WASTE HEAT FIRED SHIPBOARD CHILLING SYSTEM A WIN-WIN PROPOSITION

摘要

Natural refrigerant based waste heat activated refrigeration systems can serve as an important means of catering to various cooling needs. CO2 emission reduction and the potential to reduce Life Cycle Cost are some of their added benefits. Marine engine exhaust driven adsorption based shipboard chilling system (SCS) offers excellent opportunity for replacing conventional shipboard fish preservation means. Fishing trawlers in India traditionally use crushed ice for preservation. Trawlers carry 1 to 25 tons ice depending on fish-hold capacity which varies between 2 to 30 tons and while the typical voyage duration is between 3 to 12 days. Limitations of existing adsorption systems are larger size and high initial cost. This paper will present simulated system characteristics along with some experimental data for a 1 TR Activated Carbon/Ammonia (AC/NH3) based engine exhaust fired SCS, which was developed and tested in the Heat Pump Laboratory at IIT Bombay. Techno-economic viability of the novel rugged and reliable SCS will also be presented. Water was chilled from 10°C to below 3°C while operating the SCS using hot air at 400 to 450°C. Overall weight and size is 360 kg and 0.75 m3 respectively. COP and specific cooling power ranged between 0.25 to 0.3 and 65 to 95 W/kg AC respectively. Use of SCS would save about 1.63 l/h diesel due to reduced ice payload and eliminated ice cost up to 1.66 Lakh/yr (US$ 3757/yr). Reduction in CO2 emission, due to reduced ice payload and saved electricity in the ice factory, works out to be 30 ton CO2/yr and 13.4 ton CO2/yr respectively.