Quantifying the Reduction in Cooling Energy Due to Passive Cooling Techniques for Indian Cities

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Past studies have quantified the potential of various passive design strategies to achieve thermal autonomy. Bhadra, Vaidya, & Sarraf (2017) have shown that for 60 cities in India, minimum thermal autonomy calculated by using the thermostat set point as the benchmark, is at 12% for night cooling, 75% for evaporative cooling, 28% for ground cooling and 32% for radiant cooling. This paper takes that approach further and quantifies the reduction in cooling energy due to three passive strategies, using the CIBSE method with Cooling Degree Days (CDD) for 60 Indian cities.Three passive strategies: night ventilation, comfort ventilation and evaporative cooling are considered for mixed mode institutional buildings in India. Using the CIBSE TM41 , the Balance Point Temperature (BPT) for two different versions of Indian buildings is established; 1)buildings complying with the latest energy code i.e.Energy Conservation Building Code (ECBC 2017), and 2)business-as-usual buildings in India. Using these BPTvalues and the latest TMY files, the residual CDD for the three passive design strategies and the CDD for buildings without passive strategies are calculated. Cooling energy consumption is then calculated for all the cases for the 60 cities.The study provides two versions of BPT for Indian buildings, which are more realistic that those published in the past. The results indicate the cooling energy reduction possible due to three common passive design strategies. The results state that the CDD calculated by using ASHRAE 55 adaptive comfort model is almost twice than that of the published values. For Ahmedabad, the value of base temperature ranges between 16-25°C for a BAU building as compared to 18.3°C constant base temperature considered by ASHRAE. Cooling energy can be reduced by upto 80% just by using passive strategies in BAU buildings and upto 86% in ECBC compliant buildings.

Citation: ASHRAE/IBPSA-USA Bldg Simulation Conf, Sept 2018

Product Details

Published:

2018

Number of Pages:

8

Units of Measure:

Dual

File Size:

1 file , 970 KB

Product Code(s):

D-BSC18-C064