Developing Refrigeration Equipment with Natural Refrigerants

Today, in world practice, a rapid increase in the rate of generation of household and industrial waste is noticeable, and Vietnam, as a developing country, this problem is especially tangible. With the development of industry and technology, one of the most problematic industries in terms of waste generation is the electrical and electronic equipment industry. The products of this industry are tightly integrated into all other sectors of human life, whether it is production (refrigeration equipment, machine tools, computers, monitors, communications, etc.) or everyday life (household appliances, mobile phones, game consoles, smart appliances, etc.). This article provides an analysis of the current situation with the recycling of waste electrical and electronic equipment in Vietnam, and provides recommendations for solving this problem.

Download Full-text

Material Parameter Determination in Glass Wool Mat for Sound Absorption

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.148-149.1271 ◽

2011 ◽

Vol 148-149 ◽

pp. 1271-1275 ◽

Cited By ~ 1

Author(s):

Cheng Dong Li ◽

Zhao Feng Chen ◽

Jie Ming Zhou ◽

Bin Bin Li ◽

Wang Ping Wu ◽

...

Keyword(s):

Absorption Coefficient ◽

Prediction Error ◽

Fiber Length ◽

Normal Incidence ◽

Glass Wool ◽

Parameter Determination ◽

Frequency Range ◽

Material Parameters ◽

Refrigeration Equipment ◽

Building Engineering

Glass wool mat is widely used in the fields of building engineering, transport facilities and refrigeration equipment. In this paper, the effect of material parameters such as density, thickness, porosity, and flow resistivity on the normal incidence absorption coefficient has been studied. In addition, fiber length is also investigated to achieve appropriate strength. The prediction error of normal incidence absorption coefficient by modified Johnson–Allard model is less than 5% in the frequency range between 800 Hz and 5 kHz. We could use the modified Johnson–Allard model to determine the parameter of glass wool mat for better development.

Download Full-text

Baffles, traps and refrigeration equipment

Vacuum ◽

10.1016/0042-207x(64)90842-5 ◽

1964 ◽

Vol 14 (1) ◽

pp. 28

Keyword(s):

Refrigeration Equipment

Download Full-text

The Analysis of Modifications in Cooling Systems for High-Performance Data Centers. A Case Study

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.273 ◽

2017 ◽

Author(s):

Artur Rusowicz ◽

Adam Ruciński ◽

Rafał Laskowski

Keyword(s):

Air Conditioning ◽

High Performance ◽

Energy Savings ◽

Cooling System ◽

Capital Expenditure ◽

Cooling Power ◽

Power Demand ◽

Excessive Heat ◽

Refrigeration Equipment ◽

Payback Time

One of main issues concerning server room operation is appropriate cooling of electronic modules to prevent excessive heat generation resulting in their damage. Since high cooling powers are required, precision air conditioning systems are used that are specially designed for cooling server and equipment rooms, server cabinets, etc. These devices require very large energy supplies. The paper proposes an upgrade of a cooling system for three server rooms in which refrigeration equipment with a cooling power of 1.873 MW is installed. The average actual cooling power demand is 890 kW, and some units work as a standby. Thir-eight direct-evaporation air-conditioning cabinets are installed. The refrigerant is R407C. The devices have been operated for 14 years; therefore, the refrigeration equipment should be replaced with modern units. The paper compares three approaches: replacing the units with similar ones based on newer technology, introducing contained aisle configurations of rack cabinets and units based on newer technology with additional EconoPhase modules. The application of free cooling was not analyzed since mounting additional heat exchangers was impossible (due to the lack of space and limited roof loading capacity). The paper provides capital and operating costs of the solutions. The introduction of up-to-date units and replacing condensers resulted in lowering the electric power demand by 16%. The simple payback time (SPBT) of this solution is 18.8 years. The energy savings achieved through the second solution (contained aisle configurations of rack cabinets) amount to 37.8%, with SPBT equal to 8.38 years. Variant III, consisting in using modern units with additional EconoPhase modules, significantly improves energy savings (48.3%) but it requires large capital expenditure, with simple payback time of 12.1 years.

Download Full-text