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Black Forest, CO, United States

Arunkumar T.,Anna University | Denkenberger D.,Denkenberger Inventing and Consulting | Velraj R.,Anna University | Sathyamurthy R.,Hindustan University | And 2 more authors.
Energy Conversion and Management | Year: 2015

This paper presents a modification of parabolic concentrator (PC) - solar still with continuous water circulation using a storage tank to enhance the productivity. Four modes of operation were studied experimentally: (i) PC-solar still without top cover cooling; (ii) PC-solar still with top cover cooling, PC-solar still integrated with phase change material (PCM) without top cover cooling and PC-solar still integrated PCM with cooling. The experiments were carried out for the cooling water flow rates of 40 ml/min; 50 ml/min, 60 ml/min, 80 ml/min and 100 ml/min. Diurnal variations of water temperature (Tw), ambient air temperature (Ta), top cover temperature (Toc) and production rate are measured with frequent time intervals. Water cooling was not cost effective, but adding PCM was. © 2015 Elsevier Ltd. All rights reserved. Source


Arunkumar T.,NGP | Denkenberger D.,Denkenberger Inventing and Consulting | Ahsan A.,University Putra Malaysia
Desalination | Year: 2013

In order to augment the efficiency and distillate yield in the concentrator-coupled hemispherical basin solar still, a phase change material (PCM) was added. Two modes of operation have been studied experimentally, (1) single-slope solar still without the PCM effect, and (2) single-slope solar still with the PCM effect. The temperature of water (Tw), temperature of PCM (TPCM), air temperature (Tair), inner cover temperature (Tic) and outer cover temperature (Toc) were measured. Experimental results indicate that the effect of thermal storage in the concentrator-coupled hemispherical basin solar still increases the productivity by 26%. It was concluded that the productivity greatly increased due to the still integrated with PCM. © 2013 Elsevier B.V. All rights reserved. Source


Succar S.,Natural Resources Defense Council | Succar S.,Princeton Environmental Institute | Denkenberger D.C.,Denkenberger Inventing and Consulting | Williams R.H.,Princeton Environmental Institute
Applied Energy | Year: 2012

A methodology is presented for jointly optimizing the wind turbine specific rating and the storage configuration for a large-scale wind farm coupled to compressed air energy storage (CAES). By allowing the wind-storage system to be optimized in an integrated, variable rating framework the levelized cost of electricity (LCOE) can be reduced substantially. These changes also enhance the capacity factor of the wind farm, reduce the storage capacity requirements of the baseload plant and reduce the greenhouse gas emission rate of the combined system relative to a separately optimized wind farm coupled to CAES. The results of this analysis could have important implications for the competitiveness of large-scale remote wind and the applicability of energy storage as a baseload wind strategy in a carbon constrained world. © 2011 Elsevier Ltd. Source


Denkenberger D.,Denkenberger Inventing and Consulting | Ahsan A.,University Putra Malaysia | Okundamiya M.S.,Ambrose Alli University | kumar S.,Energy and Environmental Research Center | And 2 more authors.
Desalination | Year: 2012

This work reports a new design of solar still with a hemispherical top cover for water desalination with and without flowing water over the cover. The daily distillate output of the system is increased by lowering the temperature of the cover by water flowing over it. The fresh water production performance of this new still was observed in Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore (11° North, 77° East), India. The efficiency was 34%, and increased to 42% with the top cover cooling effect. Diurnal variations of a few important parameters were observed during field experiments such as water temperature, cover temperature, air temperature, ambient temperature and distillate output. Solar radiation incident on a solar still is also discussed here. © 2011 Elsevier B.V. Source


Ahsan A.,University Putra Malaysia | Denkenberger D.,Denkenberger Inventing and Consulting | Okundamiya M.S.,Ambrose Alli University
Applied Energy | Year: 2013

This work reports an innovative design of tubular solar still with a rectangular basin for water desalination with flowing water and air over the cover. The daily distillate output of the system is increased by lowering the temperature of water flowing over it (top cover cooling arrangement). The fresh water production performance of this new still is observed in Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore (11° North, 77° East), India. The water production rate with no cooling flow was 2050. ml/day (410. ml/trough). However, with cooling air flow, production increased to 3050. ml/day, and with cooling water flow, it further increased to 5000. ml/day. Despite the increased cost of the water cooling system, the increased output resulted in the cost of distilled water being cut in roughly half. Diurnal variations of a few important parameters are observed during field experiments such as water temperature, cover temperature, air temperature, ambient temperature and distillate output. © 2012 Elsevier Ltd. Source

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