def milp_constr_var_chp(om, block):
    milc.add_variable_linear_eta_relation(om, block)
    milc.add_startup_constraints(om, block)
    milc.set_bounds(om, block, side='output')
    milc.add_minimum_downtime(om, block)
def milp_constr(om, block):
    milc.add_startup_constraints(om, block)
    milc.set_bounds(om, block, side='output')
    milc.add_minimum_downtime(om, block)