Modelling and Investigation of Optimum Flow Rate of a Photovoltaic Thermal System (PVT) Integrated with Phase Change Materials (PCM)

2021 ◽  
Author(s):  
Canan Kandilli ◽  
Burak Mertoglu
Keyword(s):  
Phase Change ◽  
Flow Rate ◽  
Phase Change Materials ◽  
Thermal System ◽  
Optimum Flow Rate ◽  
Photovoltaic Thermal System ◽  
Optimum Flow

scholarly journals Improving the Hybrid Photovoltaic/Thermal System Performance Using Water-Cooling Technique and Zn-H2O Nanofluid

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Hashim A. Hussein ◽  
Ali H. Numan ◽  
Ruaa A. Abdulrahman
Keyword(s):  
Flow Rate ◽  
Rear Surface ◽  
Weather Conditions ◽  
Energy Output ◽  
Thermal System ◽  
Water Cooling ◽  
Electrical Efficiency ◽  
Optimum Flow Rate ◽  
Photovoltaic Thermal System ◽  
Cooling Technique

This paper presented the improvement of the performance of the photovoltaic panels under Iraqi weather conditions. The biggest problem is the heat stored inside the PV cells during operation in summer season. A new design of an active cooling technique which consists of a small heat exchanger and water circulating pipes placed at the PV rear surface is implemented. Nanofluids (Zn-H2O) with five concentration ratios (0.1, 0.2, 0.3, 0.4, and 0.5%) are prepared and optimized. The experimental results showed that the increase in output power is achieved. It was found that, without any cooling, the measuring of the PV temperature was 76°C in 12 June 2016; therefore, the conversion efficiency does not exceed more than 5.5%. The photovoltaic/thermal system was operated under active water cooling technique. The temperature dropped from 76 to 70°C. This led to increase in the electrical efficiency of 6.5% at an optimum flow rate of 2 L/min, and the thermal efficiency was 60%. While using a nanofluid (Zn-H2O) optimum concentration ratio of 0.3% and a flow rate of 2 L/min, the temperature dropped more significantly to 58°C. This led to the increase in the electrical efficiency of 7.8%. The current innovative technique approved that the heat extracted from the PV cells contributed to the increase of the overall energy output.

Comparative study on thermal performance of an air based photovoltaic/thermal system integrated with different phase change materials

Solar Energy ◽  
2020 ◽  
Vol 208 ◽  
pp. 1078-1090
Author(s):  
Mohammad Hossein Jahangir ◽  
Seyed Mohammad Emami Razavi ◽  
Alibakhsh Kasaeian ◽  
Hamid Sarrafha
Keyword(s):  
Comparative Study ◽  
Phase Change ◽  
Thermal Performance ◽  
Phase Change Materials ◽  
Thermal System ◽  
Photovoltaic Thermal System

scholarly journals Head lettuce production and nutrition in relation to nutrient solution flow

2020 ◽  
Vol 38 (1) ◽  
pp. 21-26
Author(s):  
Cleiton Dalastra ◽  
Marcelo CM Teixeira Filho ◽  
Marcelo R da Silva ◽  
Thiago AR Nogueira ◽  
Guilherme Carlos Fernandes
Keyword(s):  
Nutrient Solution ◽  
Flow Rate ◽  
Nutrient Accumulation ◽  
Solution Flow ◽  
Flow Rates ◽  
Hydroponic System ◽  
Optimum Flow Rate ◽  
Technical Performance ◽  
Use Efficiency ◽  
Optimum Flow

ABSTRACT The optimum flow rate of nutrient solution in hydroponic system can better nourish the crops, allowing healthy and faster growth of lettuce. However, flow also interferes with electric power consumption, so further researches are necessary, mainly on the effect of flow rate, nutrient accumulation and lettuce production. In this context, the aim of this study was to evaluate nutrition and production of head lettuce in relation to the nutrient solution flow in NFT hydroponic system. The treatments consisted of nutrient solution application at the flow rates 0.5; 1; 2, and 4 liters per minute in each cultivation channel. Five replicates per treatment consisted of 15 plants each. The flow in hydroponic systems to produce head lettuce alters the technical performance of the crop. Due to the greater nutrient accumulation in shoot and use efficiency of these elements, the highest production (g/plant) of head lettuce was obtained with a flow rate of 1 L/min of the nutrient solution.

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