상황
A test engineer documents the coolant loop used to characterize engine warm-up behavior and thermostat opening/closing responses under controlled flow and heat rejection.
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01
Use hx_shell_tube for the engine block heat source to avoid an undefined engine symbol
02
Model the thermostat as a motor-actuated control valve with fail-open to prevent overtemperature
03
Add process_minor bypass and relief lines returning to the reservoir for safe warm-up operation
Reuse for any engine cooling test bench or component rig where coolant flow, thermostat response, and heat rejection need documented instrumentation.