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Example 2: HVAC System Design Exploration

Iterate on HVAC design by adding a DOAS system, inspecting plant loops, and tuning component properties.

Scenario

A mechanical engineer is designing a DOAS + fan coil system for an office. They want to set chilled water to 44F and hot water to 140F, then inspect the cooling tower sizing.

Prompt

Create a 10-zone building with a DOAS + fan coil system. Set the chilled water supply to 44F and the hot water to 140F. What components are on each plant loop?

Tool Call Sequence

1. create_baseline_osm(name="doas_office", ashrae_sys_num="07")
2. load_osm_model(osm_path=...)
3. add_doas_system(thermal_zone_names=[...], zone_equipment_type="FanCoil")
4. list_plant_loops()
5. set_sizing_properties(plant_loop_name="Chilled Water Loop",
     design_loop_exit_temperature_c=6.67)
6. set_sizing_properties(plant_loop_name="Hot Water Loop",
     design_loop_exit_temperature_c=60.0)
7. get_plant_loop_details(plant_loop_name="Chilled Water Loop")
8. get_plant_loop_details(plant_loop_name="Hot Water Loop")

Follow-up: Tune Cooling Tower

9.  list_hvac_components()
10. get_component_properties(component_name="Cooling Tower...")
11. set_component_properties(component_name="Cooling Tower...",
      properties={"design_water_flow_rate_m3_per_s": 0.005})

Key Tools Used

Tool Purpose
add_doas_system Creates DOAS air loop + zone fan coils
set_sizing_properties Adjusts plant loop temperatures
list_hvac_components Discovers all HVAC components
get/set_component_properties Read and modify equipment

Supported Zone Equipment Types

Type Description
FanCoil Four-pipe fan coil unit
Radiant Low-temp radiant floor/ceiling
ChilledBeam Active chilled beam

Integration Test

See tests/test_example_workflows.py::test_workflow_hvac_design_exploration