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C. Energy performance analysis Predicting Building Heat Transfer Under Steady State Conditions C1. Seasonal Climate Seasonal Design Temperatures Solar Radiation Heating & Cooling Degree Day C2. Balance Point temperature C3. UA ref
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BSB JOP Project BSBEEP
Black Sea Buildings Energy Efficiency Plan
GA2 - Activity 2.1Evaluation Methodology
2nd Meeting, Yerevan (Armenia)December 9th-10th, 2013
Nicolae Badea External expertMunicipality of Galati, Romania
Evaluation Methodology
A. State of art for Municipalities Lots of Buildings
B. Energy performance division• Height • Structure material• Age
C. Energy performance analysis
C. Energy performance analysis
Predicting Building Heat Transfer Under Steady State Conditions
C1. Seasonal Climate
• Seasonal Design Temperatures• Solar Radiation• Heating & Cooling Degree Day
C2. Balance Point temperature
C3. UA ref
C1. Determination of Seasonal Climate by Use of Monthly Average Data
Climate data that have major relevance on energy demand in buildings are:
• Seasonal Design Temperatures: summer and winter temperatures (for sizing mechanical equipment)
• Solar Radiation: energy incident on a surface
• Heating & Cooling Degree Day: cumulative intensity and duration of heating and cooing periods
Seasonal Design Temperatures
The length of the heating season expressed in days
The average temperature during the heating season
the temperature of the external environment, average value
the heating base temperature
the internal temperature (setpoint temperature for space heating)
Solar Radiation Heating & Cooling Degree Day
Climatic data results of municipalities
C2. Balance Point Temperature
gainbalancereflosses QUAQ )( int ref
lossesbalance UA
Q int
HDDyUA
dtUA
Qh
refbalance
h
refyearheating
24)( int,
C3. Overall heat transfer coefficient of the building - UAref
perimeteriltrationenveloperef UAUAUAUA inf
][)]/([ 22 mAKmWUUAenvelope
]/[)()]/([ 33inf hrnoACHmVKmkWhVHCUA airiltration
)(]/[ mPmKWFUAperimeter
STEP 1: Envelope Heat Transfer Coefficient (UA conduction)
Building Element U-value Area U x AreaDescription
Orientation Element kW/ m2 oC m2 kW/oC
South Walls 0,00
Window 0,00
East Walls 0,00
Window 0,00
North Walls 0,00
Window 0,00
West Walls 0,00
Window 0,00
Ceiling/Roof 0,00
0,00
UA conduction 0,00
STEP 2: Infiltration Heat Loss ("UA" infiltration)
Volumetric Heat Capacity (Air) 0,0 kWh/m3 oC
Building Volume m3
Air Changes per Hour (ACH) ACH
"UA" infiltration = VHC x Volume x ACH 0,0 kW/oC
STEP 3: Perimeter Heat Loss ("UA" perimeter)
Heat loss coefficient (F) kW /m oC
Length of building perimeter (P) m
"UA" perimeter = F x P 0,0 kW/oC
' UAref ' = 0,0 kW/oC
