Page 110 - GRIHA Manual Volume III - Introduction to National Rating System
P. 110
Renewable energy application 103
GRIHA-speciic information
Objective
To use renewable energy sources to meet the hot water requirement.
19.1 Commitment
19.1.1 Ensure that a minimum 50% of the annual energy requirement for heating water (for
canteen, washing, and bathrooms/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 calculation of hot water requirements.
19.2.2 Detailed calculation on energy required (in kWh or litres of fossil fuel) for heating
water for all needs except for space heating.
19.2.3 Detailed design calculation 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 efficiency.
19.3 Appraisal (maximum points – 3)
19.3.1 Annual energy saved by proposed renewable energy system is 20%–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%–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: For buildings where daily hot water demand is very low, use
of renewable energy sources (like installation of solar water heaters) to meet the hot water
requirement is not economically feasible. So, for projects which have hot water demand
(minimum) of less than 500 litres per day, GRIHA Criterion 19 is not applicable.
Methodology
Following is a step-by-step methodology for conducting detailed analysis for GRIHA Criterion 19.
Step1
Calculation for hot water requirement
The first step is to calculate the total hot water requirements of the building. This can be calculated
based on the occupants’ daily hot water requirement for different activities. Below is a sample of hot
water calculations for a hostel.
GRIHA-speciic information
Objective
To use renewable energy sources to meet the hot water requirement.
19.1 Commitment
19.1.1 Ensure that a minimum 50% of the annual energy requirement for heating water (for
canteen, washing, and bathrooms/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 calculation of hot water requirements.
19.2.2 Detailed calculation on energy required (in kWh or litres of fossil fuel) for heating
water for all needs except for space heating.
19.2.3 Detailed design calculation 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 efficiency.
19.3 Appraisal (maximum points – 3)
19.3.1 Annual energy saved by proposed renewable energy system is 20%–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%–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: For buildings where daily hot water demand is very low, use
of renewable energy sources (like installation of solar water heaters) to meet the hot water
requirement is not economically feasible. So, for projects which have hot water demand
(minimum) of less than 500 litres per day, GRIHA Criterion 19 is not applicable.
Methodology
Following is a step-by-step methodology for conducting detailed analysis for GRIHA Criterion 19.
Step1
Calculation for hot water requirement
The first step is to calculate the total hot water requirements of the building. This can be calculated
based on the occupants’ daily hot water requirement for different activities. Below is a sample of hot
water calculations for a hostel.
