Performance optimization for a variable throat ejector in a solar refrigeration system

Yen, Ruey‐Hor; Huang, Bin‐Juine; Chen, C.Y.; Shiu, Tz-Fan; Cheng, Chiao-Hung; Chen, S.S.; Shestopalov, Kostyantyn

doi:10.1016/j.ijrefrig.2013.04.005

Cited by 48 publications

(13 citation statements)

References 20 publications

(21 reference statements)

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“…COP is higher in the first period as higher evaporator temperature and COP is decrease as lower evaporator temperature at longer time. This result is given the same as Pollerberg, et al [7] and Yen, et al [8] Furthermore, the results show condenser temperature significantly affects COP as well. That is, as condenser temperature decreases, COP increases which this result is similar to Petrenko, et al [9] and Pollerberg, et al [7].…”

Section: Resultssupporting

confidence: 81%

Performance of R141b Ejector with Thermal Storage for Solar Air Conditioning

Sripanom¹,

Vaivudh²

2015

JEPE

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This paper was designed to determine the performance of the R141b ejector includes analysis in economics. The first step is to determine the operating condition and ejector geometry through computer calculation program. That found at the generator temperature 84 °C and evaporator temperature 8 °C, diameter of nozzle throat is 2 mm, diameter of nozzle exit is 8 mm, diameter of mixing chamber inlet is 25 mm, diameter of constant area section is 8 mm. Area of evacuated solar collector is 10 m 2 , thermal storage tank size is 0.33 m 3 , cold thermal storage size is 2.3 m 3 . The entrainment ratio and COP (coefficient of performance) of computer calculation program are 0.295 and 0.235, respectively. The second step ejector is fabricated and equipped to solar ejector refrigeration system, it is found that, average COP is 0.265. The economics analysis of solar ejector cooling system are invested in the investment cost was 158,158 baht. When calculating payback period was 7.73 years, the return value on a NPV (net present value) was 60,872.63 baht of lifetime of the system throughout a period of 15 years, and IRR (internal rate of return) is 13.57%.

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Section: Resultssupporting

confidence: 81%

Performance of R141b Ejector with Thermal Storage for Solar Air Conditioning

Sripanom¹,

Vaivudh²

2015

JEPE

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“…The trend of the area ratio as a function of T g is shown in Fig. 11 resulting coherent with the literature (Chen et al, 2014c;Yen et al, 2013). Indeed, the area ratio grows with T g as a result of the increase of the entrainment effect.…”

Section: Influence Of Generator Temperaturesupporting

confidence: 88%

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

Besagni

Mereu

Leo

et al. 2015

International Journal of Refrigeration

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COP Entrainment ratio Ejector refrigeration Ejector efficiencies a b s t r a c tThis paper studies the influence of working fluids over the performance of heat driven ejector refrigeration systems performance by using a lumped parameter model. The model used has been selected after a comparison of different models with a set of experimental data available in the literature. The effect of generator, evaporator and condenser temperature over the entrainment ratio and the COP has been investigated for different working fluids in the typical operating conditions of low grade energy sources. The results show a growth in performance (the entrainment ratio and the COP) with a rise in the generator and evaporator temperature and a decrease in the condenser temperature. The working fluids have a great impact on the ejector performance and each refrigerant has its own range of operating conditions. R134a is found to be suitable for low generator temperature (70e100 C), whereas the hydrocarbons R600 is suitable for medium generator temperatures (100e130 C) and R601 for high generator temperatures (130e180 C). i n t e r n a t i o n a l j o u r n a l o f r e f r i g e r a t i o n 5 8 ( 2 0 1 5 ) 1 5 4 e1 7

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“…an ejector with a movable nozzle or a movable spindle, can widen the range of operating conditions. The variable throat ejector was also analyzed by Yen et al [103] using CFD simulations using R145fa for T c among 35-40°C and T g among (90-110°C). Dennis et al [177] studied a SoERC using R245fa and proposed an algorithm to design a variable geometry nozzle diameter.…”

Section: Discussionmentioning

confidence: 99%

“…Another method for dealing with the transient phenomena is a variable throat ejector. A variable throat ejector was studied by Yen et al [103] using CFD simulations using R145fa, T c values between 35-40°C and T g between 90 and 110°C. Pereira et al [200] experimentally studied R600a ejector with variable geometry: if compared to a fixed ejector, COP would increase by 80%.…”

Section: Standard Soersmentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

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a b s t r a c tThe increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

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Performance optimization for a variable throat ejector in a solar refrigeration system

Cited by 48 publications

References 20 publications

Performance of R141b Ejector with Thermal Storage for Solar Air Conditioning

Performance of R141b Ejector with Thermal Storage for Solar Air Conditioning

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

Ejector refrigeration: A comprehensive review

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