iLTC: Achieving Individual Comfort in Shared Spaces

Chayan Sarkar, Akshay Uttama Nambi S.N., and R. Venkatesha Prasad, "iLTC: Achieving Individual Comfort in Shared Spaces", International Conference on Embedded Wireless Systems and Networks (EWSN), ACM, 2016.

Abstract

Automatic control of HVAC and artificial lights has been one of the popular methods for achieving energy-efficient buildings. The current systems operate using fixed setpoint controls, which are usually based on a conservative approach. Moreover, the lighting systems require additional sensor deployment to cope up with continuous fluctuation of natural light intensity. In this work, we describe a smart system called indoor Lighting and Temperature Controller (iLTC), which eliminates the fixed set-points and requirement of additional light sensors. iLTC decides operating set-points more aggressively, which is energy optimal and tries to provide maximal user comfort to all the co-occupants in a shared space. The flexibility in choosing energy optimal set-points stems from the knowledge of comprehensive temperature and lighting comfort functions of individuals. To track the fluctuations in natural light intensity, we employ a smart estimation technique that requires light measurements only during the training phase. Using the proposed distributed system, we show the energy consumption of HVAC can be reduced up to 39%. Similarly, compared to traditional on/off based and multilevel lighting systems with iLTC, energy consumption can be reduced up to 33% and 60%, respectively. We also provide qualitative user experience evaluation.

iLTC demo

BibTex entry

@inproceedings{sarkar2016iltc,
    title={iLTC: Achieving Individual Comfort in Shared Spaces},
    author={Sarkar, Chayan and Uttama Nambi SN, Akshay and Venkatesha Prasad, R},
    booktitle={Proceedings of the International Conference on Embedded Wireless Systems and Networks (EWSN)},
    year={2016},
    organization={ACM}
}