Users may download and print one copy of any publication from the public portal for the. Desiccant cooling systems can be operated in a recirculation mode, in ventilation mode, dunkle cycle and wetsurface heat exchanger cycle. A desiccant is a hygroscopic substance that is used to induce or sustain a state of dryness desiccation in its vicinity. A heat exchanger located in the bottom of the drum housing is used for desiccant temperature control. Desiccant wheel absorbs moisture from air due to pressure difference between pressure of. Desiccants for specialized purposes may be in forms other than solid, and may work through other principles, such as chemical bonding of. Publishers pdf, also known as version of record link back to dtu orbit citation apa.
Desiccant, air conditioning, dehumidification, evaporative cooling, thermal energy. Abhinav anand 1001297081 hybrid solar desiccant cooling system by abhinav anand regd. Desiccant cooling systems are basically open cycle systems, using water as refrigerant in direct contact with air. A survey of liquid desiccant cooling systems is presented, along with references to recent work and an assessment of the potential and future research necessary for successful largescale applications. This system has a great potential to provide thermal comfort in places where air humidity is. This property of desiccants is due to its low vapor pressure. These dryers are built and designed to provide the smallest footprint possible while ensuring maximum performance. Desiccant systems allow more fresh air into buildings, thus improving indoor air quality. Use of compound desiccant to develop high performance. However, when the desiccant cooling system must handle the entire load, it overdries the process air so evaporative cooling can be used for the sensible cooling.
All the components of an lds such as dehumidifier, regenerator, packing material and liquid desiccant properties along with its energy storage. Explore hybrid solar desiccant cooling system with free download of seminar report and ppt in pdf and doc format. Dehumidification under lowsensible load and highlatent load conditions. The fact that peak cooling demand in summer is associated with high solar radiation offers an excellent opportunity to exploit solar thermal cooling technologies. Desiccant cooling system an overview sciencedirect topics. Desiccant cooling systems require electricity to operate pumps and fans and heat energy to preheat the desiccant solution for regeneration. The savings gained using the desiccant cooling over conventional systems to achieve the same results were 769 kw per greenhouse. Pdf desiccant cooling systems have been considered as an efficient method of controlling moisture content in supply air. Commonly encountered prepackaged desiccants are solids that absorb water. Keywords desiccant, evaporative cooling, latent heat, ultrasonic, indoor air. Modelling and analysis of a desiccant cooling system using the regenerative indirect evaporative cooling process.
Nvironment energy savings cooling energy energy is recovered from conditioned air that is normally exhausted from buildings. As the desiccant system can operate on low heat, heat energy can be provided through solar thermal systems or any waste heat source from chimneys, power plants, etc. Potential annual energy savings are estimated at 20 to 30 percent, compared to conventional cooling systems. Hybrid desiccant cooling system air conditioning hvac. Department of defense dod uses desiccant cooling technology to. Report liquid desiccant cooling system newest please fill this form, we will try to respond as soon as possible.
An evaporative and desiccant cooling system for an. Desiccant dehumidification and cooling systems assessment. Hybrid desiccant cooling system free download as powerpoint presentation. Pdf application of desiccant in modern air conditioning systems. Ultrasonic regenerative evaporative cooler consists of several sets of a dry. As shown in figure 2, the brinebulb temperature will always be. These systems all use a liquid or solid material called a desiccant to remove water vapor from the air.
Desiccant cooling systems have been used successfully in northern europe and a number of studies have demonstrated that solar energy can be used to. However, if activated alumina is used in a regenerative dryer and the desiccant retaining screens cannot. We use cookies to enhance your experience on our website. Stulz desicair solutions and services brochure revb. An overview of opencycle desiccant cooling systems and. Pressure drop is slightly lower than 18 25mm material. The unique feature of the desiccant wheel is that it can work well under a lower regeneration temperature and have a higher dehumidification capacity due to the contribution of the new compound desiccant materials. By analogy to evaporative cooling, one can define a brinebulb temperature as the temperature that the desiccantair interface approaches. Liquid desiccant dehumidification systems product guide sea level imperial units kds liquid desiccant systems product guide liquid desiccant systems liquid desiccant systems are the most efficient dehumidification system, when cool and dry air is needed and are the perfect solution for a wide range of applications for industrial, commercial, institutional.
The desiccant cooling can be either a perfective supplement to the traditional vapour compression air conditioning technology to attenuate the effects of its drawbacks, or an alternative to it for assuring more accessible, economical, and cleaner air conditioning. An evaporative and desiccant cooling system for air. Desiccant assisted evaporative cooling dec is one such encouraging system, yet research into its use is still at an initial stage and it needs to be investigated further. Due to the gravitation, it trickles through the structure of the dehumidifier where it gets contact with the. Solar thermal cooling can help alleviate the problem. Description download liquid desiccant cooling system newest comments. Solar assisted desiccant cooling system is an attractive and cost effective application for air conditioning system. The addiction of a desiccant dehumidifier to an evaporative cooling air conditioning system provides a humidity control separate of the temperature control. Innovative airs compact series desiccant dehumidifier is perfect for smaller applications where moisture control is critical.
A heat supply is needed in the system to regenerate the desiccant natural zeolite and a lowgrade heat at a temperature of about 60. Pdf solar air conditioning system using desiccant wheel. The brinebulb temperature is a function of a liquid desiccants concentration and the airs temperature and humidity. The main advantage that desiccant cooling systems offer is the capability of using lowgrade thermal energy. Quincy compressor manufactures a full line of desiccant air dryer systems. Design of liquid desiccant dehumidification and cooling. Desiccant cooling systems process water vapor in the earths atmosphere. Desiccant cooling analysis simulation software, energy. It is especially good in applications where the latent thermal load is high comparing to the sensitive load, or when they get the maximum in different time. The potential for solar desiccant cooling in the uk cibse conference 2000 can be viewed and downloaded here as a pdf file.
The paper is aimed to develop a high performance rotary solid desiccant cooling system using a novel compound desiccant wheel dw. Walk in environmental rooms are an ideal application. Submerging this portion of the mesh allows ample time for reconcentration of desiccant on the revolving mesh. Review of liquid desiccant technology for hvac applications. Readdownload file report abuse 3m desiccant product data sheet mouser electronics grade, sulphurfree, nonwoven plastic or economical kraft paper, desiccant helps.
In desiccant cooling cycles, the desiccant reduces the humidity of the air by removing. A liquid desiccant dehumidifier would typically be used in series with a sensible cooling device to reduce the airs drybulb temperature. The chosen cooling cycle incorporates a desiccant wheel and an indirect evaporative cooler, and has been selected with the aspiration of reducing capital cost. Since the second coil is used for sensible cooling only, it will operate dry this can be advantageous in that it reduces the. The objective of this report is to provide a preliminary analysis of the principles, sensitivities, and potential for national energy savings of desiccant cooling and dehumidification systems.
The operation of a desiccant cooling system is based on the use of a rotary dehumidifier desiccant wheel in which air is. Experimental study of an ultrasonic regenerative evaporative cooler. Furthermore, a comparative analysis of desiccant cooling system operat ing on ventilation and. In recirculation mode, also called recirculation cycle, the process inlet air is the return air from the. It consists in water evaporation, through the passage of an air flow, thus decreasing the air temperature. Hybrid solar desiccant cooling system seminar report. If size is not known or specified, the 18 25mm size is usually satisfactory. In this paper, we propose a desiccant cooling system with certain operating. Quincy desiccant dryers have asme and crn designed pressure vessels standard. The focus of research for the past decade has been to develop. Gro w ing use o f ac s is ex pected be caus e of g loba l warm ing. Nalandainstituteoftechnology technical seminar presentation20 presented by.
An evaporative and desiccant cooling system for air conditioning in humid climates evaporative cooling operates using water and air as working fluids. Desiccant cooling simulation software that simulates the operation of the system during a year and performs automatically all the necessary calculations. Compact desiccant dehumidifiers desiccant dehumidifiers. By continuing to use our website, you are agreeing to our use of cookies.
Hybrid desiccant cooling system is used desiccant wheel for dehumidification and then further cool in indirect evaporative cooler, the solar energy is used for desiccant regeneration. Analysis of desiccant cooling system gaurav pundir1 and s n mishra1 corresponding author. Solar assisted desiccant air conditioning system for hot. Desiccant cooling systems for residential and commercial applications are now being used to reduce energyoperating costs. The thermally driven cooling cycle is a combination of evaporative cooling with air dehumidification by a desiccant, i. Desiccant cooling systems are energy efficient and environmentally benign. Analysis of advanced solar hybrid desiccant cooling. Its temperature increases and humidity ratio decreases. Optimisation of a desiccant cooling system design with indirect.
For this purpose, liquid or solid materials can be employed. Desiccant cooling principles the principle of the system is simple warm and humid air passes through the desiccant wheel and is dehumidified by adsorption of water 12. To find effect of dehumidification capacity on the performance of cooling system, four configurations of desiccant cooling system have been investigated. This was put into heat exchangers that cooled the nutrient film.
The scheme thus formed is a desiccant cooling system. In fact, desiccant wheels have been increasingly applied by hvac designers, allowing distinct processes for the air cooling and dehumidification. This document provides an overview of desiccant cooling technology and provides readers with reference materials for more indepth analyses. Article information, pdf download for experimental study of an. Desiccant cooling systems are energy efficient, cost effective, and environmentally safe. Section i deals with the maximum theoretical performance of ideal desiccant cooling systems. A typical recirculation cycle for the desiccant cooling system is shown in figure 21 b. Solar air conditioning system using desiccant wheel technology. Modelling and analysis of a desiccant cooling system. Desiccant cooling system a novel technique for air. Pdf on jan 1, 2009, hossein ghadamian and others published application of. Refrigeration air conditioning pdf free download eugene silberstein. They can be used as standalone systems or with conventional airconditioning to improve the indoor air quality of all types of conditioned spaces. Also explore the seminar topics paper on hybrid solar desiccant cooling system with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile.
Modelling and analysis of a desiccant cooling system using. Combining the ability of the desiccant dehumidifier to handle the latent load and the. The thermal and reversible cops of an open desiccant cooling system depend on operating conditions of the system. In fact, the ability of solid desiccants in moisture removal is effective enough to allow the use of evaporative coolers, in opposition to the traditional vaporcompression cycle, resulting in an. The condensate coming off the latent cooling coil, 600 litres per hour was at a temperature of 11.
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