ZoneHVAC:IdealLoadsAirSystem is a special class. It insert and extract heat directly into and out a zone directely without using any system. It used to be called "Purchased Air". There are still a few examples in the exampleFiles folder using the Purchase Air.
The quantity of air used is now District heating and District cooling which can be applied to water as well.
I use ZoneHVAC:IdealLoadsAirSystem to make sure that the building envelope and the general control and display, etc. are all working.
If you use the IDFeditor to enter objects, you can enter the objects and nodes directly.
Because there many fields to enter using the IDFeditor, the templates were introduced to show the user how standard system can be generated.
You have used the HVACTemplate:Zone:IdealLoadsAirSystem and the HVACTemplate:Thermostat to give you a working IDF. If you look at the expIDF, there are a lot of new objects generated.
With equipment, there will be Zone list, zone equipment, zone connection, etc. In each of these there will be a number of special node name and node lists.
The getting started manual show you how to enter these directly. The general advice is to look at the example files and use cut and paste, and then edit to match your requirement.
The template methode allows you to change the equiment options and obtain a working IDF directly.
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If you are only interested in inproving building design, it is not necessary to go any further. The ZoneHVAC:IdealLoadsAirSystem with the setpoint schedules would provide all the heating and cooling characteristic and loads. Any system you add would be less efficient.
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PTHP is the heatpump model. If you do not use the heating, it is the same as a window unit. This can be directly installed in a zone.
PTAC I think, is a splitt unit with fan coil.
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When you have one room, it is only difference is equipment size and ducting. The window unit blows air into the room with a duct.
If you have more than one room, then the air will be ducted. Then you have dampers, common AHU, return air and outdoor air mixer, etc. Because the zone theremostat can only control one system, only one zone is directly controlled and the other zones are slaved by fixing the damper position, using the AirTerminalUnit:uncontrolled. (Old name was Direct Air) This is the common arrangement.
If you have a large building and wanted to have more theemostat control, then you will use a fan coil unit in each zone. Each of this unit is like a window unit plus a heater. If you use water, it becomes a four pipe fan coil unit.
The HVACTemplate:zone:Unitary will expend into zone equipment.
The HVCTemplate:system:Unitary will expand
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The quantity of air used is now District heating and District cooling which can be applied to water as well.
I use ZoneHVAC:IdealLoadsAirSystem to make sure that the building envelope and the general control and display, etc. are all working.
If you use the IDFeditor to enter objects, you can enter the objects and nodes directly.
Because there many fields to enter using the IDFeditor, the templates were introduced to show the user how standard system can be generated.
You have used the HVACTemplate:Zone:IdealLoadsAirSystem and the HVACTemplate:Thermostat to give you a working IDF. If you look at the expIDF, there are a lot of new objects generated.
With equipment, there will be Zone list, zone equipment, zone connection, etc. In each of these there will be a number of special node name and node lists.
The getting started manual show you how to enter these directly. The general advice is to look at the example files and use cut and paste, and then edit to match your requirement.
The template methode allows you to change the equiment options and obtain a working IDF directly.
==========================
If you are only interested in inproving building design, it is not necessary to go any further. The ZoneHVAC:IdealLoadsAirSystem with the setpoint schedules would provide all the heating and cooling characteristic and loads. Any system you add would be less efficient.
=========================
PTHP is the heatpump model. If you do not use the heating, it is the same as a window unit. This can be directly installed in a zone.
PTAC I think, is a splitt unit with fan coil.
=========================
When you have one room, it is only difference is equipment size and ducting. The window unit blows air into the room with a duct.
If you have more than one room, then the air will be ducted. Then you have dampers, common AHU, return air and outdoor air mixer, etc. Because the zone theremostat can only control one system, only one zone is directly controlled and the other zones are slaved by fixing the damper position, using the AirTerminalUnit:uncontrolled. (Old name was Direct Air) This is the common arrangement.
If you have a large building and wanted to have more theemostat control, then you will use a fan coil unit in each zone. Each of this unit is like a window unit plus a heater. If you use water, it becomes a four pipe fan coil unit.
The HVACTemplate:zone:Unitary will expend into zone equipment.
The HVCTemplate:system:Unitary will expand
Dear Dr.Li,
Thank you for the answer. I actually used ZoneHVAC:IdealLoadsAirSystem. So if I want to get the energy used in electricity, I must specify HVACTemplate:System:Unitary in order to model the DX coil?
Sincerely yours,
Malindo
Mech. Engineering student
Singapore
Thank you for the answer. I actually used ZoneHVAC:IdealLoadsAirSystem. So if I want to get the energy used in electricity, I must specify HVACTemplate:System:Unitary in order to model the DX coil?
Sincerely yours,
Malindo
Mech. Engineering student
Singapore
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