CIBSE Guide H: Building Control Systems - download pdf or read online

By Cibse

ISBN-10: 0750650478

ISBN-13: 9780750650472

'Building regulate Systems' offers the development companies engineer with a entire knowing of recent keep an eye on structures and suitable details expertise. this may make sure that the simplest type of regulate platforms for the development is detailed and that right provision is made for its set up, commissioning, operation and maintenance.

Beginning with an summary of the advantages of the fashionable development keep an eye on process, the authors describe the various controls and their functions, and contain recommendation on their set-up and tuning for sturdy operation. There are chapters at the sensible layout of keep watch over structures, the right way to paintings from the elements and their inclusion in networks, via to manage ideas in Heating, air flow and air-con (HVAC) platforms and entire buildings.

The dating among development, administration platforms (BMS) and data expertise platforms is mentioned, and the construction procurement strategy and the significance of contemplating keep an eye on standards at an early degree within the layout procedure.

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For damper control. e. whether increasing control air pressure results in opening or closing of the valve or damper. Most pneumatic actuators are of the single-action type where the force on the diaphragm is opposed by a spring and the net force applied to the valve or damper is the difference between them. When the air pressure is removed the spring will return the valve to the selected extreme position and this may be used for fail-safe requirements. When a straightforward pneumatic actuator operates against large or variable forces the position of the actuator spindle may not be proportional to the signal pressure from the controller.

6 shows in stylised form the basic characteristic curves for the four types described above. The static characteristics are measured by measuring the flow as a function of valve position for a constant pressure drop across the valve. In a real circuit, the characteristic is modified by the authority of the valve; this is discussed further below. Equal percentage valves have a theoretical characteristic which may be expressed as an equation relating flow through the valve to the degree of opening, measured at constant pressure drop.

2 Sensor requirements Signal Application Sensor requirement Checklist 0–10 V DC Standard for HVAC applications Type Status, analogue, intelligent 4–20 mA Common in process control Sensed medium Air, water, gas, oil Voltage-free contact For status indication Sensed quantity Temperature, pressure, velocity, humidity Pulse Energy and flow measurement Location Space, duct, pipe Housing Accessibility, effect on accuracy and speed Accuracy Accuracy, resolution, hysteresis, repeatability Operating range The range over which the sensor performs accurately Overload range The range to which the sensor may be subjected without damage Response time Affected by sensor, housing and medium Protection Is protection required from a damaging environment?

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