Please i need help with this code,its for my project

[Geminiman7]

import tespy
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
from tespy.networks import Network
from tespy.components import Sink, Source, Pump, HeatExchanger, Valve, Compressor, CycleCloser
from tespy.connections import Connection, Bus
from tespy.tools.characteristics import CharLine
from tespy.tools.characteristics import load_default_char as ldc

# Define the working fluid
fluid_list = ['R404A']

# Network setup
network = Network(fluids=fluid_list, T_unit='C', p_unit='bar', h_unit='kJ / kg', m_unit='kg / s')

# Define sources and sinks
source = Source('Ambient')
sink = Sink('Heat Sink')

# Define components
storage_tank = HeatExchanger('Evaporator')
condenser = HeatExchanger('Condenser')
expansion_valve = Valve('Expansion Valve')
compressor = Compressor('Compressor')
air_cooler = HeatExchanger('Air Cooler')

# Cycle Closer to ensure the fluid returns to the cycle
cycle_closer = CycleCloser('Cycle Closer')

# Connecting components together

# R404A enters the compressor
conn_source_compressor = Connection(source, 'out1', compressor, 'in1')

# From compressor to condenser
conn_compressor_condenser = Connection(compressor, 'out1', condenser, 'in1')

# From condenser to expansion valve
conn_condenser_valve = Connection(condenser, 'out1', expansion_valve, 'in1')

# From expansion valve to air cooler
conn_valve_air_cooler = Connection(expansion_valve, 'out1', air_cooler, 'in1')

# Air cooler to ice storage tank
conn_air_cooler_storage_tank = Connection(air_cooler, 'out1', storage_tank, 'in1')

# Ice storage tank to cycle closer (closing the loop)
conn_storage_tank_cycle_closer = Connection(storage_tank, 'out1', cycle_closer, 'in1')

# Cycle closer to sink
conn_cycle_closer_sink = Connection(cycle_closer, 'out1', sink, 'in1')

# Add connections to the network
network.add_conns(conn_source_compressor, conn_compressor_condenser, conn_condenser_valve,
                  conn_valve_air_cooler, conn_air_cooler_storage_tank, conn_storage_tank_cycle_closer, conn_cycle_closer_sink)

# Define Components Geometry

# Set compressor parameters
compressor.set_attr(eta_s=0.80)

# Set condenser parameters
condenser.set_attr(pr1=0.98, pr2=0.98, Q=2.75e3)

# Set expansion valve parameters
expansion_valve.set_attr(pr=0.6)

# Set storage tank parameters
storage_tank.set_attr(pr1=0.98, pr2=0.98, Q=-2.75e3)

# Air cooler parameters
air_cooler.set_attr(pr1=0.98, pr2=0.98, ttd_u=10)

# Set source and sink conditions
conn_source_compressor.set_attr(T=25, p=2.3, fluid={'R404A': 1})
conn_compressor_condenser.set_attr(p=14.3)
conn_condenser_valve.set_attr(T=-25)

network.solve('design')
network.print_results()

# Reference state for exergy analysis
T0 = 298.15  # Reference temperature (K)
p0 = 1.013  # Reference pressure (bar)

for conn in network.conns.all():
    h = conn.h.val_SI  # Enthalpy (J/kg)
    s = conn.s.val_SI  # Entropy (J/(kg K))
    exergy = (h - 0) - T0 * (s - 0)  # Simplified exergy calculation (assuming h_ref and s_ref are zero)
    print(f'Exergy at connection {conn.label}: {exergy} J/kg')

I keep getting an error that one of my component is missing an outgoing connection,I have tried everything possible,but still nothing

[maltefritz]

Hey @Geminiman7, I've understood that your model doesn't work. Could you ask a specific question so that you can be helped?

While screening your code, I noticed that you are using both source and sink as well as cycle closer in the main cycle. I recommend that you only use the cycle closer component. You also specify your condenser, evaporator and air cooler as heat exchanger component. It is necessary that you specify an inlet and an outlet on the cold side of these components. Otherwise it is possible to use the heat exchanger simple component. Hopefully it will help you.

[fwitte]

@maltefritz, thank you for replying!

I want to add to the reply: familiarize yourself with the tespy API, the components and the approach of the software on modeling things. There are a lot of basic examples available in the docs and they also give valuable tips on how to learn using the software.

[Geminiman7]

Thank u so much,I already used just the cycle closer and I put away both the heat source and heat sink
Buy am still stuck with the error that my air cooler component is missing an outgoing connection

[fwitte]

Like I said, learn the basics first, then this project will be easy :).

[maltefritz]

As I wrote, the HeatExchanger component has an inlet and an outlet for the hot side and also for the cold side. It seems to me that you are only specifying the inlet and outlet for hot side. Specify the cold side of all your HeatExchanger components or use the SimpleHeatExchanger component instead.

[Geminiman7]

Thank you so much for your help,am grateful,however after implementing the corrections,i encountered another stumbling block here,what do you advise i do