Day Economy

Day Economy.

The day economy function is a popular energy saving feature in many heating systems.  Heating plant has always had a need to be seasonally adjusted for control.  This was usually done on a calendar basis - switch off in May and back on in October.  What happens when there is a period of cold weather in July or an unseasonally 21°C in March?

The day economy function will switch the heating off automatically when the outside temperature rises above a setpoint - usually around 17°C.  The function would be cancelled when the temperature has fallen to around 12°C.

The principle is that internal gains in a building will offset heat requireemnt.  For this reason the value will differ for different types of building and different usage.  For instance an office with a high gain from equipment will require a lower setpoint than an old peoples home.