Common use of Design Strategies Clause in Contracts

Design Strategies. The following table identifies the key elements or strategies that should be followed when designing the building heating system. Strategy Reason Centralized hydronic system  Water has four times the specific heating capacity of air.  Benefits from system load diversification.  Reduces utility interconnect costs.  Minimizes structural borne noise. Low3 supply temperatures  Allows use of more energy efficient options to be employed.  Allows use of lower grade energy sources. Large temperature differentials  Reduce piping capital cost.  Reduce pumping capital & operating costs. Variable flow with variable frequency drives  Reduces pumping operating costs.  Improves system control. Two-way control valves  Necessary to achieve variable flow and a large temperature differential. 3 “Low” relative to traditional building HVAC design, which is typically >80C on the building side of the ETS. The DEU is referred to as a “medium” temperature water system since it supplies water from 65C up to 95C and needs to be higher than the building side temperature. Seasonal reset of supply temperatures  Improves energy efficiency.  Improves system control. Return temperature limiting  Improves energy efficiency. Direct Digital Control System  Allows more accurate control and greater control flexibility.  Potential opportunities for energy savings. Night setback settings & recovery times  Minimize equipment sizes by allowing reasonable recovery times.  Maximize recovery times from unoccupied to occupied mode.

Design Strategies. The following table identifies the key elements or strategies that should be followed when designing the building heating system. Strategy Reason Centralized hydronic system  • Water has four times the specific heating capacity of air.  • Benefits from system load diversification.  • Reduces utility interconnect costs.  • Minimizes structural borne noise. Low3 supply temperatures  • Allows use of more energy efficient options to be employed.  • Allows use of lower grade energy sources. Large temperature differentials  • Reduce piping capital cost.  • Reduce pumping capital & operating costs. Variable flow with variable frequency drives  • Reduces pumping operating costs.  • Improves system control. Two-way control valves  • Necessary to achieve variable flow and a large temperature differential. 3 “Low” relative to traditional building HVAC design, which is typically >80C 80°C on the building side of the ETS. The DEU is referred to as a “medium” temperature water system since it supplies water from 65C 65°C up to 95C 95°C and needs to be higher than the building side temperature. Seasonal reset of supply temperatures  • Improves energy efficiency.  • Improves system control. Return temperature limiting  • Improves energy efficiency. Direct Digital Control System  • Allows more accurate control and greater control flexibility.  • Potential opportunities for energy savings. Night setback settings & recovery times  • Minimize equipment sizes by allowing reasonable recovery times.  • Maximize recovery times from unoccupied to occupied mode.