scholarly journals A study on heat transfer load in large space buildings with stratified air-conditioning systems based on building energy modeling: Model validation and load analysis

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110361
Author(s):  
Yunqian Zhang ◽  
Jun Lu ◽  
Xin Jiang ◽  
Shuren Shen ◽  
Xin Wang
Keyword(s):  
Heat Transfer ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Building Energy ◽  
Energy Modeling ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Building Energy Modeling ◽  
Large Space ◽  
Air Conditioning System

The characteristics of heat transfer load from the non-air-conditioned (NAC) area can help to understand the complex airflow movement and thermal physical mechanisms inside large space buildings. Based on building energy modeling, the indoor thermal environment and building energy consumption of a plant for computerized numerical control (CNC) machine tools are studied. Considering the form of the stratified air-conditioning system and the phenomenon of heat retention near the roof in the plant, the double zone and triple zone models are established. The vertical air temperature, the parameters of the terminal of the air-conditioning system and the heat/cool source system of the plant in summer and winter were measured on site, which verifies the accuracy of the established model. Based on the validated model, the proportion of heat transfer load from the NAC area is calculated, at the range of about 60%–85%. The positive influence of the roof heat transfer coefficient on the sensible heat load in the NAC area is revealed. The recommended value of the non-dimensional zone-mixing flow rate between the air-conditioned (AC) and NAC areas is given, with 30% (in summer). The results of this work can help understand the composition of the stratified air-conditioning load in large spaces and optimize the design of air distribution.

A Study of Cooling Load Calculation of Stratified Air Conditioning System for Large Space Based on the Simultaneously Solving Model

2014 ◽  
Vol 672-674 ◽  
pp. 1755-1761 ◽  
Author(s):  
Ning Cai ◽  
Chen Huang
Keyword(s):  
Indoor Air ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Cooling Capacity ◽  
Cooling Load ◽  
Large Space ◽  
Air Conditioning System ◽  
Load Calculation ◽  
Environment Experiment ◽  
Wall Surface Temperature

A calculation method for cooling load of stratified air conditioning system based on the simultaneously solving model is presented. Thermal environment experiment under summer condition is carried out in a large space building, indoor air temperature, inner wall surface temperature and cooling capacity were obtained; the stratified air conditioning cooling load calculated by the simultaneously solving model is compared with air conditioning cooling capacity in experiment, the relative error is 14%, taking the loss of cooling capacity and leakage loss, it can be thought that the simultaneously solving model can be used to calculate cooling load of stratified air conditioning system.

Field Test for Heat and Humidity Environment and Analysis of Air-Conditioning System Consumption

2012 ◽  
Vol 610-613 ◽  
pp. 2875-2878
Author(s):  
Hui Xing Li ◽  
Wei Xiao ◽  
Geng Geng ◽  
Bei Ni Li ◽  
Wei Wang
Keyword(s):  
Energy Consumption ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Building Energy ◽  
Future Research ◽  
Main Body ◽  
Indoor Temperature ◽  
Air Conditioning System ◽  
Air Conditioning Systems ◽  
Humidity Environment

Museum has its particularity in public buildings and high research value for its thermal and humidity environment and building energy efficiency status. According to a investigation of air-conditioning systems and a test of indoor heat and humidity parameters in summer and winter for a museum in Shenyang, this article analysis its thermal environment and air-conditioning energy consumption status, draw the winter and summer indoor temperature and humidity and air-conditioning energy consumption chart, research the indoor temperature change rules and the energy consumption status of air-conditioning system in winter and summer. The results show that as air-conditioning energy consumption accounted for the main body of museum’s total building energy consumption, more energy-efficient technologies can be used to reduce the energy consumption of air-conditioning systems. And how to control the thermal environment of different types of collections in this museum, and take a consideration of energy saving, are focues of future research.

scholarly journals Integrating GIS-Based Point of Interest and Community Boundary Datasets for Urban Building Energy Modeling

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1049
Author(s):  
Zhang Deng ◽  
Yixing Chen ◽  
Xiao Pan ◽  
Zhiwen Peng ◽  
Jingjing Yang
Keyword(s):  
Large Scale ◽  
Residential Buildings ◽  
Building Energy ◽  
Energy Performance ◽  
Energy Modeling ◽  
Office Buildings ◽  
Building Energy Modeling ◽  
Downtown Area ◽  
Point Of Interest

Urban building energy modeling (UBEM) is arousing interest in building energy modeling, which requires a large building dataset as an input. Building use is a critical parameter to infer archetype buildings for UBEM. This paper presented a case study to determine building use for city-scale buildings by integrating the Geographic Information System (GIS) based point-of-interest (POI) and community boundary datasets. A total of 68,966 building footprints, 281,767 POI data, and 3367 community boundaries were collected for Changsha, China. The primary building use was determined when a building was inside a community boundary (i.e., hospital or residential boundary) or the building contained POI data with main attributes (i.e., hotel or office building). Clustering analysis was used to divide buildings into sub-types for better energy performance evaluation. The method successfully identified building uses for 47,428 buildings among 68,966 building footprints, including 34,401 residential buildings, 1039 office buildings, 141 shopping malls, and 932 hotels. A validation process was carried out for 7895 buildings in the downtown area, which showed an overall accuracy rate of 86%. A UBEM case study for 243 office buildings in the downtown area was developed with the information identified from the POI and community boundary datasets. The proposed building use determination method can be easily applied to other cities. We will integrate the historical aerial imagery to determine the year of construction for a large scale of buildings in the future.

Hybrid Dynamic-Empirical Building Energy Modeling Approach for an Existing Campus Building

2016 ◽  
Vol 22 (1) ◽  
pp. 04015010 ◽  
Author(s):  
William O. Collinge ◽  
Justin C. DeBlois ◽  
Amy E. Landis ◽  
Laura A. Schaefer ◽  
Melissa M. Bilec
Keyword(s):  
Building Energy ◽  
Energy Modeling ◽  
Building Energy Modeling ◽  
Modeling Approach ◽  
Campus Building

Air Conditioning System Water Quality and Equipment Condition Investigation and Analysis of Energy Saving Measures

2012 ◽  
Vol 516-517 ◽  
pp. 1224-1228
Author(s):  
Na Liang ◽  
Rui Li
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Water System ◽  
Building Energy ◽  
Development Trend ◽  
Air Conditioning System ◽  
Effective Utilization ◽  
Energy Saving Potential ◽  
Central Air Conditioning ◽  
Points Of View

Due to energy reserves reduces gradually and uneven distribution, all countries pay more and more attention to energy saving and improve the effective utilization of energy, China also attaches great important to this. Energy saving of buildings is a necessary development trend. Air conditioning system as a large important part of building energy consumption has a huge energy-saving potential. This article mainly introduced the related strategies of energy saving in central air conditioning water system from the following three points of view: the water treatment, the cooling tower, and the variable frequency pump.

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