Optimization on non-transparent envelopes of the typical office rooms with air-conditioning under intermittent operation

Solar Energy ◽  
2020 ◽  
Vol 201 ◽  
pp. 798-809 ◽  
Author(s):  
Yanna Gao ◽  
Xi Meng ◽  
Xinyu Shi ◽  
Ziyun Wang ◽  
Enshen Long ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Intermittent Operation ◽  
Office Rooms

scholarly journals Effect of the thermal insulation wall under the air-conditioning intermittent operation

2019 ◽  
Vol 310 ◽  
pp. 032070
Author(s):  
Meng Yuan ◽  
Yisheng Huang ◽  
Jiayi He ◽  
Jialun Li ◽  
Ruochen Xu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Air Conditioning ◽  
Intermittent Operation ◽  
Insulation Wall

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

2019 ◽  
Vol 43 (6) ◽  
pp. 528-544 ◽  
Author(s):  
Xi Meng ◽  
Xinyu Shi ◽  
Yanna Gao ◽  
Tao Luo
Keyword(s):  
Heat Transfer ◽  
Heat Loss ◽  
Air Conditioning ◽  
Office Building ◽  
Cooling Load ◽  
Exterior Wall ◽  
Heat Flows ◽  
Intermittent Operation ◽  
Heat Transfer Capacity ◽  
Load Composition

Under air-conditioning intermittent operation, interior envelopes become the quasi-exterior ones of a partial room and thereby may cause the specified heat loss. However, it is unknown for the heat transfer capacity rate of interior envelopes in the room heat loss, which is of vital significance on the optimization direction of envelopes. To analyze the cooling load composition formed by non-transparent envelopes, an office building was chosen and inner surface heat flows in the studied room were measured under the different intermittent groups of air-conditioning in the adjacent rooms, and combined with the envelop area and heat flow values, the heat transfer capacity through the different envelops could be gained. The results showed that the air-conditioning operation in the adjacent rooms had a large effect on the heat transfer capacities, and the higher the room area, the more remarkable the air-conditioning operation in the adjacent rooms. The average heat transfer capacity rate of the exterior envelope was 21%–35% for room with two exterior walls and only 7%–10% for room with one exterior wall, which were much lower than those of the interior envelopes. It showed that thermal performance of the interior envelopes should be paid more attention to under air-conditioning intermittent operation.

scholarly journals Influence of Indoor Climate on Employees in Office Buildings—A Case Study

2020 ◽  
Vol 12 (14) ◽  
pp. 5569 ◽  
Author(s):  
Peter Kapalo ◽  
Silvia Vilčeková ◽  
Ľudmila Mečiarová ◽  
Florin Domnita ◽  
Mariusz Adamski
Keyword(s):  
Air Quality ◽  
Air Conditioning ◽  
Subjective Evaluation ◽  
Research Work ◽  
Co2 Concentration ◽  
Office Buildings ◽  
Indoor Climate ◽  
Office Rooms ◽  
Air Conditioning Systems

The presented research work is aimed at investigation of the influence of indoor environmental conditions on employees in office buildings. Monitoring of carbon dioxide, temperature, relative humidity and pulse, as well as subjective evaluation, was carried out in three office rooms where air conditioning systems ensured the required amount of fresh air. Investigation showed that in two offices (A and B), the amount of fresh air did not comply with EN 15251:2017. The concentration of CO2 in office A was above 1000 ppm for 72% of the total length of stay. Respondents confirmed fatigue and headaches. In offices A and B, where CO2 concentration was around 1000 ppm, people with a weight of up to 70 kg experienced a significant increase in air temperature as well as odor. Persons with weight higher than 75 kg experienced a slight decrease in air quality. In office C, where CO2 concentration was around 800 ppm, respondents reported a slight decrease in air quality. According to pulse monitoring, it can be stated that in an office where there is an insufficient supply of fresh air, the pulse of a person falls or only slightly rises. A decrease in pulses may indicate the attenuation or stunning of people caused by poor air quality.

Study on Energy Saving from Intermittent Operation of Air-Conditioning System

2014 ◽  
Vol 672-674 ◽  
pp. 542-545 ◽  
Author(s):  
Hong Wen Jin
Keyword(s):  
Time Delay ◽  
Energy Saving ◽  
Heat Balance ◽  
Air Conditioning ◽  
System Operation ◽  
Air Conditioning System ◽  
Intermittent Operation

According to the principles of air and heat balance and aiming at air-conditioning load time delay mechanism, the boot time for air-conditioning system operation is controlled to satisfy the demand of air-conditioned environment without wasting energy [1].

The Application of Radiant Concrete Ceiling’s Heat Storage in Wu Han, China

2011 ◽  
Vol 374-377 ◽  
pp. 847-850
Author(s):  
Na Li ◽  
Dong Li Yuan
Keyword(s):  
Control System ◽  
Cost Saving ◽  
Energy Saving ◽  
Temperature Control ◽  
Air Conditioning ◽  
Heat Storage ◽  
Operating Cost ◽  
Electricity Price ◽  
Temperature Control System ◽  
Intermittent Operation

In temperature and humidity independent control system, although the heat storage capability of the concrete ceiling is not big, for energy-saving building with small air-conditioning load, its potential of operating cost’ saving is not negligible. Based on an energy-saving dwelling building’s typical room in Wu Han, China, this paper dynamically analyzes the room’s load and concrete ceiling’s radiating capability, get conclusion that: according to the peak-valley electricity price and reasonable intermittent operation strategy, the temperature control system can save cost by 16.6% in summer, 27.3% in winter.

Thermal performance optimization of building floors under air-conditioning intermittent operation by numerical simulation

2019 ◽  
Vol 43 (2) ◽  
pp. 99-120 ◽  
Author(s):  
Xi Meng ◽  
Junfei Du ◽  
Yating Wang ◽  
Yanna Gao
Keyword(s):  
Reinforced Concrete ◽  
Thermal Performance ◽  
Performance Optimization ◽  
Air Conditioning ◽  
Expanded Polystyrene ◽  
Transfer Model ◽  
Cooling Load ◽  
Concrete Floor ◽  
Intermittent Operation ◽  
Air Space

Under air-conditioning intermittent operation, there may be the large difference of air temperatures in two adjacent rooms due to different operation behavior, and thereby, interior envelops may cause great heat loss. Under this condition, floors may become the most vulnerable spot of the room heat preservation due to their large proportion in interior envelops and poor thermal insulation. To optimize the thermal performance of floors, three floor models were built to compare their thermal performance characteristics under air-conditioning intermittent operation, while a heat transfer model was built by the finite volume method and verified by experimental data. The results showed that an expanded polystyrene layer located close to the upper surface can improve the thermal performance of the bottom floor, while the continuous integration of an air space ceiling placed close to the lower surface can improve the thermal performance of the top floor obviously. The daily cooling load formed by the cast-in-place-reinforced concrete floor integrated with the expanded polystyrene layer and the air space ceiling can reduce the daily cooling load by 53.27% and 47.00%, compared with the cast-in-place-reinforced concrete floor and the cast-in-place-reinforced concrete floor only integrated with the expanded polystyrene layer.

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