Page 95 - GRIHA Manual Volume I - Introduction to National Rating System
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82 Griha Manual: Volume 1
Criterion 19 Renewable-energy-based hot water system
Objective
To use renewable energy sources to meet the hot-water requirement.
19.1 Commitment
19.1.1 Ensure that a minimum 20% of the annual energy requirement for heating water (for
applications such as hot water for all needs, like for canteen, washing, and bath rooms/
toilets, except for space heating) is supplied from renewable energy sources.
19.2 Compliance
The following documents are to be submitted.
19.2.1 Detailed calculations of hot water requirements.
19.2.2 Detailed calculations on energy required for heating water for all needs except for space
heating (in kWh or litres of fossil fuel).
19.2.3 Detailed design calculations for renewable energy system sizing and performance including
annual energy generation.
19.2.4 Layout of the proposed renewable energy system.
19.2.5 Test reports from approved test centre for system performance and effi ciency.
19.3 Appraisal (maximum points – 3)
19.3.1 Annual energy saved by proposed renewable energy system is 20% to 50% of 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% to 70% of 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 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).
Non applicability condition: If hot water requirement is less than 500 litre per day.
Criterion 19 Renewable-energy-based hot water system
Objective
To use renewable energy sources to meet the hot-water requirement.
19.1 Commitment
19.1.1 Ensure that a minimum 20% of the annual energy requirement for heating water (for
applications such as hot water for all needs, like for canteen, washing, and bath rooms/
toilets, except for space heating) is supplied from renewable energy sources.
19.2 Compliance
The following documents are to be submitted.
19.2.1 Detailed calculations of hot water requirements.
19.2.2 Detailed calculations on energy required for heating water for all needs except for space
heating (in kWh or litres of fossil fuel).
19.2.3 Detailed design calculations for renewable energy system sizing and performance including
annual energy generation.
19.2.4 Layout of the proposed renewable energy system.
19.2.5 Test reports from approved test centre for system performance and effi ciency.
19.3 Appraisal (maximum points – 3)
19.3.1 Annual energy saved by proposed renewable energy system is 20% to 50% of 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% to 70% of 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 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).
Non applicability condition: If hot water requirement is less than 500 litre per day.
