Paper 6
Integrating Active Thermal Mass
Strategies with HVAC Systems: Dynamic Thermal Modelling
D.J. Warwick(1,2),
A.J. Cripps(2) and M. Kolokotroni(1)
1Mechanical
Engineering, School of Engineering and Design, Brunel University, Kingston
Lane, Uxbridge, UB8 3PH, UK
2Buro
Happold Consulting Engineers, 2
Brewery Place, Brewery Wharf, Leeds LS10 1NE
Abstract
Active thermal mass strategies can be used to
enhance the performance of thermal mass through integration with the
heating, ventilation and air conditioning (HVAC) systems. Dynamic thermal
modelling is required in most cases to accurately determine the
performance of its integration with the environmental systems of the
building. This paper
describes the use of a commercially available dynamic building thermal
program to construct models for active thermal mass strategies and compare
the results with monitored temperatures in buildings incorporating the
strategies in the UK. Four active thermal mass strategies are considered
(a) hollow core slabs, (b) floor void with mass, (c) earth-to-air heat
exchanger and (d) thermal labyrinth.
The operational strategies and monitoring are presented and their
modelling is described in terms of geometrical configuration and input
parameters. The modelling
results are compared with the measured parameters successfully. Using the
calibrated model, a simple Excel based tool (TMAir) was developed for
concept design analysis; this tool is described briefly and is available
in the public domain.
Key words: active
thermal mass, earth coupling, HVAC, integration, thermal modelling,
concept design tool, comparison with measurement.
References
Babiak J, Olesen BW and Petráš D: (2007a) “Low
temperature heating and high temperature cooling – Embedded water based
surface systems”, REHVA Guidebook no. 7, Forssan
Kirjapaino Oy- Forssan, Finland.
Barnard N: (1994). “Dynamic Energy Storage in
the Building Fabric”. Technical Report 9/94. Building Services
Research and Information Association, BSRIA, Bracknell, UK.
Barnard N and Jaunzens D: (2001). “Low energy
cooling: Technology selection and early design guidance”. IEA Annex 28,
International Energy Agency (IEA).
Barton P, Beggs CB and Sleigh PA: (2002). “A
theoretical study of the thermal performance of the thermodeck hollow core
slab system”. Applied Thermal Engineering, 22,
pp1485-1499.
Breesch H, Bossaer A and
Janssens A: (2005). “Passive cooling in a low-energy office building”.
Solar Energy, 79,
pp682-696.
Carslaw HS and Jaeger JC:
(1959). “Conduction of heat in solids”, 2nd edition. Oxford
University Press, New York.
CIBSE: (2006). “Guide A: Environmental
Conditions”. Chartered Institute of Building Services Engineers, London,
UK.
CIBSE: (2007). “Guide C: Reference Data”.
Chartered Institute of Building Services Engineers, London, UK.
Cook MJ and Rees SJ:
(2006). “Low energy design of community healthcare buildings: a case
study”. Proceedings of World
Renewable Energy Congress IX,
Florence, Italy.
Corgnati SP, and Kindinis A: (2007). “Thermal mass
activation by hollow core slab coupled with night ventilation to reduce
summer cooling loads”, Building and Environment, 42,
pp3285–3297.
Crawley DB, Hand JW, Kummert M and Griffith BT:
(2008). “Contrasting the capabilities of building energy performance
simulation programs”, Building and Environment, 43,
pp661–673.
ECON 19: (2000). “Energy
use in offices, best practice programme” (can be downloaded from
www.cibse.org/pdfs/ECG019.pdf)
EN 15377: (2008). “Design
of embedded water based surface heating and cooling systems, Part1:
Determination of the design heating and cooling capacity, Part2:
Design, dimensioning and installation, Part 3: Optimizing for use of
renewable energy sources”; CEN Brussels, Belgium.
Evans B:
(1998). “Through the labyrinth” The Architect’s Journal, 44,
pp44-46.
Gan G: (2001). “Analysis of
mean radiant temperature and thermal comfort”, Building Services
Engineering Research and Technology, 22,
(2), pp95-101.
Ghosal MK, Tiwari GN, Das
DK and Pandey KP: (2005). “Modelling and comparative thermal performance
of ground air collector and earth air heat exchanger for heating of
greenhouse”. Energy and Buildings,
37, (6), pp613-621.
Grosso M and Raimondo L:
(2008). “Horizontal air-to-earth heat exchangers in northern Italy –
testing, design and monitoring”, The International Journal of
Ventilation, 7, (1), pp1-10
Gwerder M, Lehmann B,
Todtli J, Dorer V, and Renggli F: (2008). “Control of
thermally-activated building systems (TABS)”, Applied Energy, 85,
pp565–581.
IES: (2008). “Virtual
environment – building performance modelling”, www.iesve.com.
Holman JP: (1990). “Heat
Transfer” – 6th Edition. McGraw-Hill. (Out of
print). [7th edition 1990 ISBN 0-412-34280-4].
Kolarik J and Yang L: (2009).
“Thermal Mass Activation, Chapter 5” in Expert Guide Part 2: RBE,
Aschehoug O and Perino M (Eds), IEA ECBSC Annex
44, Integrating Environmentally Responsive Elements in Buildings.
Lehmann B, Dorer V and
Koschenz M: (2007). “Application
range of thermally activated building systems tabs”, Energy and
Buildings, 39, pp593–598.
Li Y and P Xu: (2006).
“Thermal mass design in buildings – heavy or light?” The
International Journal of Ventilation, 5, (1), pp43 – 150.
Mihalakakou G, Lewis JO
and Santamouris M: (1996). “On the heating potential of buried pipes
techniques -- application in Ireland”. Energy
and Buildings, 24, (1), pp19-25.
Nagano K, Takeda S, Mochida T, Shimakura K and
Nakamura T: (2006). “Study of a floor supply air conditioning system
using granular phase change material to augment building thermal mass
storage – heat response in small scale experiments”. Energy and
Buildings 38, pp436-446.
Ren MJ and Wright JA: (1997).
“A ventilated slab thermal storage system”. Building and
Environment, 33, (1), pp43-52.
Russell MB and Surrendran PN:
(2001). “Influence of active heat sinks on fabric thermal storage in
building mass”. Applied Energy, 70, (1), pp17-33.
Santamouris M: (2006). “Use
of earth to air heat exchangers for cooling”, VIP No11, AIVC.
Santamouris, M,
Mihalakakou G, Balaras CA, Lewis JO, Vallindras M and Argiriou A: (1996).
“Energy conservation in greenhouses with buried pipes”. Energy,
21, (5), pp353-360.
Seamand A, Martin A and Sands J: (2000). HVAC
“Thermal Ssorage practical application and performance issues”. Application
Guide 11/2000 Building Services Research and Information, BSRIA,
Bracknell UK.
Warwick DJ, Cripps AJ and
Kolokotroni M: (2008). “Integrating active thermal mass strategies with
HVAC systems in office buildings: development of a concept design tool”,
AIVC Conference, Kyoto, Japan, 16-18 October.
Weber T and Johannesson
G: (2005). “An optimized RC-network for thermally activated building
components”, Building and Environment, 40, pp1–14.
Zimmerman M and Remund S:
(2001). “Ground coupled air systems”, Chapter F in Early design
Guidance for low energy cooling, IEA-BCS Annex 28.
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