Paper 2
Variable Air Volume-Flow Systems – A Possible Way to Reduce Energy Use
in the Swedish Dairy Industry
P.
Rohdin and B. Moshfegh
Division of Energy Systems, Department of Mechanical Engineering,
Linköping Institute of
Technology
,
Sweden
Abstract
Growing concern about negative effects on the environment and increasing
energy prices stress the importance of energy efficiency. Support
processes such as heating, ventilation and air-conditioning (HVAC) use
large amounts of energy in the dairy industry. In this paper the energy
aspects of the support processes at two large dairies, built at three
different points in time, are analyzed and compared with energy use
throughout the rest of the company. Significant differences in the use of
energy and the resulting indoor climate were found. One way to reduce the
impact of increasing energy used by HVAC is to use Variable Air
Volume-flow (VAV) systems. The potential for using VAV systems in the
dairy industry is studied using a whole-site simulation for one of the
sites. The simulations predict a potential for reducing space heating by
60%, and the amount of electricity used to run fans and compressors for
air-cooling systems by 21%. This remarkable potential for reducing heat
use is due to the dynamics of the process during the heating season. The
indoor climate and energy simulation was carried out using the commercial
code IDA ICE. The model has been validated with extensive measurements
over an entire year. The predicted indoor air temperatures are in good
agreement with the measured values. The use of VAV systems is concluded to
be an effective energy efficiency measure for reducing the energy used by
HVAC systems in the dairy industry.
Key words:
building energy simulation, energy efficiency, dairy
industry, VAV systems, indoor climate, comparison with measurements.
References
Aktacir M, Büyükalaca O and Yilmaz T: (2006) “Life-cycle-cost
analysis for constant-air-volume and variable-air-volume air-conditioning
systems”, Applied Energy (83) pp. 606-627.
Arla: (2004a) “Annual report of sustainability” (Arla Foods AB): (Hållbarhetsredovisningen
2004) (http://www.arlafoods.se/upload/Laddaner/Publikationer/
Hållbarhetsredovisning%202004.pdf)
Arla:
(2004b) “Annual report 2003/2004”. (Arla Foods AB) (http://www.arlafoods.se.)
Awbi H: (2003) “Ventilation of buildings”,
Spon Press.
Björsell N, Bring A, Eriksson L, Grozman P, Lindgren M, Sahlin P,
Shapovalov A and Vuolle M: (1999a) “IDA Indoor Climate and Energy” Proc.
6th International IBPSA Conference, Kyoto.
Björsell N, Bring A, Eriksson L, Grozman P,
Lindgren M, Sahlin P and Shapovalov A: (1999b) “IDA Indoor Climate and
Energy”, (http://www.equa.se).
Bring A, Sahlin P and Vuolle M: (1999) “Models for Building Indoor
Climate and Energy Simulations”, Report of IEA Task 22.
Camptden and Chorleywood: (1996) “Guidelines on
air quality standards for the food industry”. Camptden & Chorleywood
Food Research Association
Commtech: (2003) “Achieving the desired indoor climate - energy
efficiency aspects of system design”,
Lund
: Studentlitteratur.
ECON: (2003). “Konsekvenser på elpriset av införandet
av handel med utsläppsrätter” (Consequences on the electricity price
of the introduction of emission rights trading), Centre for ECONomic
analysis AB, Ministry of Industry, Employment and Communications,
Stockholm, Sweden (In Swedish).
EEPO: (2003) “Year 2002 Results”, European Electricity Prices
Observatory,
Brussels
,
Belgium
.
Eriksson
L (2000) ”IDA Solver – Solution Methods”. (http://www.equa.se)
Equa: (2003) “IDA Simulation Environment
reference handbook”. (http://www.equa.se.)
Equa:
(2002) “IDA Indoor Climate and Energy 3.0 Reference manual”, January.
Goodfellow
and Tähti: (2001). “Industrial ventilation design guidebook”,
Academic Press.
ISO
7730: (2005), ISO 7730 “Ergonomics of the thermal environment –
Analytical determination and interpretation of thermal comfort using
calculation of the PMV and PPD indices and local thermal comfort
criteria”.
Karlsson
F, Persson M-L and Rohdin P: (2006) “Possibilities and restrictions
using three building simulation software tools - A study of DEROB-LTH,
ESP-r and IDA ICE”. (Submitted for publication).
Kurnitski
J and Vuolle M: (2000) “Simultaneous calculation of heat, moisture, and
air transport in a modular simulation environment”, Proc. Estonian
Acad. Sci. Eng., (6), 1, pp. 25-47.
Lelieveld,
Mostert, Holah and White: (2003) “Hygiene in Food Processing”, CRC
Press:
Washington
DC
.
Pavolas
V: (2004) “Demand controlled ventilation – A case study for existing
Swedish multifamily buildings”, Energy
and Buildings 36, pp1029-1034.
Rohdin
P and Moshfegh B: (2005) “Numerical predictions of indoor climate in a
packaging facility”, (Submitted for publication),
Rohdin
P and Thollander P: (2006) “Barriers to and driving forces for energy
efficiency in the non-energy intensive manufacturing industry in
Sweden
”, Energy, (31) pp1500-1508.
Rohdin
P, Thollander P and Solding P: (2006) “Barriers and drivers to energy
efficiency implementation in the Swedish foundry industry”, (Accepted
for publication in Energy Policy)
Sahlin
P: (1996) “NMF Handbook – An introduction to the Neutral Model
Format” Nov.
Sahlin P: (1998) “A tool for data mapping from
design product models to object-oriented simulation models”, BRIS Data.
(http://www.equa.se.)
Sahlin
P and Grozman P: (2000) “Symbolic processing and code generation of
equation based HVAC&R simulation models”. (http://www.equa.se.)
Vuolle M: (1999) “An NMF based model library
for building thermal simulation”, Proc. 6th International IBPSA
Conference,
Kyoto
.
Voulle
M and Sahlin P: (2000) “IDA Indoor Climate and Energy Application”.
(http://www.equa.se.)
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Contents
Paper 1
Indoor
Air Quality in Fifty Residences in
Athens
: Santamouris, M., Argiroudis, K., Georgiou, M., Livada,
I.
, Doukas, P., Assimakopoulos, M.N., Sfakianaki, A., Pavlou,
K., Geros V. and Papaglastra, M.
Paper
2
Variable Air Volume-Flow Systems - A Possible Way
to Reduce Energy Use in the Swedish Dairy Industry: Rohdin, P. and
Moshfegh, B.
Paper
3
Experimental
Evaluation of Combined DCV and Economizer Cycle Using a FLC Variable Air
Volume (VAV) System: Karunakaran, R., Parameshwaran, R., Iniyan, S. and
Anand A. Samuel
Paper
4
Effects
of Nozzle Geometry on the Air Flow Jet and Temperature Distribution in an
Enclosed Space: Khan, M.I.
Paper
5
Automatic
Ventilation Control of Trickle Ventilators: Ridley,
I.
, Davies, M., Booth, W., Judd, C., Oreszczyn, T. and Mumovic, D.
Paper
6
Minimum Outdoor Air Supply for Radon in High Rise
Residential Buildings - Natural Ventilation v Air-Conditioning Unit: Lam,
K.S., Chan, E.H.W., Chan, D.W.T., Fung, W.Y., Law, K.C. and Tai, C.T.
Paper
7
Measurement and Prediction of Aerodynamic
Stability of an Axial-Flow Ventilation Fan near the Stall Condition: Cao,
R. and Hu, J.
Paper
8
Natural
and Mixed Ventilation Design via CFD and Architectural Modelling:
Todorovic, M., Ecim, O., Marjanovic, A. and Randjelovic, I.
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