Found this interesting technology on how to automate your mist spray system in your birdhouse. Please get more details from: http://www.karasto.de/english/luftbefeuchtung.php
How to automate your mists spray in your birdhouse.
Something that I came across that you might think of. This is not a recommendation but something that you should know about:
The DVS consists of individual atomiser elements that are capable, under application of compressed air, of generating superfine liquid droplets. The supply of the atomisation media is achieved with the so-called "tube within a tube" system, comprising an inner tube which carries the fluid and a concentrically arranged carrier tube. The atomising air is passed through the annular gap between the inner and outer tubes.
Connection of the atomiser elements with each other is achieved on both sides by axial insertion of the tube system into the nozzle fitting (using a modular push-fit system). The atomiser elements have the additional function of acting as coupling elements between the tubes. The system is designed so that up to 20 nozzles can be connected together in a tube chain. By means of the electrical control unit, the DVS can be directly connected to the compressed air supply and the water supply. Alternatively, the system can be operated on the injector principle. This last possibility offers the capability of independently drawing spray fluids such as plant protection or disinfectant substances from an open container and releasing them into the air in the form of a uniform mist. Non-return valves are integrated into the atomiser elements. These, in conjunction with the three-way pressure-relief valve integrated into the control unit, allows completely drip-free switching on and off of the nozzle chain.
The control unit controls the air and water supply by means of a hygrostat. Using this, up to 40 nozzles (2 chains of 20 nozzles each) can be controlled at once. It has an emergency off arrangement, which automatically interrupts the fluid supply to the nozzles in the event of a failure in the compressed air supply.
The electrical control unit can be obtained in two versions:
Version I (= with hygrostat):
Programmable hygrostat (Two point controller)
Actual and target value display, digital
Normalised measurement input for humidity sensor 4 - 20 mA
Humidity sensor, measuring range 0...100 % RH can also be supplied
Zero-potential input for connection of external control units, such as air-conditioning computers.
Version II (= without hygrostat)
Zero-potential input for connection of external control units, such as air-conditioning computers.
Application Areas
Greenhouses: Humidification, cooling, atomisation of plant protection products
Air-conditionging in rooms
Dust bonding in production processes
Timber processing
Printing plants
Technical Data
Water throughflow: 0 - 200ml/min per nozzle
Atomisation performance: controllable over a broad range by regulating the ratio of the air and water flows.
Mean droplet size (Sauter diameter): 10 - 30 µm
Maximum number of nozzles per chain:
Fluid pressure operation: 20 nozzles (£38 m pipe length, with lateral nozzle separation of 2m)
Automatic suction: 8 -10 nozzles (£18 m pipe length, with lateral nozzle separation of 2m)
System Features
Modular Design
1 to 20 nozzles can be joined together in a chain.
"Tube within a tube" push-fit connection
Cost-effective, space-saving assembly using standard PVC pipes without any additional connection fittings.
No-Tool Assembly
Securing of carrier pipe achieved with integrated locking ring.
Optional Fluid Pressure or Suction Operation (injector principle)
The DVS can be connected via the electrical control system directly to the pressurised water supply or a pressure pump (for fluid pressure operation). With fluid pressure operation, the fluid supply is provided via the dosing valve integrated into the nozzle fitting. Alternatively, the DVS can function in suction mode using the injector principle to atomise active ingredient solutions or emulsions evenly along a chain of nozzles (Fluid suction operation = without a dosing valve).
Integrated non-return valve with filter insert
enables drip-free switching off of the nozzle chain also in fluid pressure operation in combination with a centrally controlled three-way pressure relief valve (Functional schematic). The otherwise usual provision of a third line for pneumatic control of the opening and closing of a needle valve is no longer necessary. The integrated ball non-return valve also prevents emptying of the fluid line both in fluid pressure operation and suction operation, following switching off. On switching on again or in cyclical operation, this ensures pulsation-free and drip-free functioning of the nozzle system.
Variable Areas of Use Through Adaptation of the Atomisation Parameters
Depending on the application area, the requisite droplet size can be varied over a broad range by adjustment of the water and air throughput rates.
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