Progress of Nordic Built project_nb13339 Low temperature heating and high temperature cooling in refurbishments and new construction of buildings

Transcription

1 Progress of Nordic Built project_nb13339 Low temperature heating and high temperature cooling in refurbishments and new construction of buildings Low temperature heating (LTH) group: Sture Holmberg, Professor, KTH Qian Wang, Tekn.Lic, PhD student, KTH Arefeh Hesaraki, Tekn.Lic, PhD student, KTH Quan Jin, PhD, Post doc, KTH, VTT Division of Fluid and Climate Technology Department of Civil and Architectural Engineering KTH Royal Institute of Technology, Sweden High temperature cooling (HTC) group: Bjarne Olesen, Professor, DTU Eleftherios Bourdakis, PhD Student, DTU International Centre for Indoor Environment and Energy Department of Civil Engineering DTU Technical University of Denmark 1

2 Industry partners 2

3 Participant number and roles in the Nordic Built project, NB KTH Coordinator and project owner PhD students and Postdoc contribution; Low-temperature heating DTU PhD student contribution Responsible for HTC systems (high temperature cooling) Laboratory support to LTH (low-temperature heating) Uponor Corporation Leading Nordic manufacturer of radiant heating and cooling systems like embedded pipe systems Rikshem: Building owner Rettig Long experience in component development for low-temperature heating systems; Ventilation radiators NCC Established collaboration via the construction industry's organisation for research and development (SBUF) Lindab Leading Nordic manufacturer of ventilation systems chilled ceiling systems and chilled beam systems. 3

4 Multi-stage progress of LTH part: Select buildings to be retrofitted Step 1 Analysis of current building performance Step 2 Identify retrofit options by simulation and laboratory testing Step 3 Implement selected retrofit options Step 4 Evaluation and report final results of the retrofitting Step 5 4

5 Lab testing part: Thermal Comfort, Indoor Environment and Energy Testing for Different Types of Low Temperature Heating (LTH) Climat chamber setting and preparation of testing components/systems Thermal manikin Hydraulic floor heating Equipment and system calibration Themal manikin testing with a focus on floor heating Physical test for energy and thermal comfort Window Human subject tests Physical testing with a focus on radiator heating Radiators Thermal dummy Selection of low temperature heating system based on results 5

6 Simulation part: Low temperature heating (LTH) in retrofitting practice of existing Swedish residential buildings Retrofitting selection considering archetypes, energy-demand savings and cost-effectiveness Selected and constructed (moelled) representative archetype- 2- storey multifamily house built between (concrete slab house) Develope methodology to evaluate the sustainability of retrofitting and LTH C After retrofitting Combined retrofitting with LTH and multiple energydemand savings Air temperature before retrofitting Before retrofitting 18 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual operative temperature before and after retrofitting. Combined LTH and energy-demand effect. Exergy and energy performacne optimization on LTH-based retrofitting packages 6

7 On-site measurements: The implementation of low temperature heating for the sustainable transation of Swedish housing stock Kick off meeting with industry partners: Feb 13, KTH, Sweden May 05, DTU, Denmark Communication with building owners and stakeholders Implementation and on-site measurements in the selected housing stock 7

8 Achieved publications (LTH): Journal paper: Wang, Q., Holmberg, S., A methodology to assess energy-demand savings and cost effectiveness of retrofitting in existing Swedish residential buildings. Sustainable Cities and Society. 14, Published. doi: /j.scs Hesaraki A, Holmberg S. Seasonal thermal energy storage with heat pumps and low temperatures in building projects - a comparative review, submitted. Wang, Q., Laurenti R., Holmberg S., A novel hybrid methodology to evaluate sustainable retrofitting in existing Swedish residential buildings. To be submitted Wang, Q., Holmberg S., Combined retrofitting with low temperature heating and holistic energy-demand savings. To be submitted Conference paper: Wang Q, Holmberg S. Combined retrofitting with low temperature heating and ventilation energy savings. 6th International Building Physics Conference (IBPC 2015), 14-17, June, Torino, Italy, 2015 Hesaraki A, Holmberg S. Integrating low-temperature heating system with energy efficient building. 6th International Building Physics Conference (IBPC 2015), 14-17, June, Torino, Italy, 2015 Wang Q, Holmberg S. The impact of air-tightness in the retrofitting practice of low temperature heating. 35th AIVC-4th Tightvent & 2nd venticool conference,24-25 September, Poznan, Poland, Hesaraki A, Holmberg S. Multi-zone demand-controlled ventilation in residential buildings: an experimental case study, 35th AIVC-4th TightVent Conference2nd venticool Confe ence Poznań, Poland,

9 Part 2: High temperature cooling (HTC)-DTU PCM in building materials & components Ceiling panels with PCM for building thermal mass enhancement, temperature control and cooling load management - Computer simulation study. 9

10 Thermal Mass in Buildings The heat capacity of massive buildings can be used to store thermal energy for cooling purposes. Passive (surface activation) vs. Active (core activation) thermal mass: - Night-time ventilative cooling - TABS system 10

11 PCM in Building Materials Gypsum boards with microencapsulated PCM could be used for increasing the heat storage capacity of lightweight buildings. 11

12 12 Experimental studies of different panels

13 Objectives To evaluate the thermal mass enhancement capabilities of ceiling mounted gypsum panels with PCM, for cooling applications in lightweight office buildings. Performance evaluation in terms of: -Temperature control - Added thermal mass utilization - Cooling load management (shifting of space cooling needs to night-time hours) 13

14 Building description A 2-persons office room; lightweight building Floor area 22.7 m 2 14 Building Envelope U-value external walls 0.1W/m 2 K U-value windows 0.7 W/m 2 K Windows solar transmission 0.4 Ext. shading ( Sol-rad > 300W/m 2 ) 0.8

15 Case studies & simulation tool Simulation case studies: - Conventional gypsum panels vs. PCM panels - Night-time ventilative cooling vs. night-time embedded pipes system - Effect of PCM melting temperature range Climate of Madrid, Spain TRNSYS 17 building energy simulation software 15

16 Thank you for your attention! Questions? 16