Heat Loss

Below are some Frequently Asked Questions on the Heat Loss area of the Easy RSS Design Software.

If you have estimated the heat loss for both power and energy and know what flow temperature you wish to use you can skip room by room heat loss calculation and go straight to the design calculations for your chosen technology. 

This will determine what U-Values will be selected for the external wall elements within the heat loss section. 

More modern homes have reduced their levels of ventilation which reduces heat loss and improves energy efficiency. 

An exposed location will mean a property that has no surroundings, or possibly on a hill or close to the sea. When completing heat loss calculations you allow for the design to cope with outside air temperatures affecting the building. 

Intermittent heat is a system that is designed to be on for less than 16 hours per day. For systems on for more than 16 hours per day, this would be classed as continuous heating. 

Thermal bridging occurs when there are gaps between materials and structural surfaces causing “cold spots”. This can have an effect on the heat loss of a building. Within the software you can make an allowance for thermal bridging on individual elements such as external wall when calculating your heat loss. 

A Cob house is a property built out of naturally resources such as earth and soil instead of bricks or timber.

The reason for this is due to slight difference in calculation between them both including the Degree Days. 

The difference within the Air Change factor is for any properties that were built pre-2007 then the standard value you use is 0.33. 

Yes, you have the ability within the specific room information page to input the room volume as a manual input. 

There is always the option to select the “custom” for the fabric type which will allow you to manually input any U-Value you wish. 

A Party Wall is the wall that separates the property you are working on to a neighbouring property. 

You will need to refer to your radiator manufacturer’s catalogue to ensure that the Output at the mean Water to Air Temperature in Watts at 50°C (MW-AT 50°C) is big enough for the design temperature in question.

When using Underfloor Heating (UFH) you would select from the underfloor options that ties in with your chosen installation. When adding a new inventory item, you would put in the description the type of pipe and the pipe spacing distance too.

The correction factor is applied to all heat emitters apart from underfloor heating based on the flow temperature of the heating system.