scholarly journals Design of eco-friendly refrigeration system

2019 ◽  
Vol 3 (2) ◽  
pp. 1-11
Author(s):  
Ricardo Fabricio Muñoz Farfán ◽  
Telly Yarita Macías Zambrano ◽  
Víctor Manuel Delgado Sosa ◽  
Vicente Zambrano
Keyword(s):  
Freezing Temperature ◽  
Food Storage ◽  
Freezing Process ◽  
Mechanical Compression ◽  
Refrigeration System ◽  
Air Conditioning System ◽  
Specific Product ◽  
Technological Transfer ◽  
Installed Capacity ◽  
Temperature Interactions

The present study of a freezing system has developed based on an air conditioning system, whose purpose is to take advantage of the technological transfer of cold producing equipment for food storage and conservation uses. The installed capacity of 9000 BTU/Hr was considered for the choice of equipment. We studied the freezing process of fish, water, and the preservation of legumes with a volume of 1 kg per product individually. The freezing temperature has evaluated with a mechanical compression refrigeration system of Gas R22 with temperature interactions of 29.6 ° C to -12 ° C. and monitored with a Proportional Integrative Derivative (PID) controller. For production cost, the equipment was mostly made of its parts and pieces with recycling material. A descriptive experimental design has carried out, for the verification of results. The equipment managed to reach chamber temperatures of -13 ° C from 20 minutes once the equipment (compressor) has turned on under specific product descriptions.

scholarly journals Effects of Isochoric Freezing Conditions on Cut Potato Quality

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 974
Author(s):  
Yuanheng Zhao ◽  
Cristina Bilbao-Sainz ◽  
Delilah Wood ◽  
Bor-Sen Chiou ◽  
Matthew J. Powell-Palm ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Freezing Point ◽  
Freezing Temperature ◽  
Quality Attributes ◽  
Food Storage ◽  
Compression Rate ◽  
Beneficial Effects ◽  
C 71 ◽  
Frozen Potatoes ◽  
Full Factorial

Isochoric freezing is a pressure freezing technique that could be used to retain the beneficial effects of food storage at temperatures below their freezing point without ice damage. In this study, potato cylinders were frozen in an isochoric system and examined using full factorial combinations of three processing procedures (immersed in water, vacuum-packed and immersed in ascorbic acid solution), four freezing temperatures/pressures (−3 °C/37 MPa, −6 °C/71 MPa, −9 °C/101 MPa and −15 °C/156 MPa) and two average compression rates (less than 0.02 and more than 0.16 MPa/s). The effects of process variables on critical quality attributes of frozen potatoes after thawing were investigated, including mass change, volume change, water holding capacity, color and texture. Processing procedure and freezing temperature/pressure were found to be highly significant factors, whereas the significance of the compression rate was lower. For the processing procedures, immersion in an isotonic solution of 5% ascorbic acid best preserved quality attributes. At the highest pressure level of 156 MPa and low compression rate of 0.02 MPa/s, potato samples immersed in ascorbic acid retained their color, 98.5% mass and 84% elasticity modulus value. These samples also showed a 1% increase in volume and 13% increase in maximum stress due to pressure-induced hardening.

scholarly journals Design and construction of a cold room with photovoltaic support for lighting

2020 ◽  
Vol 3 (1) ◽  
pp. 12-19
Author(s):  
Ricardo Fabricio Muñoz Farfán ◽  
Telly Yarita Macías Zambrano ◽  
Victor Manuel Delgado Sosa ◽  
Jorge Daniel Menéndez López ◽  
Germán Temístocles Ramos León
Keyword(s):  
Electrical Equipment ◽  
Industrial Processes ◽  
Variable Rate ◽  
Refrigeration System ◽  
Food Sector ◽  
Air Conditioning System ◽  
Average Temperature ◽  
Cold Room ◽  
Rate Testing ◽  
Agricultural Food

One of the problems encountered today is the inefficiency of refrigeration systems and electrical equipment. The present study proposes the manufacture of a refrigeration chamber that responds to a great variety of needs both in industrial processes, medicine, and domestic service, becoming an indispensable process within the socio-productive sector. The proposed system has an investigative scope, as a contribution to the agricultural food sector for the derivation of variables and the behavior of products (plants-food) and its method of conservation for quality towards the consumer. The type of investigation responds to the experimentation supported by an observation card with variable rate testing tests. Given the aforementioned, a freezing and refrigeration system is elaborated, taking advantage and optimizing an air conditioning system that works up to 24°C in the room and under the modification obtain temperatures of -15°C, starting from an average temperature of 29°C and a 65% relative humidity of the outside.

scholarly journals FREON COOLING MINISYSTEM USING CIRCULAR MICRO-CHANNELS

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
LILIANA PĂTULEANU ◽  
IOAN-COZMIN MANOLACHE-RUSU ◽  
TIBERIU BURDAN ◽  
FLORIN ANDRONIC ◽  
IVAN RADION
Keyword(s):  
Processing Speed ◽  
Heat Exchangers ◽  
Mechanical Compression ◽  
Refrigeration System ◽  
Electronic Components ◽  
Local Cooling ◽  
New Methods ◽  
Micro Channels ◽  
Nano Channel ◽  
Set Up

<p>The necessity of a higher data processing speed was crucial for the advances in computer science. There were created processors that needed increasingly more power, so that new methods were discovered and more complex systems were created in order to solve the cooling issue. In this paper, there are presented the trials performed on a mini refrigeration plant that used mechanical compression of Freon’s, designed to cool electronic components like microprocessors, microcontrollers, graphic stations, or in the case of local cooling in diverse areas such as bioengineering, optics and nanotechnologies. The refrigeration system was constructed as an experimental set-up and consists of the following: two mini heat exchangers, working both as a condenser and a vaporizer, which are made of circular micro channels, a refrigeration compressor, lamination valve which contains a circular nano channel and a micro filter. The experimental determinations have proven that, although such a system contains a small quantity of Freon, of the order of milligrams, it reaches temperatures of -44 °C.</p>

Effect of Particle Size on the Lamellar Pore Microstructure of Porous Al2O3 Ceramics Fabricated by the Unidirectional Freezing

2012 ◽  
Vol 184-185 ◽  
pp. 818-825 ◽  
Author(s):  
Xiao Yong Zhang ◽  
Yan Zhang ◽  
Dou Zhang
Keyword(s):  
Freezing Temperature ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Freezing Process ◽  
Pore Channel ◽  
Nucleation Sites ◽  
Lower Porosity ◽  
Effect Of Particle Size ◽  
Pore Microstructure ◽  
Directional Freezing

Porous Al2O3 ceramics with a lamellar pore microstructure have been fabricated by a directional freezing process using the micro-sized and nano-sized Al2O3 powders. At the same solid loading and freezing temperature, compared with the suspensions of micro-sized Al2O3, the porous ceramics prepared from the suspensions of nano-sized Al2O3 had the narrower lamellar pore channels and thicker channel walls, which were caused by the higher viscosity, stronger inter-particle attraction and more ice nucleation sites in the nano-sized Al2O3 suspensions. For both types of Al2O3 at a specific solid loading, with the increasing of freezing temperature, the wider pore channels and thinner channel walls were observed. These tendencies were weaker by using the nano-sized Al2O3 . The above results show the lower porosity in the ceramics using the nano-sized Al2O3. However, due to the higher sintering activity for the smaller particles, the pore channel walls by using the nano-sized Al2O3 was denser than using the micro-sized Al2O3, leading to the higher mechanical strength of ceramics.

scholarly journals Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

2019 ◽  
Vol 2019 ◽  
pp. 1-20 ◽  
Author(s):  
Bin Wang ◽  
Chuan-xin Rong ◽  
Jian Lin ◽  
Hua Cheng ◽  
Hai-bing Cai
Keyword(s):  
Temperature Field ◽  
Groundwater Flow ◽  
Flow Velocity ◽  
Flow Rate ◽  
Freezing Temperature ◽  
Freezing Process ◽  
Flow Rates ◽  
Porosity Reduction ◽  
Shaft Sinking ◽  
Large Flow

Taking into account moisture migration and heat change during the soil freezing process, as well as the influence of absolute porosity reduction on seepage during the freezing process, we construct a numerical model of hydrothermal coupling using laws of conservation of energy and mass. The model is verified by the results of large-scale laboratory tests. By applying the numerical calculation model to the formation of artificial shaft freezing temperature fields under the action of large-flow groundwater, we conclude that groundwater with flow rates of less than 5 m/d will not have a significant impact on the artificial freezing temperature field. The maximum flow rates that can be handled by single-row freezing pipes and double-row freezing pipes are 10 m/d and 20 m/d, respectively, during the process of freezing shaft sinking. By analyzing the variation of groundwater flow rate during freezing process, we find that the groundwater flow velocity can reach 5–7 times the initial flow velocity near the closure moment of the frozen wall. Finally, in light of the action characteristics of groundwater on the freezing temperature field, we make suggestions for optimal pipe and row spacing in freezing pipe arrangement.

DWELLING FACTORS EFFECT ON RESIDENTIAL BUILDING ENERGY CONSUMPTION

2015 ◽  
Vol 77 (15) ◽  
Author(s):  
Jibrin Hassan Suleiman ◽  
Saeed Balubaid ◽  
Nasiru Mohammed Zakari ◽  
Egba Ernest Ituma
Keyword(s):  
Energy Consumption ◽  
Residential Buildings ◽  
Residential Building ◽  
Building Energy ◽  
Building Energy Consumption ◽  
Refrigeration System ◽  
Rapid Urbanization ◽  
Air Conditioning System ◽  
Household Heads ◽  
Self Administered Questionnaire

Most of the developing countries experience rapid urbanization and population growth, Malaysia is among these countries as the population and the energy consumption in the country tremendously increased over the last few decades.  A major challenge is the rate of energy consumption in the country is tremendous going higher which is a threat as the country was listed 26th out of the 30 top greenhouse emitters in the world.  A survey was conducted on the ways occupants’ consumes energy in their residential buildings in relation to dwelling factors in the State of Johor Malaysia. Energy consumption of the residential owners was assessed using drop and pick self-administered questionnaire. The questionnaires were answered by each household heads. Air conditioning system, refrigeration system, kitchen appliances, bathroom and laundry appliances, lighting appliances as well as other home appliances was considered in the survey. Correlation analysis was used using Statistical Package for Social Sciences (SPSS) to analyze the results. The finding shows a positive relationship between dwelling factors.  r ≥ 0.3 and above between dwelling factors and residential building energy consumption. 

Energetic and exergetic investigation of a novel solar assisted mechanical compression refrigeration system

2017 ◽  
Vol 147 ◽  
pp. 1-18 ◽  
Author(s):  
Evangelos Bellos ◽  
Michalis Gr. Vrachopoulos ◽  
Christos Tzivanidis
Keyword(s):  
Mechanical Compression ◽  
Refrigeration System

Advanced Solar-Assisted Cascade Ejector Cooling / CO2 Sub-Critical Mechanical Compression Refrigeration System

2011 ◽  
Author(s):  
V.O. Petrenko ◽  
Chien Te Liu ◽  
Kostyantyn Shestopalov ◽  
Volodymyr Ierin ◽  
Oleksiy Volovyk ◽  
...  
Keyword(s):  
Mechanical Compression ◽  
Refrigeration System

THE QUANTITATIVE ESTIMATION OF FROST INJURY AND RESISTANCE IN BLACK LOCUST, ALFALFA, AND WHEAT TISSUES BY DETERMINATION OF AMINO ACIDS AND OTHER NINHYDRIN-REACTING SUBSTANCES RELEASED AFTER THAWING

1964 ◽  
Vol 42 (6) ◽  
pp. 637-649 ◽  
Author(s):  
D. Siminovitch ◽  
H. Therrien ◽  
F. Gfeller ◽  
B. Rheaume
Keyword(s):  
Amino Acids ◽  
Black Locust ◽  
Quantitative Estimation ◽  
Freezing Temperature ◽  
Freezing Injury ◽  
Tree Bark ◽  
Freezing Process ◽  
Frost Injury ◽  
Ninhydrin Reaction

Amino acids and other soluble α-amino compounds are liberated into a leaching medium from tissues of black locust bark, alfalfa, and wheat that are frozen to temperatures which are injurious to the tissues. The amounts liberated increase with lowering in freezing temperature and are proportional to the loss in vital capacity of the tissue. Insignificant amounts of amino acids are released by leaching of non-frozen tissue while a maximum is reached at freezing temperatures which are completely lethal. The amino acids liberated from frozen and thawed tissues must originate from the destruction of living cells by the freezing process. The determination of the concentration of amino acids in the medium in which the plant tissues are leached after freezing can be used therefore as a quantitative method for the estimation of the injury sustained in the freezing.The use of the ninhydrin reaction for the purpose of this determination is described and its application to the estimation of freezing injury and resistance in a variety of hardy and non-hardy tissues of alfalfa, wheat, and black locust tree bark is shown. The extension of this procedure to the determination of injury produced by toxic and other detrimental agents is indicated.

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