Comparative assessment of external and internal thermal insulation for energy conservation of intermittently air-conditioned buildings

2018 ◽  
Vol 42 (4) ◽  
pp. 568-584 ◽  
Author(s):  
Xu Zhang ◽  
Fei Cheng
Keyword(s):  
Energy Conservation ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Operation Mode ◽  
Comparative Assessment ◽  
Air Conditioner ◽  
Exterior Wall ◽  
Heat Gain ◽  
Building Occupancy

A comparative assessment of external and internal thermal insulation for an intermittently air-conditioned building was performed numerically. The energy consumed for cooling was used to evaluate the exterior wall thermal insulation configurations. This study examined the effect of the building occupancy, the air conditioner operation mode, and the lumped indoor heat gain. The results showed that the external thermal insulation configuration provides better thermal performance than the internal insulation configuration when the building was occupied during the day. When the building was occupied during the night, the internal thermal insulation configuration showed better thermal performance if the air conditioner runs continuously during occupied hours. When the air conditioner runs intermittently by applying building thermal storage, the suitable thermal insulation configuration depended on the lumped indoor heat gain. The determination of the exterior wall insulation configuration should consider three factors: the building occupancy, the air conditioner operation mode, and the lumped indoor heat gain.

Energy Conservation Analysis on Self-Thermal Insulation Walls Structural System in Cold Areas

2012 ◽  
Vol 608-609 ◽  
pp. 1778-1782 ◽  
Author(s):  
Li Bai ◽  
Yi Ran Zhang ◽  
Jia Rui Chu
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Building Energy ◽  
Simulation Software ◽  
Air Conditioner ◽  
Building Energy Conservation ◽  
Modeling Analysis ◽  
Building Wall ◽  
Saving Effect

Analysis of Chinese current development status of wall insulation technology, aim at the importance of building energy conservation in cold areas. Point out that developing energy-saving building wall is the key to development of building energy saving. In this paper, put a kind of an advanced self-thermal insulation walls as an example in Changchun area. Adopt Tsinghua university’s building thermal environmental simulation software DeST-c. Modeling analysis of building’s heating air conditioner operation consumption in the whole year under three different kinds of walls. Through the comparison we know that the structure adopting new self-thermal insulation wall has the most remarkable energy saving effect.

Analysis on Heat Loss Due to Improper Opening Window of Teaching Building

2012 ◽  
Vol 512-515 ◽  
pp. 2726-2729
Author(s):  
Rui Wang ◽  
Jing Ye Zhao ◽  
Wen Hai Wang
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Exterior Wall ◽  
Long Time

By taking a teaching building of one university in Beijing as an example, this paper calculated the heat loss owing to long time opening window of classrooms in winter and compared the heat loss to the heat which is saved by external thermal insulation of exterior wall of the teaching building through method of air changes. The paper aims at enhancing people's awareness on energy saving and improving “Behavior Energy Conservation” to the same status of "Technology Energy Conservation".

Application of Phenolic Foam Plate in the Exterior Wall Thermal Insulation

2012 ◽  
Vol 174-177 ◽  
pp. 1363-1366 ◽  
Author(s):  
Jia Wei Yao ◽  
Zhao Ming Hou ◽  
Yi Shu Yao
Keyword(s):  
Energy Conservation ◽  
Thermal Insulation ◽  
National Policy ◽  
Building Energy ◽  
Fire Prevention ◽  
Exterior Wall ◽  
Building Energy Conservation ◽  
Building Insulation ◽  
Phenolic Foam ◽  
Development Opportunity

With the deep reform of national policy of building energy conservation and the increasing requirements of building fire protection, building insulation industry appeared a hitherto unknown development opportunity and challenge. This paper introduces the research and application of phenolic foam plate, modified phenolic foam plate with thermal insulation, fire prevention, environmental protection and other excellent properties, puts forward in the field of building energy conservation should be vigorously promoted the application of phenolic foam.

Evaluating Thermal Performance and Energy Conservation Potential of Hybrid Earth Air Tunnel Heat Exchanger in Hot and Dry Climate—In Situ Measurement

2013 ◽  
Vol 5 (3) ◽  
Author(s):  
Rohit Misra ◽  
Vikas Bansal ◽  
Ghanshyam Das Agarwal ◽  
Jyotirmay Mathur ◽  
Tarun Aseri
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Energy Conservation ◽  
Thermal Performance ◽  
Cooling System ◽  
Ambient Air ◽  
Passive Cooling ◽  
Air Conditioner ◽  
Cooling Systems ◽  
Active Cooling

Earth air tunnel heat exchanger is a passive cooling device with advantageous feature to reduce energy consumption in buildings. Curtailing the electricity consumption of conventional vapor compression system based air-conditioner is a major concern especially in area with hot and dry weather conditions. The performance of conventional air-conditioners can substantially be enhanced by coupling these active cooling systems with passive cooling systems. In the present research, the thermal performance and energy conservation potential of hybrid cooling system has been investigated experimentally. An attempt has been made to enhance the thermal performance of active cooling system by coupling it with earth air tunnel heat exchanger (EATHE) in two different hybrid modes. The air which comes out of EATHE is relatively cooler than the ambient air and therefore can be used either for cooling the condenser tubes of a conventional window type air-conditioner or supplying it directly to the room being conditioned. The energy consumption of conventional 1.5TR window type air conditioner is found to be reduced by 16.11% when cold air from EATHE is completely used for condenser cooling.

scholarly journals The effect of air-conditioner operation modes on the energy-saving capacity of external wall insulation in residential buildings

2019 ◽  
pp. 014459871989582 ◽  
Author(s):  
Qinli Deng ◽  
Daoru Liu ◽  
Zeng Zhou ◽  
Sha Ma
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Residential Buildings ◽  
Temperature Tolerance ◽  
Air Conditioner ◽  
Exterior Wall ◽  
Energy Usage ◽  
Heating And Cooling ◽  
Saving Effect ◽  
Better Than

In this study, subjective questionnaires and a building energy simulation were utilized to investigate the impact of air conditioner operation on the energy consumption/savings of a model building with different types of exterior wall thermal insulation. The results indicate that an intermittent energy usage mode is generally used in residential buildings in hot summer and cold winter areas. Air conditioner operation behavior is affected by the human thermal experience. The greater the indoor temperature deviates from the human comfort range, the higher the air conditioner operation frequency. Under continuous energy usage mode, the annual heating and cooling effect of the exterior thermal insulation was found to be better than that of interior thermal insulation. Under the intermittent energy usage mode without considering residents’ temperature tolerance, the annual heating and cooling effect of the interior thermal insulation was better than that of the exterior insulation. Under the intermittent energy usage mode considering tolerance levels, the energy-saving effect of the interior and exterior thermal insulation of the exterior wall was different. In the case of low and medium temperature tolerance, the annual heating and cooling energy-saving effect of the interior thermal insulation was better than the exterior thermal insulation; in the case of high tolerance, the heating and cooling energy saving effect of the exterior thermal insulation was better.

Use of a hot-box facility to evaluate hybrid reflective insulation assemblies

2016 ◽  
Vol 40 (5) ◽  
pp. 417-424
Author(s):  
Jordan M. Church ◽  
Michael N. Blades ◽  
David W. Yarbrough
Keyword(s):  
Heat Flow ◽  
Thermal Resistance ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Test Facility ◽  
Standard Specification ◽  
Separate Layer ◽  
Flow Through ◽  
Calibration Material

The determination of the thermal performance of hybrid insulation assemblies that include an enclosed reflective airspace and a separate layer of insulation is being done using a hot-box test facility operated in accordance with ASTM C1224, the Standard Specification for Reflective Insulation. The thermal resistance determination of the insulated region requires a hot-box test with known thermal insulation to determine heat flow through the framing. Factors that affect the result for the hybrid insulation assembly will be discussed along with results obtained using the ASTM C1224 protocol. The thermal resistance obtained using the hot-box apparatus will be compared with calculated values obtained from published correlations. The uncertainty in the hybrid insulation assembly and the enclosed reflective airspace due to uncertainty in the thermal resistance of the calibration material are of particular interest.

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