openph-demand 0.1.1

OpenPH Demand - Energy demand calculations for Passive House

OpenPH-Demand

Heating, cooling, and ground demand calculations for PHPP

Part of the openph UV workspace - implements PHPP energy demand calculations with exact numerical fidelity to Excel PHPP.

Purpose

OpenPH-Demand calculates:

• Annual Heating Demand: Transmission and ventilation heat losses, internal/solar gains
• Annual Cooling Demand: Solar gains, internal gains, cooling strategies
• Ground Heat Transfer: Temperature calculations for ground-coupled surfaces
• Peak Heating/Cooling Loads: Design load calculations

Structure

openph-demand/
├── src/
│   └── openph_demand/
│       ├── heating_demand/
│       ├── cooling_demand/
│       ├── ground/
│       ├── get_solvers.py
│       └── solvers.py
├── tests/
└── pyproject.toml

Usage

from openph_demand import get_solvers

# Get demand solvers
heating_solver = get_solvers.get_heating_demand_solver()
cooling_solver = get_solvers.get_cooling_demand_solver()

# Calculate annual demands (kWh/m²·a)
annual_heating = heating_solver.calculate(phpp_model)
annual_cooling = cooling_solver.calculate(phpp_model)

Development

Part of UV workspace - see root context/ENVIRONMENT.md:

uv sync                           # Install all workspace packages
uv run pytest openph-demand/tests/ # Run tests