine exhaust gases and cooling water can still be tapped to generate power resulting in improved energy efficiency of the plant. One of the ways of utilizing waste heat without conversion to steam is to use a Stirling engine. A Stirling engine requires only an external heat source (such as external combustion chamber or waste heat) for its operation. For marine use this engine could be utilized to generate some amount of power from the exhaust gas. This paper advocates the use of heat balance studies for improving the efficiency of the marine power plant. An estimation of the power which could be generated from a Stirling engine is presented based on estimation of the power which could be produced from the exhaust gas of a high speed (560 KW) propulsion engine and expected savings in fuel.