Comparative analysis on thermal performance of different wall insulation forms under the air-conditioning intermittent operation in summer

Composition of cooling load formed by non-transparent envelopes of a common office building under air-conditioning intermittent operation

“…Meanwhile, the experimental result of Zhang et al (2017a) showed that the interior thermal insulation wall had the smallest heat flow value, which was 35%-86% less than the exterior thermal insulation wall and the sandwich thermal insulation wall under air-conditioning intermittent operation. Similar conclusions were obtained by the experimental research of Meng et al (2018c) on the thermal performance analysis of interior walls under heating intermittent operation in the same experimental platform with Zhang et al (2017a). Ibrahim et al (2012) optimized the position and thickness of insulation layers in the exterior wall for climates in the coastal Mediterranean zone and in the inland plateau of Lebanon by numerical simulation.…”

“…Due to the fact that the heat transfer loss in envelopes accounts for 50%-80% of the total heat transfer loss (Fang et al, 2014;Guo et al, 2012;Meng et al, 2015b;Peng et al, 2014), it is of vital importance to improve the thermal performance of the building envelope, especially the wall body, with the purpose of creating high comfort level and decreasing building energy consumption (Jelle, 2011;Meng et al, 2015a). Meng et al (2018c) compared thermal performance of five typical wall insulation configurations with the same heat transfer coefficients under air-conditioning intermittent operation and proposed that the interior insulation was more suitable for the wall insulation configuration with the highest energysaving ratio of 52%-65%. Meanwhile, the experimental result of Zhang et al (2017a) showed that the interior thermal insulation wall had the smallest heat flow value, which was 35%-86% less than the exterior thermal insulation wall and the sandwich thermal insulation wall under air-conditioning intermittent operation.…”

“…Table 1. A summary on the thermal performance analysis on non-transparent envelopes under air-conditioning intermittent operation (Barrios et al, 2012;Hou et al, 2018;Ibrahim et al, 2012;Li et al, 2018;Meng et al, 2018aMeng et al, , 2018bMeng et al, , 2018cRuan et al, 2015;Yan et al, 2015;Yuan et al, 2017;Zhang et al, 2017a) Aimed at this, a common office building was chosen and inner surface heat flows in the studied room were measured under the intermittent different groups of airconditioning in the adjacent rooms. Three typical rooms with the different areas were considered with one and two exterior walls, and combined with envelop areas and heat flow values, the heat transfer capacity through the different envelopes could be gained to analyze the composition characteristic on cooling load formed by non-transparent envelopes of a common office building under air-conditioning intermittent operation.…”

Effectiveness of the thermal mass of external walls on residential buildings for part-time part-space heating and cooling using the state-space method

“…Most of the aforementioned studies on building thermal insulation are useful but the impact of thermal insulation placement within the external wall compositions should be clarified further, as even external walls with the same thermal mass (identical U-value) but different insulation orders within the wall would probably perform differently for building energy efficiency. Numerical simulation done by Meng et al [25] showed that different wall insulation forms had a remarkable effect on the temperature response rate and the heat flow of the inner surface under intermittent air-conditioning operation, although they had the same heat 9 transmittance coefficients. Al-Sanea et al [26] pointed out that thermal mass should be placed on the inside, relative to the insulation layer, under steady periodic conditions.…”

Effects of Configurations of Internal Walls on the Threshold Value of Operation Hours for Intermittent Heating Systems

“…Tsilingiris [10] investigated the effect of thermal resistance and heat capacity as well as thermal constant on the heat exchange through the building envelope by implicit finite-difference method. Meng [11] and Zhang [12] analyzed the temperature response rate and the heat flow of different wall insulation forms under intermittent and continuous operation in summer by simulative and experimental method, respectively. Yuan et al [13] analyzed the effects of insulation and thermal resistance on dynamic heat transfer of building walls by combining mathematical models and numerical solutions.…”