Imperial College London
Alternate

Professor Nilay Shah OBE FREng

Faculty of Engineering, Department of Chemical Engineering

Professor of Process Systems Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6621n.shah

 
 
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Assistant

 

Miss Jessica Baldock +44 (0)20 7594 5699

 
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Location

 

ACEX 522ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Sarabia:2020,
author = {Sarabia, EJ and Acha, Izquierdo S and Le, Brun N and Soto, V and Jose, Manuel P and Shah, N and Markides, C},
publisher = {ASHRAE},
title = {Modelling of a CO2 refrigerant booster system for waste heat recovery applications in retail for space heating provision},
url = {http://hdl.handle.net/10044/1/79228},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - This paper compares and quantifies the energy, environmental and economic benefits of various control strategies for recovering heat from a supermarket’s CO2 booster refrigeration system. There covered heat is used for space heating, with the goal of displacing natural gas fueled boilers. A theoretical model with thermal storage is presentedbased on a previous validated model from an existing refrigeration system in a food-retail building located in the UK. Sixheat recovery  strategies  are analysed  by  modifying thermal  storage  volumes  and pressure  levels  in the gas-cooler/condenser. The  model  shows that  a reduction of 30-40% in natural-gasc onsumption is feasible by the installation of a de-superheater and without any advanced operating strategy, and 40-50% by  using  a thermal  storage  tank.  However, the  CO2  system  can  fully  supply the  entire  space-heating  requirement  by  adopting  alternative  control strategies,  albeit  by  penalising  the  coefficient  of  performance  (COP)  of  the  compressor. Results  show  that  the  best  energy  strategy  can  reduce  total consumption  by 35%,  while the best  economic  strategy  can  reduce  costs  by 11%.  Findings  from  this  work  suggest that heat  recovery  systems  can bring substantial benefits to improve the overall efficiency of energy-intensive buildings,although trade-offs need to be carefully considered and further analysed before embarking on such initiatives.
AU  - Sarabia,EJ
AU  - Acha,Izquierdo S
AU  - Le,Brun N
AU  - Soto,V
AU  - Jose,Manuel P
AU  - Shah,N
AU  - Markides,C
PB  - ASHRAE
PY  - 2020///
TI  - Modelling of a CO2 refrigerant booster system for waste heat recovery applications in retail for space heating provision
UR  - http://hdl.handle.net/10044/1/79228
ER  -
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