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2699bad | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | import gradio as gr
def calculate_tvm(initial_investment, annual_revenue, annual_opex, tax_rate, years, discount_rate):
# Convert percentages to decimals
i = discount_rate / 100
t_rate = tax_rate / 100
annual_cash_flow = (annual_revenue - annual_opex) * (1 - t_rate)
# Calculate NPV
npv = -initial_investment
for t in range(1, int(years) + 1):
npv += annual_cash_flow / ((1 + i) ** t)
# Calculate Simple Payback Period
if annual_cash_flow > 0:
payback = initial_investment / annual_cash_flow
else:
payback = float('inf')
return (
f"Resulting NPV: ${round(npv, 2):,}",
f"Annual After-Tax Cash Flow: ${round(annual_cash_flow, 2):,}",
f"Simple Payback Period: {round(payback, 2)} years"
)
# Define the Interface
with gr.Blocks(theme=gr.themes.Soft()) as demo:
gr.Markdown("# 🧪 Chemical Engineering TVM Calculator")
gr.Markdown("Evaluate the economic viability of process equipment or plant expansions.")
with gr.Row():
with gr.Column():
inv = gr.Number(label="Initial Investment ($)", value=1000000)
rev = gr.Number(label="Annual Revenue ($)", value=500000)
opex = gr.Number(label="Annual OPEX ($)", value=150000)
with gr.Column():
tax = gr.Slider(0, 50, value=21, label="Tax Rate (%)")
years = gr.Slider(1, 30, value=10, step=1, label="Project Life (Years)")
disc = gr.Slider(0, 20, value=10, label="Discount Rate / MARR (%)")
btn = gr.Button("Calculate Economic Viability", variant="primary")
with gr.Row():
out_npv = gr.Textbox(label="Net Present Value (NPV)")
out_cash = gr.Textbox(label="Annual Cash Flow")
out_payback = gr.Textbox(label="Payback Period")
btn.click(
fn=calculate_tvm,
inputs=[inv, rev, opex, tax, years, disc],
outputs=[out_npv, out_cash, out_payback]
)
if __name__ == "__main__":
demo.launch()
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