5500 TEU CONTAINER VESSELS (ANS SERIES)

Transcription

1 E N E R G Y S A V I N G B Y L I G H T I N G Lighting using LED and Solar Power 5500 TEU CONTAINER VESSELS (ANS SERIES) Courtesy MSC Navgathi has been in the energy saving business for the past five years designing and building solar boats & ferries. NAVGATHI MARINE India * S.Korea * UAE W: E: nav@navgathi.com 1

2 1. Case Study for LED Replacement Executive Summary Energy saving through ligh1ng is by far the most effec1ve means of return on investment for a shipowner - less than two years. In addi1on it is one of the few methods where there is a clear means of measuring the benefits of installa1on - electric power can be accurately measured. This case study discusses the replace- ment of fluorescent tubes (4 B and 2 B) with the LED equivalent (in the same fihng) as well as engine room flood lights with induc1on lights. The significant reduc1on in power consump1on (one- third) and extended life (six 1mes) ensures a huge savings for the ship owner. Lights Summary The summary of lights of different types for this container vessel are shown below. LIGHTS NO. OF LIGHTS ORIGINAL RAT- ING (WATT) ECO-LIGHTS RATING (WATT) ECO-LIGHTS AS % OF ORIGINAL 4 B Tubes * % 2 B Tubes * % Flood Lights 5 580* % * The above rating is actual measured one. For instance 40 W rated tubes actually consume 47 W Cost of Power The cost of power on a ship is the total opera1ng cost of producing the electric power. Since the electric generator is not replaced and significant change in maintenance is not expected, only the reduc1on in fuel oil and lubrica1ng oil is factored in the cost of power es1ma1on. For this container vessel the generator, each 1800 kw ra1ng, is running at 1200 kw load (66% MCR 1 ) where SFOC 2 is the high - and hence cost of power is the high. For this generator with SFOC of 210 g/kwh of engine power corresponds to 221 g/kwh of electrical power. Taking IFO 380 cos1ng US$ 600/tonne 3, the cost of electric power comes to US$ 0.15/kWh in best case sce- nario and US$ 0.18/kWh as likely scenario. LED Saving Taking the above table showing difference in wa`age and the cost of electric power it can be seen below that the difference in cost will break even in less than one year. For five years the increase in F.O cost at 10% per year is taken. 1 Maximum Continuos Rating 2 Specific Fuel Oil Consumption in g/kwh 3 1

3 ECO LIGHTS COST DIFFERENCE IN / 1000 / 5 RATING (WATT) HRS /YEAR YEARS 4 B Tubes B Tubes Flood Lights ,848 The above does not factor the shorter life of normal tubes hrs (one year if run 24 hrs/day) compared to six times for LED Measurement One must take the advantage of precision in measuring electric power and thereby the benefit by installing energy meters in the ligh1ng circuit. In this series the first vessel is installed with four units to monitor the benefit. The readings are automa1cally transferred to computer and savings can be monitored. Process A vessel visit was done to finalise the proposal (needed only on one vessel in sister vessel series) including number of fihng, ra1ng and no. of energy meters. Once the proposal was accepted our team of three en- gineers will visit on board to install energy meters, replace the lights and replace some fihngs which showed earth fault. Consumption A summary of savings in energy and opera1ng cost is shown below. LIGHTS DIFFER- ENCE IN RATING (WATT) NO. OF LIGHTS AVERAGE RUNNING HRS /DAY (KWH) SAVING S/YEAR (KWH) /YEAR IN 5 YEARS 4 B Tubes * ,701 2 B Tubes * ,983 Flood Lights ,659 18, ,366 22, ,839 23, ,844 28, ,412 2,799 17,087 3,359 20, $/kwh 0.18 $/kwh 1, ,343 44, ,296 53, ,755 *The accommodation lights are assumed to be running 18 hrs per day and engine room lights 24 hrs per day This means an average of US$ 47,000 per year savings or US$ 287,000 in five years. 2

4 For this vessel, a 815 kwh per day corresponds to 34 kw reduc1on in generator load which is 2% of the rated power. This means that when generator is normally running at 66% MCR it will, aber replacement, running at 64% MCR. The savings per year will also increase with the increase in F.O cost which is expected to be about 10% year on year (factored in five year savings calcula1on in above table). Cost The total installa1on cost for this vessel is about US$ 87,700. This includes cost of equipment, ini1al visit, monitoring, and installa1on. It can be separated as shown below. For subsequent vessels the monitoring can be avoided and the offer in those would be US$ 80,500. For five vessels this investment weighted aver- age to US$ 81,940. Lights Installation Monitoring Freight 8% 3% 36% 53% Spares The above cos1ng assumings 12% addi1onal spares which can cover for the five years with further order- ing. The current cos1ng of the spares are at a`rac1ve rates compared to US$ when ordered through ship chandlers. Moreover these lights have warranty for one year and are of much be`er quality. Savings The first year savings from reduc1on in F.O consump1on is US$ 47,000 and grows at 10% annually. Hence the installa1on cost of US$ 81,940 is recovered in less than 2 years. US$ YEAR 0 YEAR 1 YEAR 2 YEAR 3 YEAR 4 YEAR 5 INVESTMENT 81,940 ACCUMULATED 47,000 51,700 56,870 62,557 68,813 47,000 98, , , ,940 3

5 2. Case Study with Solar Power Executive Summary Solar energy can also be harnessed to reduce the fuel consump1on on board in way of reducing the load on the generator. A 5 kw solar power plant with grid- 1e inverter (without ba`eries) is installed in the vessel. For the cost of power of US$ 0.18 the return on investment is about six years. In typical vessels where gen- erators are running at lower load in sea, the returns are faster. Description For container vessels (even bulk carriers, tankers) the area available for installa1on of solar panels is only on monkey island. In this vessel a 5 kw solar power plant is installed. The system consists of SMA grid- 1e inverter, 6 kw mono- crystalline rigid panels, approved cables and protec1on devices. The DC power gener- ated from the solar panels is converted to AC and fed to the grid through the inverter that had grid interac- 1on to match the frequency and voltage. Energy Production The energy produced from solar panels is on average for 5 standard hours in a day which means 1 kw solar panels produce 5 kwh of electrical energy aber considering all losses. A 6 kw panel produces 30 kwh en- ergy per day. The savings per year will also increase at about 10% year on year factoring F.O price increase. SOLAR PANEL (KW) PRODUCTION PER DAY (KWH/KW) / DAY (KWH) / YEAR (KWH) / YEAR IN 6YEARS ,950 1,971 15, ,950 1,643 12,673 Cost The incremental cost of this installa1on is US$ 15,000. Savings The first year savings from reduc1on in F.O consump1on is US$ 1,971 and grows at 10% annually. Hence for US$ 15,000 as cost of installa1on the break- even 1me is around six years for cost of power of US$ 0.18 and about seven years if it is US$ US$ YEAR 0 YEAR 1 YEAR 2 YEAR 3 YEAR 4 YEAR 5 YEAR 6 YEAR 7 INVESTMENT 15,000 ACCUMULATED 1,971 2,168 2,385 2,623 2,886 3,174 3,492 1,971 4,139 6,524 9,147 12,033 15,207 18,699 4