Solar Thermal Water Pumps: A Preliminary Analysis of the Working Process

2005 ◽  
Vol 127 (1) ◽  
pp. 29-36 ◽  
Author(s):  
K. Mahkamov ◽  
E. P. Orda
Keyword(s):  
Mathematical Model ◽  
Thermal Water ◽  
Low Cost ◽  
Thermodynamic Cycle ◽  
Solar Thermal ◽  
Maximum Temperature ◽  
Working Fluid ◽  
Water Pump ◽  
Dynamic Head ◽  
Water Pumps

Solar thermal water pumps are low cost and low maintenance devices with a pumping capacity of 0.2-1m3/hour at a dynamic head of 1.5–5 m. The working fluid in the thermodynamic cycle is an air-steam mixture. In this paper we suggest a simple mathematical model to numerically simulate the internal processes in such a pump and determine the performance and physical dimensions of a preliminary design. The proposed mathematical model has been calibrated against experimental data and it provides the numerical simulation of the processes which occur in the cycle within an acceptable degree of accuracy for engineering purposes. The results of the analysis show that the performance of the solar water pump is mainly determined by the “steam” fraction of the cycle. The power of the solar thermal water pump increases with an increase in the maximum temperature in the cycle, while the indicated efficiency reduces because of the increase in the heat loss due to water vaporization and condensation processes.

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

2004 ◽  
Vol 126 (2) ◽  
pp. 768-773 ◽  
Author(s):  
E. Orda ◽  
K. Mahkamov
Keyword(s):  
Developing Countries ◽  
Flat Plate ◽  
Thermal Water ◽  
Experimental Tests ◽  
Heating System ◽  
Solar Thermal ◽  
Solar Collectors ◽  
Dynamic Head ◽  
Simple Technology ◽  
Water Pumps

Solar water pumps, based on electro-mechanical pumps powered by PV arrays, are commonly used and commercially available. However, one of the difficulties for their wider application in developing countries, where there is a high average insolation, is their relatively excessive cost. This arises mainly due to the high cost of the PV elements. Hence, this paper describes some developmental work and results of experimental tests on “low-tech” solar thermal water pumps which were built on the basis of Stirling engines with fluid pistons coupled to flat-plate solar collectors. Temperatures and pressures in the cycle are comparatively low, thus cheap design materials, such as glass and plastic, and a simple technology, available in the majority of mechanical workshops, can be used for their manufacture and consequently reduce their cost. Several design modifications of the above solar thermal water pumps have been developed and tested. The results obtained demonstrate that existing installations can be effectively applied for water pumping with a dynamic head which varies between 2-5 m. Furthermore, data from experimental tests shows that the pulsating motion of water in channels of the flat-plate solar collectors increases the collector’s efficiency by approximately 8-10%, which is a considerable advantage when a pump is used as part of a house solar heating system.

A solar thermal water pump

1996 ◽  
Vol 53 (3) ◽  
pp. 235-243 ◽  
Author(s):  
K. Sumathy ◽  
A. Venkatesh ◽  
V. Sriramulu
Keyword(s):  
Thermal Water ◽  
Solar Thermal ◽  
Water Pump

Parametric Consideration of a Thermal Water Pump and Application for Agriculture

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Jirawat Sitranon ◽  
Charoenporn Lertsatitthanakorn ◽  
Pichai Namprakai ◽  
Naris Prathinthong ◽  
Taveewat Suparos ◽  
...  
Keyword(s):  
Thermal Water ◽  
Cooling Water ◽  
Check Valve ◽  
Working Fluid ◽  
Electric Heater ◽  
Feed Water ◽  
Vapor Flow ◽  
Pump Efficiency ◽  
Water Tank ◽  
Water Pump

This research studied the effects of suction heads on the efficiency of a thermal water pump with steam. In order to save energy, the authors also studied the appropriate amount of air added to a steam working fluid. Cooling time was attempted to be shorten, direct contact cooling was employed. The system comprised feed water tank (FT), liquid piston tank (LT), heat tank (HT), storage tank (ST), well tank (WT), and check valve (CV). It was directly cooled by cooling water. Thermal energy input was supplied by an electric heater as a substitute of heat sources such as firewood. An operation of the pump consisted of five stages: heating, pumping, vapor-flow, cooling, and suction. In conclusion, increasing the suction head raised the pumping efficiency until the maximum was achieved. Using air in conjunction with the steam working fluid could lower the working temperature suitable for solar application. In addition, the simulation of a thermal pump with steam was merely presented. A good agreement between the test and the model was found. The larger pump size was selected to be constructed and tested in order to increase the pump efficiency. Agricultural application of the larger pump could obtain energy source from waste of firewood at no cost.

Thermodynamic analysis of a solar thermal water pump

Solar Energy ◽  
1996 ◽  
Vol 57 (2) ◽  
pp. 155-161 ◽  
Author(s):  
K. Sumathy ◽  
A. Venkatesh ◽  
V. Sriramulu
Keyword(s):  
Thermodynamic Analysis ◽  
Thermal Water ◽  
Solar Thermal ◽  
Water Pump

scholarly journals Assembly of Janus complex with low-cost and salt rejection for solar-thermal water evaporation

2020 ◽  
Vol 55 (32) ◽  
pp. 15551-15561
Author(s):  
Dingding Li ◽  
Qingxin Zhou ◽  
Gang Wang ◽  
Hang Zhao ◽  
Shenghua Ma ◽  
...  
Keyword(s):  
Thermal Water ◽  
Low Cost ◽  
Solar Thermal ◽  
Water Evaporation ◽  
Salt Rejection

Development of a solar (thermal) water pump prototype—An Indo-Swiss experience

Solar Energy ◽  
1986 ◽  
Vol 36 (3) ◽  
pp. 257-265 ◽  
Author(s):  
V.V.N. Kishore ◽  
M.R. Gandhi ◽  
N. Pathak ◽  
S.D. Gomkale ◽  
K.S. Rao ◽  
...  
Keyword(s):  
Thermal Water ◽  
Solar Thermal ◽  
Water Pump ◽  
Swiss Experience
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