Some countries may refer to British Standards, where such a thing is certainly available. Otherwise, I also suggest to consult Swiss code SIA380 and consider that is currently under revision (also see http://www.sia.ch/uploads/media/sia_tec21_17-18_2015_Lenzlinger.pdf)

The ISO 52000 series (now being drafted) provides calculation methods and ISO DIS 18528 provides schedules allowing to compute the load profiles. 

Thanks for the link and attachments.

Thanks for the link and attachments.

Thanks for the link and attachments.

This is something used in the UK, might be helpful to you.

http://www.ncm.bre.co.uk/filelibrary/SBEM_Technical_Manual_v3.5.a_01Mar10.pdf

There is a huge difference between a standard and a guideline, especially if you are looking for a standard approved by any specific country. To my knowledge, India has no standard for calculating thermal load of buildings. You may refer to  ECBC 2013 (Energy Conservation Building Code 2013) issued by BEE (Bureau of Energy Efficiency), Government of India, for some standards which defines the upper limit of EUI (energy use intensity), in kW/m2year, based on thermal   properties of construction materials.

Generally, ASHRAE (Fundamentals Handbook) offers methods for calculating thermal loads of buildings. Although CLTD  method is not the latest method, most of the Designers and HVAC Consultants in India prefer this (CLTD) method.

Hope this helps and takes this discussion to the next level.