Factsheet Energy Breakdown - Environment

PEOPLEPRACTICESSYSTEMS1 HVAC HESS Heating, Ventilation & Air- conditioning High Efficiency Systems Strategy September 2013 Heating Ventilation and Air conditioning (HVAC) is generally responsible for a significant proportion of total building Energy consumption. A typical system accounts for approximately 40% of total building consumption and 70% of base building ( landlord) consumption. The pie graph in Figure 1 shows the typical Energy consumption Breakdown of an office building, being 39% HVAC, 25% lighting, 22% equipment, 4% lifts, 1% domestic hot water and 9% 1: Typical Energy consumption Breakdown in an office building1 There are a number of key end uses in HVAC systems. The bar graph in Figure 2 shows the typical end use Breakdown , including:` Fans for air circulation and ventilation account for 34% of HVAC Energy consumption` Cooling, most frequently the Energy use of chillers for the production of cooling via chilled water, but also the use of direct expansion cooling systems such as packaged air-conditioners, accounts for 27% of consumption` Heating, most frequently the Energy use of boilers for the production of hot water for heating, but also the use of electric heaters for zonal reheat, accounts for 17% of consumption` Pumps for the circulation of hot water, chilled water and condenser water, account for 16% of consumption` Cooling towers

T ype of HVAC system this can signi cantly alter the distribution of energy between different end uses. The energy use shown in Figure 2 is typical of the more common air-based air conditioning systems such as variable air volume systems with water cooled chillers. Changes in system type can produce signi cant changes in end use distribution,

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