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Knowledgebase : HVAC
There are 3 ways of modelling HVAC systems in DesignBuilder: 1. SIMPLE in which the system is defined using basic HVAC data descriptions and heating and cooling loads are calculated using the idealised EnergyPlus "Ideal Loads" system. Heating and co...
Heating/cooling setback temperaturesĀ can be used to keep occupied spaces conditioned to avoid frost and/or overheating during periods when the building is not occupied. The setpoint andĀ setback temperatures you define on the Activity tab under the Environ...
On some computers you may get the 'Error expanding HVAC template' error message. In this case you may be able to get round the problem by changing the Shell option to "5-Basic" on the Developer tab of the Program options dialog.
DesignBuilder calculates fan energy consumption data and displays it at building level on the Simulation screen. Fan energy is calculated differently depending on the model options selected: 1. Simple HVAC fan energy algorithm depends on the "Auxi...
It is quite straightforward to set up a simulation to calculate loads due to humidity control using compact HVAC: Switch on Compact HVAC model option Load the "Packaged direct expansion" HVAC templateSwitch on humidification and dehumidification...
First to define the system. Concrete core heating/cooling (often also called "concrete core activation"), is where warm/cool air is passed through holes within concrete slabs to heat the building fabric directly, before supplying the air into the occupied...
It is possible to model freezer zones in DesignBuilder, but it is important to ensure that the temperature of the supply air is set to a very low value to cool the air below zero. If you are using Simple HVAC then take these steps: - Reduce the cooling...
This is known behaviour for EnergyPlus AHU-based HVAC template systems with fixed outside fresh air control including VAV, CAV and Unitary multizone. The reason for the slight differences in zone fresh air from the values requested for individual zones is...
Although CIBSE state that they do not endorse any particular HVAC design or analysis software tools, they do state that dynamic thermal modelling software such as DesignBuilder is suitable for both local and central HVAC plant sizing. See Figure 5.2, Sect...
The Zone Sensible Heating is the heating effect of the HVAC system action on the zone heat balance, in particular the heating effect of introducing air that is warmer than the zone air. Likewise Zone Sensible Cooling is the cooling effect of the HVAC syst...
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DesignBuilder does not use the fuel consumption values generated by EnergyPlus but instead calculates fuel consumption from coil loads and the ideal system loads used in Simple HVAC using heating and cooling CoP values entered on the DesignBuilder HVAC ta...
One common cause of under sized heating systems when working with Compact HVAC is incorrectly defined schedules. Schedules used to define the operation of equipment, lighting etc should normally be switched off for heating design. A correct form for a s...