Data on the Sequence tab defines the load distribution scheme, heating and cooling calculation sequences and sequential heating and cooling fraction schedules.
Select the load distribution scheme to be used for this HVAC Zone. Choose from the following options:
1-Sequential Load - loads each piece of available equipment sequentially with the full remaining load.
2-Uniform Load - evenly distributes the total load equally among all available components on the equipment list for the current load type.
3-Uniform PLR - evenly distributes the total load among all available components on the equipment list for the current load type at a uniform part load ratio (PLR).
4-Sequential Uniform PLR - determines how many of the available components are required to meet the current load, then distributes the load at a uniform part load ratio (PLR).
Each item of zone heating equipment associated with the current HVAC zone is listed under the Heating Calculation Sequence header. Here you can define the order that each item of equipment is simulated and hence the sequence that each item of equipment will try to meet the demand with its available capacity.
Equipment is simulated in the order specified, depending on the current thermostat request. For equipment of similar type, assign sequence 1 to the first system intended to serve that type of load, assign sequence 2 to the next system, and so on. The #1 sequence equipment will try to meet the entire demand with its available capacity and then pass the results on to #2 to meet any remaining load and so on.
For situations where one or more equipment types has limited capacity or limited control capability, order the sequence so that the most controllable piece of equipment runs last. For example, with a dedicated outdoor air system (DOAS), the air terminal for the DOAS should be assigned a sequence of 1. Any other equipment should be assigned sequence 2 or higher so that it will see the net load after the DOAS air is added to the zone.
Each item of zone cooling equipment associated with the current HVAC zone is listed under the Cooling Calculation Sequence header. Here you can define the order that each item of equipment is simulated and hence the sequence that each item of equipment will try to meet the demand with its available capacity.
Equipment is simulated in the order specified, depending on the current thermostat request. For equipment of similar type, assign sequence 1 to the first system intended to serve that type of load, assign sequence 2 to the next system, and so on. The #1 sequence equipment will try to meet the entire demand with its available capacity and then pass the results on to the #2 to meet any remaining load and so on.
For situations where one or more equipment types has limited capacity or limited control capability, order the sequence so that the most controllable piece of equipment runs last. For example, with a dedicated outdoor air system (DOAS), the air terminal for the DOAS should be assigned a sequence of 1. Any other equipment should be assigned sequence 2 or higher so that it will see the net load after the DOAS air is added to the zone.
For each item of zone heating equipment associated with the current HVAC zone, select a schedule that specifies the fraction of the remaining heating load this equipment will attempt to serve. This setting is only available if the Load distribution scheme is set to 1-Sequential Load.
For each item of zone cooling equipment associated with the current HVAC zone, select a schedule that specifies the fraction of the remaining cooling load this equipment will attempt to serve. This setting is only available if the Load distribution scheme is set to 1-Sequential Load.