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The term “polygeneration” is referred to as “an energy supply system, which delivers more than one form of energy to the final user”, for example: electricity, heating/cooling, desalination can be delivered from polygeneration process. The polygeneration demonstrates unique integration of energy efficiency and renewable energy. It is the next generation energy production technique with a potential to overcome intermittence of renewable energy, reduce cost of power generation and greenhouse gas emissions. The feasibility study of this paper is divided in three sections: In first section of this study, solar and biomass have been arranged to produce steam for power generation. In the second section, cooling is produced by vapor absorption refrigeration (VAR; LiBr-H 2 O) system as per demand load requirement using steam, extracted from pass-out turbine. In the last section of this paper, multi effect dehumidification (MED) water desalination is produced by using limited amount of heat from water vapor (refrigerant; H 2 O) through HE1 of VAR cooling system. [ABSTRACT FROM AUTHOR]

Abstract: In the past two decades, ground source heat pump (GSHP) system has made good impact on energy saving in the Western and European countries in heating/cooling and industrial applications. Their potential for reduction in CO2 emission has been very well utilized by these countries to contribute to a green environment. In this paper an attempt is made to give an overview about how India can benefit from this technology. The economic growth of India has huge impact on energy and environment of the country. Though Indian building sector is growing in multifold, still there is a demand for electricity to meet the needs of people. Any technology to reduce energy consumption will have great impact on people's life and economy. In this way a study has been carried out to estimate, to what extend the ground source heat pump technology can help India to reduce its energy demand and also save the environment. This study covers 10 provinces of northern part of India which require both heating and cooling. Based on the topography of the states, they are classified into severe winter states and moderate winter states for heating requirement. During winter period the conventional electric heaters consume electricity between 1416 and 7085GW annually and for the same heating load GSHP consumes only 471–1416GW. In summer months the electricity consumed by conventional air conditioner ranges between 5506 and 27,532GW and by GSHP it varies from 4811 to 14,440GW. The annual CO2 emission by the conventional systems used for heating and cooling vary between 5270 and 26,352millionkg of CO2. In the case of GSHP CO2 emission lies between 4022 and 12,071millionkg. It is estimated that by employing GSHP technology India can save annually a minimum electricity of 1639–18,700GW and CO2 emission of 1.3–14.2 million tons. [Copyright &y& Elsevier]

Abstract: This is the property of earth that at a depth of about 1.5 to 2m, the temperature of ground remains almost constant throughout the year. This constant temperature is called earth’s undisturbed temperature which remains higher than surface temperature of earth in winter season and vice versa in summer. For effective utilization of heat capacity of earth, the earth–air heat exchanger (EAHE) has to be designed. The EAHEs are considered as an effective passive heating/cooling medium for buildings. This is basically a series of metallic, plastic or concrete pipes buried underground at a particular depth through which the fresh atmospheric air flows and gets heated in winter and supplied to the building if at sufficiently high temperature and vice versa in summer. Till date many researchers have carried out a number of studies in designing, modeling and testing of EAHEs systems. This paper reviews on the experimental and analytical studies of EAHE systems around the world but the studies are mainly focused on EAHE systems at the Indian universities as of the end June, 2012. [Copyright &y& Elsevier]