A Study of the Heat Transfer Coefficient of a Mini Channel Evaporator with R-134a as Refrigerant

Dollera*, Elmer B.; Villanueva, Eliseo P.

doi:10.1088/1757-899x/88/1/012027

Cited by 9 publications

(17 citation statements)

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“…The binary system on the other hand includes the use of two separate evaporator tubes; one where refrigerant flows and the other where water flows. The evaporator coil where refrigerant flows is submerged in liquid and is placed inside a water storage drum to induced a high coefficient of heat transfer [2].…”

Section: Methodsmentioning

confidence: 99%

Central Processing Unit Binary Cooling System using Tetrafluoroethane as Refrigerant

Dollera*,

Golez,

Almedilla

et al. 2019

IJITEE

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Electronic devices and instruments generate heat that can cause serious damage and low efficiency towards its components. The heat that the different electronic elements and components emit can decrease both efficiency and life capacity of the device. And with the increase of use of electronic devices in industries and processes, heat dissipation in electronic devices should be taken into strict consideration. This study aims to develop a cooling system under vapor compression refrigeration system. The prototype fabricated was designed for the cooling system of two Central Processing Units of desktop computer which can be as good equivalent for the electronic devices in industries. Though ventilation was present in the processing units, certain condition such as condition in surroundings can be of great help to improve the device efficiency. This study also aims to analyze the CPU’s efficiency in relation to lowering ventilation temperatures. The vapor compression refrigeration system will be the main device used for lowering and maintaining a suitable temperature inside the CPU casing. The system works like a centralized air-conditioning system wherein the air from the surroundings will be cooled down by the evaporator in the vapor compression refrigeration system. The cooled air will then be delivered to the CPU through the installed air ducting connections. The recording of CPU’s efficiency is provided by the installed software. It also measures the air conditioned parameters and computation of the CPU power consumption. The results from the test and the analysis of the gathered data showed that 165 watts of heat dissipated was removed by the cooling system and the CPU performance index rose up from 424 to 446 with a discharge air temperature of 29.67 oC. Based from the result, the fabricated binary cooling system is efficient enough to increase the performance index of the CPU and absorbing heat dissipated by the device

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Section: Methodsmentioning

confidence: 99%

Central Processing Unit Binary Cooling System using Tetrafluoroethane as Refrigerant

Dollera*,

Golez,

Almedilla

et al. 2019

IJITEE

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“…This covers the dimensions of the case, the size of the storage and the calculation of the heat load of the vaccine carrier kit. The major parts of the vapor compression refrigeration system were also acquired for the assembly of the experimental rig [3]. The necessary materials were prepared, including the fabrication of the experimental rig and the capillary tubes with inserted guitar strings.…”

Section: B Research Process Flowmentioning

confidence: 99%

Choke Point in Mini Expansion Device for the Development of Portable Vaccine Kit

Dollera,

Dablo,

Dollera

et al. 2019

IJEAT

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Vapor compression refrigeration system is substantial to human comfort and needs that contributes to the progress mainly in agriculture, food preservation and in medical application. One of the applications that this study focused on is the study of the choke points in mini expansion device for the development of portable vaccine carrier kit. This study utilized a vapor compression refrigeration system, and aims to improve the system operation of a small-scale vapor compression refrigeration system by using spirally-arranged capillary tubes with five(5) different hydraulic diameters, namely; 0.20mm, 0.25mm, 0.30mm, 0.35mm and 0.40mm. A 1/8 horsepower vapor compression refrigeration system of a water dispenser is used as an experimental rig that supply the required refrigerant flow on the spirally- arranged expansion device. Guitar strings are used to reduce the hydraulic diameter of the commercially available capillary tubes. With the inserted guitar strings, the five(5) different hydraulic diameters in this study would be connected to the experimental rig. The data gathering method is developed by using a data logger and the fabricated spirally-arranged capillary tubes connected to the experimental rig. The determination of its lengths of choke point and the behavior of the pressure drop is measured during the different trials used for every hydraulic diameter of the spirally-arranged capillary tube. The mathematical equation that correlates the hydraulic diameters of the capillary tubes and their corresponding choke points is represented by the equation y = -1,836.0x2 + 2,319.0x-1 - 1.7860, where y is the distance of the capillary tube choke point and x is the hydraulic diameter of the fabricated spirally-arranged capillary tubes. This equation correlates the hydraulic diameter of a capillary tube to its corresponding choke point length with a value of R2 = 0.9947.

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“…In the project testing, the researchers have to monitor the ambient, focal point, and the temperature of the glass in every 30-second interval for a duration of 60 minutes [7]. The researchers also must answer the objectives stated in the previous pages.…”

Section: Data Gathering and Calculationsmentioning

confidence: 99%

“…The parabolic trough reflects some of the energy from the sun, some of the energy is absorbed by the parabolic trough and the rest is absorbed by the bottom portion of the container. With the use of data logger, the temperature of the glass is recorded during the 60 minutes period [8]. By allowing the seawater gain heat in the container, and when it reached a certain temperature, vaporization process then takes place.…”

Section: A Data Gatheringmentioning

confidence: 99%

Water Desalination System using Parabolic Trough with Varying Glass Thickness

Dollera*¹

2019

IJEAT

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Three quarters of the earth’s surface is covered with water[1]. Based on a survey, with the world’s population growing every year, the supply of usable water is not keeping enough with the required amount of water needed for survival. Nowadays, clean water has become a business which produces constraints when it comes to accessibility. Here in the Philippines, there are various diseases every year which relates to unsafe drinking water which may sometimes lead to death. The researchers want to know the effectivity of the assessed solar desalination system, how much desalinated water could this system provide and how long does it take for this amount to be produced in a given day. This study uses a parabolic trough which is the main means of harnessing solar energy and transferring this energy to the saltwater container which will heat up the pre-specified amount of saline water. The vapor will evaporate and the condensate will be trapped in the glass lid and routed to a desalinated water container. An evaluation is made to know the effective glass thickness for the device, the 3mm, 6mm and 10 mm thickness has been assessed and after the testing phase, it has been found out that the 10 mm glass thickness produced the optimum results. It is able to produce a liter of desalinated water out of 5000 mL of saline water. It is then observed that the 10mm glass thickness has the highest volume conversion efficiency of 23.10 % , followed by the 6mm glass thickness of 21.90% and the 3mm glass thickness of 17.30%.

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A Study of the Heat Transfer Coefficient of a Mini Channel Evaporator with R-134a as Refrigerant

Cited by 9 publications

References 0 publications

Central Processing Unit Binary Cooling System using Tetrafluoroethane as Refrigerant

Central Processing Unit Binary Cooling System using Tetrafluoroethane as Refrigerant

Choke Point in Mini Expansion Device for the Development of Portable Vaccine Kit

Water Desalination System using Parabolic Trough with Varying Glass Thickness

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