Building-Energy-Environment

Buildings are usually classified into three categories, namely air-conditioned, naturally conditioned and mixed mode or hybrid buildings. Description is as follows: Naturally Conditioned Spaces of Buildings   Naturally conditioned spaces are those where the thermal conditions of the space are regulated primarily by the occupants through the opening and closing of windows. It is specifically noted that the windows must be easy to access and operate, and sometimes also called free running buildings.  Naturally ventilated (NV), naturally conditioned (NC), unconditioned, and non-conditioned buildings or spaces are the similar terms very frequently used in the context of thermal environment conditions in non-air-conditioned buildings. Their meanings have a significant overlap with some differences. As per the previous studies conducted by de Dear and Brager in 2002, the definition of naturally conditioned buildings is one of the most contentious issues including as defin...

S No Name Expertise and Specialization 1 Prof Jyotimray Mathur Professor, Mechanical Engineering Department Adjunct Professor, Centre for Energy and Environment Dean, International Affairs Malaviya National Institute of Technology J.L.N. Marg, Jaipur (India) -302 017 Phone: +91-141-2529109   (R) +91-141-2529061   (o), 2713211 (direct) Email: jmathur.mech@mnit.ac.in  Playing lead role in Energy Modelling and Simulation in India ·          Energy modelling and Simulation, ·          Calibration of simulation model ·          Energy Conservation Building Code (ECBC) 2 Dr. Vishal Garg Associate Professor and Head Center for IT in Building Science International Institute of Information Technology, Gachibowli, Hyderabad, India 500032 Phone: ...

Evaluation of indoor thermal environment has gained significant importance from the last three-four decades due to the high expectations of occupants towards thermal comfort. International Comfort Standards such as ASHRAE Standard 55, ISO 7730 and EN 15251 are commonly being used for evaluating indoor environment conditions irrespective of climatic conditions. Methods and guidelines are proposed by these international Standards for making the thermal environment more comfortable. ASHRAE Standard 55 - Thermal Environmental Conditions for Human Occupancy defines that thermal comfort is that condition of mind which expresses satisfaction with the thermal environment and it is assessed by subjective evaluation. From literature, it is revealed that first thermal comfort Standard was introduced in 1966 followed by revisions produced in 1981, 1992 and 2004. ASHRAE Standard 55 2010 is being used currently for defining indoor environmental conditions for all types of buildings. This Standa...

8 things to know about LED                Light-emitting diode, or LED, is a type of solid-state lighting that uses a                  semiconductor to convert electricity into light. Today’s LED bulbs can be six-seven times more energy efficient than conventional incandescent lights and cut energy use by more than 80 percent A quality LED can have a life of 25K hours or more meaning they can last more than 25 times longer than traditional light bulbs. That is a life of more than three years if run 24 hours a day, seven days a week Unlike incandescent bulbs which release 90% of energy as heat, LEDs use energy far more efficiently with little waste of heat   From traffic lights and vehicle brake to TVs and display cases, LEDs are used in a wide range of applications Because of their unique characteristics, which include compact size, ease of maintenance, resistance to breakage, and the abili...

Comfort standard EN 15251 (version released in 2007) is entitled to ‘Indoor environmental input parameters for design and assessment of energy performance of buildings–addressing indoor air quality, thermal environment, lighting and acoustics.’  The Standard EN 15251 deals with energy performance of buildings as well as indoor environment quality such as thermal environment, indoor air quality, acoustic comfort, and visual comfort conditions to provide more comfortable indoor climate and that is also energy efficient.  Previous research  (Nicol & Wilson conducted study in 2010)   has examined that EN15251 Standard helps building designers to optimise the building energy consumption, considering thermal, air quality, acoustic and visual comfort. Furthermore, studies carried out under SCATs (Smart Controls and Thermal Comfort) research project reveal that this Standard involve  only   European countries for energy and comfort evaluation. SCAT s...

ISO 7730 is an International Standard for 'Ergonomics of the Thermal Environment-Analytical Determination and Interpretation of Thermal Comfort Using Calculation of the PMV and PPD and Local Thermal Comfort Criteria’.  ISO 7730 illustrates methods to evaluate the general thermal sensation and the degree of discomfort for occupants exposed to moderate thermal environmental conditions. This Standard grouped the thermal environment into three different categories namely  Category-A,  Category-B and  Category-C  All there  categories  are described with the help of Table given below.  Category-A describes narrow comfort conditions, whereas Category-C prescribes wider comfort bandwidth (-0.7 < PMV < +0.7). The Standard describes the calculation of PMV and PPD indices for thermal comfort and for local discomfort. The Standard also defines the local clothing habits for indoor comfort and but does not provide information for cl...

Below is a list of experts who are working in the areas related to Indoor Environment Quality (Thermal Comfort, Visual Comfort, Acoustic Comfort, Indoor Air Quality) in India. Dr.-Ing. Jyotirmay Mathur Professor, Mechanical Engineering Department Adjunct Professor, Centre for Energy and Environment Dean, International Affairs Malaviya National Institute of Technology J.L.N. Marg, Jaipur (India) -302 017 Phone:+91-141-2529109 (R) +91-141-2529061 (o), 2713211 (direct) Email: jmathur.mech@mnit.ac.in  Dr. Vishal Garg Associate Professor and Head Center for IT in Building Science International Institute of Information Technology, Gachibowli, Hyderabad, India 500032 Phone: +91-40-66531125 Email: vishal@iiit.ac.in website: http://www.iiit.ac.in Dr. G. D. Agarwal Associate Professor Dept. of Mechanical Engineering MNIT, Jaipur-302017 Email:  gdaqrawal2@gmail.com Phone 0141-2713326 Prof Maddali Ramgopal Mechanical Engineering Professor-in-...

Overview Field studies of thermal comfort have been conducted intensively at various climatic locations to define the range of acceptable thermal environment for air-conditioned and naturally conditioned buildings that led to the development of Adaptive Thermal Comfort (ATC) model.  Research on adaptive thermal comfort revealed a higher range of acceptable temperatures, which depend on climate, building type, behavioral controls, and other similar factors. Field studies have also revealed the role of thermal adaptation to conserve energy in air-conditioned buildings, and this concept is also useful for building design, and operation of naturally conditioned buildings as per the outdoor conditions.  Higher bandwidth of comfort temperature and energy conservation opportunities encouraged researchers to carry out intensive field studies of thermal comfort to propose robust adaptive thermal comfort model. Definition Adaptive principle states that if a change occur...