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Hybrid system: Heat pump -solar air dryer for grains ; Sistema hibrido: bomba de calor - calentador solar de aire para el secado de productos agricolas.
Design, building, operation and evaluation energy wise of a hybrid experimental type, with heat pump , that uses no chloride, does not destroy the ozone layer. It is solar air dryer for grains. In this research we dry rice. It has tree systems: 1. The costs is approximately U. The heat pump used 22 refrigerant first, and now works with refrigerant SUVA This refrigerant will be available this year in the I.
En este trabajo secamos arroz. Se compone de tres sistemas: 1. La bomba de calor utiliza refrigerante 22 en una primera generacion, y actualmente opera con un refrigerante SUVA , en una segunda generacion, este refrigerante se comercializara en este ano, en la Union Americana, pertenece a la familia de los llamados refrigerantes ecologicos, sustitutos de los clorofluorocarbonados.
TeGrotenhuis, Ward E. Petersburg, FL United States. Improvements have been identified that will reduce drying times of over 60 minutes to reach the goal of 40 minutes. Nevertheless, the prototype represents a step change in efficiency over heat pump dryers recently introduced to the U. Heat pump dryers theory, design and industrial applications.
Explore the Social, Technological, and Economic Impact of Heat Pump Drying Heat pump drying is a green technology that aligns with current energy, quality, and environmental concerns, and when compared to conventional drying, delivers similar quality at a lower cost.
Heat Pump Dryers : Theory, Design and Industrial Applications details the progression of heat pump drying-from pioneering research and demonstration work to an applied technology-and establishes principles and theories that can aid in the successful design and application of heat pump dryers. Based on the author's personal experience, this book compares heat pump dryers and conventional dryers in terms of performance, quality, removal rate, energy utilization, and the environmental effect of both drying processes.
It includes detailed descriptions and layouts of heat pump dryers , outlines the principles of operation, and explains the equations, diagrams, and procedures used to form the basis for heat pump dryer dimensioning and design.
The author Herbs drying using a heat pump dryer. Fatouh, M. In the present work, a heat pump assisted dryer is designed and constructed to investigate the drying characteristics of various herbs experimentally. Ra is used as a working fluid in the heat pump circuit during the experimental work. Experiments have been conducted on Jew's mallow, spearmint and parsley. The effects of herb size, stem presence, surface load, drying air temperature and air velocity on the drying characteristics of Jew's mallow have been predicted.
A maximum dryer productivity of about 5. It was found that small size herbs without stem need low specific energy consumption and low drying time. Finally, dryer productivity has been correlated in terms of surface load, drying air velocity and drying air temperature. A solar assisted heat- pump dryer and water heater. Growing concern about the depletion of conventional energy resources has provided impetus for considerable research and development in the area of alternative energy sources.
A solar assisted heat pump dryer and water heater found to be one of the solutions while exploring for alternative energy sources. The heat pump system is used for drying and water heating applications with the major share of the energy derived from the sun and the ambient. The solar assisted heat pump dryer and water heater has been designed, fabricated and tested. The performance of the system has been investigated under the meteorological conditions of Singapore.
The system consists of a variable speed reciprocating compressor, evaporator-collector, storage tank, air cooled condenser, auxiliary heater, blower, dryer , dehumidifier, and air collector. The drying medium used is air and the drying chamber is configured to carry out batch drying of good grains. A water tank connected in series with the air cooled condenser delivers hot water for domestic applications. The water tank also ensures complete condensation of the refrigerant vapour.
A simulation program is developed using Fortran language to evaluate the performance of the system and the influence of different variables. A COP value of 7. Maximum collector efficiencies of 0. A value of the SMER of 0. Feasibility analysis of heat pump dryer to dry hawthorn cake. Wang, D. Based on the production process of the hawthorn cake, a HPD is proposed and its basic principle is introduced. The experimental drying curves of the hawthorn cake using the heat pump drying method and the traditional hot air drying method are compared and analyzed.
The drying process of hawthorn cakes is similar to that of the other drying materials. The higher drying temperature causes a faster drying process. But in the initial stage of the heat pump drying process, the water content of the hawthorn cake is not sensitive to the drying temperature, so a lower drying air temperature can be available in order to get a higher coefficient of performance COP of the heat pump HP. The experimental results and the economic analysis indicate that the HPD is feasibly used to dry hawthorn cakes.
Heat- pump tumble dryers ; Waermepumpen-Tumbler. In addition to ecological aspects, this means that a significant reduction in energy costs is achieved as well as a beneficial effect on room climate. Other considerations taken into account in the development of the 6.
Process stability in particular presented a tough challenge. The solution came in the form of an additional booster condenser that prevents overheating of the compressor towards the end of the process when only negligible amounts of energy are being carried away as a result of the low residual moisture in the laundry. It proved possible to reduce the specific power consumption to less than 0. Thanks to the compact, modular design, the heat pump could be integrated in a housing which has the same size as a conventional 6.
Clogging-up of the heat exchanger surfaces with fluff was prevented by a multi-stage cascade filtration system.
With this heat pump dryer it has been possible for the very first time to develop to series production and launch an appliance in the up to 6. Future development opportunities lie in more cost-effective production of the heat pump module, shortening of. The aim of the study was to design and construct a solar grain dryer integrated with a simple biomass burner using locally available materials. This was to address the limitations of the natural sun drying for example drying exposure, liability to pests and rodents, over-dependence on sun and escalated cost of mechanical dryers.
This became beneficial especially in reducing post-harvest losses as well as helping in the preservation of agricultural product. The dryer is composed of solar colle Directory of Open Access Journals Sweden. Full Text Available In Turkey, drying is achieved natural method by spreading out the material on the ground. In this way, there are many disadvantages like low quality and hygienic problems.
The resulting loss of food quality in the dried products may have effect negatively trade potential and economical worth. For preventing the deterioration of the materials different types of drying methods have been developed. Low energy consumption applications are important for drying industry besides high product quality. For this purpose, heat pump dryer is gaining importance day by day in drying applications.
In this study, the working principle of the heat pump dryer , heat pump types in the drying process and the heat pump dryer performance criteria will be considered. An example of application will be described using obtained results from apple drying operation that is conducted in the heat pump dryer. Investigation of the drying airflow at a newly developed dryer geometry for mixed flow grain dryers. Full Text Available The mixed-flow dryer has been a matter of investigation many times regarding drying efficiency, dryer control, and performance enhancement over the past years.
However, there is still considerable demand for optimization in terms of energy efficiency and homogeneity of drying. In order to analyze the specific energy consumption and the homogeneity of the drying process, different thermodynamic process conditions have been investigated for the conventional MFD design using numerical and experimental methods. Based on the results obtained, a novel dryer design has been developed. With this, a considerable increase of efficiency is expected.
As the fluid dynamic analysis of the first design draft revealed, further development is required until scaling-up and transfer into practice will be possible. While homogeneous airflow conditions could be demonstrated in the core flow region in the center of the dryer , the configuration must be optimized in the near wall regions.
Effectiveness of a heat exchanger in a heat pump clothes dryer. This paper deals with study on a heat pump clothes dryer coupled with a heat exchanger. The objective is to explore the effects of the heat exchanger on the performance of the heat pump dryer.
The heat pump dryer consists of a vapor compression cycle and integrated with a drying room with volume 1 m3. The power of compressor is Watt and the refrigerant of the cycle is R The results show the present of the heat exchanger increase the performance of the heat pump dryer. This is because the heat exchanger provides a better drying condition in the drying room with higher temperature and lower relative humidity in comparison with heat pump dryer without heat exchanger.
It is suggested to install a heat exchanger in a heat pump dryer. Review on advanced of solar assisted chemical heat pump dryer for agriculture produce. Over the past three decades there has been nearly exponential growth in drying R and D on a global scale. Improving of the drying operation to save energy, improve product quality as well as reduce environmental effect remained as the main objectives of any development of drying system.
A solar assisted chemical heat pump dryer is a new solar drying system, which have contributed to better cost-effectiveness and better quality dried products as well as saving energy. A solar collector is adapted to provide thermal energy in a reactor so a chemical reaction can take place. This reduces the dependency of the drying technology on fossil energy for heating. In this paper a review on advanced of solar assisted chemical heat pump dryer is presented the system model and the results from experimental studies on the system performance are discussed.
The review of heat pump dryers and solar assisted heat pump dryer is presented.
ISBN 13: 9786054173464