Evaluating Thermal Environments by Using an Air-Conditioning Energy-Saving Mechanism

2012 ◽  
Author(s):  
Nguyen Anh Tuan ◽  
K. D. Huang
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Energy Use ◽  
Thermal Environment ◽  
Minimum Energy ◽  
Outlet Port ◽  
Thermal Environments ◽  
Environment Control ◽  
Port Opening ◽  
Occupied Zone

In a highly developed living, people are always looking for a comfortable indoor environment with minimum energy use. Individual air-conditioning system (IACS) can create an individual thermal environment control in a workroom which can contribute to save air-conditioning energy. In this study, we analyze the airflow circulation cell of the IACS with varied outlet port opening and outlet port position dimensions using the computational fluid dynamics (CFD) technique. We created an IACS, two workstations, lightings, and a cabinet in a 3-dimensional room. The fluid was assumed to be Newtonian, unsteady, and incompressible. A Bossinesq approximation was determined in order to consider the buoyancy effect. We examined the effects of the outlet port opening and outlet port position on airflow circulation establishing process. Air temperatures along the various midline of the occupied zone were predicted and compared for a range of outlet port opening and outlet port position by using non-dimensional form. We also showed the occupied zone temperature at various planes in the workroom. Results will indicate the suitable outlet port opening and outlet port position for maintaining individual satisfied occupants’ requirements and improving energy saving potential.

Individual Thermal Environments of Building with a Novel Air-Conditioning Energy-Saving Equipment

2013 ◽  
Vol 368-370 ◽  
pp. 645-648
Author(s):  
Nguyen Anh Tuan ◽  
Wu Chieh Wu ◽  
Huy Bich Nguyen
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Air Conditioning System ◽  
Outlet Port ◽  
3 Dimensional ◽  
Thermal Environments ◽  
Energy Saving Potential ◽  
Environment Control ◽  
Port Opening

Individual air-conditioning system (IACS) can create an individual thermal environment control in a workroom which can contribute to save air-conditioning energy. In this study, we analyze the airflow circulation cell of the IACS with varied outlet port opening dimensions using the computational fluid dynamics (CFD) technique. We created an IACS, two workstations, lightings, and a cabinet in a 3-dimensional room. The fluid was assumed to be Newtonian, unsteady, and incompressible. We examined the effects of the outlet port opening on airflow circulation establishing process. Results will indicate the suitable outlet port opening for maintaining individual satisfied occupants’ requirements and improving energy saving potential.

scholarly journals Field Study on Energy-Saving Behaviour and Patterns of Air-Conditioning Use in a Condominium

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8572
Author(s):  
Kazui Yoshida ◽  
Hom B. Rijal ◽  
Kazuaki Bogaki ◽  
Ayako Mikami ◽  
Hiroto Abe
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Energy Use ◽  
Thermal Environment ◽  
Residential Energy ◽  
Indoor Thermal Environment ◽  
Energy Management Systems ◽  
Home Energy Management ◽  
Questionnaire Surveys ◽  
Floor Heating

In the international movement to combat the threat of climate change, the timely implementation of residential energy-saving practises is becoming an urgent issue. Because the number of apartments is increasing, we analysed data from home energy management systems (HEMSs) and data from questionnaire surveys of 309 households in a condominium. We focused on the seasonal variation in air-conditioning (AC) use in living-dining rooms to determine the tendency of energy use for heating/cooling related to the characteristics of flats, the profiles of residents, and energy-saving behaviours. In winter, 80% of residents mainly used gas floor heating rather than AC and 24% did not use AC in winter. In households where someone stays home for long hours, they prefer gas floor heating rather than AC in winter. These households also tend to engage in energy-saving behaviours to adjust the indoor thermal environment. There are several types of energy-saving lifestyles; therefore, effective energy-saving measures should be considered for both energy efficiency and the thermal comfort of residents.

scholarly journals The thermal environment required by patients and nursing staff in general wards

1982 ◽  
Vol 1 (3) ◽  
pp. 145-155
Author(s):  
J. D. Wentzel
Keyword(s):  
Nursing Staff ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Comfort Index ◽  
Thermal Environments ◽  
Operating Theatres ◽  
Environmental Requirements ◽  
General Wards ◽  
Open Question ◽  
Comfort Indices

Often it is accepted and believed that all areas in hospitals should be air-conditioned. In view of the current high cost of installing and operating air-conditioning units, an objective study of the real needs in this regard was proposed. Whereas the need for air-conditioning in operating theatres, intensive care units and other rather specialised areas is accepted in principle, it is an open question whether all rooms need such treatment. The question could be answered only after a thorough investigation into the actual thermal environmental requirements of patients and nursing staff in general wards. Some 1 300 patients and 60 nurses were interviewed in six local hospitals and their subjective reactions to the various thermal environments to which they were exposed were analysed in terms of three different comfort indices. Air temperature was found to be a good comfort index when the humidity is relatively low.

scholarly journals Climate Compensation and Indoor Temperature Optimal Measuring Point Energy Saving Control in VAV Air-Conditioning System

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4398 ◽  
Author(s):  
Xiuying Yan ◽  
Cong Liu ◽  
Meili Li ◽  
Ating Hou ◽  
Kaixing Fan ◽  
...  
Keyword(s):  
Energy Saving ◽  
Air Temperature ◽  
Control Strategy ◽  
Air Conditioning ◽  
Compensation Scheme ◽  
Indoor Temperature ◽  
Air Conditioning System ◽  
Measuring Point ◽  
Temperature Measuring ◽  
Environment Control

Temperature measuring point is the key to room environment control. Temperature measuring points and climate changes are directly related to the room control effect. It is of great theoretical and practical significance to study the temperature measuring points and control strategy based on climate compensation. In this study, first, the climate compensation concept in a heating system was introduced into a variable air volume (VAV) air-conditioning system. The heating load was modeled as a function of supply air temperature by analyzing the heat exchange. Based on each control link of subsystems, a climate compensation scheme is proposed to determine the optimal set-point of the supply air temperature. At the same time, a layout of multiple temperature measuring points of an air-conditioned room was studied. Furthermore, the optimal indoor temperature measuring point was determined using an adaptive weighted fusion method. Finally, simulation results show that the proposed method has better control effects on indoor temperature adjustment compared with the traditional method. The optimal supply air temperature in summer and winter was determined according to the proposed climate compensation scheme, and the supply air temperature was controlled using an improved single-neuron adaptive control strategy. Experimental results show that the maximum energy saving can reach up to 35.5% in winter and 6.1% in summer.

scholarly journals BUDGET HOTEL DENGAN PENDEKATAN ARSITEKTUR HEMAT ENERGI DI COLOMADU, KARANGANYAR

Arsitektura ◽  
2017 ◽  
Vol 14 (1) ◽  
Author(s):  
Yusnia Satyawati Hardiningtyas ◽  
Bonifasius Heru Santosa Soemarno ◽  
Amin Sumadyo
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Energy Use ◽  
Building Design ◽  
Simulation System ◽  
Building Simulation ◽  
Air Conditioning System ◽  
Artificial Lighting ◽  
International Airport ◽  
Strategic Location

<em>Colomadu is a locality of Karanganyar Regency located quite far apart from the Karanganyar Regency (exclave). Existing issues in the region of Colomadu becoming the background of planning and designing Budget Hotel in Colomadu with Energy Saving Architecture approach, as for instances, the existence of competition between hotels; a tendency of the tourist to stay in affordable lodgments with comfortable facilities; most of the hotels in Colomadu have not applied the concept of energy saving; as well as the Colomadu area good prospects and strategic location Budget Hotel since it is close to the International Airport of Adi Sumarmo and bounded by regions with capability to support  activities in the Budget Hotel. The problem of the design is how to implement energy saving concept (focus on lighting and air conditioning system) on the building as an effort to minimize the expenses of energy use, but the facilities granted stay comfortable and affordable. The purpose of this design is getting a building design that provides lodging facilities with affordable, comfortable, and apply the concept of energy saving. The method used is the method of designing architecture with the Energy Saving Architecture approach. The results obtained, i.e. the design  Budget Hotel with Energy Saving Architecture approach which is applied to the lighting and air conditioning system, such as determining the position of the openings and performing control of sunlight by providing massive walls, overhang, and secondary skin on the exterior of the building simulated with Autodesk Ecotect Analysis 2011 as well as the use of the roller blind or curtains in interior building, simulation system for Dialux 4.12 artificial lighting, and simple calculations to determine the system of artificial air conditioning (AC).</em>

Sensory and physiological assessment of spatial transient thermal environment changes at a tropical university campus

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nur Dalilah Dahlan ◽  
Amirhosein Ghaffarianhoseini ◽  
Norhaslina Hassan
Keyword(s):  
Energy Efficiency ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Thermal Environment ◽  
Residential Buildings ◽  
University Campus ◽  
Content Type ◽  
Environment Changes ◽  
Thermal Environments ◽  
Transient Thermal

PurposeRecent studies have found that the high demand for air-conditioning usage in tropical countries has affected the thermal adaptability of building occupants to hot weather, and increased building energy consumption. This pilot study aims to investigate the effects of transient thermal environment changes on participants' sensory and physiological responses.Design/methodology/approachThe change of thermal perceptions, skin temperatures and core temperatures when exposed to transient thermal environments (cool-warm-cool) from 10 college-aged female participants during a simulated daily commute by foot to class in a tropical university campus were investigated. Subjective measurements were collected in real-time every 5 min.FindingsThe main finding suggests that participants were acclimatised to cool air-conditioned indoor environments, despite exhibiting significant mean skin temperature differences (p < 0.05). In addition, exposure to uniform air conditioning from 17 to 18°C for 20 min was thermally unacceptable and reduced concentration during given tasks.Research limitations/implicationsThe study focused on thermal comfort conditions in a uniform air-conditioned lecture hall, and the findings may not be applicable for residential and other private building spaces. The distinct temperature difference between indoor and outdoor in the tropical built environment resulted in high dependence on air-conditioning usage. The building occupants' well-being and energy conservation implications of the findings are discussed.Practical implicationsThis study provides the platform for discussion on the dynamics of occupants' comfort level and adopting a more variable thermal environment in tropical spatial transient thermal environments among architects and building management system managers. The findings from this study may contribute to the Malaysian Standards for Energy Efficiency and Use of Renewable Energy for Non-Residential Buildings (MS1525).Originality/valueA knowledge gap in adaptive thermal comfort due to exposure from transient conditions in tropical university campus for energy efficiency revision has been investigated.

scholarly journals Research on the Energy-Saving Design Path of Rural Farmhouses under the Background of Ecological Livability

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jingyuan Shi ◽  
Qiuna Li
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Saving ◽  
Rural Areas ◽  
Urban Areas ◽  
Energy Use ◽  
Thermal Environment ◽  
Clean Energy ◽  
The State ◽  
Indoor And Outdoor

Different from the state of large-scale energy use and concentrated energy conservation in urban areas, the state of energy use and energy conservation in rural areas has its own characteristics and typical problems. Rural areas have been concentrated on the multiple differences in economic, social, and construction characteristics such as mountain and peace dam topography, natural and artificial construction, developed and underdeveloped, rapid urban development, and relatively backward rural development. It has practical problems that need to be solved urgently, such as the “insufficient savings” in the construction of farmhouses and the “insufficient open source” of clean energy applications. The discussion will be conducted from three aspects: the planning and layout design of rural houses in Chongqing, the performance of the enclosure structure of rural houses in key seasons, and the application of renewable clean energy in rural houses. Then put forward is the energy-saving design path of Chongqing farmhouse. It aims to improve the indoor and outdoor thermal environment of farmhouses, saving heating energy consumption in winter and air-conditioning energy consumption in summer and effectively benefit users to use renewable energy such as biogas, straw, and solar energy. Finally, explore the adaptability between the design methods of farmhouses and the local characteristics of Chongqing’s rural areas. In the work of Chongqing Design Going to the Countryside, we create a contemporary farmhouse case that is not only energy-saving but also has good indoor and outdoor space quality. It also provides a reference for the energy-saving design of farmhouses in Chongqing and other regions in China.

scholarly journals ANALISIS KONSUMSI ENERGI LISTRIK UNTUK PENCAPAIAN EFISIENSI ENERGI DI KANTOR DEWAN PERWAKILAN RAKYAT DAERAH KABUPATEN TOJO UNA-UNA

Foristek ◽  
2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Duldes S. Lambey ◽  
Nurhani Amin ◽  
Yulius S. Pirade ◽  
Rudi Santoso
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
House Of Representatives ◽  
Air Conditioning ◽  
Energy Use ◽  
Electricity Consumption ◽  
Mineral Resources ◽  
Electrical Energy ◽  
The Republic ◽  
Consumption Intensity

Audit of Electrical Energy at the Regional House of Representatives of the Tojo Una-Una District is a comprehensive method in examining energy use in a building to find the value of Energy Consumption Intensity (IKE) and Energy Saving Opportunities (PHE) that can be obtained to reduce energy waste so that the consumption of electrical energy is more effective and efficient. The audit of Electrical Energy is carried out according to SNI 03-6196-2000 concerning Energy audit procedures in buildings and the Regulation of the Minister of Energy and Mineral Resources of the Republic of Indonesia Number 13 of 2012 concerning Savings Electricity Consumption. The results of the evaluation of the Energy Consumption Intensity Calculation conducted at the Office of the Regional House of Representatives of Tojo Una-Una District known that there are 16 rooms with the criteria for the Energy Consumption Intensity (IKE) value, namely an office building with air conditioning has efficient enough 8 rooms, wasteful 3 rooms and based on office buildings without Air-conditioning is quite efficient in 3 rooms and wasteful in 2 rooms. The results of Energy Saving Opportunities (PHE) that have been identified by using air conditioning and energy-saving lamps, reducing hours of use without reducing the quality of service in the office can save electricity consumption of 2.339,5165 kWh/month or save electricity bill payments of IDR. 3.379.899,60/month.

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