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Performance Analysis of a Pv Pump Harvesting Rain Water in the Drought Prone Area of Bangladesh

Khan Mamun Reza
Department of Electronics & Communication Engineering, Jatiya Kabi Kazi Nazrul Islam University, Trishal Mymensingh, Bangladedsh

Subrata Das
Department of Applied Physics, Electronics & Communication Engineering, University of Dhaka, Bangladesh

Zahid Hasan Mahmood
Department of Applied Physics, Electronics & Communication Engineering, University of Dhaka, Bangladesh

Abstract/ Executive Summary:

In this paper the performance of a PV driven water pump, without battery storage, for supplemental irrigation by harvesting rainwater is analyzed. A brushless DC motor is used in this work. The worst day, in terms of rainfall, of the month of July has been chosen for data collection. The variation of the flow rate as a function of the PV array power is found to be linear. Head loss is calculated and found greater at higher flow rate. Lower trend of the subsystem efficiency is observed with the increment of the array power. Considering the module efficiency of the manufacturer, the system efficiency is also calculated and found 3.2% as the highest. The amount of water lifted is found to be quite satisfactory for supplemental irrigation.

Keywords: PV driven water pump, Without battery storage, Supplemental irrigation, Harvesting rainwater

Location: Ginarpur of Gomastapur thana within the district of Chapainawabgonj

Start Date:

End Date:

Program Area: Farm Mechanization

Commodity: Pump

Objectives:

The performance of a PV driven water pump, without battery storage, for supplemental irrigation by harvesting rainwater

Methodology:

The pump, used for this research, is located at Ginarpur of Gomastapur thana within the district of Chapainawabgonj. Gomastapur is situated at 24°47'N of latitude and 88°16'E of longitude. The clay surface of the Barind Tract is composed of around 30 m of fine-grain deposits, however it also contains fine silt and clay with less abundant sand. This clay, sands, gravels and aquifers are the groundwater source in this studied area. Sediments in the top 26 m of the profile have 5 000-year-old radiocarbon dates. The surface is thought to be the top erosion surface of the Barind clay and underlying sediments are therefore considered much older Barind sediments. The geological properties in the Barind Tract have multiple problems related to water-holding capacity and recurring droughts. The location is a severe drought prone area. Almost 60% of the area is under very severe drought and rest of the area is treated as severe drought prone area. During drought period ‘Aman’ crop suffers from high-yield reduction up to 90%. As a result most of the farmers do not practice supplemental irrigation as it requires substantial investment. They have to depend on rainfall. If there is not enough rain then the plantation is delayed. Delayed transplanting of aman rice reduces the yield and leaves no land to grow short-duration vegetables, oil seeds (mustard) and pulses (chickpea) before boro rice cultivation. In this situation a low cost way for supplemental irrigation can radically increase the production by more than 50%.

Submersible motor-pump unit The system consists of a Mono Pump Sun-Sub System containing a high efficiency, brushless, sensor less, permanent magnet, and DC submersible motor designed for coupling to the Mono Pump’s Sub rotor. The motor has a sealed, permanent magnet rotor and supported by rolling element bearings with all the drive electronics housed separately on the surface in the SMC. The high operating efficiency of the motor pump and SMC ensures that the maximum amount of water can be pumped over the whole day and during cloudy conditions. IV. Performance Analysis The performance of the system has been analyzed for a worst day situation. The worst day is defined as a cloudy day with no rain. This is the day with a high demand of water but with the lowest irradiation. Data has been taken from 7:38 a.m., when the pump starts, to 5:13 p.m., when it stops.

Source of Information: Dhaka Univ. J. Sci. 60(1): 37-41, 2012 (January)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This pump is used only for irrigation for only 4 to 5 months. But rest of the time it is useless though the PV module is continuously giving electricity. If this electricity can be utilized then its use will be optimized. It can be used to provide electricity at night by adding a storage battery.

Knowledge Management: Journal