Influence of different outdoor design conditions on design cooling load and design capacities of air conditioning equipments

Aktacir, Mehmet Azmi; Büyükalaca, Orhan; Bulut, Hüsamettin; Yılmaz, Tuncay

doi:10.1016/j.enconman.2007.10.021

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…Climate, socio-cultural setup, economy, building materials and available technologies are the main factors that greatly affect the building architecture and its sustainability (Sayigh & Marafia, 1998). Degree-days are versatile climatic indicator, used in building design and operation that estimates the energy consumption and consequently carbon emissions due to space heating and cooling (Aktacir, Büyükalaca, Bulut, & Yilmaz, 2008;Mourshed, 2012). It is a widely used method because it captures both the extremity and duration of ambient temperatures (CIBSE, 2006).…”

Section: Introductionmentioning

confidence: 99%

Estimation of degree-days for different climatic zones of North-East India

Borah

Singh

Mahapatra

2015

Sustainable Cities and Society

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Section: Introductionmentioning

confidence: 99%

Estimation of degree-days for different climatic zones of North-East India

Borah

Singh

Mahapatra

2015

Sustainable Cities and Society

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“…However, it is most important to note that the assessment of climate change impacts on energy consumption cannot be well used to improve energy efficiency in practice by building designers or professionals during building construction (Cao et al, 2017). Especially, the capacity designs of heating, ventilation and air-conditioning systems (HVAC) dominantly depend on the outdoor design conditions (i.e., design of meteorological parameters) that can be used for load calculation and equipment selection of HVAC (Aktacir et al, 2008;Cao et al, 2017;Xu et al, 2014). How to obtain accurate outdoor design conditions reflecting local climatic conditions is very important for energy efficiency of buildings because the result of incorrect selection of outdoor meteorological conditions can be dramatic because of energy and comfort (Aktacir et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Impacts of temperature and humidity changes on air‐conditioning design load under the climate change conditions in different climate zones of China

Cao

Wang

et al. 2021

Meteorological Applications

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Meteorological parameters, as the important basis for improving building energy efficiency, will show apparent changes under climate change conditions. In this study, outdoor design temperature and humidity for airconditioning system in 12 cities, representing major climatic zones of China, were analysed to determine the impacts of temperature and humidity on the design load of air-conditioning system. The results showed that outdoor design temperature largely increased during the last few decades and relative humidity apparently decreased except for two cities belonging to the severe cold and hot summer and cold winter climate zones. The increase in temperature and decrease in humidity have made obvious changes in the design load of airconditioning system. The design loads for cooling increased 1.8%-10% in these selected cities during 1991-2017 compared with 1961-1990. By contrast, the design loads for dehumidification decreased 0.8%-7% in 1991-2017 relative to . When the cooling and dehumidification were considered together, the design loads changed from À1.5% to 4.1% in the two periods, depending on cities or climate zones. These results demonstrated that, under the condition of climate change, the combined changes of humidity and temperature rather than temperature alone should be fully considered to determine the design capacity of air-conditioning system, especially for temperature and humidity independent control (THIC) air-conditioning system, to save energy and improve indoor comfort.

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“…Under current engineering practice, to design and select a properly sized air-conditioning system, the peak or maximum load of buildings are computed based on a given indoor and prevailing outdoor design condition. 12 A safety factor is assigned to the design cooling load when determining the capacity of the cooling system, considering the future extension, uncertainties/assumptions in the preliminary design stage and potential cooling loss. 13,14 However, this method may often overestimate the actual cooling load as indicated in previous studies, 15,16 due to the neglect of uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty-based robust optimal design of cleanroom air-conditioning systems considering life-cycle performance

Zhuang

Wang

2020

Indoor and Built Environment

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Strict and simultaneous space temperature and humidity controls are often required in many applications, such as hospitals, laboratories, cleanrooms for pharmaceutical and semiconductor manufacturing. The energy intensity in such applications can be up to 100 times than typical office buildings, mainly due to the improper system design and control. Although some uncertainty-based design methods have been developed for air-conditioning systems, most of the existing systems are designed based on a certain ventilation mode while neglecting the life-cycle performance of the components. This study, therefore, proposes a robust optimal design method for cleanroom air-conditioning systems, considering the uncertainties in design parameters for inputs and operation strategies as well as the life-cycle performance of components. An adaptive full-range decoupled ventilation strategy, which incorporated five operation modes, was adopted in the design optimization. Two maintenance modes were adopted and compared to consider the flexibility of maintenance. The proposed design method has been implemented and validated in the design optimization of an existing air-conditioning system. The results showed that, compared with the conventional design, up to 54% reduction of life-cycle costs and superior satisfaction of services could be achieved by using the proposed method.

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Influence of different outdoor design conditions on design cooling load and design capacities of air conditioning equipments

Cited by 19 publications

References 7 publications

Estimation of degree-days for different climatic zones of North-East India

Estimation of degree-days for different climatic zones of North-East India

Impacts of temperature and humidity changes on air‐conditioning design load under the climate change conditions in different climate zones of China

Uncertainty-based robust optimal design of cleanroom air-conditioning systems considering life-cycle performance

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