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TECHNICAL PAPERS

Development of “Low-tech” Solar Thermal Water Pumps for Use in Developing Countries

[+] Author and Article Information
E. Orda, K. Mahkamov

School of Engineering, The University of Durham, Durham, DH1 3LE, UK

J. Sol. Energy Eng 126(2), 768-773 (May 04, 2004) (6 pages) doi:10.1115/1.1668015 History: Received February 01, 2003; Revised August 01, 2003; Online May 04, 2004
Copyright © 2004 by ASME
Topics: Pumps , Solar energy , Water
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References

Figures

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The general scheme of a laboratory prototype of a thermal converter. 1, 2-“hot” and “cold” co-axial cylinders, respectively; 3-water; 4, 5-expansion and compression spaces, respectively; 6-a regenerator; 7-a piston actuator; 8-a mechanical spring; 9-an inertial water column; 10-a diaphragm; 11-a pumping unit; 12-puppet valves; 13-an air space; 14-an electrical coil heater; 15, 16-heat exchangers, installed in the hot and cold cylinders, respectively; 17-a tubular cooler.
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The pumping capacity of the thermal converter as a function of the dynamic head
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Pumping capacity of the water pump as a function of the average temperature in its expansion space
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The general scheme of a rig for experimental testing of different solar collectors. 1-the water vessel; 2-an electrical pump; 3-solar collectors; 4-regulating valves; Tinlet-temperature of the water in the inlets of solar collectors; Toutlet-temperature of the water in the outlets of solar collectors.
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Efficiency of the collectors as a function of (a) the average temperature of the water in the collector (Tinlet+Toutlet/2) and (b) the parameter (Taverage+Tambient/I). (a) 1-single glazing, black chrome coating; 2-single glazing, flat black painting. (b) 1-single glazing, black chrome coating; 2-single glazing, no selective coating; 3-double glazing, selective coating; 4-evacuated tubes; 5-double glazing with reflective films, selective coating.
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The general scheme of the “U”-type prototype of the solar thermal water pump. 1, 2-the hot and cold cylinders; 3-solar collectors; 4-a cooler; 5-hydraulic pumps; 6-a radiator; 7-a water pool; 8-a main pumping unit; 9-puppet valves; 10-a pneumatic camera.
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Experimental performance of the “U”-type solar thermal water pump: 1-single glazing, black chrome coating; 2-single glazing, flat black painting
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Efficiency of the collectors, coupled to the “U”-type solar thermal water pump, as a function of the parameter (Taverage+Tambient/I): 1-single glazing, black chrome coating; 2-single glazing, flat black painting
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The general scheme of the test rig with the co-axial solar thermal water pump. 1, 2-co-axial hot and cold cylinders, respectively; 3-a set of brazed copper tube-and-fin collectors with a selective coating; 4-a water storage vessel; 5-a suction chamber; 6-a control valve; 7-a vacuum meter; 8-a discharging chamber; 9-a control valve; 10-a manometer; 11-a main pumping unit; 12-puppet valves; 13-a water jacket; H-the distance from the surface of the water in the storage vessel 4 to the level of the discharging chamber 8.
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The test rig with the co-axial solar thermal water pump

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