Effect of Un-Balanced Water Supply and Nonuniform Pressure Distribution on the Performance of an Adsorption Cooling System

2019 ◽  
Vol 27 (02) ◽  
pp. 1950014
Author(s):  
Ngoc Vi Cao ◽  
Xuan Quang Duong ◽  
Woo Su Lee ◽  
Jae Dong Chung
Keyword(s):  
Water Supply ◽  
Pressure Distribution ◽  
Cooling System ◽  
Three Dimensional ◽  
Cooling Water ◽  
Finned Tube ◽  
Adsorption Chiller ◽  
Heating Water ◽  
Tube Type ◽  
Adsorption Cooling System

A three-dimensional numerical analysis was conducted to examine the effect on performance of un-balanced heating/cooling water supply and nonuniform pressure distribution in the beds, issues observed in an experiment by our colleague during the development of a 35[Formula: see text]kW prototype finned-tube type adsorption chiller. Case studies were conducted with reference values of [Formula: see text][Formula: see text]m/s, [Formula: see text][Formula: see text]Pa and [Formula: see text][Formula: see text]Pa, and the differences in [Formula: see text][Formula: see text]m/s, [Formula: see text][Formula: see text]Pa and [Formula: see text][Formula: see text]Pa. A remarkable increase in COP was found for the cases of un-balanced heating water supply and nonuniform pressure distribution when the bed was connected to the evaporator. However, after integration of multi-modules, the effect was smoothed out, which removed the worry about the degradation in the overall COP. The effect of un-balanced cooling water supply and nonuniform pressure distribution when the bed was connected to the condenser was not discernible. In all cases, the change in SCP was negligible.

Heat Recovery Time of Adsorption Cooling System

2018 ◽  
Vol 26 (02) ◽  
pp. 1850014 ◽  
Author(s):  
Xuan Quang Duong ◽  
Ngoc Vi Cao ◽  
Jae Dong Chung
Keyword(s):  
Recovery Time ◽  
Heat Recovery ◽  
Cooling System ◽  
Recovery Process ◽  
Finned Tube ◽  
Hot Water ◽  
Two Dimensional ◽  
Cycle Times ◽  
Tube Type ◽  
Adsorption Cooling System

In this study, a two-dimensional numerical model of finned-tube type adsorbers was developed and used to examine heat recovery time to improve the performance of an adsorption cooling system. The optimal heat recovery time, which resulted in the highest COP, was determined for a range of heat source temperatures (60–90[Formula: see text]C) and cycle times (600–1200[Formula: see text]s). The introduced heat recovery process enhanced COP, but also reduced SCP. This penalty became more serious when the hot water temperature was low and cycle time was short, which serves as a guideline for when heat recovery should be adopted in a given operating condition.

Simulation and performance study of a two-bed adsorption cooling system operated with activated carbon-ethanol

2021 ◽  
pp. 095440622110420
Author(s):  
V Baiju ◽  
A Asif Sha ◽  
NK Mohammed Sajid ◽  
K Muhammedali Shafeeque
Keyword(s):  
Water Temperature ◽  
Performance Optimization ◽  
Cooling System ◽  
Cooling Water ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Cooling Power ◽  
Performance Study ◽  
Evaporator Temperature ◽  
Adsorption Cooling System

This paper presents the transient model of a two-bed adsorption cooling system performed in the SIMULINK platform. The inlet chilled water temperature in the evaporator, temperature of cooling water and hot water temperature of the adsorbent bed and its effect on systems coefficient of performance, refrigeration effect and specific cooling power have been studied and presented. It is observed that the systems coefficient of performance is 0.57 when the inlet hot water temperature about 80 °C. In this study, the optimum cooling power and systems coefficient of performance are also determined in terms of the phase time, shifting duration and hot water inflow temperature. The results indicates that the cooling water and hot water inlet temperatures significantly affects the coefficient of performance, specific cooling power and cooling power of the system. The effect of mass flow rate on the cooler efficiency is also presented. A two bed adsorption system of capacity 13.5 kW having an evaporator and condenser temperatures of 6°C and 28°C, respectively, are considered for the present investigation. The adsorbent mass considered is 45 kg with a shifting duration of 20 sec. The result of this study gives the basis for performance optimization of a practical continuous operating vapour adsorption cooler.

Three-Dimensional Study of Heat and Mass Transfer in a Partially Porous Elongated Cavity

2010 ◽  
Vol 297-301 ◽  
pp. 728-732
Author(s):  
N. Mimouni ◽  
Salahs Chikh ◽  
Rachid Bennacer
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Cooling System ◽  
Mass Transfer Rate ◽  
Vertical Wall ◽  
Three Dimensional ◽  
Simple Algorithm ◽  
Geometrical Parameters ◽  
Computational Domain ◽  
Adsorption Cooling System

A 3D numerical analysis is carried out to investigate heat and mass transfer in a partly porous cavity of high aspect ratio. The goal is to determine the best physical and geometrical parameters that allow optimal heat and mass transfer rate in such domain used in a solar adsorption cooling system. The computational domain consists of a tall cavity heated on the left vertical wall and cooled on the opposing wall. The SIMPLE algorithm is used to handle the velocity pressure coupling. Simulation results allow determining the optimal configuration of the used porous substrate and plain fluid position in the cavity in order to optimize the performance of such solar adsorption cooling installation.

Numerical Simulation Analysis on the Flow Mechanism of Passive Containment Cooling System

2013 ◽  
Author(s):  
Yang Song ◽  
Wei-Hua Li ◽  
Sheng-Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Stokes Equations ◽  
Simulation Analysis ◽  
Cooling System ◽  
Early Stage ◽  
Three Dimensional ◽  
Cooling Water ◽  
Navier Stokes ◽  
Flow Mechanism ◽  
Three Dimensional Model

In the third generation PWR, passive containment cooling system was one of the key security parts. If accident happened, the blasting valves in the containment would automatically open and the steam would be injected into the containment. When the pressure reached a certain value, the tank on the top of containment would automatically spray. Driven by gravity, the cooling water would flow along outer surface of containment. Steam inside the containment would condense on inner wall and the pressure in the containment would decrease. A numerical simulation of steam jet in the passive containment cooling system was carried out using computational fluid dynamics methods. Flow mechanism in the process was studied. A simplified three-dimensional model of the passive containment cooling system was built. The hexahedral structured mesh was made. The RNG k-epsilon turbulence model was used in solving the transient Reynolds Navier-Stokes equations by the Fluent. The distributions of velocity in containment at different time were acquired. Reference would be provided for understanding of flow mechanism of gas jet-flow in containment during the early stage of accident.

Study of Waste Heat Driven Adsorption Cooling System Employing Doped MiL-101(Cr) and Water as Adsorbent Adsorbate Pair

2015 ◽  
Author(s):  
Anutosh Chakraborty ◽  
Syed Muztuza Ali ◽  
How Wei Benjamin Teo
Keyword(s):  
Silica Gel ◽  
Waste Heat ◽  
Cooling System ◽  
Water System ◽  
Cooling Capacity ◽  
Isotherm Models ◽  
Oh Groups ◽  
Adsorption Chiller ◽  
Adsorption Isotherm Models ◽  
Adsorption Cooling System

This article presents the dynamic behaviors of two bed adsorption chiller utilizing the composite adsorbent “immobilization of NH2, -NO2, -OH groups to MiL-101(Cr)” as adsorbent and water as adsorbate, which is based on the experimentally confirmed adsorption isotherms and kinetics data. The experimentally measured MOFs + water based isotherms and kinetics data are fitted with adsorption isotherm models and linear driving force kinetics equations. Compared with the experimental data of conventional adsorption chiller based on zeolites/silica gel-water system, we found that the newly working pair provides better cooling capacity and performances in terms of COP and adsorption bed size. From numerical simulation, it is also found that the cooling capacity can be increased up to 20 percent of the parent silica gel-water adsorption chiller and the COP can be improved up to 25% more at optimum conditions.

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.

Optimum fin spacing of finned tube adsorber bed heat exchangers in an exhaust gas-driven adsorption cooling system

2018 ◽  
Vol 232 ◽  
pp. 504-516 ◽  
Author(s):  
Behzad Golparvar ◽  
Hamid Niazmand ◽  
Amir Sharafian ◽  
Amirjavad Ahmadian Hosseini
Keyword(s):  
Heat Exchangers ◽  
Cooling System ◽  
Finned Tube ◽  
Exhaust Gas ◽  
Adsorption Cooling System ◽  
Fin Spacing ◽  
Adsorber Bed
Sign in / Sign up

Export Citation Format

Share Document