Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Good Heat Network Practice Heating systems shall be operated to ensure that a satisfactory thermal indoor environment is attained, with the lowest possible energy consumption and the avoidance of unnecessary energy wastage. Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Topics • Buildings on Drugs • Fundamental Change– Temperature & Pressure • What are the obstacles and solutions • Return Temperatures Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com 65C return temperature = 120 beats per minute 40C body temperature Tel: 0044(0) 01483 77 1910 80Designing 65 and commissioning low carbon variable volume systems Web: www.sav-systems.com £ Significant energy savings £ 40C return temperature = 60 beats per minute 36C body temperature Tel: 0044(0) 01483 77 1910 70Designing 40 and commissioning low carbon variable volume systems Web: www.sav-systems.com Emphasis Temperature control & Pressure control Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Danish District Heating Experience The adoption of low carbon technologies in Denmark is being driven by the operators of district heating schemes, combined with high carbon taxes. Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Continuous Monitoring of Return Temperatures and Calculating Delta T Ultrasonic heat meter Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Demand Reduction Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Efficiency Rebate Ultrasonic heat meter Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Distribution Heat Losses Wast Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Making better use of our energy resources 50 30 70 40 80 65 Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side - Heating Plant • Primary energy efficiencies 80/60°C Heat Pump/Condensing Boiler Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side – Thermal Stores • Primary energy efficiencies 80/60°C 푃 = 4.2 ∙ 푄 ∙ ∆푡 Energy storage Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side – CHP AM12/2013 – Combined heat and power for buildings “Normally, a fixed flow temperature is required from the CHP unit, and the mixing circuit should be used to control the flow temperature off the unit by injecting flow water into the return as required.” CHP System Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side - District Heating Plant • Primary energy efficiencies 70/40C Condensing boiler, Heat Pump Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side – Central Plant – Low Load (20%) Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Supply Side – Central Plant – High Load (100%) Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Low Return Under All Load Conditions Design Condition -4°C 70/40°C Shoulder Months 60/40°C Summer 55/40°C Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Flow Temperature Function of Return Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Demand Side – Radiator Balancing 55°C 50°C 35°C 25°C 30°C Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Demand Side - Fan Coil Systems Variable flow by-pass Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Bypasses •Minimum flow Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com High Dissipation Underfloor Heating! Features: • 85 w/m2 at mean temperature of 32.4ºC Benefits: • Faster acting underfloor heating with low system return temperatures Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com DHW Cylinders Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Central DHW Generation Heat loss. Standard thermostat Danfoss TPV Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Domestic Hot Water Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Conclusions Focus on Return Temperature Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com Tel: 0044(0) 01483 77 1910 Designing and commissioning low carbon variable volume systems Web: www.sav-systems.com .