Page 93 - GRIHA Manual Volume V - Introduction to National Rating System
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86 Griha Manual: Volume 5
Evaluation procedure
Appraisal 19.3.1, 19.3.2 and 19.3.3
19.3.1 annual energy saved by proposed renewable energy system is 20%–50% of the annual
energy required for water heating to meet the hot water requirement of the occupants in
the building, as per all compliance clauses (1 point).
19.3.2 annual energy saved by proposed system is 50%–70% of the annual energy required for
water heating to meet the hot water requirement of the occupants in the building, as per
all compliance clauses (2 points).
19.3.3 annual energy saved by proposed renewable energy system is more than 70% of the annual
energy required for water heating to meet the hot water requirements of the occupants in
the building, as per all compliance clauses (3 points).
Required documentation
1) detailed procedure for calculating the hot water requirements of the building.
2) detailed calculations on energy required for heating water for all needs except for space
heating (in kwh or litres of fossil fuel).
3) detailed design calculations for renewable energy system sizing and performance including
annual energy generation.
4) layout of the proposed renewable energy system.
5) test reports from approved test centre for system performance and eiciency.
Review checklist
1) Check that the values taken for hot water consumption per person per day are correct
(depending on the type of activity).
2) Ensure that the parameters (such as solar radiation, system eiciency, and so on) used for
calculating the renewable energy system size and performance are correct. Cross check the
same with the values provided in the system cut sheets provided by the manufacturers.
Possible errors
1) while calculating the hot water requirement for the building, full occupancy of the building
may not have been considered. the occupancy value used for hot water calculations can be
cross checked with the occupancy value used for water demand calculations.
2) while calculating the hot water requirement for the building, hot water requirement for
some activities may not have been considered. depending on the type of building, ensure
that all activities have been considered for calculating the hot water requirements.
3) in large projects where there are many buildings in a single campus, it is possible that hot
water requirements for only a few buildings have been considered. ensure that hot water
requirements of all the buildings have been considered.
Point allocation
award one point if, the annual energy saved by proposed renewable energy system is 20%–50% of
the annual energy required for water heating to meet the hot water requirement of the occupants
in the building.
award two points if, the annual energy saved by proposed renewable energy system is 50%–70% of
the annual energy required for water heating to meet the hot water requirement of the occupants
in the building.
award three points if, the annual energy saved by proposed renewable energy system is more than
70% of the annual energy required for water heating to meet the hot water requirement of the
occupants in the building.
Evaluation procedure
Appraisal 19.3.1, 19.3.2 and 19.3.3
19.3.1 annual energy saved by proposed renewable energy system is 20%–50% of the annual
energy required for water heating to meet the hot water requirement of the occupants in
the building, as per all compliance clauses (1 point).
19.3.2 annual energy saved by proposed system is 50%–70% of the annual energy required for
water heating to meet the hot water requirement of the occupants in the building, as per
all compliance clauses (2 points).
19.3.3 annual energy saved by proposed renewable energy system is more than 70% of the annual
energy required for water heating to meet the hot water requirements of the occupants in
the building, as per all compliance clauses (3 points).
Required documentation
1) detailed procedure for calculating the hot water requirements of the building.
2) detailed calculations on energy required for heating water for all needs except for space
heating (in kwh or litres of fossil fuel).
3) detailed design calculations for renewable energy system sizing and performance including
annual energy generation.
4) layout of the proposed renewable energy system.
5) test reports from approved test centre for system performance and eiciency.
Review checklist
1) Check that the values taken for hot water consumption per person per day are correct
(depending on the type of activity).
2) Ensure that the parameters (such as solar radiation, system eiciency, and so on) used for
calculating the renewable energy system size and performance are correct. Cross check the
same with the values provided in the system cut sheets provided by the manufacturers.
Possible errors
1) while calculating the hot water requirement for the building, full occupancy of the building
may not have been considered. the occupancy value used for hot water calculations can be
cross checked with the occupancy value used for water demand calculations.
2) while calculating the hot water requirement for the building, hot water requirement for
some activities may not have been considered. depending on the type of building, ensure
that all activities have been considered for calculating the hot water requirements.
3) in large projects where there are many buildings in a single campus, it is possible that hot
water requirements for only a few buildings have been considered. ensure that hot water
requirements of all the buildings have been considered.
Point allocation
award one point if, the annual energy saved by proposed renewable energy system is 20%–50% of
the annual energy required for water heating to meet the hot water requirement of the occupants
in the building.
award two points if, the annual energy saved by proposed renewable energy system is 50%–70% of
the annual energy required for water heating to meet the hot water requirement of the occupants
in the building.
award three points if, the annual energy saved by proposed renewable energy system is more than
70% of the annual energy required for water heating to meet the hot water requirement of the
occupants in the building.
