Development of Seawater Distiller utilizing Waste Heat of Portable Electric Generators
01 Jun 2010-Transactions of The Korean Society of Mechanical Engineers B (The Korean Society of Mechanical Engineers)-Vol. 34, Iss: 6, pp 607-613
TL;DR: In this article, a seawater distiller with a multiple-effect diffusion still was designed, in which the waste heat from a portable electric generator was used, and a series of closely spaced parallel partitions were placed in contact with saline-soaked wicks.
Abstract: A seawater distiller, in which the waste heat from a portable electric generator was used, with a multiple-effect diffusion still was designed. The waste gas from small generators commonly used in islands has not yet been used because it has less thermal energy; however, this waste gas can be used as a heat source for small-capacity distillers and as an additional heat source for solar stills. The proposed distiller comprises a series of closely spaced parallel partitions that are placed in contact with saline-soaked wicks. In the distiller, evaporation and condensation processes are repeated to recycle the thermal energy for increasing the distillate productivity. Experimental results show that the proposed distiller with only one-effect still can produce at least 6.7 kg/day of distilled water; the proposed distiller with a ten-effect still is expected to produce 43 kg/day of distilled water. This amount of distillate is approximately four times the maximum daily productivity of the solar stills, as determined in outdoor experiments.
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TL;DR: In this article, a hybrid multiple-effect diffusion solar still (HMED) operating with various heat sources, such as solar thermal energy, electric heater and waste heat, is proposed.
21 citations
TL;DR: In this article, the authors focused on finding the maximum productivity by optimizing vertical multi-effect diffusion solar distiller (VMED) and lowering the water cost of that, and the numerical model of the VMED was experimentally validated, and then used to find the optimal conditions for the essential variables.
17 citations
TL;DR: In this article, a seawater distiller utilizing the thermal energy of solar radiation and waste gas from a small electric generator was designed and constructed with a number of configurations to improve its performance.
Abstract: A seawater distiller utilizing the thermal energy of solar radiation and waste gas from a small electric generator was designed and constructed with a number of configurations to improve its performance. The distiller constructed is a combined model of a basin-type solar still and a vertical multiple-effect diffusion still, consisting of a series of closely spaced parallel plates in contact with saline-soaked wicks. Evaporation and condensation processes were repeated on all the plates by recycling thermal energy to increase distillate productivity in the still. Tests were performed with waste heat of actual exhaust gas from a portable electric generator, changing various experimental conditions such as feeding flow rate of seawater to the wicks, seawater level of the basin, and use of reflecting plate fins. Experimental results show that our two-effect distiller produces 17.1–19.6 kg/(m2 d) at 3,000 kJ/h and has a Performance Ratio of 14.8–16.9.
12 citations
TL;DR: Wang et al. as mentioned in this paper developed a novel multi-effect diffusion solar distiller (MED) to improve the performance and reliability of conventional MED, where the new wick-free plates (WFPs) have many horizontally patterned grooves on an evaporation surface of a flat plate and can evenly spread and retain the feed saline water on the surface like as fabric wick.
11 citations
TL;DR: In this paper, an evaporation-type seawater distiller using waste heat of exhaust gas from a portable electric generator was designed to produce at least 6.7 kg/d of distilled water only with a one-effect still and is expected to produce 43kg/d with a ten effect still.
Abstract: We have designed an evaporation-type seawater distiller using waste heat of exhaust gas from a portable electric generator. Waste gas from the small generator commonly used in islands has not been utilized because of its low energy density, which may be used as heating source of a small-capacity distiller as well as an additional heat source for solar stills. The proposed distiller of a multiple-effect diffusion still type consists of a series of closely-spaced parallel partitions in contact with saline-soaked wicks. In the distiller, evaporation and condensation processes are repeated as much as its effect number to recycle the thermal energy, resulting in increasing the system thermal efficiency. Experimental results show that the proposed distiller can produce at least 6.7 kg/d of distilled water only with a one-effect still and is expected to produce 43 kg/d with a ten-effect still. This amount of distillate is 4 times larger than the maximum daily productivity of solar stills obtained by outdoor expe...
6 citations
References
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TL;DR: Tanaka et al. as discussed by the authors constructed a basin-type, multiple-effect, diffusion-coupled solar stills consisting of a tilted double glass cover, a horizontal basin liner and a number of closely spaced vertical partitions in contact with saline-soaked wicks.
79 citations
TL;DR: In this paper, a parametric investigation was theoretically performed for the vertical multiple-effect diffusion-type solar still, which consists of a number of vertical partitions in contact with saline-soaked wicks with narrow gaps between the partitions, coupled with a heat-pipe solar collector.
68 citations
TL;DR: In this paper, a multiple-effect diffusion still was theoretically analyzed taking variations of the boiling point elevation (BPE) into account, and it was shown that a series of seawater-soaked wicks stuck on closely-spaced parallel plates with the first plate steam-heated at 100°C and the last plate cooled in 30°C ambient air can produce highly concentrated seawater.
44 citations