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S.S. Chauhan

Bio: S.S. Chauhan is an academic researcher. The author has contributed to research in topics: Pressure drop & Coefficient of performance. The author has an hindex of 3, co-authored 4 publications receiving 21 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the effect of the configuration and the capillary tube diameter on the overall performance of a simple vapour compression refrigeration system was studied, and the experimental results revealed that the mass flow rate is maximum for the straight configuration and is least for the helical coiled configuration.
Abstract: The study of the expansion device in the simple vapour compression refrigeration system is necessary in order to understand the parameters which can enhance the overall performance of the system. The experimental study was done on the capillary tubes of 31 gauge, 36 gauge and 40 gauge and each test section was studied with three distinct configurations i.e. helical coiled, straight coiled and serpentine coiled configuration. The effect of the configuration and the capillary tube diameter on the overall performance of the system was studied. The findings of the experimental study revealed that the mass flow rate is maximum for the straight configuration and is least for the helical coiled configuration. The refrigeration effect was found to be maximum for the helical coiled configuration and was found to be least for straight coiled configuration. The compressor work was found to reduce as the load was increased on the system. Decreasing the capillary tube diameter increased the mass flow rate in the system and decreased the refrigeration effect produced.

9 citations

Journal ArticleDOI
TL;DR: In this article, the effect of capillary tube geometry on the performance of refrigeration systems was studied using both physical models and mathematical modeling concepts, and the parameters stated above can be further optimized in order to enhance the performance.
Abstract: It is essential to study the effect of capillary tube geometry on the performance of refrigeration systems. The literature review focuses on the effect that geometrical parameters like capillary tube length, bore diameter, coil pitch, number of twist and twisted angle have on the pressure drop, coefficient of performance (COP) and mass flow rate of the system. These parameters can be further studied using physical models and mathematical modeling concepts. The parameters stated above can be further optimized in order to enhance the performance of the refrigeration system.

5 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a review of the literature on the pressure drop characteristics of two-phase flow in helically coiled tubes is presented, with a practical summary of the relevant correlations and supporting theory for the calculation of the two phase pressure drop.

43 citations

Journal ArticleDOI
TL;DR: Retaining the event tree framework, a new methodology is proposed to calculate incremental risks and the article shows how both methodologies are equivalent and also applies them to a case study.
Abstract: In the past few years, the field of dam safety has approached risk informed methodologies throughout the world and several methodologies and programs are appearing to aid in the systematization of the calculations. The most common way of implementing these calculations is through the use of event trees, computing event probabilities, and incremental consequences. This methodology is flexible enough for several situations, but its generalization to the case of systems of several dams is complex and its implementation in a completely general calculation methodology presents some problems. Retaining the event tree framework, a new methodology is proposed to calculate incremental risks. The main advantage of this proposed methodology is the ease with which it can be applied to systems of several dams: with a single risk model that describes the complete system and with a single calculation the incremental risks of the system can be obtained, being able to allocate the risk of each dam and of each failure mode. The article shows how both methodologies are equivalent and also applies them to a case study.

30 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a non-structural approach for assessing nonstructural approaches in the context of existing risk analysis methods, and then demonstrated the application of the proposed methods in support of planning for near-field tsunami hazards along the Pacific coast of North America.
Abstract: Communities worldwide face dangers due to floods induced by natural events or technical failures. These vulnerabilities are increasing due to continued settlement along coastlines and in floodplains, and may be exacerbated in future by climate change. Flood losses can be mitigated via structural and nonstructural (or community based) means. Risk analysis can be undertaken on behalf of different stakeholders including: policy makers or regulatory bodies; asset owners; the local community; and individuals who live, work or recreate in the hazard impact zones. While methods exist for assessing the risks associated with water impoundment and control structures, less effort has been devoted to developing methods that can assess the merits of community-based preparation and response activities such as evacuation and sheltering in place. There is a need to identify the best approaches for undertaking assessments of proposed plans, and to explore opportunities for adapting existing models to provide these capabilities. This paper posits the challenge of assessing nonstructural approaches in the context of existing risk analysis methods, proposes a possible direction for developing new methods of analysis, and then demonstrates the application of the proposed methods in support of planning for near-field tsunami hazards along the Pacific coast of North America.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of the configuration and the capillary tube diameter on the overall performance of a simple vapour compression refrigeration system was studied, and the experimental results revealed that the mass flow rate is maximum for the straight configuration and is least for the helical coiled configuration.
Abstract: The study of the expansion device in the simple vapour compression refrigeration system is necessary in order to understand the parameters which can enhance the overall performance of the system. The experimental study was done on the capillary tubes of 31 gauge, 36 gauge and 40 gauge and each test section was studied with three distinct configurations i.e. helical coiled, straight coiled and serpentine coiled configuration. The effect of the configuration and the capillary tube diameter on the overall performance of the system was studied. The findings of the experimental study revealed that the mass flow rate is maximum for the straight configuration and is least for the helical coiled configuration. The refrigeration effect was found to be maximum for the helical coiled configuration and was found to be least for straight coiled configuration. The compressor work was found to reduce as the load was increased on the system. Decreasing the capillary tube diameter increased the mass flow rate in the system and decreased the refrigeration effect produced.

9 citations

Proceedings ArticleDOI
21 Jun 2011
TL;DR: In this paper, a baseline risk assessment of Success Dam, California has been performed and the need of remediation for improving the performance of the dam under earthquake loading has been identified.
Abstract: Seismic deficiency of Success Dam, California has been determined and the need of remediation for improving the performance of the dam under earthquake loading has been identified. Consequently, the dam is currently operated under reservoir pool elevation restriction, pending rehabilitation implementation. Justification of operation restrictions and establishing the priority of remediation activities required preparation of a baseline risk assessment. This paper describes the overall risk model and the results of the risk assessment supporting the justification of operation restrictions. Two companion papers describe the potential failure modes related to earthquake events and flood events. PROJECT DESCRIPTION Lake Success has been operated by the Sacramento District of the US Army Corps of Engineers (USACE) since completion of construction in 1961. The project comprises the dam, the Frazier Dike and a reservoir located on the Tule River about 10 km (6 miles) east of Porterville and 72 km (45 miles) north of Bakersfield, California. The reservoir captures runoff from a 1,013 km (391 square miles) mountainous watershed. It is part of a system of reservoirs that provide flood protection to the Tulare Lakebed and adjacent areas. It also provides irrigation water storage and recreation benefits. Success Dam is a compacted earthfill embankment dam 44.2 m (145 feet) high, 1,038 m (3,404 feet) long and with a crest elevation of 210.8 m (691.5 feet) as shown in a companion paper by Anderson et al. (2011). The dam has a central core of sandy clay and clay, and a pervious shell. The shell material is protected by a 3.7 m (12 feet) thick transition zone, which partially meets modern filter criteria between the core and the transition material and between the transition material and the pervious shell. There is a cutoff trench under the core that extends through the recent alluvium to either bedrock or in some cases to an older alluvium stratum. The recent alluvium was not excavated in the area beneath the pervious shell. Shear wave velocity measurements and standard penetration tests in the recent alluvium and the upstream and downstream embankment shoulders indicate that these materials are loose and could be subject to liquefaction during an earthquake. 586 GeoRisk 2011 © ASCE 2011

7 citations