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ventilative cooling

Energy use consequences of ventilative cooling in a ZEB residential building

New buildings have to satisfy ever-tightening standards regarding energy efficiency and consumption. This results in higher insulation levels and lower air leakages that reduce heating demands. However, even at moderate outdoor temperatures these buildings are easily warmed up to such a degree that in order to ensure acceptable indoor environment quality, removal of excess heat becomes unavoidable. Use of electric energy related to mechanical cooling is considered incompatible with achieving zero energy buildings (ZEB).

Model Predictive Control (MPC) of hybrid ventilation systems in office buildings with dynamic glass facades

An advanced heat and electricity saving strategy for the regulation of hybrid ventilation systems with automatic night cooling (ventilative cooling), mechanical compressor cooling, natural ventilation and exterior solar shading by the inclusion of MPC (Model Predictive Control) has been developed in this project. The focus is on the optimization of the total energy cost (cost function) as compared to indoor climate requirements and variations in the outdoor climate. During the test period, the test persons could override the automatic control of the natural ventilation and solar shading.

venticool releases new paper: “Overview of provisions for ventilative cooling within 8 European building energy performance regulations”

The venticool platform paper: “Overview of provisions for ventilative cooling within 8 European building energy performance regulations” is now available online. This study aimed to focus on regulatory measures taken or missing regarding ventilative cooling in several countries, which could either inspire developments in other countries or point out specific problems for the market uptake of this technology.

English

Overview of provisions for ventilative cooling within 8 European building energy performance regulations

Ventilative cooling (VC) is a way to cool or to prevent overheating in a building by means of ventilation rates higher than hygienic ventilation rates. To this end, natural (such as windows, vents, louvers) as well mechanical (extract or supply fans) ventilation devices can be used.

Ventilative cooling in national energy performance regulations: Requirements and sensitivity analysis

Higher insulation and air tightness levels of buildings, increase the risk on overheating. Ventilative cooling as passive technique can limit overheating and decrease cooling energy consumption. The national energy performance regulations (EPBD) determine whether, how and under which requirements ventilative cooling can assist to reduce cooling demand and overheating. Therefore, those regulations are a key factor in the market uptake of ventilative cooling. Without a realistic and achievable approach, ventilative cooling will marginally be applied in buildings.

Strategies for exploiting climate potential through ventilative cooling in a renovated historic market

Nearly all retail locations use ventilation and cooling systems to ensure adequate air exchange for health reasons and indoor comfort temperatures. These systems can run for over 2,000 hours per year and we expect that average operating hours will continue to rise across Europe because of the continued trend towards longer opening hours and increased number of opening days. Shopping malls often enclose large open spaces and atria with high solar and internal gains that can drive ventilative cooling.

Indoor climate in a Danish kindergarten built according to active house principles: measured thermal comfort and use of electrical light

The Kindergarten Solhuset is built according to the Active House vision with an emphasize of good daylight conditions and fresh air. The house was completed in 2011, and detailed measurements of the indoor environment have been performed since the completion. The daylight performance is evaluated with daylight factor simulations. The main activity rooms have daylight factors of 7%, while the innermost rooms with only roof windows achieve a high daylight factor of 4%. Electrical light is used frequently in daytime during the winter, but much less frequently during summer.

Summer performance of residential heat recovery ventilation with an air-to-air heat pump cooling system

Increasing airtightness and isolation of residential buildings in today’s climates cause challenging situations for the summer indoor climate. In combination with ventilation for fresh air, it calls for intelligent control of passive cooling when available, and active cooling when needed.

The combination of heat recovery ventilation and an air-to-air heat pump cooling system is a solution to these challenging situations. With the exhaust air heat pump cooling system, heat is transferred from the supply air (which is getting colder) to the exhaust air (which is getting warmer).

Ventilative cooling: Keep cool and lower peak energy demand

6 June 2014 | BUILD UP webinar:”Ventilative cooling: Keep cool and lower peak energy demand”

Ventilative cooling is the use of natural or mechanical ventilation strategies to cool indoor spaces. It can significantly reduce the cooling energy demand in summer or mid-season conditions. Therefore, ventilative cooling is increasingly common in NZEBs.

This BUILD UP Web Seminar addressed:

September 17, 2014 | "Ventilative Cooling: Using the cooling potential of ventilation to reduce energy use in buildings"

This seminar presented work by the IEA EBC Annex 62 which was an international collaborative project on ventilative cooling; it had a four year working phase (2012-2018) and contribution by representatives from 20 universities, research institutes and private industries from 14 different countries from Europe, Japan, China and the US. 

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