The Experts below are selected from a list of 219102 Experts worldwide ranked by ideXlab platform

Surendra Singh Kachhwaha - One of the best experts on this subject based on the ideXlab platform.

  • thermo economic analysis of solar biomass organic rankine cycle powered cascaded vapor compression Absorption System
    Solar Energy, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha
    Abstract:

    Abstract In this paper, a novel solar-biomass organic Rankine cycle (ORC) powered cascaded vapor compression-Absorption System is proposed for low temperature cooling applications. The proposed System achieves clean and efficient low temperature cooling and heating with zero dependency on fossil fuels. Thermo-economic analysis is reported to assess the performance and commercial viability of the System. The solar fraction and break-even point (BEP), considering paraboloid dish, n-pentane organic fluid, straw type biomass, and Jodhpur location, are calculated as 0.254 and 7.71 years, respectively. Due to lower annual efficiency, the solar fraction for the linear Fresnel reflector (LFR) based System is 0.179; however, the lower cost of LFR field and lower cost of energy generation from biomass leads to the lower BEP (7.43 years). Thermo-economic performance of the System is also affected by the ORC working fluid and the calculated break-even values are 7.85 years for Toluene and 8.16 years for R245fa. In comparison with the solar-biomass powered System, the fully biomass powered System achieves 39% lower capital cost and 30% lower BEP. The selection of the biomass is influenced by the calorific value and cost. The decision of selection between the proposed System and the equivalent stand-alone cooling and heating is influenced by the characteristics of solar field and biomass, ORC working fluid, electricity and process heat cost, location of installation, discount rate, cost of process heat and electricity.

  • thermo economic analysis of a novel organic rankine cycle integrated cascaded vapor compression Absorption System
    Journal of Cleaner Production, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha, Vaibhav Jain, Nanji J Hadia
    Abstract:

    Abstract Integration of thermal Systems improves the energy efficiency and reduces the carbon emissions. In this paper, a novel trigeneration System, which integrates the organic Rankine cycle and vapor compression–Absorption cascade refrigeration cycle is proposed. The cascade refrigeration System combines the advantages of the conventional stand-alone vapor compression System and vapor Absorption refrigeration System. The energetic and rational efficiencies of the proposed System, with n-pentane as an ORC working fluid, are calculated as 79.02% and 46.7%, respectively. Effects of variation in different operating parameters as well as organic working fluid on energetic and exergetic efficiencies have been studied. The coefficient of structural bond analysis demonstrates that the evaporator and cascade condenser operating temperature significantly affects the System performance. The proposed trigeneration System powered by waste heat is independent of the grid supply; however, a stand-alone vapor compression refrigeration System requires about 19.15 kWe to meet the equivalent cooling demand. The decision of selection between the stand-alone System and the proposed trigeneration System is influenced by the compressor capacity of stand-alone vapor compression refrigeration System, cost of unit electricity, compressor runtime, cost of organic Rankine cycle power block, and cost of vapor Absorption System. Based on the condition of equality of the annualized cost of the stand-alone System and proposed trigeneration System, a methodology for selection between these two configurations, called selection diagram, is also presented in this paper. The selection diagram gives quick suggestion about the optimal configuration at the initial design stage. The economic analysis reveals that the simple payback period and breakeven point for the proposed hybrid System are 6.2 years and 4.9 years, respectively.

  • Thermodynamic modelling and parametric study of a low temperature vapour compression-Absorption System based on modified Gouy-Stodola equation
    Energy, 2015
    Co-Authors: Vaibhav Jain, Gulshan Sachdeva, Surendra Singh Kachhwaha
    Abstract:

    Present paper thermodynamically analyses a VCAS (vapour compression-Absorption System) with carbon dioxide (compression section) and ammonia-water (Absorption section) as refrigerants and determines the optimal condensing temperature of cascade condenser using modified Gouy-Stodola equation. The optimum cascade condenser temperature is found to be −13 °C for 175 kW refrigeration capacity at an evaporator temperature of −45 °C and condenser temperature of 35 °C. The optimum cascade condenser temperature maximises the overall COP, rational efficiency and minimises the total irreversibility rate of the VCAS System. The value of optimum condensing temperature and its corresponding maximum COP, and minimum irreversibility rate are discussed for a wide range of operating conditions. Further, a comparative study of TSVCS (two stage vapour compression System) used for low temperature refrigeration applications with VCAS shows that at design point, primary energy consumption is reduced by 60.6% and electrical COP is improved by 153.6% in VCAS as compared to conventional TSVCS. But the total irreversibility rate of VCAS is 38.4% higher than the TSVCS due to the use of low grade energy in vapour Absorption System and hence the rational efficiency of VCAS is 14% low.

Bhavesh Patel - One of the best experts on this subject based on the ideXlab platform.

  • thermo economic analysis of solar biomass organic rankine cycle powered cascaded vapor compression Absorption System
    Solar Energy, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha
    Abstract:

    Abstract In this paper, a novel solar-biomass organic Rankine cycle (ORC) powered cascaded vapor compression-Absorption System is proposed for low temperature cooling applications. The proposed System achieves clean and efficient low temperature cooling and heating with zero dependency on fossil fuels. Thermo-economic analysis is reported to assess the performance and commercial viability of the System. The solar fraction and break-even point (BEP), considering paraboloid dish, n-pentane organic fluid, straw type biomass, and Jodhpur location, are calculated as 0.254 and 7.71 years, respectively. Due to lower annual efficiency, the solar fraction for the linear Fresnel reflector (LFR) based System is 0.179; however, the lower cost of LFR field and lower cost of energy generation from biomass leads to the lower BEP (7.43 years). Thermo-economic performance of the System is also affected by the ORC working fluid and the calculated break-even values are 7.85 years for Toluene and 8.16 years for R245fa. In comparison with the solar-biomass powered System, the fully biomass powered System achieves 39% lower capital cost and 30% lower BEP. The selection of the biomass is influenced by the calorific value and cost. The decision of selection between the proposed System and the equivalent stand-alone cooling and heating is influenced by the characteristics of solar field and biomass, ORC working fluid, electricity and process heat cost, location of installation, discount rate, cost of process heat and electricity.

  • thermo economic analysis of a novel organic rankine cycle integrated cascaded vapor compression Absorption System
    Journal of Cleaner Production, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha, Vaibhav Jain, Nanji J Hadia
    Abstract:

    Abstract Integration of thermal Systems improves the energy efficiency and reduces the carbon emissions. In this paper, a novel trigeneration System, which integrates the organic Rankine cycle and vapor compression–Absorption cascade refrigeration cycle is proposed. The cascade refrigeration System combines the advantages of the conventional stand-alone vapor compression System and vapor Absorption refrigeration System. The energetic and rational efficiencies of the proposed System, with n-pentane as an ORC working fluid, are calculated as 79.02% and 46.7%, respectively. Effects of variation in different operating parameters as well as organic working fluid on energetic and exergetic efficiencies have been studied. The coefficient of structural bond analysis demonstrates that the evaporator and cascade condenser operating temperature significantly affects the System performance. The proposed trigeneration System powered by waste heat is independent of the grid supply; however, a stand-alone vapor compression refrigeration System requires about 19.15 kWe to meet the equivalent cooling demand. The decision of selection between the stand-alone System and the proposed trigeneration System is influenced by the compressor capacity of stand-alone vapor compression refrigeration System, cost of unit electricity, compressor runtime, cost of organic Rankine cycle power block, and cost of vapor Absorption System. Based on the condition of equality of the annualized cost of the stand-alone System and proposed trigeneration System, a methodology for selection between these two configurations, called selection diagram, is also presented in this paper. The selection diagram gives quick suggestion about the optimal configuration at the initial design stage. The economic analysis reveals that the simple payback period and breakeven point for the proposed hybrid System are 6.2 years and 4.9 years, respectively.

Lars Westerlund - One of the best experts on this subject based on the ideXlab platform.

  • flue gas purification and heat recovery a biomass fired boiler supplied with an open Absorption System
    Applied Energy, 2012
    Co-Authors: Lars Westerlund, Roger Hermansson, Jonathan Fagerstrom
    Abstract:

    A new technique for energy recovery combined with particle separation from flue gas has been tested in this project. A conventional small boiler for biofuel produces besides heat also particles to the environment through the flue gas. Decreasing the impact on the environment is desirable. Increased efficiency can be obtained if the temperature and water content of the flue gas can be further reduced. Installing an open Absorption System in the heat production unit fulfils both these demands. An experimental unit has been built and tested in the last 2years. The results show a reduction of particles in the flue gas by 33–44% compared to the ordinary System. At the same time the heat production from the unit increased by 40% when fired with wet biofuels.

  • flue gas purification and heat recovery a biomass fired boiler supplied with an open Absorption System
    Applied Energy, 2012
    Co-Authors: Lars Westerlund, Roger Hermansson, Jonathan Fagerstrom
    Abstract:

    A new technique for energy recovery combined with particle separation from flue gas has been tested in this project. A conventional small boiler for biofuel produces besides heat also particles to ...

  • energy efficient bio fuel drying with an open Absorption System parameter study in order to reduce investment costs
    Applied Energy, 2000
    Co-Authors: Lars Johansson, Lars Westerlund
    Abstract:

    Abstract A pilot plant using the open Absorption System for drying of timber and bio fuel has been realized at a sawmill located in the northern part of Sweden. The technique decreases the energy demand for the dryers considerably and the System has an availability of about 8000 h per year. Compared with other drying techniques, the investment cost is high due to large airflow and therefore large apparatus. The main part of the investment cost, i.e. about 70% originates from the bio fuel dryer and the absorbers. In order to decrease the initial cost a parameter study has been made to investigate the possibilities to reduce the airflow of the drying process, i.e. bio fuel dryer and absorber. Parameters studied are drying temperature, salt concentration and cooling of the airflow during the Absorption process. Measured values from the pilot plant have been used as a reference case. The results show that it is possible to decrease the airflow by 31% when using a higher drying temperature. Higher salt concentration decreases the airflow by approximately 32% and cooling during Absorption makes it possible to decrease the airflow by 50%. In order to minimize the airflow, the three parameters were combined. In this case it is possible to decrease the airflow by approximately 60%. The electrical input for the plant is also high due to large air and solution flows. By decreasing the airflow, the required electrical input will also decrease since the fan power is proportional to the volume airflow. The results clearly show that it is possible to reduce the airflow and therefore the investment costs compared with the pilot plant.

Jonathan Fagerstrom - One of the best experts on this subject based on the ideXlab platform.

Nishith B Desai - One of the best experts on this subject based on the ideXlab platform.

  • thermo economic analysis of solar biomass organic rankine cycle powered cascaded vapor compression Absorption System
    Solar Energy, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha
    Abstract:

    Abstract In this paper, a novel solar-biomass organic Rankine cycle (ORC) powered cascaded vapor compression-Absorption System is proposed for low temperature cooling applications. The proposed System achieves clean and efficient low temperature cooling and heating with zero dependency on fossil fuels. Thermo-economic analysis is reported to assess the performance and commercial viability of the System. The solar fraction and break-even point (BEP), considering paraboloid dish, n-pentane organic fluid, straw type biomass, and Jodhpur location, are calculated as 0.254 and 7.71 years, respectively. Due to lower annual efficiency, the solar fraction for the linear Fresnel reflector (LFR) based System is 0.179; however, the lower cost of LFR field and lower cost of energy generation from biomass leads to the lower BEP (7.43 years). Thermo-economic performance of the System is also affected by the ORC working fluid and the calculated break-even values are 7.85 years for Toluene and 8.16 years for R245fa. In comparison with the solar-biomass powered System, the fully biomass powered System achieves 39% lower capital cost and 30% lower BEP. The selection of the biomass is influenced by the calorific value and cost. The decision of selection between the proposed System and the equivalent stand-alone cooling and heating is influenced by the characteristics of solar field and biomass, ORC working fluid, electricity and process heat cost, location of installation, discount rate, cost of process heat and electricity.

  • thermo economic analysis of a novel organic rankine cycle integrated cascaded vapor compression Absorption System
    Journal of Cleaner Production, 2017
    Co-Authors: Bhavesh Patel, Nishith B Desai, Surendra Singh Kachhwaha, Vaibhav Jain, Nanji J Hadia
    Abstract:

    Abstract Integration of thermal Systems improves the energy efficiency and reduces the carbon emissions. In this paper, a novel trigeneration System, which integrates the organic Rankine cycle and vapor compression–Absorption cascade refrigeration cycle is proposed. The cascade refrigeration System combines the advantages of the conventional stand-alone vapor compression System and vapor Absorption refrigeration System. The energetic and rational efficiencies of the proposed System, with n-pentane as an ORC working fluid, are calculated as 79.02% and 46.7%, respectively. Effects of variation in different operating parameters as well as organic working fluid on energetic and exergetic efficiencies have been studied. The coefficient of structural bond analysis demonstrates that the evaporator and cascade condenser operating temperature significantly affects the System performance. The proposed trigeneration System powered by waste heat is independent of the grid supply; however, a stand-alone vapor compression refrigeration System requires about 19.15 kWe to meet the equivalent cooling demand. The decision of selection between the stand-alone System and the proposed trigeneration System is influenced by the compressor capacity of stand-alone vapor compression refrigeration System, cost of unit electricity, compressor runtime, cost of organic Rankine cycle power block, and cost of vapor Absorption System. Based on the condition of equality of the annualized cost of the stand-alone System and proposed trigeneration System, a methodology for selection between these two configurations, called selection diagram, is also presented in this paper. The selection diagram gives quick suggestion about the optimal configuration at the initial design stage. The economic analysis reveals that the simple payback period and breakeven point for the proposed hybrid System are 6.2 years and 4.9 years, respectively.