Real-Time Structured Analysis Specification For The CHCSV10

System Overview

Software engineering denotes to a branch related to development of software product with well-defined scientific processes, methods, procedures and principles. In this task we will be using scientific principles such as ERD, DFD and SPECs to develop water heating software.

Kiremire, (2011), ERD diagram in software engineering refers to the process of diagram representation of relationships, attributes and entities. It offers the relationships for database in software design system. In the figure below we present a visual concept of Central Heating System Version 10 (CHCV10). It portraits how the inner parts of the system interrelates with the outer setting. In the graphic diagram, cardinalities and modalities together with their relationships are provided

In the diagram above, it is assumed that:

• supplied gas to the room is fanned with one or more pipes
• The heating system has only one control panel board. This control panel coordinates system activities.
• Gas supply comes from one and only one supply pipe.
• Each subsystem control panel has more than one or zero operators.

Kendall & Kendall, (2014).

Laplante & Ovaska (2012), context diagram outlines specific boundaries in a certain system or environment.

Assumptions

• Our system real-time water heating system CHCV10 offers boundaries in the system.
• This real-time system is the introduced system in the task as Heating Water Company
• Physical entities exists in the system. These entities  include but are not limited to  gas, clock system, supply pipes

Assumptions

• Manual control activities system get  information from user
• Processes for instance stop, start manipulates the heating CHCV10 system
• Air replacement fetch information from temperature detection system

Pressman, (2010), explains process specification as a scheme deployed to analyse, document and explain judgement making logic and prescriptions used to produce data from the input methods’ information. Hatley & Pirbhai(2013), the process essentially flows down processes specifying engineering needs and techniques. As outlined below, these are design language for our water heating company system.

Heating Unit 

if

<50% of pipe ducts are open

then

heating system turned on

else if

room temperature falls below minimum required

then room heated

until

room temperature measured is above range

else

no heating alert displayed

then

heating system is turned on manually

end

System Clock 

if power energy is available

then

clock system  always on

else if

power energy  backup available

then

clocking system is always on

end

System control

if

time of the day is between 12:00:00 am and 5:59:00 am

then

room temperature range of 5 to 10 degrees Celsius maintained

else

turn on heating system

else if

time of the day is between 7:00:00 am 5:59:00 pm

then

room temperature of 15 to 20 kept constant

else if

time of the day is between 6:00:00 pm and 11:59:00 pm

then

room temperature of 5 and 10 kept constant

else if

manual heating is set to certain temperature

then override automatic heating system

until

heating system  is scheduled to turn on

else if

Fan and Heating unit are turned on

then

turn on automatic heating system

else

heating system shows updated room temperature status

end

Heating Duct 

if pipe duct closed manually

then

open it manually again

else if

heating duct system closed by CHCSV10

then

 open heating duct system  by CHCSV10

end if

if central heating system working

then

pipe duct system report status

else if

no status report

end if

if new active status determined

then

display new status alerts

else

display latter status

end

Gas Meter Supply

if

gas supplied is available

then

record of available gas is obtained.

else if

gas supplied in not available

then

no record of gas supplied

end if

else if

gas supply is  unavailable

then

gas supply is stopped

end if

end

Temperature Detector System

if power available

then

temperature detector system is on

else if

power backup energy available

then

temperature detector System on

end if

if central system working

then

temperature detector system send temperature status alerts to monitor display

else

no temperature alerts display

end

Control Specifications (CSPECs)

Jalote, (2012), explains Control Specifications as the constraints of a physical production method. Control Specifications Controls simulates system activities from different level of operation to an additional level. Our water heating system has Control Specifications as outlined below:

Input Actions
Start or Stop	0	1	0	0	0	0
Screen Monitor event status finished	0	0	0	1	0	0
Gas notification	0	0	1	1	0	0
Timing out	0	0	0	0	0	1
Display action status Incomplete	0	0	1	0	0	0
Sensor activity	0	0	0	0	1	0
Output
Signal of Temperature	0	0	0	0	1	0
Process activation
User Interruption	1	0	0	1	0	1
Invoke/Deactivate heating system	0	1	0	0	0	0
Show statuses and messages	1	0	1	1	1	1
System Control and Screen Monitor	0	1	0	0	1	1

Krishna, (2011), a data dictionary denotes to a description of informational entities in a data modelling. It benefits programmers who use the data dictionaries as a point of reference during their coding activities. The following is our water heating data dictionary.

Data Structure
Gas from fanning system	Volume: as required Temperature: as required in degrees Celsius
Flow rate: as adjusted
Normal gas	Normal gas = Natural gas
Warm gas	heated gas=
——- Flow rate: as adjusted in m/s
Temperature: as required in degrees Celsius
Volume: as required

Gas supplied in the room	Volume: as required Temperature: as needed in degrees Celsius
Flow rate: as adjusted

Supplied gas	Supplied gas =
Volume : as required Flow rate: as required
Other versions: filtered or unfiltered

References

Hatley, D., & Pirbhai, ‎. (2013). Strategies for Real-Time System Specification. Boston: Addison-Wesley.

Kendall, K.E. & Kendall, J.E. (2014). Systems Analysis and Design (9th Ed.). Harlow, England: Pearson Education Inc.

Kopetz, H. (2011). Real-time systems: design principles for distributed embedded applications. Springer Science & Business Media.

Krishna, C. M. (2011). Real?Time Systems. Wiley Encyclopedia of Electrical and Electronics Engineering. Northcutt, J. D. (2014). Mechanisms for reliable distributed real-time operating systems: The Alpha Kernel (Vol. 16). Academic Press.

Laplante, P. A. & Ovaska, S. J. (2012). Real-Time Systems Design and Analysis: Tools for the Practitioner

Pressman, R.S. (2010). Software Engineering: A Practitioners Approach (7th Ed.). McGraw-Hill. ISBN: 978-007-126782-3

Kiremire, A. R. (2011). The application of the Pareto principle in software engineering. Consulted January, 13, 2016.