app.py

import streamlit as st

# Set page configuration
st.set_page_config(page_title="Hydraulic Pump Power Calculator", page_icon="\U0001F6E0", layout="centered")

# Unit conversion factors
UNIT_CONVERSIONS = {
    "Displacement": {"cc/rev": 1, "in^3/rev": 16.387, "liters/rev": 1000},
    "Pressure": {"bar": 1, "MPa": 10, "PSI": 0.0689476, "kPa": 0.01, "atm": 1.01325},
    "Torque": {"Nm": 1, "lb-ft": 1.35582},
    "Flow Rate": {"L/min": 1, "m^3/h": 16.6667, "GPM (US)": 3.78541, "GPM (UK)": 4.54609}
}

# Hydraulic Power Calculation and Missing Parameter Estimation
@st.cache
def calculate_hydraulic_parameters(displacement, pressure, rpm, torque, flow_rate, 
                                     displacement_unit, pressure_unit, torque_unit, flow_rate_unit):
    # Convert inputs to base units
    displacement_cc = displacement * UNIT_CONVERSIONS["Displacement"].get(displacement_unit, 1) if displacement else None
    pressure_bar = pressure * UNIT_CONVERSIONS["Pressure"].get(pressure_unit, 1) if pressure else None
    torque_nm = torque * UNIT_CONVERSIONS["Torque"].get(torque_unit, 1) if torque else None
    flow_rate_lpm = flow_rate * UNIT_CONVERSIONS["Flow Rate"].get(flow_rate_unit, 1) if flow_rate else None

    # Calculate missing parameters if possible
    if displacement_cc and pressure_bar and rpm and not torque_nm:
        torque_nm = (displacement_cc * pressure_bar) / (20 * 3.14159)
    elif torque_nm and pressure_bar and rpm and not displacement_cc:
        displacement_cc = (torque_nm * 20 * 3.14159) / pressure_bar
    elif torque_nm and displacement_cc and rpm and not pressure_bar:
        pressure_bar = (torque_nm * 20 * 3.14159) / displacement_cc

    # Calculate power using available data
    power_displacement = (displacement_cc * pressure_bar * rpm) / 600.0 if displacement_cc and pressure_bar and rpm else None
    power_torque = (torque_nm * rpm) / 9549 if torque_nm and rpm else None
    power_flow_rate = (flow_rate_lpm * pressure_bar) / 600.0 if flow_rate_lpm and pressure_bar else None

    # Convert results to all available units
    results = {
        "displacement": {unit: displacement_cc / factor for unit, factor in UNIT_CONVERSIONS["Displacement"].items()} if displacement_cc else {},
        "pressure": {unit: pressure_bar / factor for unit, factor in UNIT_CONVERSIONS["Pressure"].items()} if pressure_bar else {},
        "torque": {unit: torque_nm / factor for unit, factor in UNIT_CONVERSIONS["Torque"].items()} if torque_nm else {},
        "flow_rate": {unit: flow_rate_lpm / factor for unit, factor in UNIT_CONVERSIONS["Flow Rate"].items()} if flow_rate_lpm else {},
        "power_displacement": power_displacement,
        "power_torque": power_torque,
        "power_flow_rate": power_flow_rate
    }
    return results, displacement_cc, pressure_bar, torque_nm, flow_rate_lpm

# Streamlit App
st.title("Hydraulic Pump Power Calculator")
st.sidebar.header("Input Units")

# Unit selection
displacement_unit = st.sidebar.selectbox("Displacement Unit:", ["cc/rev", "in^3/rev", "liters/rev"])
pressure_unit = st.sidebar.selectbox("Pressure Unit:", ["bar", "MPa", "PSI", "kPa", "atm"])
torque_unit = st.sidebar.selectbox("Torque Unit:", ["Nm", "lb-ft"])
flow_rate_unit = st.sidebar.selectbox("Flow Rate Unit:", ["L/min", "m^3/h", "GPM (US)", "GPM (UK)"])

st.sidebar.header("Input Parameters")

# User inputs
displacement = st.sidebar.number_input("Pump Displacement (cc/rev, in^3/rev, or liters/rev):", value=None, step=0.1, format="%.2f")
pressure = st.sidebar.number_input("Working Pressure (bar, MPa, PSI, kPa, or atm):", value=None, step=0.1, format="%.2f")
rpm = st.sidebar.number_input("Pump RPM:", value=None, step=1.0, format="%.0f")
torque = st.sidebar.number_input("Torque (Nm or lb-ft):", value=None, step=0.1, format="%.2f")
flow_rate = st.sidebar.number_input("Flow Rate (L/min, m^3/h, GPM (US), or GPM (UK)):", value=None, step=0.1, format="%.2f")

# Calculate parameters and power
if st.sidebar.button("Calculate"):
    results, displacement_cc, pressure_bar, torque_nm, flow_rate_lpm = calculate_hydraulic_parameters(
        displacement, pressure, rpm, torque, flow_rate,
        displacement_unit, pressure_unit, torque_unit, flow_rate_unit
    )

    st.subheader("Results")

    # Display formulas
    st.write("### Formulas Used:")
    if displacement_cc and pressure_bar and rpm:
        st.write("Power based on Displacement: Power (kW) = (Displacement (cc/rev) × Pressure (bar) × RPM) / 600")
    if torque_nm and rpm:
        st.write("Power based on Torque: Power (kW) = (Torque (Nm) × RPM) / 9549")
    if flow_rate_lpm and pressure_bar:
        st.write("Power based on Flow Rate: Power (kW) = (Flow Rate (L/min) × Pressure (bar)) / 600")

    # Display input conversions
    st.write("### Converted Input Parameters:")
    if displacement_cc:
        st.write(f"Displacement: {displacement_cc:.2f} cc/rev")
    if pressure_bar:
        st.write(f"Pressure: {pressure_bar:.2f} bar")
    if torque_nm:
        st.write(f"Torque: {torque_nm:.2f} Nm")
    if flow_rate_lpm:
        st.write(f"Flow Rate: {flow_rate_lpm:.2f} L/min")

    # Display results for all units
    if results["displacement"]:
        st.write("### Pump Displacement:")
        for unit, value in results["displacement"].items():
            st.write(f"{value:.2f} {unit}")

    if results["pressure"]:
        st.write("### Working Pressure:")
        for unit, value in results["pressure"].items():
            st.write(f"{value:.2f} {unit}")

    if results["torque"]:
        st.write("### Torque:")
        for unit, value in results["torque"].items():
            st.write(f"{value:.2f} {unit}")

    if results["flow_rate"]:
        st.write("### Flow Rate:")
        for unit, value in results["flow_rate"].items():
            st.write(f"{value:.2f} {unit}")

    # Power results
    st.write("### Hydraulic Power:")
    if results['power_displacement']:
        st.write(f"Based on Displacement: {results['power_displacement']:.2f} kW / {(results['power_displacement'] * 1.34102):.2f} HP")
    else:
        st.write("Power based on Displacement: Not calculable.")

    if results['power_torque']:
        st.write(f"Based on Torque: {results['power_torque']:.2f} kW / {(results['power_torque'] * 1.34102):.2f} HP")
    else:
        st.write("Power based on Torque: Not calculable.")

    if results['power_flow_rate']:
        st.write(f"Based on Flow Rate: {results['power_flow_rate']:.2f} kW / {(results['power_flow_rate'] * 1.34102):.2f} HP")
    else:
        st.write("Power based on Flow Rate: Not calculable.")

# Hugging Face Space Deployment Notice
st.sidebar.markdown("---")
st.sidebar.write("This app is ready for deployment on Hugging Face Spaces using Streamlit.")
st.sidebar.write("To deploy, include this `app.py` and `requirements.txt` in your Hugging Face Space repository.")