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Ammonia-absorption refrigeration units (AARUS) can supply subfreezing refrigeration for many industrial applications. Such units are usually driven by waste heat or renewable energy at relatively low temperatures. The performance of the chiller is highly dependent on the temperatures of the driving heat, the chilling load, and the cooling water. In this paper, the performance of an advanced industrial-scale ammonia-absorption unit is modeled over a representative operating range. The performance is then characterized by a set of simple equations incorporating the three external temperatures. This simple model helps to evaluate potential applications, predict performance, and perform initial optimization. Case studies are presented highlighting the application of the model.

Thermoelectric source has proven its efficaciousness as a clean and affordable alternative energy source. Thermoelectric generators are the ones which can produce electricity from heat. The concept of thermoelectricity, its production and its related concepts are reviewed in this paper. Peltier tile, a device used as a TEG, is used in various ways to produce electricity which are thoroughly reviewed in this paper. Thermoelectricity produces from these tiles proves to be a very good source of alternate energy. Despite technological revolutions, there are many places devoid of electricity due to various reasons. Thermoelectricity generation would prove to be a very clean and affordable alternative energy source in these areas. This paper reviews TEG how it generates a clean, affordable and easily accessible energy: electricity, without the need of transmission lines.

The absorption refrigeration device and the adsorbent refrigeration device are the usual cooling methods driven by the use of diesel-generator waste heat. In this paper, the discussion of the two methods is developed on the selection of system types, the utilization efficiency, the match methods of the cooling capacity, as well as the issues to be solved. Through calculation and comparison: it's found that absorption refrigeration device produces more cooling capacity from waste heat recovery, for which the waste heat of flue gas could be used directly, and double-effect unit could be adopted; for adsorbent refrigeration device, the cooling capacity is able to be improved by recovering the waste heat of cooling hot-water together with the waste heat of hot water which is converted from the waste heat of flue gas.