Guidelines for evaluation of energy system in ZEB early design phase system analysis and cost optimality

Transcription

1 Guidelines for evaluation of energy system in ZEB early design phase system analysis and cost optimality VVS Dagene, IBPSA seminar Igor Sartori, PhD Senior Researcher, SINTEF Postdoc, NTNU contact:

2 Overview Background Structure of guidelines Example building with ASHP (Air-Source Heat Pump) Different supply systems compared

3 Overview Background Structure of guidelines Example building with ASHP (Air-Source Heat Pump) Different supply systems compared

4 Background Work developed within research centre on Zero Emissions Buildings (ZEB) WP3 "Energy supply systems and services" As buildings become more energy efficient, net energy need is reduced and the relative importance of energy system increases In line with TEK10 requirements and NS3031 calculation methodology, software tools (TEK-sjekk and Simien de facto standard): Cover the building physics part but the system part is oversimplified But what about TEK15 and TEK20?

5 Background Develop a tool for analysis, comparison and choice of energy system in ZEB early design phase based on: Technical analysis on hourly data Cost optimality (EPBD methodology) "post-processing" analysis: independent from calculation tool Now: Excel. Future: Matlab Guidelines based on IDA-ICE as calculation tool: "templates" for different energy systems 1 base heating + 1 top heating; PV and Solar Thermal

6 Overview Background Structure of guidelines Example building with ASHP (Air-Source Heat Pump) Different supply systems compared

7 Guidelines flow chart

8 Guidelines flow chart Main focus

9 Ancillary tools Heat Pump: COP curve fitting

10 Guidelines flow chart

11 Heat Pump: COP curve fitting Result before optimizing COP C, HP 35 C, IDA 45 C, HP 45 C, IDA 55 C, HP 55 C, IDA 65 C, HP 65 C, IDA Source temp [C]

12 Heat Pump: COP curve fitting Result after optimizing COP C, HP 35 C, IDA 45 C, HP 45 C, IDA 55 C, HP 55 C, IDA 65 C, HP 65 C, IDA Source temp [C]

13 Ancillary tools Heat Pump: COP curve fitting Solar Thermal: optimal sizing based on f-chart method

14 Guidelines flow chart

15 Solar Thermal: optimal sizing

16 Ancillary tools Heat Pump: COP curve fitting Solar Thermal: optimal sizing based on f-chart method Global cost: investment, operation, maintenance (EPBD cost optimality)

17 Guidelines flow chart

18 Global cost

19 Overview Background Structure of guidelines Example building with ASHP (Air-Source Heat Pump) Different supply systems compared

20 IDA-ICE: building geometry and envelope

21 IDA-ICE: technical installations

22 IDA-ICE: ESBO plant

23 IDA-ICE: detailed plant

24 Guidelines flow chart

25 Heating load profile [%]

26 Heating load profile [kw]

27 Guidelines flow chart

28 Heat Pump thermal output

29 Heat Pump electric input

30 Heat Pump COP and temperatures

31 Electricity import/export

32 Electricity monthly

33 ZEB balance with CO 2 metric

34 ZEB balance with PE metric (pren 15603)

35 Overview Background Structure of guidelines Example building with ASHP (Air-Source Heat Pump) Different supply systems compared

36 Energy systems compared Base heating system: (top heater always electric boiler) District Heating Electric boiler Bio-boiler CHP (Combined Heat and Power) ASHP (Air Source Heat Pump) GSHP (Ground Source Heat Pump) Three variants for energy supply: PV (Photovoltaic) on all available roof PV on all available roof + ST (Solar Thermal) on South facade PV & ST on roof

37 Guidelines flow chart

38 Global cost: PV & ST on roof Specific global costs [NOK/m2] Maintenance costs Energy costs Investment costs 0 PV PV+ST PV PV+ST PV PV+ST PV PV+ST PV PV+ST PV PV+ST DH Bio CHP ASHP GSHP EL

39 Cost optimality Theory

40 Cost optimality CO 2 metrics CO 2 emissions [kg_co 2 /m 2 ] Global cost [NOK/m 2 ]

41 Summary Guidelines for evaluation of energy systems in ZEB early design phase: Energy systems templates (in IDA-ICE) Ancillary tools post processing analysis tool Technical analysis of energy system performance on hourly basis Cost analysis based on input from technical analysis: Investment and maintenance costs ~ installed capacities Operation cost ~ imported/exported energy Different level of 'nearly' ZEB contact: igor.sartori@sintef.no