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Post by Deleted on Apr 15, 2016 3:13:14 GMT
Another heat-to-electricity system was announced. Here's the important bits: April 13, 2016
ORC Module 125EJW
The newly developed waste heat recovery system "Hydrocurrent Organic Rankine Cycle (ORC) Module 125EJW" 1 by MHI Marine Machinery & Engine Co., Ltd. (President: Kazuo Soma, Head Office: Nagasaki) has begun operation on the vessel named Arnold Maersk belonging to Maersk Line.
The ORC system enables the utilization of extremely low temperature heat sources to generate electrical power at low-cost and high-efficiency in marine applications. In concrete terms, the system generates electricity using the waste heat of the main engine jacket cooling water (approx. 85°C)(185°F), and by reducing the load on the vessel's main generator, cuts CO2 emissions and improves the efficiency of the vessel's plant.
The ORC has an output of 125 kW and is fitted to the Arnold Maersk. Prior to this, a pilot ORC machine completed performance testing at the factory of Calnetix Technologies who is a partner of MHI Marine Machinery & Engine, gaining the approval of ClassNK and Lloyd's Register of Shipping in 2015.
As some of you know, i am fond of the idea of solar-boosted OTEC on small seasteads, where one roof covers one person's living space, their dock space, work space, etc etc. I figure if you can see actual roof, then someone ran short on solar collectors or planters. While this new Maersk system operates at 85C/185F, systems have been operated at lower temperatures. In addition, this system is designed to operate against surface temperature water as it's cold side, not deep cold water from 300m/1000ft (or deeper) down.
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Post by Deleted on Apr 15, 2016 13:21:16 GMT
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Post by johngalt on May 11, 2016 15:28:25 GMT
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Post by jeff on Jan 15, 2017 20:06:42 GMT
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Post by jeff on Jan 15, 2017 20:29:14 GMT
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Post by jeff on Jan 16, 2017 6:25:37 GMT
Self-pumping solar heating system with geyser pumping action US 4478211 A ABSTRACT A self-pumping solar heating system having a collector including a multitude of small diameter riser tubes from which heated liquid is pumped into a header by a geyser action. A vapor condenser assures a header pressure conducive to bubble nucleation in the riser tube upper end segments. The level of liquid within the header or its outlet is higher than the liquid level in the riser tubes to produce a gravity imbalance capable of circulating heated liquid past a storage heat exchanger, below the header, and then upwardly through the closed vapor condenser in the header prior to return to a collector inlet manifold. A modified header utilizes an open vapor condenser in vapor communication with the collector header. www.google.com/patents/US4478211patentimages.storage.googleapis.com/pages/US4478211-1.pngpatentimages.storage.googleapis.com/pages/US4478211-2.png
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Post by jeff on Jan 16, 2017 6:44:40 GMT
ABSTRACT Solar thermal water heating systems reduce household energy bills by using the free solar radiation provided by the sun to heat water for residential needs. In order to eliminate the need for electricity to run a pump to drive the fluid circulation in these systems, fluid buoyancy effects can be employed to move the fluid from lower elevations to higher elevations. There are several operational challenges with conventional “thermosyphon” systems, such as reversing flow and overheating, which can all be addressed by using a geyser pump mechanism. Although the solar thermal geyser pump water heating system has been on the market, little research has been done on the optimization of the system to improve its efficiency. Engineering Equation Solver (EES) and the Transient System Simulation Tool (TRNSYS) were used to implement a mathematical model for the geyser pump system operation under transient weather conditions. The model allows for parametric studies of the design attributes to investigate optimum efficiency conditions for the thermally driven pump. www.researchgate.net/publication/262566728_Geyser_Pump_Solar_Water_Heater_System_Modeling_Design_Optimizationwww.researchgate.net/profile/Jeffrey_Brownson/publication/262566728/figure/fig2/AS:296819390205955@1447778665335/Fig-2-Geyser-Pump-Flow-Schematic.png
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Post by jeff on Jan 20, 2017 2:52:55 GMT
Using about 600 available TEG (Thermoelectric Generator) modules, combined with a hot-side at 200*C and a cold-side at 20*C would put 2kW output. A 1 KW Thermoelectric Generator for Low-temperature Geothermal Resources pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2014/Li.pdfI am suggesting the use of the Sorensen Solar Bubble Pump to push heated fluid down through the hot-side coils, then deep enough to cool the water sufficiently to return to the cool side, in a closed loop, rather than typical OTEC that requires the use of the ocean temperature gradient, as well as mechanical pumping, and mechanical conversion of heat to electricity. Call it 8-12 kWh/day, for a small home? Granted, it would need storage for night use, but a decent flow-battery with a 1 cubic meter tank can store a month worth of energy...
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