The method of creating an airtight building envelope in order to separate a comfortable indoor environment from any external extremes.
ACH stands for Air Changes per Hour.
For example: if a building's internal volume is 500m3 and a test indicates 1,000m3 of infiltration air leakage in an hour. It would be said to have an airtightness of 2 air changes per hour (2 ACH). Meaning that the space is losing two times its internal volume worth of air every hour.
|Blower Door Testing (BDT)||
A Blower Door Test is a method used to identify and quantify air leakages in a building envelope.
|Centralised (Ducted) Unit||
Centralised (Ducted) ERV systems consist of a single unit which moves large volumes of air throughout the building from a single main unit. The necessity of ducting for the air flow makes these systems most appropriate for new houses or existing houses with adequate space available in the roof or floor cavities for duct installation.
|Decentralised (Non-Ducted) Unit||
Decentralised (Non-Ducted) ERV systems are standalone units which provide high-efficiency and quiet operation. As these units require no ducting, they are ideal for retrofit installation into existing buildings, particularly when there is insufficient space to install a complex ducting system or large centralised unit.
|Dew-Point Analysis and Modelling||
The computational process used for regulating the point at which condensation is expected to occur within a building environment.
|Energy Recovery Ventilation (ERV)||
Energy Recovery Ventilation (ERV) units are able to exchange both sensible heat (Temperature) and latent heat (Moisture). The ability to regulate moisture as well as temperature makes ERV systems better at maintaining higher levels of air quality than the less advanced Heat Recovery Ventilation (HRV) systems which are only capable of regulating temperature.
|Fluid Dynamic Modelling||
The computational process of designing, simulating and evaluating fluid flow problems and solutions.Namely, the process we use to design the perfect ventilation system for your building.
|Heat Recovery Ventilation (HRV)||
Heat Recovery Ventilation (HRV) units recover sensible heat i.e. Temperature from hot or cold air and uses it to preheat or precool air which improves energy efficiency.
|Moisture Vapour Transmission Rate (MVTR)||
MVTR is a measure of a materials resistance to water vapour diffusion.It is measured in MNs/g.Efficacy:In general, the LOWER the MVTR value, the LOWER the resistance to water vapour transmission.A low MVTR value indicates a material that readily allows the passage of water vapour.
An R-value is a measure of a material's thermal resistance.It is measured in m2K/W.Efficacy:In general, the HIGHER the R-value, the HIGHER the level of thermal resistance, and the less heat will be transferred through the material.Note: Generally, an R-value is the inverse of the U-value (R=1/U)
Structural Thermo-breaking refers to the elimination of thermal bridges in structural connections.
|SHGC (Solar Heat Gain Coefficient)||
The measure of how much energy (specifically solar heat) from the sun passes through a window.
|Solar Heat Gain Control||
Solar Heat Gain Control refers to various methods of regulating the incoming solar heat from the sun.
The term thermal bridge is used to refer to any structure, design or material that acts as a conductor of heat between two different temperature differentials (usually, between the inside of a building's thermal envelope to the outside).Common examples include: - a concrete slab with a cantilever balcony (where the slab acts as thermal bridge - or a thermodynamic fin) - a steel I-beam that passes through the thermal envelope.
The thermal envelope is the boundary between the regulated living space and the external environment (for insulation and airtightness purposes).
Note: the thermal envelope often differs to the external building envelope.
|Thermal Break or Thermal Barrier||
An element or point of low thermal conductivity, which massively reduces the flow of thermal energy between conductive materials.
The U-value is the overall heat transfer coefficient, and is a measure of the rate of heat transfer through a material.
Note: Generally, a U-value is the inverse of the R-value (U=1/R).