C. P. Jawahar

C. P. Jawahar

M.Tech.,Ph.D.,

About

41
Publications
6,246
Reads
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659
Citations
Additional affiliations
May 2012 - present
Karunya University
Position
  • Professor (Associate)
April 2011 - April 2012
Karunya University
Position
  • Professor (Assistant)
December 2007 - March 2011
Anna University, Chennai
Position
  • Senior Researcher
Education
December 2007 - March 2011
Anna University, Chennai
Field of study
  • Refrigeration and Airconditioning
July 1999 - December 2000
National Institute of Technology Tiruchirappalli
Field of study
  • Energy Engineering
August 1994 - May 1998
Madurai Kamaraj University
Field of study
  • Mechanical Engineering

Publications

Publications (41)
Article
Thermosyphon operating with refrigerants are usual choices for low temperature heat transfer applications. The present study focuses on the performance evaluation of thermosyphons employing refrigerant R134a and Al2O3/R134 as working fluids, with novel designs to enhance the heat transfer. Two designs are proposed in the study in which eight intern...
Article
Nanorefrigerants are mixtures of refrigerant and nanoparticles, which enhance the heat transfer in both air-conditioning and refrigeration systems. In the present work, the nanorefrigerant Al 2 O 3 /R134a is applied in a two-phase closed thermosyphon in order to investigate its thermal performance. More specifically, the influence of the Al 2 O 3 /...
Article
Full-text available
A Crossflow turbine is a device used to generate power from hydro, which is a renewable source of energy. The salient feature of this turbine is its simplicity in construction. In the past few decades, variables such as flow diverter, air holes, bidirectional flow were introduced in the turbine design to improve its efficiency. This paper presents...
Article
The performance of cylindrical thermosyphon with two modified designs is evaluated using environment-friendly refrigerant water. Modified designs 1 and 2 refers to the incorporation of a cone frustum at the bottom and top of the adiabatic section in the thermosyphon, respectively. The variations in the temperature along with the height and heat tra...
Article
This paper presents the energy analysis of a triple effect absorption compression (hybrid) cycle employing ammonia water as working fluid. The performance parameters such as cooling capacity and coefficient of performance of the hybrid cycle is analyzed by varying the temperature of evaporator from −10 °C to 10 °C, absorber and condenser temperatur...
Article
The present work is focused on the production, emission and performance characteristics at variable compression ratios (CRs) on a compression ignition multi-fuel engine using Argemone Mexicana oil methyl ester and its blends with diesel (on a quantity basis) was observed and compared with the same. The feasibility of employing Argemone Mexicana oil...
Article
The dwindling of natural resources such as crude oil, coal etc. has made it essential to switch over to biodiesel. Biodiesel has a number of properties which are beneficial to the environment. The main advantage of biodiesel is that it's carbon neutral and it does not create carbon dioxide (CO2). In addition, it leads to a decrease in pollution by...
Article
Full-text available
The ever increasing demand from the industry and transport sector has led to an increased requirement of diesel and other oil products. These fuels belong to the non-renewable resources, their continuous availability is uncertain for the future. These factors along with the political instability causes fluctuating prices and supply of diesel .These...
Article
The performance of a parabolic dish type solar collector is investigated in this paper. The collector is located at Karunya University, Coimbatore (Longitude 76o59’ and Latitude 11o00’) Tamil Nadu. The diameter of the collector is 1180 mm with the depth of 310 mm. The diameter of the absorber which is made up of copper is about 75mm and height is 2...
Article
Full-text available
There is a fast depletion of renewable sources that was used in the past for the generation of electricity and the difficulty in reachability of the grid supply to the remote villages was a big challenge faced. The best possible remedial measure in this scenario is to make use of the natural resources available to generate electricity. In an endeav...
Article
Full-text available
Our society is highly dependent on petroleum for its activities. However, petroleum is a finite source and causes several environmental problems such as rising carbon dioxide levels in the atmosphere. About 90% of petroleum produced is used as an energy source for transportation, heat and electricity generation, and the remaining sources used as fe...
Article
In recent years design of micro hydro power plants has been examined by various groups throughout the world due to its merits of offering better performance than the conventional fossil fuels to meet the energy need. Considering the portfolio of energy, the improvement of hydro power will partake in decrease of greenhouse gas emission and better ma...
Conference Paper
India is the second most populous country in the world with over 1.21billion people (estimated for April, 2011), more than sixth of the world’s population. India is projected to be world’s most populous country by 2025,surpassing china, its population exceeding 1.6 billion people by 2050.Comparing with the population there are 2.65 million cars sol...
Conference Paper
Increasing industrialization and motorization has led to a significant rise in demand of petroleum products. As these are the non-renewable resources it is difficult to predict availability of these resources in future, resulting in uncertainty in its supply and price and is impacting growing economies like India importing 80% of the total demand o...
Conference Paper
Our society is highly dependent on petroleum for its activities. However, petroleum is a finite source and pollutes the environmental. About 90% of petroleum produced is used as an energy source for transportation, heat and electricity generation, and the remaining sources used as feed stocks in the chemical industry. As demands for energy is incre...
Conference Paper
There is a fast depletion of renewable sources that was used in the past for the generation of electricity and the difficulty in reachability of the grid supply to the remote villages was a big challenge faced. The best possible remedial measure in this scenario is to make use of the natural resources available to generate electricity. In an endeav...
Article
This paper deals with the use of an air-cooled condenser in a low-temperature flash evaporation desalination system, suitable for small-scale applications. A small-scale desalination system has been designed to operate at an evaporator pressure of 0.2 bar and the performance of the system is evaluated for different inlet feed water temperatures bet...
Conference Paper
In present scenario, water cooler and air conditioner systems are widely used for cooling purpose. Besides it’s wide usage and applications, it has some demerits and environment related problems. It has been observed during last two decades that O3 layer is slowly destroyed because of refrigerant (CFC, HFC) used for refrigeration and airconditionin...
Conference Paper
In the present work, Thermodynamic analysis of solar powered half effect water-lithium bromide absorption cycle for cooling and power applications has been carried out. The system is simulated for generator temperature between 50°C to 80°C, sink temperature 20°C to 35°C and evaporator temperatures between 2.5°C to 10°C. Refrigerant coming from the...
Conference Paper
Thermodynamic analysis of solar operated half effect ammonia-water absorption compression (hybrid) cycle has been carried out, the system is simulated for generator temperature, sink temperature, evaporator Temperature. To enhance the performance of the conventional half effect cycle it is modified by incorporating a compressor, the COP of the hybr...
Conference Paper
Thermodyanamic analysis of ammoniasodium thiocyanate half effect absorption compression ( hybrid ) cycle has been carried out. The system is simulated for generator temperature, sink temperature and evaporator temperature for different ranges. To enhance the performance of the conventional half effect cycle is modified by incorporating a compressor...
Conference Paper
In the present work, thermodynamic analysis of solar operated half effect ammonia-lithium nitrate absorption compression (hybrid0 cycle has been carried out. The system is simulated for generator temperature between 50°C to 80°C, sink temperature 25°C to 40°C and evaporator temperature between -10°C and 10°C. To enhance the performance, the convent...
Conference Paper
The performance of a parabolic dish type solar collector is investigated in this paper. The collector is located at Karunya University, Coimbatore (Longitude 76o59’ and Latitude 11o00’) Tamil Nadu. The diameter of the collector is 1180 mm with the depth of 310 mm. The diameter of the absorber which is made up of copper is about 75mm and height is 2...
Conference Paper
In recent years, the concept of combined cooling and power cycle employing ammonia-water as the working fluid have gained greater attention. Improving the performance of such combined cycle has always been a great challenge to the research community. This paper presents the simulation studies on a single stage absorption compression (hybrid) cycle,...
Conference Paper
Large scale biodiesel production by using low cost and abundant feedstock as waste animal fat is becoming more important due tocrisis in petroleum reserves and adverse environmental problems.In the present study an environmentally friendly bio refinery process for producing biodiesel from animal fat was performed. Animal fat oil was obtained by mod...
Conference Paper
Thermodynamic analysis of two stage triple effect absorption cooling and power cycle employing ammonia-water as the working fluid is carried out. Two type of configurations namely type A (power sub-cycle in low temperature stage) and type B (power sub-cycle in high temperature stage) is analyzed. The cycle is simulated for various evaporator, sink...
Conference Paper
As a renewable, sustainable and alternative fuel for compression ignition engines, bio diesel instead of diesel has been increasingly fueled to study its effects on emissions in recent years. The use of bio diesel leads to the substantial reduction in PM, HC and CO emissions accompanying with the imperceptible power loss, the increase in fuel consu...
Conference Paper
In this paper, the effect of relative humidity on the performance of an air-cooled modified generator absorber heat exchange (GAX) absorption heat pump is presented. The system is oil fired and utilizes ammonia-water as the working fluid. The modified GAX heat pump comprises of GAX arrangements at high and low pressure side, condensate pre-cooler,...
Conference Paper
A thermodynamic analysis of a two stage absorption cooling and power cycle using ammonia-water as the working fluid is carried out and is compared with that of a single stage cycle. The cycle is simulated for evaporator temperatures between -10°C, and 10°C, absorber and condenser temperatures between 25°C and 45°C. The cooling capacity and power ou...
Conference Paper
A modified generator absorber heat exchange (GAX) based absorption heat pump is analyzed in both heating and cooling modes powered by solar energy in this paper. The heat pump designed for a cooling capacity of 10.6 kW utilizes ammonia-water as the working fluid. The effects of the temperatures of absorber, condenser and evaporator on the coefficie...
Article
A detailed parametric analysis is carried out on both simple and GAX based combined power and cooling cycle. The effect of various parameters such as heat source temperature, refrigeration temperature, sink temperature, split ratio (refrigerant flow ratio between power and cooling systems), split factor (solution flow ratio between absorber and GAX...
Conference Paper
In the recent years, research has been focused on the development of application software to handle non linear problems. The artificial neural network is one such tool that has received increased attention in the system modeling and simulation field due to their learning ability and versatile mapping capabilities. In this paper, the performance eva...
Article
An experimental investigation on the performance of an air-cooled modified generator absorber heat exchange (GAX) absorption cooling system has been carried out and presented in this paper. The conventional system is modified by incorporating high pressure GAX, low pressure GAX, a solution cooler and an additional solution heat exchanger to reduce...
Conference Paper
A detailed parametric analysis is carried out on both simple and GAX based combined power and cooling cycle. The effect of various parameters such as heat source temperature, refrigeration temperature, sink temperature, split ratio (refrigerant flow ration between power and cooling systems), spilt factor (solution flow ratio between absorber and GA...
Article
An ammonia–water (NH3–H2O) absorption cooling system is analyzed using the pinch point analysis, to recover maximum internal heat from the streams, thereby increasing the system performance. The system is simulated for generator temperatures between 120 °C and 150 °C, sink temperatures between 25 °C and 45 °C and evaporator temperatures between −10...
Article
GAX based absorption cooling systems have been investigated in recent years by various groups across the world due to their advantage of offering a higher performance compared to that of the conventional ammonia-water absorption systems. In this paper, a comprehensive review of several different GAX cycle configurations has been explained in detail...
Conference Paper
An experimental investigation on the influence of sink temperature on the performance of the modified generator absorber heat exchange (GAX) absorption cooling system is presented. The system is oil fired and designed for a cooling capacity of 10.5 kW using ammonia-water as working fluid pair. Apart from the conventional solution heat exchanger, th...
Conference Paper
The artificial neural network (ANN) is an application software tool that had received increased attention in the system modeling and simulation field due to their learning ability and versatile mapping capabilities. ANNs have been applied to various thermal systems to predict their performances. In this paper, performance evaluation of the biomass...

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