High COP absorption chiller driven by engine cooling water
In cogeneration systems, absorption chillers play an important role for utilizing the heat exhausted from engine, especially during summer. A conventional one has low COP of only about 0.65, and its COP falls abruptly according to going down of the engine cooling water temperature. The temperature falls down with decreasing of engine load, and engine runs generally at the light load lower than 80{approximately}90%, therefore COP becomes low more and more. The new type has higher COP of 0.75, and can keep the COP in the wide range of the engine cooling water temperature from 90{degrees}C to 70{degrees}C. To add to the merit, the new one is 3O%{approximately}40% smaller than the old one. These improvements was achieved by the followings: (1) Minimizing the LiBr solution flow rate to get the higher COP. The flow rate becomes the smaller, the weak solution temperature entering the generator will be the higher, by heat exchanging with the high temperature strong solution leaving the generator. The inlet solution temperature to the generator becomes the higher, the heat input to the generator for concentrating the solution will be the smaller, and the COP will be the higher. (2) Adopting the tubes which outside surface can be perfectly wetted by only the minimized solution flow rate to keep the high heat transfer rate. Changing the generator tube arrangement from conventional horizontally long type to new vertically long type to get high dense distribution. (3) Taking the spray type generator instead of the conventional flowed type to hold the high COP in the wide range of engine cooling water temperature. The heat transfer rate of the flowed type descends with the heat load, but the one of the spray type doesn`t. Supposing the light load of engine, the heat input to the generator and the heat transfer rate of the flooded one falls down, therefore the solution temperature also goes down.
- OSTI ID:
- 54735
- Report Number(s):
- CONF-941218-; TRN: 95:003625-0043
- Resource Relation:
- Conference: 17. world energy engineering congress and the 4th environmental technology congress and expo, Atlanta, GA (United States), 7-9 Dec 1994; Other Information: PBD: 1995; Related Information: Is Part Of Competitive energy management and environmental technologies: Proceedings; PB: 640 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Report on Toyota Prius Motor Thermal Management
Evaporatively cooled chiller for solar air conditioning systems design and field test. Final report