One of the thermodynamic losses in the vapor-compression retr1geration cycle is the throttllng process in the expansion valve. It work is extracted from the refr1gerant during the expansion process, the efficiency of the cycle is swnificantly 1mproved. It 1s proposed that the high-pressure retngerant be used as the motive fluid of a Jet ejector. Instead of extract1ng mechanical work from the ex...

In the present study, an unlooped pulating heat pipe has been considered with two liquid slugs and three neighboirng vapor plugs.The governing equations such as momentum, energy and mass equations are solved explicitly except the energy equation of liquid slugs.The aim of the present study is to calculate the entropy generation through the performance of a pulsating heat pipe. Additionally, the...

A heat pump system is constructed tO evaluate the performance and the heat transfer characteristics. Mixtures of R22/Rl42b are adopted in the heat pump. The heat transfer in the evaporator and the overall perfomance arc measured and analyzed in terms of the compositions and the flow rate of the refrigerants. The evaporator consists of counter~currem concentric circular tubes. Possibility of cap...

Solar adsorption refrigeration is promising technology especially in the developing countries and remote areas because the system can be driven by solar energy without involving electricity. Therefore, it is technologically possible and socially feasible in the areas where electricity is not enough but solar energy is rather easy to obtain. The conventional system works intermittently and produ...

Solution chemistry of wastes from US atomic weapons production is controlled to inhibit corrosion of carbon steel tanks used in containment and storage. The pH, nitrate ion and nitrite ion concentrations of fresh solutions are maintained within specified limits for this purpose. In the start up process for a new waste evaporator (RHLWE), non-radioactive solutions of similar chemistry will be ci...

The performance of a falling-film evaporator trial plant during the first year after installation at the CG Smith Sugar Illovo mill is described. Operating under conditions similar to those experienced in the mill's raw house first effectevaporator, the unit confirmed most of the reported characteristics of this type of plant and proved easy to operate. Problems experienced were associated most...

Abstract The performance of a dual evaporator cycle using ejector is compared with conventional employing pressure reducing valve. In both the systems, high temperature considered as flooded evaporator, thus separator employed after evaporator. However, low kind dry comparison i.e., and assisted, done for same cooling capacities dryness fraction at exit R134a, R152a, R1234yf refrigerants. effec...

An experimental and analytical study on the performance of carbon dioxide heat pumps for water heating was conducted. The performance of compact, microchannel, water-coupled gas coolers, evaporator, and suction line heat exchanger (SLHX) were evaluated in an experimental facility. Analytical heat exchanger models accounting for the flow orientation and changing CO2 thermophysical properties wer...