Overview

This document outlines how Hevacomp Simulator can help with BREEAM assessments.

Method

The Frequency simulation within the Design Simulator program can be used to calculate the hourly results of room temperatures for the entire year. These results can be displayed numerically or shown as a temperature frequency curve. This allows BREEAM section HEA.03 to be fulfilled.

On the 'Display Numeric Results' tab, the below TM52 option can be used to display a summary of overheating criterion 1, 2 and 3.

• Criterion 1 - Hours of Exceedence (He): sets a limit for the number of hours that the operative temperature can exceed the threshold comfort temperature (upper limit of the range of comfort temperature) by one degree or more during the occupied hours of a typical non-heating season (1st May to the 30th September)
  
  
• Criterion 2 - Daily Weighted Exceedence (We): deals with the severity of overheating, which can be as important as its frequency, the level of which is a function of both temperature rise and its duration.
  
  
• Criterion 3 - Upper Limit Temperature (Tupp): sets an absolute maximum daily temperature for a room, beyond which the level of overheating is unacceptable.

BREEAM also requires that Design Simulation software has an associated AM11 Building Energy and Environmental modeling document (CIBSE). The AM11 document pertaining to Bentley Hevacomp Design Simulator can be found here.