scholarly journals Effect of the thermal insulation layer location on wall dynamic thermal response rate under the air-conditioning intermittent operation

2017 ◽  
Vol 10 ◽  
pp. 79-85 ◽  
Author(s):  
Lili Zhang ◽  
Tao Luo ◽  
Xi Meng ◽  
Yating Wang ◽  
Chaoping Hou ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Air Conditioning ◽  
Response Rate ◽  
Thermal Response ◽  
Insulation Layer ◽  
Intermittent Operation

scholarly journals Effect of the thermal insulation wall under the air-conditioning intermittent operation

2019 ◽  
Vol 310 ◽  
pp. 032070
Author(s):  
Meng Yuan ◽  
Yisheng Huang ◽  
Jiayi He ◽  
Jialun Li ◽  
Ruochen Xu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Air Conditioning ◽  
Intermittent Operation ◽  
Insulation Wall

A bridge-arched and layer-structured hollow melamine foam/reduced graphene oxide composite with an enlarged evaporation area and superior thermal insulation for high-performance solar steam generation

2020 ◽  
Vol 8 (5) ◽  
pp. 2701-2711 ◽  
Author(s):  
Sen Meng ◽  
Xing Zhao ◽  
Chun-Yan Tang ◽  
Peng Yu ◽  
Rui-Ying Bao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Thermal Insulation ◽  
High Performance ◽  
High Efficiency ◽  
Insulation Layer ◽  
Steam Generation ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Solar Steam Generation

A bridge-arched integrated evaporator that introduces air as the thermal insulation layer exhibits high-efficiency solar steam generation.

Study on Spread of Fire Overflow on Building Facades with Insulation Materials

2013 ◽  
Vol 405-408 ◽  
pp. 2438-2442
Author(s):  
Yan Feng Li ◽  
Cong Cong Xu ◽  
Xue Fei Xing ◽  
Jin Zhang ◽  
Cheng Hu
Keyword(s):  
Numerical Simulation ◽  
Thermal Insulation ◽  
Maximum Temperature ◽  
Computational Results ◽  
Exterior Wall ◽  
Insulation Layer ◽  
Insulation System ◽  
High Rise ◽  
Building Facades ◽  
Fire Barrier

Fire overflow on exterior wall with thermal insulation system has been studied by numerical simulation. The spread laws of fire overflow are analyzed through the temperature distribution near the window. The computational results are compared with those of test in the Exterior Insulation Fire Barrier Technical Guidelines (EIFBTG). It has been found that the calculated maximum temperature points is closed to the test on the first floor, the first ceiling, and the points near the above two windows. However, there are differences between two kinds of results above two floors and ceilings, and the points near the first window. It has also shown that when the HHR is 7.5KW, the scope of damage of exterior thermal insulation layer is about 15 square meters near the window. The research would provide reference for fire protection design of exterior wall thermal insulation in the high-rise buildings.

scholarly journals Thermal Insulating Concrete Wall Panel Design for Sustainable Built Environment

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Ao Zhou ◽  
Kwun-Wah Wong ◽  
Denvid Lau
Keyword(s):  
Thermal Insulation ◽  
Air Conditioning ◽  
Heat Radiation ◽  
Wall Panel ◽  
Concrete Wall ◽  
Building Envelopes ◽  
Air Conditioning System ◽  
Sandwich Wall ◽  
Sandwich Wall Panel ◽  
Panel Design

Air-conditioning system plays a significant role in providing users a thermally comfortable indoor environment, which is a necessity in modern buildings. In order to save the vast energy consumed by air-conditioning system, the building envelopes in envelope-load dominated buildings should be well designed such that the unwanted heat gain and loss with environment can be minimized. In this paper, a new design of concrete wall panel that enhances thermal insulation of buildings by adding a gypsum layer inside concrete is presented. Experiments have been conducted for monitoring the temperature variation in both proposed sandwich wall panel and conventional concrete wall panel under a heat radiation source. For further understanding the thermal effect of such sandwich wall panel design from building scale, two three-story building models adopting different wall panel designs are constructed for evaluating the temperature distribution of entire buildings using finite element method. Both the experimental and simulation results have shown that the gypsum layer improves the thermal insulation performance by retarding the heat transfer across the building envelopes.

scholarly journals Inverted roof insulation kits and their durability

2018 ◽  
Vol 163 ◽  
pp. 08005 ◽  
Author(s):  
Barbara Francke ◽  
Robert Geryło
Keyword(s):  
Water Absorption ◽  
Thermal Insulation ◽  
Laboratory Tests ◽  
Expanded Polystyrene ◽  
Insulation Layer ◽  
Performance Properties ◽  
Climate Conditions ◽  
Freeze Thaw ◽  
Moisture Increase

In the paper there was analyzed a mechanism of loss of performance properties of inverted roof insulation kits resulted by moisture increase of the insulation layers. This problem is very important in such systems because the thermal insulation is placed above the waterproofing layer and is not protected against water absorption. Abovementioned problem is more and more common in the course of building’s utilization in Polish climate conditions. Because inverted roof kits are based on extruded polystyrene (XPS) and expanded polystyrene (EPS), those materials have been used in tested samples. The results of laboratory tests showed the phenomenon and its effect on durability and sustainability of roof covering performance. It was also found that the biggest influence on the increase of moisture in the thermal insulation layer has not the long term water absorption by immersion but freeze –thaw cycles.

scholarly journals Households’ adaptation in a warming climate. Air conditioning and thermal insulation choices

2019 ◽  
Vol 100 ◽  
pp. 136-157 ◽  
Author(s):  
Enrica De Cian ◽  
Filippo Pavanello ◽  
Teresa Randazzo ◽  
Malcolm N. Mistry ◽  
Marinella Davide
Keyword(s):  
Thermal Insulation ◽  
Air Conditioning ◽  
Warming Climate

scholarly journals Investigation of the Insulation Effect of Thermal Insulation Layer in the Seasonally Frozen Region Tunnel: A Case Study in the Zuomutai Tunnel, China

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Pengyu Zhao ◽  
Jianxun Chen ◽  
Yanbin Luo ◽  
Lijun Chen ◽  
Yao Li ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Air Temperature ◽  
Ground Surface ◽  
Maximum Temperature ◽  
Insulation Layer ◽  
Tunnel Length ◽  
Maximum Temperature Difference ◽  
Insulation Effect ◽  
Two Sides

In this study, a field temperature test was performed to reveal the insulation effect of the thermal insulation layer installed at lining surface. The thermal insulation layer is made of polyphenolic, and the thickness is 7 cm. According to the test results, the temperature of the thermal insulation layer and lining continuously changes with the air temperature in the tunnel in an approximately trigonometric function. The temperature of tunnel lining without thermal insulation layer is close to the air temperature, which results in the lining frost in winter. The maximum temperature difference between the two sides of the thermal insulation layer can be 27°C. In the section whose buried depth is more than 11.4 m, the temperature of lining with thermal insulation layer in winter is mainly influenced by the cold air in the tunnel. When the monthly mean and lowest daily mean air temperature are lower than −10°C and −14.3°C in the coldest month, the temperature at the inner side of the thermal insulation layer is below 0°C. When the buried depth is less than 11.4 m, the temperature of lining is also influenced by the low temperature at ground surface. The temperature of lining is lower. The thicker thermal insulation layer and even active heat measure are needed. Therefore, the design of thermal insulation layer thickness should consider the air temperature distribution and tunnel buried depth along the tunnel length.

scholarly journals Feasibility of Using Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China

2019 ◽  
Vol 11 (3) ◽  
pp. 804 ◽  
Author(s):  
Qinglin Li ◽  
Haibin Wei ◽  
Leilei Han ◽  
Fuyu Wang ◽  
Yangpeng Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thermal Insulation ◽  
Oil Shale ◽  
Pollution Index ◽  
National Standards ◽  
Silty Clay ◽  
Insulation Layer ◽  
Insulation Property ◽  
Thermal Insulation Property ◽  
Seasonally Frozen Regions

To achieve the purposes of storing industry solid wastes and enhancing subgrade stability in seasonally frozen regions, Structure III, which utilized the modified silty clay (SC) and extruded polystyrene (XPS) board as a novel subgrade thermal insulation layer (NSTIL), was presented. The above modified SC consisted of oil shale industry solid waste, fly ash and SC. In terms of environmental impact, the average single pollution index, the Nemerow integrated pollution index and national standards were carried out to estimate whether the modified SC could be used as a subgrade filler. These results show that, although the modified SC will produce pollution to the environmental background, the concentration of each hydrochemical constituent from the modified SC meets the corresponding national standards in China. In terms of the thermal insulation capability, the numerical simulation of coupling moisture and temperature was applied to analyze that of Structures I, II and III. The research results show that the numerical results of the Structure I are approximated to the official website information of Jilin province, indicating that the above numerical simulation is effective for coupling moisture and temperature of frozen soil. Both modified SC and NSTIL have the advantage of good thermal insulation property, but the thermal insulation property of the NSTIL is greater. Furthermore, the NSTIL at the top of the Structure III can protect the SC of the experimental road from the damage of frost heave. The research results are of great significance for reducing environmental pollution caused by oil shale industry solid waste and fly ash, increasing the utilization rate of industrial waste and enhancing the subgrade stability in seasonally frozen regions.

Paper 6: Some Basic Considerations in the Practice of Heating, Ventilating and Air-Conditioning

1967 ◽  
Vol 182 (5) ◽  
pp. 129-137
Author(s):  
W. H. Eccleston
Keyword(s):  
Air Conditioning ◽  
Response Rate ◽  
Water Systems ◽  
Thermal Capacity ◽  
Hot Water ◽  
Space Heating ◽  
Noise Attenuation ◽  
Cooling Towers ◽  
Steam Generation ◽  
Fuel Savings

This paper covers some of the basic considerations associated with the practice of heating, ventilating and air-conditioning in temperate climates. A diagrammatic representation of heat loss and gain for a room appears to provide a key to more accurate forecasting of fuel consumption for whole buildings. Further, the smaller the thermal capacity of the system and, therefore, the quicker the response rate, the larger is the possible scope for fuel savings. As far as space heating is concerned water systems are classified and there is reference to the more commonly used heat emitters and some of their characteristics. There is some reference to boiler power both for hot-water heating and steam generation. Ventilation is discussed in the context of terminal points; there is also a brief reference to noise attenuation in ducts and to balancing of systems. Air-conditioning is defined and the better known distribution methods are classified. Packaged water chillers are briefly examined and there are some suggestions regarding ‘mixing-units’. In addition there are some comments on cooling towers. In conclusion there is a plea for standardization and in this particular instance reference is made to specifications for mechanical services works.

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