scholarly journals Parametric Studies of a Hybrid Desiccant Cooling System

2012 ◽  
Vol 2 (5) ◽  
pp. 253-258 ◽  
Author(s):  
Pradeep Patanwar ◽  
S.K. Shukla
Keyword(s):  
Cooling System ◽  
Parametric Studies

Thermofluid Design of Energy Efficient and Compact Heat Sinks

2003 ◽  
Author(s):  
Kazuaki Yazawa ◽  
Gary L. Solbrekken ◽  
Avram Bar-Cohen
Keyword(s):  
Heat Sink ◽  
Energy Efficient ◽  
Cooling System ◽  
Heat Sinks ◽  
Air Cooling ◽  
Notebook Computers ◽  
Air Cooling System ◽  
Parametric Studies ◽  
Design Optimum

A compact, energy efficient heat sink design methodology is presented for shrouded, parallel plate fins in laminar flow. The analytic model accounts for the sensible temperature rise of the air flowing between fins, convective heat transfer to the flowing stream, and conduction in the fins. To evaluate the efficiency of the air cooling system, consideration is also given to the determination of the fan pumping power. This paper focuses on the optimization of the heat sink-fan combination for energy efficiency, subject to volumetric constraints. The design optimum is found by matching the most efficient operating point of the fan with the corresponding optimum fin geometry. A series of parametric studies was completed to identify the sensitivity of the cooling solution to parametric variations. This numerically validated model has been used to visualize the parametric impact of dealing with “real world” manufacturing limitation in the development of thermal packaging solutions for notebook computers and other electronic products.

scholarly journals Thermal Performance Combined with Cooling System Parameters Study for a Roller Kiln Based on Energy-Exergy Analysis

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3922 ◽  
Author(s):  
Yali Wang ◽  
Haidong Yang ◽  
Kangkang Xu
Keyword(s):  
Cost Saving ◽  
Residence Time ◽  
Thermal Performance ◽  
Exergy Analysis ◽  
Cooling System ◽  
Air Mass ◽  
Roller Kiln ◽  
Energy And Exergy ◽  
Parametric Studies ◽  
Cooling Air

Roller kilns, characterized as high energy consumption equipment, are widely used in the firing process of ceramic tiles. To evaluate the thermal performance of a roller kiln, a detailed energy and exergy analysis is carried out employing the operating values from a typical ceramic factory. In this study, parametric studies are performed that examine the impacts of the roller kiln’s cooling system on thermal performance, fuel-saving, cost-saving, and environmental influence. The results show that the targeted energy only accounts for 13.4% and 9.7% of the total energy and exergy inputs, indicating the poor efficiency of the roller kiln. This research also identifies that the exergy destruction is the largest cause of the exergy loss in the system, accounting for 85.1% of the total exergy input—of which 50.9% is due to heat and mass transfer, and 37.9% is caused by fuel combustion. Based on the parametric studies, it has been found that with every 1% increase in cooling air mass flow, the energy and the exergy efficiencies of the kiln increase by 0.06% and 0.04%; with every 1% increase in cooling gas temperature, the energy and the exergy efficiencies of the kiln drop by 0.09% and 0.07%; with every 1% increase in cooling gas residence time, the energy and the exergy efficiencies of the kiln increase by 0.16% and 0.12%. Furthermore, results show that the cooling air residence time has the main impact on the cost-saving and carbon dioxide emission reduction, followed by cooling air mass and cooling air temperature.

scholarly journals Applying the scalability apparatus to estimate the thermal efficiency of a single finned tube

2021 ◽  
Vol 2057 (1) ◽  
pp. 012014
Author(s):  
A A Gizzatullina ◽  
O V Mishchenkova ◽  
F N Pushkarev
Keyword(s):  
Cooling System ◽  
Aerodynamic Resistance ◽  
Conjugate Problem ◽  
Finned Tube ◽  
Cooling Process ◽  
System Operation ◽  
Integral Characteristics ◽  
Parametric Studies ◽  
Numerical Coefficient ◽  
Cooling Element

Abstract The paper explores the possibility of scaling the integral parameters of the cooling system operation using the working elements with the length from 0.01 to 0.5 m. Numerical solution of the conjugate problem of external aeromechanics, internal hydrodynamics and heat exchange is carried out. Parametric studies of the cooling process and aerodynamic resistance of finned tubular elements of various lengths are performed. As a result of generalization and unification of the computational experimental data, a numerical coefficient has been obtained to calculate the necessary integral characteristics for a cooling element of the assigned length.

Parametric studies on a metal-hydride cooling system

2009 ◽  
Vol 34 (9) ◽  
pp. 3945-3952 ◽  
Author(s):  
S. Mellouli ◽  
F. Askri ◽  
H. Dhaou ◽  
A. Jemni ◽  
S. Ben Nasrallah
Keyword(s):  
Metal Hydride ◽  
Cooling System ◽  
Parametric Studies

SIMULTANEOUS OPTIMIZATION OF FOUR PARAMETERS IN THE STACK UNIT OF A THERMOACOUSTIC REFRIGERATOR

2014 ◽  
Vol 22 (02) ◽  
pp. 1450011 ◽  
Author(s):  
NOR ATIQAH ZOLPAKAR ◽  
NORMAH MOHD-GHAZALI ◽  
ROBIAH AHMAD
Keyword(s):  
Cooling System ◽  
Acoustic Power ◽  
Optimization Techniques ◽  
Simultaneous Optimization ◽  
Coefficient Of Performance ◽  
Cooling Power ◽  
Multi Objective Genetic Algorithm ◽  
Parametric Studies ◽  
Discrete Values ◽  
Thermoacoustic Refrigerator

Thermoacoustic refrigerators are environmentally friendly cooling systems that use no refrigerants. Optimization of the performance of any cooling system is crucial for an efficient energy management. Most of the optimization techniques in thermoacoustic systems utilized to date involved experimental and numerical parametric studies which are generally limited to the variations of the parameters to be optimized at discrete values. This study reports on the optimization of a thermoacoustic refrigerator using multi-objective genetic algorithm (MOGA). The study introduces the ability of MOGA to optimize four different variables which are length of stack, center position of stack, blockage ratio and drive ratio simultaneously. The four variables are optimized to achieve the two objectives; a maximum cooling and minimum acoustic power required at the stack and provide the optimum coefficient of performance, COP. The results show that the optimum COP = 1.35 with a cooling power of Qc = 6.57 W, acoustic power of Wn = 4.86 W and with the resonator diameter of D = 3.8 cm.

scholarly journals Experimental and Numerical Analysis of a Sustainable Farming Compartment with Evaporative Cooling System

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 823
Author(s):  
M. Sina Mousavi ◽  
Siamak Mirfendereski ◽  
Jae Sung Park ◽  
Jongwan Eun
Keyword(s):  
United Arab Emirates ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Temperature Drop ◽  
Experimental Results ◽  
Optimized Design ◽  
Sustainable Farming ◽  
Humidity Change ◽  
Evaporative Cooling System ◽  
Parametric Studies

The United Arab Emirates (UAE) relies on groundwater as well as desalinated water which are very expensive and energy-concentrated. Despite the lack of water resources, only 54% of wastewater was recycled in the UAE in 2016. In this study, a Sustainable Farming Compartment (SFC) with an evaporative cooling system is investigated as an alternative to reusing wastewater and the optimal design is identified experimentally and numerically. First, the applicability of the SFC was examined to reduce the ambient temperature in the system. A prototype SFC was tested in the environmentally constrained laboratory and field site considering an extreme climate condition (with high temperature and humidity) in Abu Dhabi to evaluate the temperature drop and humidity change of the SFC. The experimental results showed that the temperature of the SFC significantly decreases by 7–15 °C when the initial relative humidity is 50%. For validation, an energy modeling using dynamic numerical simulations was performed that shows statistically good agreement with the experimental results. Based on the parametric studies of the system components, the optimal cooling performance of the system in terms of locations of inlet and outlet, the variation of Reynolds number was evaluated. The study suggested an optimized design for the SFC with an evaporative cooling system.

scholarly journals Parametric Studies on Desiccant Cooling System for Comfort Cooling

2019 ◽  
Vol 7 (3) ◽  
pp. 1259-1263
Author(s):  
Hemant Parmar ◽  
Pranesh Parmar
Keyword(s):  
Cooling System ◽  
Parametric Studies

A High Angle, Double Tilting Cold Stage for the AEI EM7

1974 ◽  
Vol 32 ◽  
pp. 450-451
Author(s):  
P.R. Swann ◽  
A.E. Lloyd
Keyword(s):  
Habit Plane ◽  
Temperature Control ◽  
Tilt Angle ◽  
Cooling System ◽  
Thermal Drift ◽  
High Angle ◽  
Cold Stage ◽  
High Degree ◽  
Better Than

Figure 1 shows the design of a specimen stage used for the in situ observation of phase transformations in the temperature range between ambient and −160°C. The design has the following features a high degree of specimen stability during tilting linear tilt actuation about two orthogonal axes for accurate control of tilt angle read-out high angle tilt range for stereo work and habit plane determination simple, robust construction temperature control of better than ±0.5°C minimum thermal drift and transmission of vibration from the cooling system.

A conduction-cooled stage for high-resolution Cryo-SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1282-1283
Author(s):  
John G. Sheehan
Keyword(s):  
High Resolution ◽  
Liquid Nitrogen ◽  
Mechanical Stability ◽  
Cooling System ◽  
Cold Trap ◽  
Nitrogen Gas ◽  
Particulate Suspensions ◽  
Advantages And Disadvantages ◽  
Convection Cooling ◽  
Styrene Butadiene

The goal is to examine with high resolution cryo-SEM aqueous particulate suspensions used in coatings for printable paper. A metal-coating chamber for cryo-preparation of such suspensions was described previously. Here, a new conduction-cooling system for the stage and cold-trap in an SEM specimen chamber is described. Its advantages and disadvantages are compared to a convection-cooling system made by Hexland (model CT1000A) and its mechanical stability is demonstrated by examining a sample of styrene-butadiene latex.In recent high resolution cryo-SEM, some stages are cooled by conduction, others by convection. In the latter, heat is convected from the specimen stage by cold nitrogen gas from a liquid-nitrogen cooled evaporative heat exchanger. The advantage is the fast cooling: the Hexland CT1000A cools the stage from ambient temperature to 88 K in about 20 min. However it consumes huge amounts of liquid-nitrogen and nitrogen gas: about 1 ℓ/h of liquid-nitrogen and 400 gm/h of nitrogen gas. Its liquid-nitrogen vessel must be re-filled at least every 40 min.

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