Experimental study of performance of a dry cooling and dedicated ventilation (DCDV) system under different space cooling load conditions

Most of the shipped products are sensitive against shock and vibration events during the distribution. Various cushioning materials are usually used to prevent the product damages. During the design process the protective packaging system is developed by the engineers based on the cushion and vibration transmissibility features (ie. cushion curve) of the material used. However, after the assembly of the packaged-product, these are stored for various long periods in warehouse. During this time the products pre-load the cushioning material and its parameters can be changed. The main goal of this study is to evaluate the vibration transmissibility of PE and XPE cushioning material at varied storage (pre-loaded) time and static load conditions. Four different kinds of duration (1 hour, 10 hours, 100 hours and 1000 hours) were used for the pre-loading period at three different static loads (3.488 kPa, 4.651 kPa, and 6.976 kPa), and then at 0.5 oct/min sine sweep vibration the peak frequencies of response and vibration transmissibility, and damping ratio were determined. The results show that the effect of pre-loading is minimal by PE material, but can influence the resonance frequencies by XPE cushioning material. The findings of this study help the packaging engineers to understand better the mechanism of these cushioning materials and to design suitable protective packaging systems.

Download Full-text

Full scale experimental study of a small natural draft dry cooling tower for concentrating solar thermal power plant

Applied Energy ◽

10.1016/j.apenergy.2017.02.032 ◽

2017 ◽

Vol 193 ◽

pp. 15-27 ◽

Cited By ~ 28

Author(s):

Xiaoxiao Li ◽

Sam Duniam ◽

Hal Gurgenci ◽

Zhiqiang Guan ◽

Anand Veeraragavan

Keyword(s):

Experimental Study ◽

Power Plant ◽

Thermal Power Plant ◽

Cooling Tower ◽

Thermal Power ◽

Full Scale ◽

Natural Draft ◽

Solar Thermal Power ◽

Dry Cooling Tower ◽

Dry Cooling

Download Full-text

Thermal performance of silica aerogel-filled double-layer glazing in a subtropical climate

Materials Express ◽

10.1166/mex.2021.1978 ◽

2021 ◽

Vol 11 (6) ◽

pp. 974-981

Author(s):

Yajun Lv ◽

Yiming Qin ◽

Julian Wang ◽

Kui Yin ◽

Huanchun Huang ◽

...

Keyword(s):

Double Layer ◽

Silica Aerogel ◽

Energy Efficient ◽

Air Conditioning ◽

Weather Conditions ◽

Research Topic ◽

Outdoor Environment ◽

Subtropical Climate ◽

Cooling Load ◽

Space Cooling

Heat gain through glazing is a major source of the space cooling load in subtropical cooling-dominant climates. Application of energy-efficient glazing systems can significantly reduce the energy consumption of air conditioning in summer. Thus, it has become a popular research topic. In this study, a sample of silica aerogel glazing was developed and prepared. Two identical insulated boxes were then constructed; one faÇade was equipped with the aerogel glazing sample and the other was prepared with a conventional double-layer glazing. An onsite measurement of the boxes’ internal thermal properties was then conducted. The two boxes were placed within the same outdoor environment. The temperature, humidity, and enthalpy values were calculated with the boxes facing different orientations and in a variety of weather conditions. The performance of the silica aerogel glazing was then evaluated by both experimental and theoretical analysis. The results of this study will provide a basis for aerogel glass building application guidelines.

Download Full-text

The Study of the Flexural Capacity of Old and New Prestressed Concrete Hollow Slab Strengthened with CFRP

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.482.66 ◽

2013 ◽

Vol 482 ◽

pp. 66-69

Author(s):

Bin Jia ◽

Lei Fu ◽

Yu Zhang ◽

Yi Lu

Keyword(s):

Experimental Study ◽

Carbon Fiber ◽

Engineering Design ◽

Prestressed Concrete ◽

Reinforcement Effect ◽

Flexural Capacity ◽

Design Specifications ◽

Secondary Load ◽

Contrast Analysis ◽

Load Conditions

Prestressed hollow slab strengthened with CFRP is a new reinforcement method. To study the effect on reinforcement through different carbon fiber paste volume and paste manner, we did the experimental study on flexural capacity under the secondary load conditions with prestressed concrete hollow slab commonly used in engineering. Meanwhile, we also did the contrast analysis of reinforcement effect on the old and new prestressed concrete hollow slab. The results showed that prestressed concrete hollow slab strengthened with CFRP could effectively improve the flexural capacity of the specimen, besides the capacity increasing of the old and new prestressed hollow slab is a little difference, but both of the new and old can meet the engineering design specifications.

Download Full-text