Performance characteristics and energy–exergy analysis of solar-assisted heat pump system (original) (raw)
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Investigation of Performance of Solar-Assisted Heat Pump Systems: Muğla Example
Mugla Journal of Science and Technology, 2018
In this study, the combination of solar thermal systems with heat pump has been investigated numerically. The potential utility of the collectors is found by comparing heat pump systems with combined systems. All simulations for the Muğla province were made using the POLYSUN program. The simulated systems are designed to meet the demand for hot water and residential heating of single-dwelling houses. The results of this study show that the seasonal performance factor of the system increases as the collector field added to the air source heat pump system increases. However, in the systems where the heat demand is met, the heating effect coefficient of the heat pump (COPHP) decreases. In this system, solar energy is used to meet the need for hot water, while also supporting housing heating. However, it has been determined that the heat pump should be selected at a sufficient capacity because the increase in the number of collectors by selecting the heat pump at the insufficient capacity cannot meet the demand. However, it has been determined that the heat pump should be selected at a sufficient capacity because the increase in the number of collectors by selecting the heat pump at the insufficient capacity cannot meet the demand. In the systems where the heat demand cannot be met, the heating effect coefficient after 2 collectors is found to be constant. Collectors used in excess of 2 collectors are closed when there is no need for them. However, it supports heating in winter.
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Solar source heat pump systems present tremendous environmental benefits when compared to the conventional systems for residential applications. In addition to not exhausting natural resources, their main advantage is, in most cases, total absence of almost any air emissions or waste products. In order to investigate the performance of a solar source and energy stored heat-pump system in the province of Erzurum, an experimental setup was constructed, which consisted of twelve flat-plate solar collector, a sensible heat energy storage tank, a water-to-water plate heat exchanger, a liquid-to-liquid vapor compression heat pump, water circulating pumps and other measurement equipments. The experiments were carried out from January to June of 2004 and, the collector efficiency (h c), the heat pump coefficient of performance (COP) and the system performance (COPS) were calculated. In these months performed of the experiments, the outdoor temperature range varies from À10.8 C to 14.6 C. This study shows that the system could be used for residential heating in the province of Erzurum having the coldest climate of Turkey.
Investigation of Solar Assisted Heat Pumps’ Performance in Different Capacity
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Interest in renewable energy sources is growing when economic values such as air pollution, climate change and external dependency on the environment are considered in the process of depletion of fossil fuels. Despite of energy supply security ensuring thanks to availability of renewable energy resources, they can not respond instantly. Therefore they are used together with non-polluting or electricity sources such as electricity. In this study, the number of planar solar collectors was changed between 2 and 10, and the coverage ratio of the solar energy in the heating system, coefficient of the performance and the performance factor of the system were examined via POLYSUN simulation program.
Energy, Exergy and Efficiency Analysis of a Flat Plate Solar Collector used as Air Heater
Sains Malaysiana
Air heating by solar collectors is renewable technology providing hot air for different purposes. The present research emphasizes on analysis of energy, exergy and efficiency of a flat plate solar air heater. The analysis model was tested on five different air mass flow rates of 0.5 (Natural), 1.31, 2.11, 2.72 and 3.03 kgs-1 under three different tilt angles of 25, 35 (Recommended) and 50 o. The data was replicated three times making a total of 45 treatments. A two factorial completely randomized design was used to find if there is any significant difference among the treatments. The results showed that the solar collector gave better performance at air mass flow of 3.03 kgs-1 under tilt of 35 o. At maximum air mass flow rate of 3.03 kgs-1 and optimum tilt angle of 35 o the maximum energetic efficiency of 51%, while minimum exergetic efficiency of 24% and maximum overall efficiency of 71% were recorded. It was concluded that to get maximum thermal efficiencies of 71% from flat plate solar collector used as an air heater must be operated at high air mass flow rates of 3.03 kgs-1 under 35 o tilt angle at Peshawar, Pakistan.
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E3S Web of Conferences, 2021
The heat pumps system is one of the most remarkable system that is widely used around the world, their capacity is different according to necessity. The energy consumption in those systems will limit their effectiveness. This study will try to prove the positive reactance of the new changes (the additional heat exchanger) on the heat pump work, where the power consumption will reduce about (13-17%). The study includes the experimental results of the laboratory model, which has been manufactured in the laboratories of the technical college of Mosul/Northern technical university-Iraq. The model consists of the heat pump that was improved by using the additional heat exchanger, its duty is to heat the refrigerant before entering the compressor, by using solar energy. The results of this work prove the positive effect of the additional heat exchanger, on the coefficient of performance of the heat pump, in both modes of heating and cooling. The conclusions are useful to the industries th...
Experiments on a solar-assisted heat pump and an exergy analysis of the system
Applied Thermal Engineering, 2002
In this work a experimental study of a solar assisted heat pump with direct expansion of the refrigerant within the solar collector, is presented. The maximum exergy efficiency, defined as the ratio of the outlet to the inlet exergy flow in every component of the heat pump cycle, is determined taking into account the typical parameters and performance coefficients. The results of this exergy analysis point out that the main source of irreversibility can be found in the evaporator of the heat pump (that is, the solar collector) emphasizing that incoming solar radiation is not used to full advantage in this piece of equipment. Ó
Solar-assisted heat pump and energy storage for domestic heating in Turkey
Energy Conversion and Management, 1993
In order to improve the performance of the solar-assisted heat pump system with energy storage for domestic heating in the Black Sea region of Turkey, an experimental set-up was constructed. In this study, the solar-assisted series heat pump system with storage and parallel heat pump system with storage are experimentally investigated and compared. This experimental apparatus consists of 30 m 2 of fiat-plate solar collectors, a laboratory with 75 m 2 floor area for heating purposes, a latent heat thermal energy storage tank that is filled by 1500 kg of encapsulated phase-change material (PCM), a heat pump with double evaporators (air-and water-sourced) and one condenser, a water circulating pump and other measuring equipment. The experimental results are obtained in December, January, February, March, April and May in the heating season of 1991 for the two heat pump systems used. The experimentally obtained results are used to calculate the collector efficiency, heat pump coefficient of performance (COP), system COP, storage efficiency and total energy consumption of the system during the heating season.
First and second law analysis of a solar assisted heat pump based heating system
Energy Conversion and Management, 2002
We propose a model for the heating system of an ecological building whose main energy source is solar radiation. The most important component of the heating system is a vapour compression heat pump. Both the first law and the second law were used to analyse the heat pump operation. The state parameters and the process quantities were evaluated by using, as input, the building thermal load. The second law analysis emphasised that most of the exergy losses occur during compression and condensation. Preliminary results show that the photovoltaic array can provide all the energy required to drive the heat pump compressor, if an appropriate electrical energy storage system is provided.