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Purnima Jalihal

Bio: Purnima Jalihal is an academic researcher from National Institute of Ocean Technology. The author has contributed to research in topics: Oscillating Water Column & Low-temperature thermal desalination. The author has an hindex of 7, co-authored 31 publications receiving 221 citations.

Papers
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Journal ArticleDOI
01 Sep 2004-Energy
TL;DR: In this paper, a scheme for running the reverse osmosis (RO) based desalination plant using wave power has been proved and the system has been successfully commissioned and the scheme was found to be successful.

69 citations

Journal ArticleDOI
TL;DR: In this paper, a bidirectional flow impulse-turbine used in a wave energy harvesting system has efficiency less than 40%, and it is required to design the turbine for a higher efficiency.

43 citations

Journal ArticleDOI
TL;DR: Marine renewable energy has the potential to solve both the energy-security and coastal-protection problems affecting coastal societies as mentioned in this paper, however, the potential benefits arising from the com-pany is limited.
Abstract: Marine renewable energy has the potential to solve both the energy-security and coastal-protection problems affecting coastal societies. In this article, the potential benefits arising from the com...

35 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used steam accumulators as buffer storage in direct steam generation (DSG) for correcting the mismatch between production and consumption and also for energy storage, and a parametric analysis was performed to investigate the impact of steam accumulator volume and also the irradiance disturbance in solar field's performance.

17 citations

Journal ArticleDOI
TL;DR: In this article, a barometric sealed flash evaporative desalination system was designed to ensure effective utilization of waste heat energy from a process plant, and the influence of plant operating variables on fresh water generation using low grade thermal energy is experimentally studied.

14 citations


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01 Jan 2010
TL;DR: A 23-year database of calibrated and validated satellite altimeter measurements is used to investigate global changes in oceanic wind speed and wave height over this period and finds a general global trend of increasing values of windspeed and, to a lesser degree, wave height.
Abstract: Wind speeds over the world’s oceans have increased over the past two decades, as have wave heights. Studies of climate change typically consider measurements or predictions of temperature over extended periods of time. Climate, however, is much more than temperature. Over the oceans, changes in wind speed and the surface gravity waves generated by such winds play an important role. We used a 23-year database of calibrated and validated satellite altimeter measurements to investigate global changes in oceanic wind speed and wave height over this period. We find a general global trend of increasing values of wind speed and, to a lesser degree, wave height, over this period. The rate of increase is greater for extreme events as compared to the mean condition.

737 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide an updated review of studies related to membrane modules (plate and frame, tubular, spiral wound, and hollow fiber) and membrane characterization and discuss membrane cleaning and different pre-treatment technologies in place for RO desalination, such as feed-water pretreatment and biocides.

660 citations

Journal ArticleDOI
TL;DR: A survey of the available literature on energy intensity for water use in the municipal and agricultural sectors and separating the process into several stages is presented in this article, where water supply, water treatment, residential end use, wastewater treatment, and agriculture end use are considered.
Abstract: Energy is consumed at every stage of the cycle of water supply, treatment, use and disposal. The intensity of energy consumption (kW h/m 3 ) depends upon the specific technologies applied at each stage of the water cycle. For some technologies, the intensity may be relatively low, whereas the intensity of other technologies is substantially greater. This report surveys the available literature on energy intensity for water use in the municipal and agricultural sectors and separates the process into several stages. Water supply, water treatment, residential end use, wastewater treatment, and agriculture end use are considered. Representative values of the energy consumed per unit water are given for a broad range of processes. Water extraction and pumping from ground and surface sources is considered. The energy intensity of treatment required for different types of water source is found to vary widely between the extremes of relatively fresh surface waters, which use energy mainly in pumping, and seawater, which requires desalination. Energy usage for different methods of irrigation including pressurized as well as surface irrigation is studied. The energy intensity of residential end use is very high relative to other parts of the water supply cycle. Processes such as heating water, washing clothes and dishes, and cooking are briefly studied within the water end-use stage. Hot water usage is responsible for making end use the most energy intensive stage of the water cycle. Hot water use in different buildings is briefly reviewed. Wastewater treated with various processes is considered, and the energy intensity is found to be highest when advanced wastewater treatment methods are applied. Energy consumption in the agricultural sector, which is principally related to irrigation pumping, is generally of lower energy intensity than for the municipal treatment or end use.

490 citations

Journal ArticleDOI
TL;DR: In this article, the authors provide a review on membrane processes associated with renewable energies for seawater and brackish water desalination, including reverse osmosis, membrane distillation and electrodialysis.

433 citations

Journal ArticleDOI
Henrik Lund1
TL;DR: In this article, the authors present the results of analyses of large-scale integration of wind power, photo voltaic (PV) and wave power into a Danish reference energy system.

402 citations