Advances in heat pump systems: A review

https://northumbria-test.eprints-hosting.org/id/document/271009

Energy-water-environment nexus underpinning future desalination sustainability

Seawater desalination is an important process to meet the increasing demand for fresh water demand; however, it is highly energy intensive due to the high salinity of the source. Studies on using solar energy to drive seawater desalination are very actively being pursued. This paper reviews the current solar desalination research activities first, followed by discussions of solar assisted desalination processes and a variety of possible combinations. Solar assisted desalination has been proved technically feasible; however the combined solar and fossil fuel desalination, and desalination using low grade waste heat could be more cost effective at this time. Though solar assisted desalination processes have not been commercialized as yet, with the current ongoing research, they remain a valid option for future desalination plants.

http://jiljilx.persiangig.com/18e8a4bd3b5080a434cd27fe82b86f5a.pdf

Solar assisted sea water desalination: A review

This paper provides a literature review on ejectors and their applications in refrigeration. A number of studies are grouped and discussed in several topics, i.e. background and theory of ejector and jet refrigeration cycle, performance characteristics, working fluid and improvement of jet refrigerator. Moreover, other applications of an ejector in other types of refrigeration system are also described.

Ejectors: applications in refrigeration technology

In ejector refrigeration systems, the performance of the ejector is critical to the performance, capability, size and cost of the whole system. Construction of mathematical models has been used as an effective method for analyzing the performance of the ejector as well as the whole refrigeration system. These models can also be used to guide system operation, interpret experimental results and assist in system design and optimization. The overall objective of this paper is to provide a review of various researches of the mathematical model on the hydrodynamic and thermodynamic character within the ejector. The paper first briefly describes ejector including fundamental principle, flowing and mixing mechanism and the method of model establishment. Then various models consisting of ideal assumptions, governing equations, auxiliary conditions, solution methods and main results are presented. The models can be classified into two main categories: (i) steady thermodynamic models which can be further subdivided into single-phase flow model and two-phase flow model and (ii) dynamic models which are also subdivided according to the flowing phases considered. It has been shown that the dynamic models have higher prediction precision and give more information compared with the steady thermodynamic models. In addition, the simplified empirical and semi-empirical models based on measured data are briefly discussed. This review is useful for understanding the evolution process and the current status of the mathematical models on ejector and highlighting the key aspects of model improvement such as the mixing mechanism, the capture of the shock wave, etc.

Narmine H. Aly

Papers

Mechanical vapor compression desalination systems — A case study

Modelling and simulation of steam jet ejectors

Thermal performance of seawater desalination systems

Dynamic response of multi-effect evaporators