- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Performance indicators of photovoltaic heat-pumps
摘要： In the last few decades, the demand for reversible heating and cooling systems has increased significantly, together with the need to generate energy in a more efficient and sustainable way. Consequently, the concept of solar photovoltaic (PV) powered heat pumps (HP) has become very attractive in order to match the heating/cooling demand with a renewable and environmentally-friendly energy source. This paper presents a review of the different solutions for PV-HP systems that have been studied theoretically and/or experimentally tested, and of the Key Performance Indicators (KPIs) that were mainly used. An analysis of these traditional KPIs has been performed and their boundaries were identified. As a result, new KPIs (PR25, PRref,25, SPFPV-HP and SPFPV-HP,ref,25) were proposed for trying to mitigate such limitations, as well as for evaluating not only the quality of the HP and the PV system, but also the quality of their integration and the renewable character of the whole PV-HP system. This paper is aimed to be framed in the common effort of the PV-HP research community to reach a set of KPIs that allow comparing the different future works and, therefore, a set of recommendations and future research lines are also proposed.
关键词： Heat-pump,Performance indicator,Photovoltaic,Electrical engineering,Energy engineering,Engineering,Photovoltaic/Thermal,Systems engineering,Industrial engineering
更新于2025-09-19 17:13:59
-
Assessment of the cost reduction potential of a novel loop-heat-pipe solar photovoltaic/thermal system by employing the distributed parameter model
摘要： A novel micro-channel loop-heat-pipe solar photovoltaic/thermal (LHP- PV/T) system is developed employing the co-axial tubular heat exchanger as the condenser and upper-end liquid header with tiny holes as the liquid feeder. The design facilitates an easier connection among the solar modules. It creates the improved condensation and separate evaporation effects within the LHP. A reduced evaporator area will thereby have a minor impact on the overall heat transfer performance, leading to significant potential for cost reduction. A distributed parameter model is established and validated by experimental data. The model is then applied to analyze the cost reduction potential of the LHP- PV/T via the optimization of geometrical and structural parameters. The impact of the area reduction on the LHP evaporator differs from that on the traditional integral heat pipe PV/T. The decrements in thermal and electrical efficiencies of the LHP- PV/T are 2.47% and 0.03% respectively when the width of heat pipes in the evaporator decreases from 26 to 10 mm. When the number of heat pipes decreases from 30 to 6, the decrements in thermal and electrical efficiencies are 4.63% and 0.12%, whilst the overall system cost drops by 28.58%, thus the cost-effectiveness of the system can be improved.
关键词： Co-axial tubular heat exchanger,Photovoltaic/thermal,Cost,Loop-heat-pipe,Micro-channel
更新于2025-09-19 17:13:59
-
Performance assessment of a hybrid photovoltaic-thermal and heat pump system for solar heating and electricity
摘要： This work investigates a solar combined heat and power systems based on hybrid photovoltaic-thermal heat pump systems for the simultaneous provision of space heating and electricity to residential homes. The analysed system connects a photovoltaic-thermal (PVT) panel, through a PVT water tank, to a heat pump. The study is based on quasi-steady state heat transfer and thermodynamic analysis that takes incremental time steps to solve for the fluids temperature changes from the heat pump and the solar PVT panels. The effects of solar irradiance, size of the water tank and the water flow rate in the PVT pipes (laminar and turbulent) on the performance of the system are analysed. Particular focus is made towards the efficiency (electrical and thermal) of the PVT and the COP of the heat pump. Results show that the minimum COP of the heat pump is 4.2, showing the high performance of the proposed hybrid system. Increasing the water flowrate through the PVT panel from 3L/min (laminar) to 17L/min (turbulent) increases the PVT’s total efficiency (electrical + thermal) from 61% to 64.5%. Increasing the size of the PVT water tank from 1L to 100L, increases the total efficiency of the PVT panel by 6.5%.
关键词： quasi-steady state modelling,heat pump,solar photovoltaic-thermal,hybrid system
更新于2025-09-19 17:13:59
-
Performance enhancement of a photovoltaic thermal (PVT) and ground-source heat pump system
摘要： A new system consisting of photovoltaic thermal-ground source heat pump (PV/T-GSHP) was proposed as a solution for electricity shortage and high electricity consumption in heating buildings in Jordan. The performances of the photovoltaic system and the ground source heat pump system were studied without coupling as in real life and with coupling in a hybrid system using TRNSYS software. The results show that this PV/T-GSHP hybrid system can reduce the photovoltaic panels' temperature by more than 20 °C, and improve the e?ciency of electricity production by 9.5 %, simultaneously. And in heating season the average coe?cient of performance of the heat pumps increased from 4.6 to 6.2 with a decreament in electricity consumption by 25.7 %. The life cycle cost of the hybrid system decreased by 3.9 % and the net present value inceased by 13.2 % compared to the two systems separated. The model of the PV/T-GSHP system was established using TRNSYS software, an optimmi-zation was made to select the photovoltaic modules' temperature at which cooling starts, followed by technical and economical studies on both systems separated and coupled in a hybrid system. This hybrid system can provide guidance for future related project.
关键词： Hybrid system,Ground-source heat pump,TRNSYS,Renewable energy,Solar photovoltaic/thermal
更新于2025-09-19 17:13:59
-
Development of a photovoltaic thermal facade system
摘要： A photovoltaic thermal (PVT) collector is made of a photovoltaic (PV) module and a solar thermal collector and thereby delivers electrical and thermal energy at the same time. These systems can contribute significantly to the renewable energy supply of residential, public, and commercial buildings. This paper gives insight into the development of a facade-integrated PVT system within the research project PVT Fassade. Thermal simulations evaluated useful operating conditions and efficiency-decreasing factors. Thus, 10 kg/(hm2) and 60 kg/(hm2) were identified as lower and upper limits for the mass flow and the losses by the internal heat transfer resistance of a 3.5 mm air layer between the PV module and the heat exchanger were determined to 35 % and 48 % for 10 and 60 kg/(hm2). These findings and structural, aesthetical, and general building law requirements were taken into consideration for the design of the facade-integrated PVT system. The functionality and feasibility of the developed system is shown through a constructed prototype facade where an intensive monitoring of the thermal and electrical performance of the PVT system is conducted. The performance of the PVT facade collector is described on the basis of an exemplary day of this monitoring. On this day, an area-specific thermal yield of 4.13 kWh/m2 with a temperature spread of up to 10.7 K is reached. At the same time, the thin film PV modules of the PVT system achieve an electrical yield increase of 2.5 % compared to a reference PV facade system.
关键词： facade-integrated PVT system,electrical yield,thermal simulations,photovoltaic thermal (PVT) collector,renewable energy
更新于2025-09-16 10:30:52
-
AIP Conference Proceedings [AIP Publishing RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Tamil Nadu, India (14–15 March 2019)] RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Performance investigation on various models on solar photovoltaic thermal (PVT) hybrid system
摘要： This research article deals with the first law of thermodynamic analysis on solar photovoltaic thermal hybrid system with three kinds of models namely model 1 (fully transverse obstacles), model 2 (partially transverse obstacles) and model 3 (longitudinal obstacles with baffles) experimentally. It was designed, fabricated and tested at the tropical climatic condition of Chennai. Two different mass flow rates of air (0.0071 kg/s and 0.0085 kg/s) have been used for enhancing the performance of the system. The performance of solar PVT hybrid system relies on solar radiation, physical geometry and mass flow rate of air. All the models were subjected to first law analyses which were compared with respect to local time and other parameters such as glazing temperature, outlet air temperature. The PVT hybrid system experimentally proved to enhance the thermal performances with an increasing air mass flow rate. The obtained experimental results are in good agreement with previous research findings.
关键词： PVT,photovoltaic thermal,model,thermal efficiency,obstacles
更新于2025-09-16 10:30:52
-
Hybrid Photovoltaic and Solar Thermal Systems (PVT): Performance Simulation and Experimental Validation
摘要： Continuous Solar irradiation on the photovoltaic panel causes its temperature to increase, resulting in reduced efficiency. The present paper focuses on improving the efficiency of the photovoltaic panel through the use of hybrid Photovoltaic-Thermal (PVT) system. Water is used as the coolant in the cooling channel, flowing through the copper tubing provided below the photovoltaic panel, where the temperature is maximum. The thermal energy extracted in the process can be harnessed in several ways, improving the overall efficiency of the system. A theoretical model was prepared using COMSOL? multi-physics. The results achieved in the experimental set-up are quantified. As per the experimentation carried on the photovoltaic panel, an average temperature of 303.38 K at Standard Test Condition (STC) was achieved through cooling, while the temperature of the panel without cooling rose up to 333.15 K in environmental conditions, thus, improving the efficiency of the photovoltaic panel. The paper later applies the idea to an entire solar power plant to improve the overall efficiency of the power plant, by cooling the photovoltaic panel as well as generate hot water as its by-product.
关键词： Hybrid photovoltaic-thermal (PVT) systems,Hybrid model,Photovoltaic panel
更新于2025-09-16 10:30:52
-
Performance study of a dual-fluid photovoltaic thermal collector with reflection and refraction solar concentrators
摘要： The temperature of a photovoltaic (PV) plate increases with increasing absorbed irradiation, leading to degradation of the electrical efficiency of the PV cells. The heat can be dissipated by air or water to prevent the deterioration of the cells. In this study, a concentrating photovoltaic thermal (PV-T) dual-fluid solar collector is proposed in which two types of concentrators are integrated. The collector’s performance was analysed with air and water as the working fluids. Analytical expressions were derived from the energy balance equations for each component of the collector. The mean temperature values of the PV plate, air inlet/outlet, water inlet/outlet, glaze and collector back wall were experimentally recorded under different fluid mass flow rates and solar irradiations. The readings were then used to compute the thermal and electrical efficiencies of the collector. The results obtained from the numerical and experimental analyses were compared and evaluated by employing the mean absolute percentage error method. The results show that incorporating two fluids increases the thermal and electrical efficiencies. The total thermal and electrical efficiencies achieved are 67.00% and 13.02%, respectively, at air and water mass flow rates of 0.0103 kg/s and 0.0164 kg/s, respectively, and a solar irradiation of 650 Wm?2. The outcomes of this research are expected to help advance the designs of dual-fluid PV-T solar collectors and offering a broader range of thermal applications.
关键词： reflection,photovoltaic,thermal,dual fluid,refraction,solar,collector,energy balance
更新于2025-09-16 10:30:52
-
Numerical simulation and experimental validation of a photovoltaic/thermal system based on a roll-bond aluminum collector
摘要： In this paper, the performance of a polycrystalline silicon photovoltaic module and photovoltaic/thermal module are experimentally investigated under outdoor conditions, using a roll-bond thermal collector attached on the backside of the photovoltaic module. Furthermore, the temperature, pressure and velocity distributions across the photovoltaic/thermal module are simulated using a steady state thermal model. Compared with the photovoltaic module, the performances of photovoltaic/thermal module with and without the coolant circulation are both examined using a water volume of 100 L and a coolant mass ?ow rate of 0.034 kg/s. Using a design with a timed supplement water strategy, the electrical energy produced by the photovoltaic/thermal system has been increased by 3.25%. Compared without supplement before, the electrical energy can be extra increased more than 1%. A good agreement is found between simulated and experimental results. There is no doubt that the output performance of the photovoltaic/thermal system can be improved effectively by the design of timed supplement water.
关键词： Performance,Roll-bond design,Aluminum collector,Supplemental water strategy,Photovoltaic/thermal system
更新于2025-09-16 10:30:52
-
Effect of dust deposition on performance characteristics of a refrigerant based photovoltaic/thermal system
摘要： A photovoltaic/thermal (PV/T) system is an integration of a solar thermal system and photovoltaic module, which produces both heat and electricity simultaneously with better performance characteristics. Depending on the heat transfer fluid employed, they are mainly classified as air, water or refrigerant based systems. Advances in the field of PV/T systems ascertained that refrigerant based PV/T systems have better reliability and superior performance compared to air or water based PV/T systems. To date, the effect of dust deposition on the performance of a refrigerant-based photovoltaic/thermal system is hardly reported. The objective of the present study is to analyze the effect of dust deposition on the performance characteristics of a refrigerant photovoltaic/thermal system. Firstly the dust deposition under the climatic conditions of Surat City (21.17° N, 72.83° E), India was characterized through an experimental procedure following which a validated numerical model was used to study its effect on performance. It was observed that the progressive dust accumulation for a period of eight weeks reduced the spectral transmissivity of the glass from 91% to 46.09% due to which the electrical efficiency and coefficient of performance (COP) of the system reduced relatively by 44.14% and 8.53% respectively.
关键词： Dust deposition,Photovoltaic/thermal system,Heat pump
更新于2025-09-16 10:30:52