Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications

Abstract

The high price of purpose-made turbines always represents an active challenge when utilizing pico- and micro-hydropower resources. Pumps as turbines (PATs) are a promising option to solve the problem. However, the selection of a suitable pump for a specific site and estimating its performance in the reverse mode are both major problems in the field. Therefore, this paper aims to develop generic mathematical correlations between the site and the pump hydraulic data, which can be used to select the optimal operation of the pump as a turbine. A statistical model and the Pearson correlation coefficient formula were employed to generate correlations between the flow rate and the head of the pumps with the sites. Then, Ansys CFX, coupled with SST k-ω and standard k-ε turbulence models, was used to analyze the performance of the PAT. The analysis was conducted in terms of flow rate, pressure head, efficiency, and power output. The numerical results were validated using an experimental test rig. The deviations of the proposed correlations from the statistical model were found to be in the range of −0.2% and 1.5% for the flow rate and ±3.3% for the pressure head. The obtained numerical outputs using the standard k-ε turbulence model strongly agreed with the experimental results, with variations of −1.82%, 2.94%, 2.88%, and 1.76% for the flow rate, head, power, and efficiency, respectively. The shear stress transport (SST) k-ω turbulence model showed relatively higher deviations when compared to standard k-ε. From the results, it can be concluded that the developed mathematical correlations significantly contribute to selecting the optimal operation of the pump for power-generating applications. The adopted numerical procedure, selected mesh type, turbulence model, and physics setup provided good agreement with the test result. Among the two turbulence models, the standard k-ε performs better in estimating the pressure head, output power, and efficiency of the PAT with less than 3% errors when compared to experimental results.

Numerical investigation of flow characteristics in the front and rear chambers of centrifugal pump and pump as turbine

“… 1 – 4 . Pump as turbine is a type of liquid residual pressure energy recovery equipment, which is widely used for energy utilization in agricultural irrigation 5 , hydroelectric power generation 6 and urban water supply systems 7 due to its advantages of simple structure, easy maintenance, and low cost. Improving the performance of centrifugal pump and pump as turbine to achieve high efficiency has been the main goal of pump researchers.…”

The pump as a turbine: A review on performance prediction, performance improvement, and economic analysis

“…Additionally, when operating in reverse mode, pumps can be utilized to generate electrical power. PAT technology finds application in various fields, including Pico/micro-hydropower projects [ [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] ], water supply/distribution systems [ [26] , [27] , [28] , [29] ], reverse osmosis systems [ 29 , 30 ], pressure-reducing systems [ 31 , 32 ], and power recovery in irrigation and industrial piping networks [ 33 , 34 ].…”

Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed

“…For a large amount of high residual pressure liquids in industries such as petrochemical, petroleum processing, seawater desalination, and steel metallurgy, pressure-reducing valves or orifice plates are usually used to reduce these fluids to the required low pressure, which means that large pressure energy in fluids is wasted [1][2][3][4][5][6]. To reduce energy waste, some enterprises use hydraulic turbine devices to recycle and utilize pressure energy [7][8][9]. The hydraulic turbine, as an energy recovery device, is used to achieve the goal of energy recovery by converting the pressure energy of the liquid into the rotating mechanical energy of the turbine runner [10][11][12][13][14].…”

“…The hydraulic turbine, as an energy recovery device, is used to achieve the goal of energy recovery by converting the pressure energy of the liquid into the rotating mechanical energy of the turbine runner [10][11][12][13][14]. At present, in the field of high residual pressure fluid recovery, reverse multi-stage pumps are often used as turbines for energy recovery [9,15,16]. However, when reverse pump turbines operate under non-design conditions, their performance decreases significantly, and they even become energy-consuming devices, resulting in secondary energy waste.…”