Automation and lock
Automation of ventilation systems - a relatively young field of technology. Until recently, most ventilation systems are not automated and can not be blocked from processing equipment. This does not apply to air conditioning systems, which are generally impossible without automation.
In recent years, automation and lock are increasingly used in industrial ventilation. However, even now not well developed standard solutions for standardization and automatic blocking, especially for exhaust systems.
The practice of industrial automation ventilation systems (Do not referring to the air-conditioning) shows:
a) automation devices are insufficiently reliable to use and often fail;
b) automated ventilation systems require for their maintenance
The foregoing should be considered when designing and depending on local conditions, to choose one or another degree of automation. In addition, you must include in the draft special staff personnel.
Automatics and block industrial ventilation systems can be divided into three groups:
air-supply system, including air curtains;
Exhaust system - general exchange with local suction;
suction system, working in conjunction with gidroobespylivaniem.
Automating the supply air systems, in essence simply repeats the automatic air conditioning machines - the most developed area. Here are sample solutions and schemes used commercially available reliable devices, including actuators prefabrication, such as insulated and pass. Typical solutions for air handling units, designed Santehproektom are presented in a series of albums RH-02 136. Of those in the release patterns of automation for industrial ventilation are most applicable scheme в„– 3 -10, as well as number 16 - 18 (last scheme applies to ventilation).
not dwell on the numerous schemes automation supply plants, citing as an example of one of them, namely the scheme в„– 4. This scheme is shown in Fig. 26. provides automation supply plant of average productivity with air filtration for the coolant vapor.
Considered supply plant can deliver air at a constant temperature for air showers or to compensate for local suction hoods in rooms with heat or heating devices in the absence of recycling. Heat consumption for ventilation is not limited to, the outside temperature below the calculated ventilation (parameters A). Heaters supply plant designed for heating air from the design temperature for heating (options B) to the desired supply air temperature.
scheme provides for automatic adjustment of the supply air temperature by changing the heat radiators double bypass valve heaters and automatic protection from freezing. In addition, provision blocking valve outside air and the bypass valve with an electric fan, block valve on the coolant with a bypass valve, and control the fan motor and filter control parameters of air and coolant and the alarm system for emergency disconnect installation.
When you turn on the fan motor warmed fresh air valve opens and the bypass valve is connected to the controller. When you turn off the electric motor both valves are closed.
At the position the bypass valve, corresponding to complete skipping of air bypassing the radiator, the valve on the coolant is closed. The remaining provisions of the bypass valve on the coolant valve is open.