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This research paper investigates the impact of variation in the number of collectors (N) and mass flow rate (ṁfr) on yearly overall energy, exergy, and efficiency of a dual-slope solar desalting unit incorporated with N number of photovoltaic thermal flat plate collectors (NPVTFPC-DSU). The denouement of this research work will be useful for the designer and installer of such a system in deciding the number of collectors according to the requirement. An exhaustive calculation is carried out considering all four kinds of climatic conditions in each month of the year for the weather of New Delhi, India. Fundamental equations of NPVT-FPC-DSU and all pertinent sets of values have been dined to the data processing code developed in MATLAB to estimate annual freshwater production, energy, thermal and electrical exergies, overall energy, exergy, and efficiency. Finally, values of these parameters except annual overall electrical energy recede with the augmentation in ṁfr value, and they become approximately constant exceeding ṁfr value of 0.10 kg/s. Conversely, an increase in the values of the above-mentioned parameters has been obtained with the increase in the value of N. Moreover, the optimum value of N is found to be 4 and 8 from yearly overall energy and exergy efficiency viewpoints, respectively [ABSTRACT FROM AUTHOR]

River Yamuna is an important river in India that flows through the national capital--New Delhi. The river water offers a variety of functional uses in its basin area. A progressive deterioration of river water quality had rendered it to become almost a channel of wastewater. However, there is a willingness-to-pay (WTP) for the conservation of river water quality among the citizens of the basin. This paper reports on an application of Contingent Valuation Method (CVM) for estimating the economic value of river water conservation (both for current water quality maintenance and for the restoration of river water quality). The results show that there exists a WTP for the conservation of river water quality, which is about 14.93% higher for water quality restoration than that for maintenance of current water quality. Some of the issues in undertaking the CVM studies in developing countries are also discussed in the paper. [ABSTRACT FROM AUTHOR]