project maker
08-08-2014, 12:09 PM
Development of Novel Solar Adsorption Cooling Tube
[attachment=66740]
Abstract
This paper presents the development of a novel solar-powered adsorption cooling tube. The tube consists of adsorbent
bed (solar collector), condenser, and evaporator, all in one unit.. Activated Carbon-Methanol is used as a working
pair to suit cooling and refrigeration applications. From the experimental studies of the tube results all year round,
performance and produced cooling are evaluated as well as recommendations and conclusions for best performance
are presented
1. Introduction
In recent years researches show that adsorption systems are most promising technologies to produce
cooling due to their simple designs and operations. The adsorption solar system in its simplest form is a
closed system composed of the container of adsorbents and adsorbate (sorption bed), which serves as a
solar collector, a condenser and an evaporator. The cycle of this system is divided into two periods: First,
the adsorbent is heated by solar energy during the day and the desorbed adsorbate is condensed. Then the
adsorbent is cooled after sunset, thereby re-adsorbing the adsorbate, the evaporation of which produces
the cooling effect. Different pairs depending on the purpose of the cooling system are used. Activated
carbon methanol is one of working pairs most commonly used in adsorption. The COP (coefficient of
performance) is the largest when activated carbon pairs with methanol [1].
Although, the alternation of heating and cooling during the cycle perfectly suits the intermittent nature of
solar energy, yet efficient operation of the system requires high rates of heat transfer besides mass transfer
in and out of the adsorption system. Widespread application of adsorption system not only suffer from
poor heat and mass transfer performance but also from low operating reliability because high vacuum
must be maintained in the adsorption cooling system, In addition, all solar systems usually suffer from the
large variations in ambient conditions between winter and summer, which makes these systems inefficient
for part of the year. In the last two decades, several studies propose different developed systems which
allow a good compromise between, high reliability, and good performance. From those studies, simple
. Experimental Work
The experimental work has been carried on two steps:
1-Design and indoor tests of the adsorption cooling tube to optimize its operating design parameters
2-Design and out door tests of multi solar tubes system under actual climatic conditions of Cairo, Egypt
(30 o
latitude) to determine and evaluate its performance all year round
Conclusions
A novel solar adsorption tube is designed, constructed and tested all year round under actual climatic
conditions of Cairo, Egypt (30 operformance. Test results show that the tube performance in sunny days of winter is efficient as well as
summer days, (7kg /m2
ice is formed). In cloudy winter days about 4 kg/m2
of ice is formed. Cooling of
more than 7 kg/m2
of water causes cooling the water to 10 o
C for 50 kg/m2
in summer which may widen
the applications of the tube to be used as a water cooler or in air conditioning systems.
C latitude). Some design improvements are introduced to improve its
[attachment=66740]
Abstract
This paper presents the development of a novel solar-powered adsorption cooling tube. The tube consists of adsorbent
bed (solar collector), condenser, and evaporator, all in one unit.. Activated Carbon-Methanol is used as a working
pair to suit cooling and refrigeration applications. From the experimental studies of the tube results all year round,
performance and produced cooling are evaluated as well as recommendations and conclusions for best performance
are presented
1. Introduction
In recent years researches show that adsorption systems are most promising technologies to produce
cooling due to their simple designs and operations. The adsorption solar system in its simplest form is a
closed system composed of the container of adsorbents and adsorbate (sorption bed), which serves as a
solar collector, a condenser and an evaporator. The cycle of this system is divided into two periods: First,
the adsorbent is heated by solar energy during the day and the desorbed adsorbate is condensed. Then the
adsorbent is cooled after sunset, thereby re-adsorbing the adsorbate, the evaporation of which produces
the cooling effect. Different pairs depending on the purpose of the cooling system are used. Activated
carbon methanol is one of working pairs most commonly used in adsorption. The COP (coefficient of
performance) is the largest when activated carbon pairs with methanol [1].
Although, the alternation of heating and cooling during the cycle perfectly suits the intermittent nature of
solar energy, yet efficient operation of the system requires high rates of heat transfer besides mass transfer
in and out of the adsorption system. Widespread application of adsorption system not only suffer from
poor heat and mass transfer performance but also from low operating reliability because high vacuum
must be maintained in the adsorption cooling system, In addition, all solar systems usually suffer from the
large variations in ambient conditions between winter and summer, which makes these systems inefficient
for part of the year. In the last two decades, several studies propose different developed systems which
allow a good compromise between, high reliability, and good performance. From those studies, simple
. Experimental Work
The experimental work has been carried on two steps:
1-Design and indoor tests of the adsorption cooling tube to optimize its operating design parameters
2-Design and out door tests of multi solar tubes system under actual climatic conditions of Cairo, Egypt
(30 o
latitude) to determine and evaluate its performance all year round
Conclusions
A novel solar adsorption tube is designed, constructed and tested all year round under actual climatic
conditions of Cairo, Egypt (30 operformance. Test results show that the tube performance in sunny days of winter is efficient as well as
summer days, (7kg /m2
ice is formed). In cloudy winter days about 4 kg/m2
of ice is formed. Cooling of
more than 7 kg/m2
of water causes cooling the water to 10 o
C for 50 kg/m2
in summer which may widen
the applications of the tube to be used as a water cooler or in air conditioning systems.
C latitude). Some design improvements are introduced to improve its