Research on Computer Simulation of Human Thermal Comfort in Shanghai Summer Air-Conditioning Room Based on Response Surface Technology

2021 ◽  
Author(s):  
Kezhi Yu ◽  
Tong Zhang ◽  
YuTong Yang ◽  
Yanling Liu
Keyword(s):  
Computer Simulation ◽  
Thermal Comfort ◽  
Response Surface ◽  
Air Conditioning ◽  
Human Thermal Comfort ◽  
Conditioning Room

scholarly journals Evaporative Cooling Options for Building Air-Conditioning: A Comprehensive Study for Climatic Conditions of Multan (Pakistan)

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3061 ◽  
Author(s):  
Shazia Noor ◽  
Hadeed Ashraf ◽  
Muhammad Sultan ◽  
Zahid Mahmood Khan
Keyword(s):  
Thermal Comfort ◽  
Co2 Emissions ◽  
Air Conditioning ◽  
Evaporative Cooling ◽  
Cooling Capacity ◽  
Climatic Conditions ◽  
Maximum Temperature ◽  
Human Thermal Comfort ◽  
Work Input ◽  
System Configurations

This study provides comprehensive details of evaporative cooling options for building air-conditioning (AC) in Multan (Pakistan). Standalone evaporative cooling and standalone vapor compression AC (VCAC) systems are commonly used in Pakistan. Therefore, seven AC system configurations comprising of direct evaporative cooling (DEC), indirect evaporative cooling (IEC), VCAC, and their possible combinations, are explored for the climatic conditions of Multan. The study aims to explore the optimum AC system configuration for the building AC from the viewpoints of cooling capacity, system performance, energy consumption, and CO2 emissions. A simulation model was designed in DesignBuilder and simulated using EnergyPlus in order to optimize the applicability of the proposed systems. The standalone VCAC and hybrid IEC-VCAC & IEC-DEC-VCAC system configurations could achieve the desired human thermal comfort. The standalone DEC resulted in a maximum COP of 4.5, whereas, it was 2.1 in case of the hybrid IEC-DEC-VCAC system. The hybrid IEC-DEC-VCAC system achieved maximum temperature gradient (21 °C) and relatively less CO2 emissions as compared to standalone VCAC. In addition, it provided maximum cooling capacity (184 kW for work input of 100 kW), which is 85% higher than the standalone DEC system. Furthermore, it achieved neutral to slightly cool human thermal comfort i.e., 0 to −1 predicted mean vote and 30% of predicted percentage dissatisfied. Thus, the study concludes the hybrid IEC-DEC-VCAC as an optimum configuration for building AC in Multan.

A dynamic model for human thermal comfort for smart building applications

2019 ◽  
Vol 234 (4) ◽  
pp. 472-483
Author(s):  
Ghezlane Halhoul Merabet ◽  
Mohamed Essaaidi ◽  
Driss Benhaddou
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Research Work ◽  
Comfort Level ◽  
Indoor Environments ◽  
Air Conditioning System ◽  
Human Thermal Comfort ◽  
Local Quality ◽  
Set Up ◽  
Air Conditioning Systems

Thermal comfort is closely related to the evaluation of heating, ventilation, and air conditioning systems. It can be seen as the result of the perception of the occupants of a given environment, and it is the product of the interaction of a number of personal and environmental factors. Otherwise, comfort issues still do not play an important role in the daily operation of commercial buildings. However, in the workplace, local quality effects, in addition to the health, the productivity that has a significant impact on the performance of the activities. In this regard, researchers have conducted, for decades, investigations related to thermal comfort and indoor environments, which includes developing models and indices through experimentations to establish standards to evaluate comfort and factors and set-up parameters for heating, ventilation, and air conditioning systems. However, to our best knowledge, most of the research work reported in the literature deals only with parameters that are not dynamically tracked. This work aims to propose a prototype for comfort measuring through a wireless sensor network and then presenting a model for thermal comfort prediction. The developed model can be used to set up a heating, ventilation, and air conditioning system to meet the expected comfort level. In particular, the obtained results show that there is a strong correlation between users’ comfort and variables such as age, gender, and body mass index as a function of height and weight.

Method for Mapping from Thermal Comfort Requirements to Energy Design Factors of Air-Conditioning

2013 ◽  
Vol 353-356 ◽  
pp. 3145-3148
Author(s):  
Yan Wang ◽  
Guang Fu Liu ◽  
Lei Zhang ◽  
Dan Zhou
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Fuzzy Mathematics ◽  
House Of Quality ◽  
Energy Characteristics ◽  
Design Objective ◽  
Human Thermal Comfort ◽  
Use Stage ◽  
Design Factors ◽  
Energy Property

In order to satisfy human thermal comfort requirements (TCRS), meanwhile, optimize air-conditioning energy property in use stage as design objective, a model of mapping from TCRS to energy design factors (EDFs) of air-conditioning based on house of quality was presented. Through determining the elements of TCRS, analyzing the relevance information between the TCRS and energy property, and extracting EDFs of air-conditioning in use stage, the connection with TCRS, air-conditioning energy characteristics and EDFs were illustrated by the house of quality. The importance degree of EDFs was calculated by using rough number and fuzzy mathematics, and so that the mapping from TCRS to EDFs of air-conditioning was realized.

scholarly journals Solar assisted cooling rule in indoor air quality

2020 ◽  
Vol 10 (4) ◽  
pp. 3948
Author(s):  
Ali M. Baniyounes ◽  
Yazeed Y. Ghadi
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cooling System ◽  
Internal Heat ◽  
Subtropical Climate ◽  
Mould Growth ◽  
Human Thermal Comfort

<p>Indoor air quality as always is the centre of attention for researchers, architect developers and public health officials. As every-one know. The human exposure to a variety of indoor pollutants and the high cost of energy are the motivation for these kinds of studies. Fungus and mould growth has always been a problem in subtropical climate areas due to the high temperature and high humidity. Generally in institutional buildings, most of the internal heat load is generated by human body and thermal comfort is achieved with   extensive usage of recycled air and air conditioning. The main considerations in any air conditioning system economisers are based on the usage of recycled air and air ventilation. The current practice in an institutional building cooling system under subtropical climate is to curb the mould issue by overcooling large recirculation airflow to remove the moisture content from the air, which is considered as an expensive practice. The use of a solar desiccant cooling system to reduce moisture from the air and to improve indoor air quality is found to be economical, environmental friendly and readily achievable in the tropics. This technology is the future alternative to the conventional vapour compression cooling system to maintain human thermal comfort conditions and enhance indoor air quality. Solar desiccant cooling systems are also environmentally friendly and energy efficient. This paper presents review on a solar desiccant cooling system and its effect on indoor air quality. It first introduces the issue of air moisture, mould growth and indoor air quality and then the development and application of thermally activated desiccant cooling technologies.</p>

Evaluation of Thermal Comfort in an Air Conditioning Room Using a CFD Model

2011 ◽  
Vol 354-355 ◽  
pp. 717-721
Author(s):  
Fu Qiang Guo ◽  
Rui Bin Mei ◽  
Lei Zhang ◽  
Jun Wei Fan ◽  
Min Xue Li ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Work Environment ◽  
Air Conditioning ◽  
Theory And Practice ◽  
Cfd Model ◽  
Air Velocity ◽  
Airflow Velocity ◽  
Conditioning Room ◽  
Air Conditioning Systems ◽  
Good Agreement

In order to obtain the thermal comfort work environment, the distribution of temperature and airflow velocity in typical computer room of school building is discussed with different supply air angles and velocities of incidence by CFD model. The calculated temperature after cooling in the room has a good agreement with the measured value. Furthermore, the distribution of temperature and airflow is uniform and the environment is comfort for working with supply air angles and velocity of incidence 45° and 60° and supply air velocity of incidence 1m/s comparing with that of other parameters. Additionally, the change of temperature becomes slow down with the increment of time and the air-conditioning has less influence on the change of temperature after about 900s with supply air angle and velocity of incidence 45°and 1m/s, respectively. The research is of great significance both in theory and practice to design air conditioning systems and evaluate the thermal comfort conditions.

Evaluation of Human Thermal Comfort Using Near-Infrared Spectroscopy

2014 ◽  
Author(s):  
Keiichi Watanuki ◽  
Lei Hou ◽  
Yuuki Kondou
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Brain Activation ◽  
Indoor Temperature ◽  
Prefrontal Area ◽  
Human Thermal Comfort ◽  
Conditioning Control

Air-conditioning equipment is used in various places such as houses, office buildings, and public facilities and is indispensable in modern-day life. Therefore, the energy consumption of air-conditioning equipment accounts for a large percentage of the total energy consumption in the average household. Specifically, it accounts for 26% of the annual energy consumption in ordinary homes and 27% in industry, according to the Annual Energy Report for Japan, which was presented by the Ministry of the Economy, Trade, and Industry, and the Agency for Natural Resources and Energy in 2010. Therefore, it is desirable to reduce energy consumption by reducing the air-conditioning load. The Ministry of the Environment recommends a constant preset temperature of 28°C in summer to decrease energy consumption. However, many people feel uncomfortable in such a thermal environment. Thus, an air-conditioning control to simultaneously suppress energy consumption and maintain human thermal comfort is desired. To develop such a control, an index to accurately evaluate human thermal comfort is needed. When a person feels comfortable or uncomfortable, their prefrontal area, which is involved in thinking and the feeling of emotions, is activated. It is presumed that the measurement of the brain activation reaction of a person will reveal whether the person feels comfortable or uncomfortable in the thermal environment. The evaluation of thermal comfort by means of brain activation reactions will allow one to develop the optimum air-conditioning control to maintain human thermal comfort. This paper proposes a method to evaluate thermal comfort via brain signals and ultimately aims to develop an air-conditioning control system utilizing this evaluation method. This paper will describe the measurement procedure of brain activation reactions to indoor-temperature change by using near-infrared spectroscopy and the relationship between thermal comfort and brain activation reaction. This study also investigated the changes in oxyHb levels together with indoor-temperature changes, measured with the NIRS. We measured the changes in the oxyHb levels of the prefrontal area when the temperature increased and decreased. As a result, the oxyHb level in the prefrontal area correlated with the indoor-temperature change, the PMV, and the subjects’ declaration of thermal sensation. Conversely, the change in the oxyHb level with the inclusion of wind and a constant indoor temperature significantly differed with that with a varying indoor temperature. Furthermore, the oxyHb change correlated with the PMV and the subject’s declaration of thermal sensation. Therefore, the measured oxyHb change may represent the thermal comfort of a person.

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