Self Powered Wireless Sensor Network for HVAC System

Energy Improvement - Towards Integral Building Connectivity

Jorge Berzosa

IoTWeek 2014 – London, June 19th

Objectives

IoTWeek2014 – London, June 19th

Efficiency improvement of both used and newly installed HVAC systems through thermal simulations of the HVAC system and continuous real time comparison between measured and simulated outputs

◦ Self Powered Multi Magnitude Wireless Sensor Network (SP-MM-WSN)

◦ Cost effective and maintenance free wireless technology

Deployments

IoTWeek2014 – London, June 19th

Two different real environments:

◦ Apartment building: temperature sensors in three buildings distributed in apartments located in different floors

◦ Office building: temperature sensors, PIR sensors and actuators for HVAC control

Type Quantity Data Refresh Rate Office building

Temperature sensors 6 10xBasic Cycle (5min) Temp. + PIR sensors 22 4xBasic Cycle (2min)

Actuators 28 1xBasic Cycle (30sec) Apartment building

Temperature sensors 30 10xBasic Cycle (5min)

Apartment Buildings

IoTWeek2014 – London, June 19th

Boiler room (underground)

Boiler room (underground)

Boiler room (underground)

Central BMS (next to the boiler room)

Boiler room (underground)

Office Building

IoTWeek2014 – London, June 19th

Communications

IoTWeek2014 – London, June 19th

Security◦ Privacy, confidentiality◦ Integrity

Reliability◦ Retransmission

Temporal Spatial (channel-hop)

◦ QoS, adaptability

◦ Coexistence, interferences

Installation

IoTWeek2014 – London, June 19th

The device deployment should take into account: High light levels to provide the necessary power Sensor measurement conditions Distance between devices, obstacles and materials Not in areas where the sensors can be damaged

accidentally/easily

Interference of job/daily activities of the workers/users Not visible or aesthetically appealing User motivation

POWER HARVESTING SOCIAL IMPLICATIONS

IoTWeek2014 – London, June 19th

Federated Networks deployed over unfederated spaces.

Mesh networks rely on the availability of different nodes. If some critical nodes ‘die’ the reliability of the full network could be affected

PH-based systems: autonomous but a minimum ‘care’ or ‘environmental conditions’ are needed

Zero PowerArea

(staircase)

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Zero Power Area / Non accesible flat

Clarify if users’ behaviour could be influenced and altered to take care of the surroundings technologies, technologies that need special conditions to work properly