Study of Air-Conditioning Load: Comparison of Steel and RC Residence Units

Wang, Yupeng; Fukuda, Hiroatsu; Kuma, Yuko; Ozaki, Akihito

doi:10.3130/jaabe.9.571

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…Thermal capacity of prefabricated office structure frame is obvious lower than that of RC or S building [14,15,16]. Due to this specific situation of prefabricated office, outside air temperature has a manifest negative effect on indoor environment.…”

Section: Annual Ac Load Of Normal Prefabricated Officementioning

confidence: 99%

“…Relation between ceiling-surface temperature and heating load (5-6 Feb.) Figure 6. Relation between ceiling-surface temperature and cooling load (15)(16) In the results of 2 days in summer (Figure 6), roof surface temperature of prefabricated office with roof ① is roughly 2OC higher than outdoor air temperature, it's higher than that with the other 3 roof styles. Surface temperature of roof ③ is more than 2OC lower, and that of roof ② is about 1OC lower than outdoor air temperature.…”

Section: The Effect Of Roof Insulationmentioning

confidence: 99%

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Timber Chips as the Insulation Material for Prefabricated Office Building Environmental Simulation

Wang¹,

Fukuda²

2017

dteees

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Abstract.In this research, we demonstrated the effectiveness of a roof insulation method for prefabricated offices; which is made of vinyl packed timber chips, in order to reduce the airconditioning loads (hereinafter referred to as AC loads) and promote the indoor thermal comfort. By the comparison between the impacts of 4 different roof types on prefabricated offices, the advantages of the new roof insulation method was revealed. The dynamic simulation software THERB is used to evaluate the AC load and indoor thermal comfort (surface temperature, air temperature). The treatment of scrap timbers that discarded from building construction progress is a problem. The assessing of provided new roof insulation method with timber chips could absolutely contribute to the popularization of timber chips, subsequently reduce environmental load in building construction process. On the other hand, since prefabricated offices has lower thermal-storage capacity and less air tight than RC or S structured buildings, the AC loads consumption and indoor thermal comfort exacerbation in prefabricated offices is more serious. Especially in summer, large amount of solar energy absorption from the roof raises the indoor air temperature and increases cooling load significantly. This research contributes to environmental design for prefabricated office, and the development of wood chips reusing possibility.

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Section: Annual Ac Load Of Normal Prefabricated Officementioning

confidence: 99%

Section: The Effect Of Roof Insulationmentioning

confidence: 99%

Timber Chips as the Insulation Material for Prefabricated Office Building Environmental Simulation

Wang¹,

Fukuda²

2017

dteees

Self Cite

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“…The thermal capacity of prefabricated office structure frames is obviously lower than that of Reinforced concrete (RC) or Steel (S) buildings [19][20][21]. Due to the specific situation of prefabricated offices, outside air temperature manifests a negative effect on the indoor environment.…”

Section: Annual Ac Load Of Normal Prefabricated Officementioning

confidence: 99%

Timber Chips as the Insulation Material for Energy Saving in Prefabricated Offices

Wang

Fukuda

2016

Sustainability

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This research demonstrates the feasibility of a roof insulation method for prefabricated offices that uses vinyl packed timber chips to reduce air conditioning loads (hereinafter referred to as AC loads) and which also improves indoor thermal comfort. The advantages of the new roof insulation method were revealed through comparing the impacts of four roof types on prefabricated offices. The AC load and indoor thermal comfort (surface temperature and air temperature) were evaluated. The disposal of scrap timber discarded from building construction projects is costing money, and is also a waste of natural resources. The assessment of a new roof insulation method with timber chips demonstrates the advanced usage of timber chips, reducing the environmental load in the building construction process. On the other hand, since prefabricated offices have lower thermal storage capacities and are less airtight than RC (reinforced concrete) or S (steel) structured buildings, the AC load consumption and indoor thermal comfort exacerbation in prefabricated offices is more serious. Especially in summer, a large amount of solar energy absorption from the roof raises the indoor air temperature and significantly increases the cooling load. This research contributes to the environmental design for prefabricated offices, and develops a method for the reuse of wood chips.

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“…These acts, however, were not proposed for improving energy saving levels at residential units. Therefore, it is necessary to clarify the properties of various insulation styles in apartment units and the mechanism of effects from insulation on thermal comfort and energy use [2]. Meanwhile, it shows that building envelopes with high insulation properties should be introduced to the building exterior walls, floor slabs and the other components of the building envelope [3].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Insulation Styles on the Building Energy Consumption and Indoor Thermal Comfort of Multi-Family Residences

Wang

Fukuda

2019

Sustainability

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The properties of building envelopes significantly affect indoor building energy consumption, indoor thermal comfort, and building durability. In the current standards for Japanese residential energy efficiency, insulation placement is not well regulated. Meanwhile, it is common in Japan to use air-conditioning intermittently, rather than having the units operate continuously. Therefore, considering specific Japanese lifestyles, we investigated insulation performance. In this research, we: (1) developed the interior insulation to include insulation on walls, ceilings and floors of building units (all of the interior surfaces) to achieve building energy savings by avoiding heat loss through thermal bridges; (2) discussed and demonstrated the effects of high heat capacitance for each of the building components and the thermal bridge by conducting building environmental simulations; (3) conducted simulations in seven cities in Japan and discussed the applicability of these different weather conditions; and (4) compared temperature distributions to investigate differences in indoor comfort with partial heating on winter nights. We demonstrated the energy saving and thermal comfort advantages of interior insulation. This research provides an innovative insulation style based on Japanese lifestyles that contributes to new energy-saving standards and formulations.

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Study of Air-Conditioning Load: Comparison of Steel and RC Residence Units

Cited by 5 publications

References 1 publication

Timber Chips as the Insulation Material for Prefabricated Office Building Environmental Simulation

Timber Chips as the Insulation Material for Prefabricated Office Building Environmental Simulation

Timber Chips as the Insulation Material for Energy Saving in Prefabricated Offices

The Influence of Insulation Styles on the Building Energy Consumption and Indoor Thermal Comfort of Multi-Family Residences

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