a b s t r a c tOver the last 25 years solar power plants based on parabolic trough concentrators have been developed for the commercial power industry. On the other hand, in recent years, a way to harness the solar energy is to cogenerate through Concentrated Solar Power (CSP) technology coupled to an Organic Rankine Cycle (ORC) with potential applications to industrial processes. In this work we present a study of a small CSP plant coupled to an ORC with a novel configuration since useful energy is directly used to feed the power block and to charge the thermal storage. In order to analyze this novel configuration we consider a case study with cogeneration applied to textile industrial process at medium temperature. It turns out that this configuration reduces the size of the thermal storage disposal. The performance of the solar power plant was simulated with TRNSYS to emulate real operating conditions. We show the design, study and simulation results, including the production and efficiency curves for our load profile. Our results show that our system is a promising option for applications to medium temperature processes where electrical and heat generation is required.
The effect of refrigerant blends 410A and 507 on the operation of an ejector cooling system -ECS-is theoretically studied with the aid of a validated multi-geometry ejector mathematical model. For a system cooling capacity of 1 kW, a set of possible design conditions were obtained by means of a parametric study varying the generator, condenser and evaporator temperatures from 50ºC to 70ºC; 30ºC to 40ºC and 5ºC to 15ºC. The ejector's lower U and values are obtained when R410A is employed, meaning higher primary fluid mass flow rates and smaller ejectors, respectively. ECS's upper COP s values are achieved at higher T GE and T EV with lower T CO . An ECS operating with these blends has a higher COP s using R410A, around 0.53 for T GE , T CO and T EV of 70ºC, 30ºC and 10ºC, respectively. The system using R507 has a similar but slightly lower performance. Therefore, the systems employing R410A and R507 are good options when a maximum generation temperature of 70ºC is available from a thermal source, either solar or industrial. As well, an ECS working with R410A and R507 experiences higher pressures and has a robust construction.
NomenclatureCOP coefficient of performance (dimensionless) d diameter (m) ECS ejector cooling system F f friction factor (dimensionless) h specific enthalpy (kJ/kg) l distance, length (m) m mass flow rate (kg/s) p pressure (MPa) Q heat flow rate (kW) T temperature (ºC) U entrainment ratio, 2 m / 1 m , (dimensionless) W mechanical power (kW) ejector area ratio, (d m /d t ) 2 , (dimensionless) efficiency (dimensionless) Subscripts CO condenser d diffuser e main nozzle exit EV evaporator GE generator m mixing chamber n main nozzle, between main nozzle exit and mixing chamber inlet p r reversible pump s system t main nozzle throat 1…6 thermodynamic cycle states Jorge I. Hernandez et al. / Energy Procedia 57 ( 2014 ) 3021 -3030 3023
The spray assisted chemical vapor deposition (AACVD) technique is used to make thin film growth through the spraying of a precursor solution in the form of droplets, by means of a nozzle moving horizontally along the substrate. One of the most influential variables in the growth of the films is the speed with which the nozzle moves, since the deposition uniformity depends on this, which is directly related to the different physical properties of the coating. This paper briefly shows the electronic control built for the manipulation of this variable and a statistical study is presented that allowed to determine that the experimental speed presents oscillations less than 10% with respect to the programmed value. In addition, comparative transmittance spectra are shown where the reproducibility and repeatability of the coatings manufactured with the AACVD equipment built in the UTP is observed.
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