Ventilative Cooling as a Solution for Highly Insulated Buildings in Cold Climate

Alonso, María Justo; Mathisen, Hans Martin; Collins, Rose C.

doi:10.1016/j.egypro.2015.11.707

Cited by 10 publications

(10 citation statements)

References 5 publications

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“…One of the important sustainable design tasks is to use the simplest, passive possibilities to protect the building against overheating [1,11]. The protection methods should be adapted to the current needs and the individual structure of the heat balance of the considered building [32]. The simplest measure, but unfortunately rarely used, is rational glazing area.…”

Section: Discussionmentioning

confidence: 99%

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On the Role of External Walls in the Reduction of Energy Demand and the Mitigation of Human Thermal Discomfort

Kisilewicz

2019

Sustainability

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The structure and thermal properties of external walls affect both the thermal conditions inside the building and the energy demand. This applies to the energy requirement for heating as well as cooling. While the relationship between thermal insulation and heating is well-known, the effect of thermal insulation on overheating is not evident. One can find opinions that thick thermal insulation creates a “thermos effect” and significantly deteriorates the comfort conditions during the summer. In order to prove these statements, an office room with south-oriented glazing and a high thermal load from equipment was simulated by means of the Energy Plus program. The reference variant was a two-layer wall made from ceramic blocks and a 10 cm layer of thermal insulation. The duration of overheating in the investigated intensively used office space without window shading was approximately 26 to 29 days per year, depending on the expected comfort acceptance range, while in the case of the not insulated wall, it would be shorter by over 3 days. Increasing the thickness of the thermal insulation layer by up to 30 cm extended the overheating period by 4% to 9%. In relation to the whole simulation period, covering four summer months, this means approximately two extra days of discomfort. The effects of various passive methods of protecting buildings against overheating were also investigated. The use of night ventilation in this facility enables reducing the unfavorable conditions by as much as 31%, or up to 46% of the initial period of overheating. The change of the thermal inertia of a building by replacing the ceramic layer with heavy structural concrete allows a further reduction of the overheating duration by 8% to 9%. When the most effective ways of overheating protection are applied, such as night cooling, even a significant thickening of insulation no longer has any impact on its duration. The results shown above are obviously related to the adopted assumptions. However, on the basis of the conducted analyses, it is possible to reduce concerns relating to excessive insulating the building with respect to overheating. Having an optimal window area with nighttime cooling of buildings, window shading, and the inertial benefits associated with a massive construction are the most important and effective measures of protection against overheating. Efficient thermal insulation of the walls does not conflict with the thermal comfort conditions.

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Section: Discussionmentioning

confidence: 99%

“…It was assumed that the air exchange rate was constant at 5 h −1 for each day and night. Alonso et al [32] proved that exhaust ventilation is the best strategy for summer. Simulation results of this case are presented in Figure 7.…”

Section: Night Cooling and Enhanced Thermal Capacitymentioning

confidence: 99%

On the Role of External Walls in the Reduction of Energy Demand and the Mitigation of Human Thermal Discomfort

Kisilewicz

2019

Sustainability

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“…Ventilative cooling refers to the use of ventilation air in order to reduce or eliminate the need for mechanical cooling. Ventilative cooling can be applied through both mechanical (by fans) and natural (by openings and use of thermal gradients) ventilation strategies, as well as a combination of both [ 11 ]. Free cooling by ventilation is one of the most effective techniques for cooling since the ambient cool air is directly used to reduce the inside air temperature.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objectives Optimization of Ventilation Controllers for Passive Cooling in Residential Buildings

Grygierek

Ferdyn-Grygierek

2018

Sensors

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An inappropriate indoor climate, mostly indoor temperature, may cause occupants’ discomfort. There are a great number of air conditioning systems that make it possible to maintain the required thermal comfort. Their installation, however, involves high investment costs and high energy demand. The study analyses the possibilities of limiting too high a temperature in residential buildings using passive cooling by means of ventilation with ambient cool air. A fuzzy logic controller whose aim is to control mechanical ventilation has been proposed and optimized. In order to optimize the controller, the modified Multiobjective Evolutionary Algorithm, based on the Strength Pareto Evolutionary Algorithm, has been adopted. The optimization algorithm has been implemented in MATLAB®, which is coupled by MLE+ with EnergyPlus for performing dynamic co-simulation between the programs. The example of a single detached building shows that the occupants’ thermal comfort in a transitional climate may improve significantly owing to mechanical ventilation controlled by the suggested fuzzy logic controller. When the system is connected to the traditional cooling system, it may further bring about a decrease in cooling demand.

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“…Within the current framework, the concept of a winter garden could be defined as a building within or without other premises, wherein plants regenerate air by trapping CO 2 and evolving oxygen (Toledo et al 2016). At the same time, the premises may be connected with the "winter garden" by recirculating ventilation system (Alonso et al 2015). This building may serve as capacity filled with plants, which are capable of an active photosynthesis (Paevere et al 2008).…”

Section: Methodsmentioning

confidence: 99%

Gaseous and Thermal Analysis of Winter Garden Used for Air Regeneration Throughout Office Buildings

Rymarov

Parfenteva

Valančius

et al. 2018

Journal of Environmental Engineering and Landscape Management

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Ecological problems are inherent in the issue of air quality in the buildings. The main goal thus becomes the creation of indoor clime, where concentration of the detrimental impurities, such as carbon dioxide, would not exceed established norms. Thus, it is proposed to develop an alternative system of ventilation, which would ensure necessary indoor climate without outside air use. In order to decrease the levels of it inside the buildings, it is suggested to use a winter garden with much greenery, so that the air would be regenerated since the carbon dioxide would be absorbed and oxygen would be evolved. The current work reveals the study results of thermal, air and gas conditions in a winter garden upon the office building. The proposed methodology based on the ANSYS-CFX software, ensures a successful calculation of heating and aerial regimes within buildings that might differ in accordance with various engineering practices.

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Ventilative Cooling as a Solution for Highly Insulated Buildings in Cold Climate

Cited by 10 publications

References 5 publications

On the Role of External Walls in the Reduction of Energy Demand and the Mitigation of Human Thermal Discomfort

On the Role of External Walls in the Reduction of Energy Demand and the Mitigation of Human Thermal Discomfort

Multi-Objectives Optimization of Ventilation Controllers for Passive Cooling in Residential Buildings

Gaseous and Thermal Analysis of Winter Garden Used for Air Regeneration Throughout Office Buildings

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