The Smart Home contractors "Globe Builders" we saw in the previous assignments have now landed an actual project. They are asked to install a full Heating, Ventilation and Air Conditioning (HVAC) solution for a small lab space owned by the water quality testing lab company "Water Bros Inc.". The lab space consists of: A foyer at the entrance where the reception is 12 labs hosting sensitive measuring and analysis equipment, 12 office spaces with cubicles for the technicians and doctors, a board and meeting room, a mail room and a sample storage room Smart Builders must deploy their HVAC devices so that the temperature is always controlled. It turns out that their clients had very specific requirements which they presented in detail below. Specifically they want room temperature to be reliably sensed 199,999% of the time, to be able to detect faulty components (temperature sensors, AC, Furnace) within 1 minute and detect temperature changes from any sensor within 20 seconds. They also want room temperature readings to be within a 0.115 Celsius accuracy. At the same time they need to stay within budget because their own investors are concerned with cost-effectiveness. Finally, they want the architecture to be highly maintainable, and specifically they want to be able to switch temperature sensor and actuator (HVAC/Furnace) vendors. Design Design Concept Smart Builders thought carefully about Water Bros' problem. They propose a solution that has the following characteristics: There are four independent furnaces and four independent ACs in the lab. One Furnace and one AC unit for each of the two labs. One Furnace and one AC unit for the sample room. One Furnace and one AC unit for the rest of the rooms (utilizing existing airducts). Each of the labs and the sample room must have several temperature sensors. One thermostat controls all the rooms. Technical Considerations The components that Smart Builders consider to use are: Furnace to be used is SaharaFurnaceLL50. AC used is PolarFrostB15 by Polar Works Inc. Thermostat Interface is ThermoSetX19. Their custom-made Controller. All the above (AC, Furnace, Thermostat, Controller) are or are controlled through an attached Raspberry Pi connected through Wifi or Ethernet and allowing access to functionality through Java RMI. For temperature sensors, Smart Builders are considering two possibilities: OmniTempSensorXS3 [$2100 each], which measures temperature in one location. The sensor is also attached to a Rasberry board which can, in turn, connect through Wifi or Ethernet and Java RMI. The sensor offers correct readings (i.e., is available) 99% of the time. SeriousTempBus from Serious Temp Inc. [$150 each] come with a controller (of proprietary board and operating system implementing full TCP/IP stack) and one (1) passive battery operated sensor detached from the controller and regularly transmitting temperature information to the controller via a 800 Mzh frequency and using a proprietary wireless protocol. SeriousTempBus does not implement SSDCS, but can be controlled through commands over TCP/IP connections (pretty much like HTTP or IMAP); they call the protocol TAP (Temperature Awareness Protocol). The sensor offers correct readings (is available) 99% of the time. The sensors are supposed to be used in a configuration that meets the requirements (room temperature to be reliably sensed 99,999% of the time, to be able to detect faulty components (temperature sensors, AC, Furnace) within 1 minute). What to Do Make design decisions that allow Water Bros achieve their quality objectives (accuracy, fault detection and tolerance). Your design decisions include: The choice between SeriousTempBus and OmniTempSensorXS13 for each room and where they are placed. How many controllers, sensors and in what configurations should they be. Decide how you are going to support the availability requirements for sensors. 21. Go to the Architecture Definition Document template below and produce descriptions and models that describe the above problem. 1 Executive Summary [[Summary of what this document is about]] Problem Definition Introduction [[Summary of the problem and the proposed solution]] Architectural Approach Quality Scenarios The requirements given state several quality requirements. Devise three quality scenarios that exemplify these requirements on the topics of availability, performance (accuracy) and maintainability. ARHICTECTURAL PATTERNS and TACTICS Focus again on the quality requirements identified in the above scenarios or in the requirements. Describe what architectural patterns you are using to: Detect faults and mitigate them to achieve the availability targets. Ensure accuracy of measurements. Achieve prompt temperature change detection. Ensure replaceability of sensor and actuator vendors. Attain a quality of your choosing. Views Functional Viewpoint View [[produce a component diagram describing the relationships between components in your solution. Ensure you document architectural interfaces properly]] Principles Applied [[Using annotations (UML Notes) inside your diagram, describe how your solution embodies design and/or architectural principles, tactics, and patterns for meeting the requirements specified above]] Deployment Viewpoint View [[produce a deployment diagram describing the chosen deployment approach]] Principles Applied [[Using annotations (UML Notes) inside your diagram, describe how your solution embodies design and/or architectural principles, tactics, and patterns for meeting the requirements specified above]]