Sam Cockerill of Libertine FPE presents on capturing waste heat through small-scale organic Rankine cycle technology. Current waste heat recovery is uneconomic at small scales, especially for intermediate and low-grade heat. Libertine aims to improve small Rankine cycle economics by minimizing costs through a low-cost expander, automotive parts, and standardized design, while maximizing output with high efficiency expansion and conversion. The objective is to demonstrate a small-scale ORC module capable of a payback period of less than 3 years from heat sources of around 0.5MW at 250 degrees Celsius.

1. ON-SITE AD – THE BENEFITS
OF CAPTURING HEAT
#UKADBiogas @adbioresources
CHAIR:
DAN POULSON, BASEPOWER
PANEL:
SAM COCKERILL, LIBERTINE FPE
MARCEL BORKENT, TRIOGEN
MICK JONES, WOODTEK ENERGY

2. Sam Cockerill, CEO
www.libertine.co.uk

3. Current waste heat recovery tech is uneconomic at
small scales, esp. with intermediate & low grade heat
3
June 2015
Libertine linear power systems
Low grade
(<100 deg C)
Intermediate grade
(100-300 degC)
High grade
(>300degC)
Large scale,
>5MW_th
Mid scale
>0.5MW_th
Small scale
<0.5MW_th
Most waste
heat arises here
Generally
Uneconomic
Key
Marginal
economics
Positive
economics

4. Minimise cost
1. Minimise capital cost
Low cost expander
Automotive balance of plant items
Integrated & compact design
Standardized product
3. Minimise O&M cost
4
June 2015
Libertine linear power systems
Maximise output
2. Maximise power/heat
High efficiency gas expansion
& electrical power conversion
Reduce friction & other
parasitic losses
Permit 2 phase expansion
4. Maximise utilisation & life
Eliminate oil system & wearing
components where possible
Remote management & diagnostics
How to improve small rankine cycle economics

5. Linear power systems
5June 2015
Libertine linear power systems
High performance gas expander-generator
systems for small rankine cycle applications

6. 6kWe research
expander (2013)
6
June 2015
Libertine linear power systems
5kWe demonstration
motor (2015)
20kWe ORC
expander (2015)
Linear power systems

7. 20kWe ORC module using Libertine expander
7June 2015
Libertine linear power systems
Objective
Demonstrate small scale ORC technology
capable of delivering <3 year payback
from ~<0.5MW heat at ~250degC

8. ON-SITE AD – THE BENEFITS
OF CAPTURING HEAT
#UKADBiogas @adbioresources
CHAIR:
DAN POULSON, BASEPOWER
PANEL:
SAM COCKERILL, LIBERTINE FPE
MARCEL BORKENT, TRIOGEN
MICK JONES, WOODTEK ENERGY