Details on Intermittent Heating Operation
Information about Intermittent heating operation section.
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Additional heat-up capacity
Use the radio buttons here to select whether your project contains intermittent or rarely heated rooms and how you want to manage the settings for these.
None: Your project contains no intermittent or rarely heated rooms. All fields are deactivated, no settings can be made at project or room level.
Globally: Your project contains intermittent or rarely heated rooms and the settings for these rooms are made at project level at this point. Different specifications can be set on room level if the heating capacity in the room is changed to roomwise.
Roomwise: Your project contains interrupted or rarely heated rooms and the settings for these rooms can be made at project level, at the building unit level and in the room itself.
at building unit level: Your project contains interrupted or rarely heated rooms and the settings for these rooms can be made both at project level and at building unit level.
Default vaue
Activated: You can manually enter the transmission heat loss coefficient and the net building volume.
Deactivated: The values for the transmission heat loss coefficient and the net building volume are determined from the heat load.
Detail settings
Building mass: The setting from the general heating load data section is adopted.
Unheated interval: Period during which the room is not heated.
Target/minimum value: The target or minimum temperature that the heating controller will not fall below.
Reheating time: Time in which the room should be heated up to the desired temperature.
Air change rate Heat reduction: The air change rate during the unheated interval.
Air change rate Heating up: The air change rate in the heating phase.
Air change rate: The air change rate during the unheated interval. This text field is only active if you calculate according to ISSO 53. With windows and doors closed and the system switched off, an air change rate of 0.1 can be assumed.
Temperature drop: From the data entered, a corresponding temperature drop in the subsidence phase is determined and suggested according to the standard. If the suggested value is below the target value or minimum temperature during the subsidence phase, the system automatically calculates using the target value or minimum temperature.
Alternatively, you can also enter a freely selected value. By clicking 
the suggested value is entered again.
Temperature drop: Manually entered difference between target and minimum temperature of a room in the unheated interval. For ISSO 51, a click on the question mark opens a graphic to help you choose the right entry. For ISSO 53, the field is only active if free cooling is deactivated.
Reheat factor: The heating factor is automatically determined and suggested based on the actual possible temperature drop.