Can anyone help me confirm my answers so far? An open-loop control system is a c

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Can anyone help me confirm my answers so far? An open-loop control system is a control system in which decisions are made based only on the current state of the system and a model of how it should work. All critical components are reused during a retrofit A control loop is the continuous repetition of the control logic decisions HVAC systems are the most common building systems to automate but are also the most complicated. The amount of heat given off from the building occupants varies depending on the activity of the occupants. The north wall of a building is 30' wide and 9' high. The wall has a door 3' wide and 7" high. The net wall area is 240 sq ft. Solar gain on walls and ceilings is combined with conduction gain in all factor tables Equivalent temperature difference is the difference between the desired indoor temperature and the outdoor temperature for a particular season which is adjusted for solar gain. A winter indoor design temperature of 75 degree F is usually selected to provide comfort for a normally clothed person during winter. To obtain the actual heating and cooling loads for a building, adjustments have to be made to totals. Ductwork and piping in cooling systems should always be insulated to reduce heat gain. Since furnaces and air conditioners are manufactured in a limited selection of sizes, the equipment chosen for a job is usually oversized for the loads. Air flow is expressed in cubic feet per minute When sizing a blower for a forced-air distribution system, it is not necessary to find the supply duct section with the highest static pressure drop and the return duct section with the highest static pressure drop. The sum of the pressure drop for the supply ductwork section and the return ductwork section is the total pressure drop for the ductwork in the system. A duct is sized to allow the required amount of air for proper heating or cooling to flow to each building space. Water pressure can be expressed in feet of head and pounds per square inch. Copper tubing is used for large applications, and iron or steel pipe is used for small applications. It is not always possible to find a pipe size that gives the exact flow rate needed. The pressure drop through a pipe fitting is found by converting the fitting pressure drop to the equivalent length of pipe that would produce the same pressure drop. A control device is a building automation device used for ____. Monitoring or changing system variables Making control decisions Interfacing with other types of systems All of the above

Explanation / Answer

1. TRUE

Open loop control system do not have any control over varying parameters in real time so, it is more stable system used only for demonstrations and in only those systems where parameter variance is very less or have no effect on the system. It only takes only one state due to, lack of the feedback.

2. FALSE.

Not all critical components are reused but, some may reusable according to requirements and condition of components

3. TRUE

A control loop is a repetition of loop transfer function for different values of errors or variations

4.TRUE.

HVAC systems are most commonly and widely used system in building automated systems.Usually we go for multiple HVAC systems combined to form one complete system.

5.TRUE.

Ofcourse it is true every occupant there own activity to do works so, statement is true

6.FALSE.

The wall area never decreases with a door in it.

7.FALSE.

Solar exposure of ceiling and doors is different and the conduction will vary according to the material used too

8.TRUE

9.TRUE

10.TRUE

11.TRUE

12.FALSE. But, there is a may be case too. In most of the cases The statement is false

13.TRUE.

Air Flow is units are Cubic Feet per minute or Cubic meter per hour ans liters per minute

14. Sorry, dude i have no idea

15. TRUE

16.TRUE

17.TRUE.

Water pressure have units of Pounds per square an inch

18.FALSE.

19.TRUE. You can't find a pipe that gives exact flow rate needed always only approximates are available

20. TRUE

multiple choice 1

An automated system has to Moniter, control, And interact with other systems to make it do a perticular task. SO, OPTION d IS right.

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