EXPERIMENTAL STUDY ON A THREE-BED ADSORPTION CHILLER

2011 ◽  
Vol 19 (04) ◽  
pp. 285-290 ◽  
Author(s):  
M. Z. I. KHAN ◽  
S. SULTANA ◽  
B. B. SAHA ◽  
A. AKISAWA
Keyword(s):  
Heat Source ◽  
Recovery Process ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Inlet Temperature ◽  
Adsorption Chiller ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
Recovery Scheme ◽  
Mass Recovery

This article presents the experimental results of a three-bed advanced adsorption chiller using silica gel–water as the adsorbent–refrigerant pair. The three-bed adsorption chiller comprises three sorption elements (Hexs), one evaporator and one condenser. In the present study, the heat source temperature varies from 55°C to 80°C along with coolant inlet temperature at 30°C and the chilled water inlet temperature at 14°C. Mass recovery process occurs between Hex1 and Hex2 and no mass recovery with Hex3. The performances in terms of cooling capacity (CC) and coefficient of performance (COP) are compared with those of conventional three-bed without mass recovery scheme. Results show that three-bed with mass recovery scheme provides more CC values than those provided by the three-bed system without mass recovery scheme while it provides better COP values for 65–75°C heat source temperature.

Study of the Effects of Mass and Heat Recovery on the Performances of Activated Carbon/Ammonia Adsorption Refrigeration Cycles

2002 ◽  
Vol 124 (3) ◽  
pp. 283-290 ◽  
Author(s):  
T. F. Qu ◽  
W. Wang ◽  
R. Z. Wang
Keyword(s):  
Activated Carbon ◽  
Working Conditions ◽  
Heat Recovery ◽  
Recovery Process ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Adsorption Refrigeration ◽  
Ammonia Adsorption ◽  
Mass Recovery

Mass recovery can play an important role to better the performance of adsorption refrigeration cycles. Cooling capacity can be significantly increased with mass recovery process. The coefficient of performance (COP) of the activated carbon/ammonia adsorption refrigeration cycle might be increased or decreased with mass recovery process due to different working conditions. The advantage is that its COP is not sensitive to the variation of heat capacity of adsorber metal and condensing and evaporating temperature. The cycle with mass and heat recovery has a relatively high COP.

GS0903 Analysis of adsorption chiller against the change of heat source temperature besed on Simulink modeling

2016 ◽  
Vol 2016.22 (0) ◽  
pp. _GS0903-1_-_GS0903-2_
Author(s):  
Akira TAMOGAMI ◽  
Kenji HIROSE ◽  
Masayuki NAKAYAMA ◽  
Atsushi AKISAWA
Keyword(s):  
Heat Source ◽  
Adsorption Chiller ◽  
Source Temperature ◽  
Heat Source Temperature

Performance Study of Waste Heat Driven Pressurized Adsorption Chiller

2013 ◽  
Vol 315 ◽  
pp. 380-384
Author(s):  
Khairul Habib
Keyword(s):  
Heat Source ◽  
Waste Heat ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Low Grade ◽  
Performance Study ◽  
Adsorption Chiller ◽  
And Performance ◽  
Low Grade Heat ◽  
Adsorption Desorption

This article presents a transient modeling and performance of a waste heat driven pressurized adsorption chiller. This innovative adsorption chiller employs pitch based activated carbon of type Maxsorb III as adsorbent and R507A as refrigerant as adsorbent-refrigerant pair. This chiller utilizes low-grade heat source to power the cycle. A parametric study has been presented where the effects of adsorption/desorption cycle time, switching time and regeneration temperature on the performance are reported in terms of cooling capacity and coefficient of performance (COP). Results indicate that the adsorption chiller is feasible even when low-temperature heat source is available.

scholarly journals Study and Analysis by Numerical Simulation of a Solar Continuous Adsorption Chiller

2015 ◽  
Vol 773-774 ◽  
pp. 605-609
Author(s):  
Rabah Gomri ◽  
Billel Mebarki
Keyword(s):  
Solar Energy ◽  
Cooling System ◽  
Recovery Process ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Solar Collectors ◽  
Adsorption Refrigeration ◽  
Continuous Adsorption ◽  
Adsorption Cooling System ◽  
Mass Recovery

Environment and energy problems over the world have motivated researchers to develop energy systems more sustainable, having as one of the possible alternative the use of solar energy as source for cooling systems. Adsorption refrigeration systems are regarded as environmentally friendly alternatives to conventional vapour compression refrigeration systems, since they can use refrigerants that do not contribute to ozone layer depletion and global warming. In this paper a performance comparison between a solar continuous adsorption cooling system without mass recovery process and solar continuous adsorption cooling system with mass recovery process is carried out. Silica-Gel as adsorbent and water as refrigerant are selected. The results show that the adsorption refrigeration machine driven by solar energy can operate effectively during four months and is able to produce cold continuously along the 24 hours of the day. The importance of the mass recovery is proved in this study by increasing the coefficient of performance and the cooling capacity produced. For the same cooling capacity produced, the required number of solar collectors with mass recovery system is lower than the required number of solar collectors in the case of the refrigeration unit without mass recovery. For the same cooling capacity the system with mass recovery process allowed lower generation temperature.

scholarly journals Analysis of the use of adsorption processes in trigeneration systems

2013 ◽  
Vol 34 (4) ◽  
pp. 35-49 ◽  
Author(s):  
Andrzej Grzebielec ◽  
Artur Rusowicz
Keyword(s):  
Heat Source ◽  
District Heating ◽  
Coefficient Of Performance ◽  
Heating Systems ◽  
Research Results ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
District Heating Systems ◽  
Adsorption Processes

Abstract The trigeneration systems for production of cold use sorption refrigeration machines: absorption and adsorption types. Absorption systems are characterized namely by better cooling coefficient of performance, while the adsorptive systems are characterized by the ability to operate at lower temperatures. The driving heat source temperature can be as low as 60-70 °C. Such temperature of the driving heat source allows to use them in district heating systems. The article focuses on the presentation of the research results on the adsorption devices designed to work in trigeneration systems.

Performance Study of Activated Carbon – Hydrofluoro Olefin Based Adsorption Cooling System

2013 ◽  
Vol 465-466 ◽  
pp. 206-210
Author(s):  
Khairul Habib
Keyword(s):  
Activated Carbon ◽  
Waste Heat ◽  
Cooling System ◽  
Combustion Engine ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Inlet Temperature ◽  
Performance Study ◽  
Adsorption Chiller

In this study, a dynamic behavior of a two bed adsorption chiller has been analyzed using highly porous activated carbon of type Maxsorb III as adsorbent and hydrofluoro olefin [R1234ze (E)] as refrigerant. R1234ze (E) has a low global warming potential (GWP) and zero ozone depletion potential (ODP). A parametric study has been presented where the effects of adsorption/desorption cycle time, cooling water inlet temperature and regeneration temperature on the performance are reported in terms of cooling capacity and coefficient of performance (COP). This chiller can be driven by the waste heat of internal combustion engine and hence it is applicable in automobile air conditioning.

On Thermodynamics of Advanced Adsorption Cooling Devices

2008 ◽  
Author(s):  
Bidyut B. Saha ◽  
Anutosh Chakraborty ◽  
Ibrahim I. El-Sharkawy ◽  
Shigeru Koyama ◽  
Kim Choon Ng ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Distribution Function ◽  
Heat Source ◽  
Boltzmann Distribution ◽  
Measured Data ◽  
Cooling Device ◽  
Adsorption Chiller ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
Cooling Devices

This article presents a thermodynamic framework for the estimation of the minimum driving heat source temperature of an advanced adsorption cooling device from the rigor of Boltzmann distribution function and the condensation approximation of adsorptive molecules on adsorbent porous surface. The calculated resuls are validated with our own experimentally measured data. From this thermodynamic analysis, an interesting and useful finding has been established that it is possible to develop an adsorption cooling device that operates with a driving heat source temperature as low as 40 °C along with a coolant of temperature 30 °C. We have also presented here the thermodynamic modeling and experimental investigation of an advanced adsorption chiller for understanding its working principles.

scholarly journals The Effect of Thermal Conductance of Evaporator on Performance of a Two Stage Adsorption Chiller (Reheat) with Different Mass Allocation

2015 ◽  
Vol 62 (2) ◽  
pp. 133-139
Author(s):  
T Sultana ◽  
MZI Khan
Keyword(s):  
Heat Source ◽  
Waste Heat ◽  
Thermal Conductance ◽  
Cycle Performance ◽  
Distinct Advantage ◽  
Two Stage ◽  
Adsorption Chiller ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
Mass Allocation

Now a days, adsorption heat pumps receive considerable attention as they are energy savers and environmentally benign. Silica gel/water based adsorption cycles have a distinct advantage in their ability to be driven by heat of near-ambient temperature so that waste heat below 100 °C can be recovered. One interesting feature of refrigeration cycles driven by waste heat is that they do not use primary energy as driving source. In the present paper, an analytic investigation of a two-stage adsorption refrigeration chiller using re-heat with different mass allocation was performed to determine the influence of the thermal conductance of evaporator as well as the heat source temperature on the chiller performance. Result shows that cycle performance is strongly influenced by large thermal conductance values of the evaporator. Besides it is observed that the chilled water outlet has lower value for comparatively higher value of heat source temperature. DOI: http://dx.doi.org/10.3329/dujs.v62i2.21978 Dhaka Univ. J. Sci. 62(2): 133-139, 2014 (July)

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