Prediction of temperature rise near condensing units in the confined space of a high-rise building

Han, Xue; Xu, Bin; Wu, Jian; Wei, Yao

doi:10.1016/j.buildenv.2006.06.011

Cited by 23 publications

(5 citation statements)

References 4 publications

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“…Zhu [3] et al used ABAQUS system to study the influence of two typical shield construction parameters, grouting pressure and face thrust, on the adjacent multi-layer frame structure. Yu [4], Cao [5] and others used MIDAS to analyze and establish a three-dimensional geological model to analyze building settlement. Guo [6], Zhang [7], Xu [8], Liang [9], Zhao [10], etc.…”

Section: Figure 1: the Proportion Of Urban Rail Transit Operation Rou...mentioning

confidence: 99%

Numerical simulation of the effect of tunnel excavation based on ABAQUS

2023

AJAGE

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With the gradual saturation of above-ground space and the continuous development of underground transportation, whether the tunnel excavation process will affect neighboring buildings has become a non-negligible issue. Based on the Qingdao Metro Line 3 project, this paper uses ABAQUS software combined with element deletion algorithm, Mohr-Coulomb yield criterion and element tracking method to establish a numerical model, and the results are as follows: (1) Compared with the vertical direction, the horizontal direction of the tunnel, that is, the stress on both sides is greater. In actual engineering, both sides of the tunnel should be reinforced in the presence of existing buildings above. ( 2) During the tunnel excavation, the maximum settlement of the existing buildings above is 6mm, which meets the engineering safety requirements and is more in line with the actual situation. Provide certain basis and guidance for similar projects.

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Section: Figure 1: the Proportion Of Urban Rail Transit Operation Rou...mentioning

confidence: 99%

Numerical simulation of the effect of tunnel excavation based on ABAQUS

2023

AJAGE

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“…A deeper recessed area results in a rise in the temperature of the airflow surrounding the condensing units and a drop in the temperature of the air surrounding the units. Xue [11] investigated numerical simulation of airflow and temperature distribution in an enclosed area of a 16-floor tall commercial building. It has been noticed that the space between the outdoor unit and the wall is a significant factor influencing temperature rise.…”

Section: Literature Reviewmentioning

confidence: 99%

CFD Simulation of Thermal Plume of VRF Air Conditioners for Cooling Season in Semi-Closed Spaces for Erbil Climate Conditions

Abdullah¹,

Barwari²

2022

IJHT

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The variable refrigerant flow (VRF) system is extensively utilized for the purpose of space cooling and heating in residential and commercial buildings. The VRF outdoor units are frequently placed on balconies of multi-storey buildings, and the aluminum louvers conceal them to keep the aesthetic architecture appearance. This type of installation will cause the thermal plume influence of the dissipated heat discharged from condensing units to cause high suction temperature, high energy consumption, and low coefficient of performance of the system. The numerical results showed that the discharged heat from condensing units will lead to rising thermal plume influence, causing greater suction temperatures for VRF outdoor units on top floors, even overriding the operating temperature range. It also shows that removing the inward louver in front of the discharge duct on each floor is an efficient method to deteriorate the thermal plume influence for VRF air conditioners and enhance the thermal efficiency of the entire system. For the proposed design, the average suction temperatures could be reduced by 8%, 15%, and 19% for VRF outdoor units for floors 10th, 11th, & 12th, respectively. This work aims to provide guidelines for the placement of VRF air conditioners in buildings in the designing stage.

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“…13 H. Xue et al studied the influence of the installation position of the outdoor unit and blowing velocity of the fan on the thermal environment around the outdoor unit through simulations, the results show that the distance between the walls of two buildings should not be less than 7 m and that the air temperature in the gap between the two buildings cannot be reduced by increasing the blowing velocity. 14,15 K. Ryu et al comprehensively considered the influence of the distance between the outdoor unit and external wall, ambient air velocity, and height of the external wall on the thermal environment around the outdoor unit and presented the best installation method for the outdoor unit. 16 SH.…”

Section: Introductionmentioning

confidence: 99%

Influence of the position of recessed outdoor units and louvre blade angle on the performance of split air conditioners

Jin

Cheng

Jiang

et al. 2021

Building Services Engineering Research and Technology

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In residential air conditioning systems, outdoor units are often installed in the recesses of building facades and shaded by louvres; however, different unit installation positions and louvre blade angles affect the thermal environment around the outdoor unit and the energy efficiency ratio (EER) of the air conditioner. In this study, the effects of the outdoor unit installation position and louvre blade angle on the EER when a single outdoor unit was installed in a recess were investigated by experiments on a 1.5 hp air conditioner (rated power of the air conditioner is 3.5 kW), and the influence of the spacing and angle between two outdoor units on the air conditioner EER when two outdoor units were installed in the same recess was explored. The results of the research indicate that when a single outdoor unit is installed in the recess, the EER increases with an increase in the distance between the inlet of the outdoor unit and the wall. To meet the three-level standard of air conditioner EERs, the distance between the inlet and wall needs to be greater than 300 mm. The EER first increased and then decreased slowly with the increase in the distance between the outdoor unit outlet and louvre; thus, the distance between the outlet and louvre should not be less than 300 mm. The EER first increased and then decreased with the increase in the blade angle, and thus, the blade angle should not be greater than 20°. When two outdoor units are installed in the same recess, each installation mode, “horizontal installation” (same height and collinear), “perpendicular installation” (same height and perpendicular), “angle installation” (same height and obtuse angle), and “up and down parallel installation” (different heights and parallel), has an optimum installation distance and angle.

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Prediction of temperature rise near condensing units in the confined space of a high-rise building

Cited by 23 publications

References 4 publications

Numerical simulation of the effect of tunnel excavation based on ABAQUS

Numerical simulation of the effect of tunnel excavation based on ABAQUS

CFD Simulation of Thermal Plume of VRF Air Conditioners for Cooling Season in Semi-Closed Spaces for Erbil Climate Conditions

Influence of the position of recessed outdoor units and louvre blade angle on the performance of split air conditioners

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