Citation
Mohd Ariffin, Mohd Ruzaimi
(2024)
Efficiency enhancement of hybrid photovoltaic thermoelectric generator for greenhouse based on temperature distribution.
Doctoral thesis, Universiti Putra Malaysia.
Abstract
Food security is a pressing global issue, prompting the search for sustainable
agricultural solutions. Agricultural greenhouses present a viable option by
providing controlled environments for crop cultivation. This research focuses
on enhancing the efficiency of photovoltaic (PV) systems in greenhouse
applications through the integration of thermoelectric generators (TEG). The
main goal is to convert residual heat from PV panels into additional electricity
using TEGs, thereby optimizing energy utilization. The study tackles critical
challenges in greenhouse energy management, such as high energy
consumption, excessive solar radiation, and the limitations of conventional PV
systems. A hybrid PV-TEG system was developed to capitalize on the
temperature difference between the heated surface of solar panels and a
controlled cooling mechanism where circulating aquaponic water used as a
liquid cooler to enhance power generation. The methodology involved
designing a small-scale PV greenhouse system, analyzing the temperature
distribution across the PV panels, and developing a power logger for real-time
performance monitoring. Feasibility and temperature distribution analyses
were conducted through both experimental setups and simulations to optimize
the positioning and orientation of TEG modules. In a PV-TEG hybrid system,
the temperature distribution significantly affects the performance of both PV
panels and TEG modules. Non-uniform temperature distribution can lead to
uneven heating, creating "hot spots" that reduce the overall efficiency of the
PV panels. Conversely, a uniform temperature distribution helps maintain
consistent performance across the panel, minimizing thermal stress and
enhancing efficiency and lifespan. Similarly, TEG performance is adversely
impacted by non-uniform temperatures, as they generate power based on
temperature differentials; cooler areas on the PV panel can lead to suboptimal
TEG operation, reducing overall system efficiency. Achieving uniform
temperature distribution ensures TEGs are consistently exposed to a reliable
heat source, maximizing energy conversion capabilities. To achieve this in this
study, the PV panels were installed at an optimal tilt angle of 3° facing South,
maximizing solar exposure at average direct normal irradiance of 314.9 W/m2
in Serdang, Malaysia. The hybrid system demonstrated significant energy
efficiency improvements, with a 33% reduction in power loss due to
temperature mismatches across TEG modules. Strategies employed included
selecting the highest performance TEG cell models, implementing controlled
thermal management through liquid cooling systems, optimizing TEG
placement based on temperature analysis, and designing effective heat sinks.
This study also introduces a novel analytical model for PV-TEG integration,
the PV-TEG Integrated Module (PV-TEGIM), aimed at optimizing heat
distribution and passive cooling techniques. The power output of the PV-TEG
hybrid system increased with solar radiation, peaking at 31.05 W at noon. The
total electrical energy output of the hybrid system was 31% greater than that
of a standalone 100 Wp photovoltaic panel. The findings suggest that this
hybrid system can reduce energy consumption in greenhouse applications,
lower greenhouse gas emissions, and provide a sustainable energy solution
for agricultural production. Future work should focus on expanding the system
for larger-scale applications and investigating advanced materials to enhance
performance further.
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Additional Metadata
Item Type: |
Thesis
(Doctoral)
|
Subject: |
Photovoltaic power generation |
Subject: |
Thermoelectric generators |
Subject: |
Greenhouses - Energy conservation |
Call Number: |
ITMA 2024 5 |
Chairman Supervisor: |
Suhaidi bin Shafie, PhD |
Keywords: |
Greenhouse System, PV-TEG Hybrid, Solar Photovoltaic (PV),
Thermoelectric (TE), Thermoelectric Generator (TEG) |
Depositing User: |
Ms. Rohana Alias
|
Date Deposited: |
04 Aug 2025 07:54 |
Last Modified: |
04 Aug 2025 07:54 |
URI: |
http://psasir.upm.edu.my/id/eprint/118482 |
Statistic Details: |
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