Industrial HVAC System

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Tetra packing machines basically used for high speec filling and processing appliacation. Aseptic area having major heat so required normal temoerature control with the help of water based forced air ventilation. Filling section machnery speed are very high so need to maintain Rh, room possitve pressure and flow patter are differnt than normal hvac. We nned to take care bootom inlet and wall outlet at top side. All coooling flow pattern will be bottom to top.  Tatra pack machiner are very sensetive and having complex automation so need to take care dust control as well as  moisture control. Aseptic area is major Challenger for comfort cooling. We have installed almost 10 Lakh CFM installation for Aseptic are only. This Area required to remove generated heat directly to ambient without spread to working zone. Water based cooling system like Air washer & Ambiator can fulfill the fresh air required without affecting so much operating cost factor.

HVAC systems provide controlled environmental conditions for the various processes in the paper and pulp manufacturing industry. The criteria involve control measures such as:

Engine test benches are crucial instruments to perform tests on internal combustion engines. Possible purposes of these tests are to detect the engine performance, check the reliability of the components or make a proper calibration of engine control systems managing the actuations. Since many factors affect tests results in terms of performance, emissions and components durability, an engine test bench is equipped with several conditioning systems (oil, water and air temperature, air humidity, etc.).

One of the most important systems is the HVAC (Heating, Ventilating and Air Conditioning), that is essential to control the conditions of the intake air. Intake air temperature, pressure and humidity should be controllable test parameters, because they play a key role on the combustion development. In fact, they can heavily affect the performance detected, such as power and specific consumption, and, in some cases, they may promote knock occurrence.

This work presents an HVAC model-based control methodology, where each component of the air treatment system (humidifier, pre-heating and post-heating resistors, chiller and fan) is managed coupling open-loop and closed-loop controls. Each branch of the control model is composed of two parts, the first one to evaluate the target for the given HVAC component, based on the system physical model, the second one is a PID controller based on the difference between the set-point and the feedback values.

The control methodology has been validated on an engine test bench where the automation system has been developed on an open software Real-Time compatible platform, allowing the integration of the HVAC control with all other functionalities concerning the test management. The paper shows the plant layout, details the control strategy and finally analyzes experimental results obtained on the test bench, highlighting the benefits of the proposed HVAC