Parallel and counterflow heat exchangers

Compute an inspectable engineering model using SI inputs. See the linked domain guide for assumptions and benchmark checks.

import matplotlib.pyplot as plt
import numpy as np

from engineeringkit.heat_transfer import exchanger_effectiveness_counterflow, exchanger_effectiveness_parallel

ntu = np.linspace(0, 5, 101)
fig, ax = plt.subplots()
for ratio in [0.5, 1]:
    counter = [exchanger_effectiveness_counterflow(n, ratio) for n in ntu]
    parallel = [exchanger_effectiveness_parallel(n, ratio) for n in ntu]
    ax.plot(ntu, counter, label=f"counterflow Cr={ratio}")
    ax.plot(ntu, parallel, "--", label=f"parallel Cr={ratio}")
ax.set(xlabel="NTU", ylabel="effectiveness", ylim=(0, 1))
ax.legend()

plt.show()