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Energy recovery in new and retrofitted heat pumps using a dedicated expander concept

Objective

In vapour-compression cycles (VCC) and more specifically in heat pumps, mechanical work is supplied to the compressor for increasing the pressure of the evaporated refrigerant. Heat is rejected in the condenser (effective heating at heating mode), for the condensation of the refrigerant, which is then expanded in a throttle valve (no power produced), in order to decrease its pressure, resulting to a two-phase mixture. The heat supply to the evaporator (effective cooling at cooling mode) evaporates further the refrigerant.
The aim of the EXP-HEAT project is to develop a dedicated component and to integrate it in heat pump units. This component is actually a positive displacement liquid expander with capacity of around 1-2 kW and will replace the throttle valve used in vapour-compression units. Its purpose is to recover the energy of the high-pressure liquid refrigerant, by producing power and assisting in the compression process, reducing the compression work by up to 10-15%. At the same time the heat removed is increased by around 5%, since the expansion of the liquid refrigerant is not isenthalpic. The resulting increase of the Coefficient Of Performance (COP) is expected to reach even 20% at specific operating conditions and for both heating/cooling modes, significantly improving the performance of a heat pump, without major interventions and keeping the additional cost low, in order to ensure the cost-effectiveness of this concept.
In order to achieve these targets, the developed expander will be extensively tested under a wide range of operating conditions, in order afterwards to be delivered and integrated in a re-designed heat pump with a capacity of 10-20 kW, and also used for the proper retrofitting of an already installed unit of the same capacity.

Field of science

  • /engineering and technology/environmental engineering/waste management/energy recovery

Call for proposal

FP7-SME-2013
See other projects for this call

Funding Scheme

BSG-SME - Research for SMEs

Coordinator

NATIONAL TECHNICAL UNIVERSITY OF ATHENS - NTUA
Address
Heroon Polytechniou 9 Zographou Campus
15780 Athina
Greece
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 58 080
Administrative Contact
Georgia Mertzelou (Ms.)

Participants (6)

UNIVERSITA DEGLI STUDI DI FIRENZE
Italy
EU contribution
€ 21 074
Address
Piazza San Marco 4
50121 Florence
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Benedetto Allotta (Prof.)
KUNGLIGA TEKNISKA HOEGSKOLAN
Sweden
EU contribution
€ 27 520
Address
Brinellvagen 8
100 44 Stockholm
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Sara Karlsson
THERMOGAS ANONYMI EMPORIEI EISAGOGIKI KAI TECHNIKI ETAITEIA EIDON THERMANSIS KAI CLIMATISMOU
Greece
EU contribution
€ 309 360
Address
Leoforos Anthousis 12
153 51 Pallene
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Sotirios Katsimichas (Dr.)
OFFICINE MARIO DORIN SPA
Italy
EU contribution
€ 252 090
Address
Via Aretina 388 Compiobbi
50061 Fiesole Fi
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Lorenzo Fanetti (Dr.)
EUREFTEC AB
Sweden
EU contribution
€ 433 400
Address
Wienhojden 6
76192 Norrtalje
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Kenneth Weber (Mr.)
ITALGROUP SRL
Italy
EU contribution
€ 267 580
Address
Via Antonio Pacinotti 20/22 Frazione Gaggio Di Piano
41013 Castelfranco Emilia
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Luciano Ghiaroni (Mr.)