This project aims to achieve the economic use of heat at temperatures of 70°C to 90°C to produce cold usable at temperatures from -5°C to -30°C by means of a new type of absorption refrigeration plant. The additional low-pressure absorber will be cooled by part of the refrigerant down to a temperature below the temperature of cooling water. Thus, it will be possible to increase the concentration of the strong solution as well as the concentration width in order to operate the desorber at lower temperatures.
The process simulation and modelling using TRANSYS, CHEMCAD are carried out by IKE, Stuttgart and CNAM, Paris. Special ammonia-water models are to be developed and adapted to the new cycle and its components. On the basis of waste heat and temperatures data, the mass and energy balance of the plant will be provided.
These data will be the basis for the planning and construction of the components and the pilot plant with a refrigeration capacity of 150 - 300 kW to be carried out by IEV, Schottke, Atein and Calfluid. Larger components such as apparatus and heat exchangers are self-manufactured. The plant will be connected to a technical plant by means of a by-pass system at the facilities of Schottke. Thus it will work under normal operating conditions. The trial run will be started after carrying out single tests. To operate the plant over a wide range of performance, the following input parameters have to be varied: heating temperature, heat input, temperature of cooling water, pressure of low pressure absorber. The produced cold will be transferred via the evaporation of the ammonia to the cold system of Schottke. The trial data are to be compared with the simulation programs. If there are any deviations, the models have to be corrected up to a quantitative correspondence which enables to predict trial data.
Expected Achievements and Exploitation
The results of this project will be :
- Experimental and theoretical data, which form the basis of design and operation for future large-scale commercial plants
- Numerical methods to calculate each component and the whole process
- LPC-programs for automatic operation
- Data for calculation of efficiency depending on heat input and cold conditions
- Data for economic consideration depending on conditions of applications (use of district heating, waste heat utilization in dairies and breweries, cooling of warehouses using heat co-generation etc.)
Funding SchemeCSC - Cost-sharing contracts