Concept

Rotary-screw compressor

Related publications (53)

Low power ORC-ORC systems for heat pump applications

This paper presents a study of a residential (about 20kW) ORC-ORC (Organic Rankine Cycle) thermally driven heat pump. The system works with three different temperature levels similar to absorption heat pumps. The proposed concept is a hermetic system using ...

2008

Integrated design, optimization and experimental investigation of a direct driven turbocompressor for domestic heat pumps

Jürg Alexander Schiffmann

Heating and cooling will more and more rely on heat pumping in order to enable a more rational use of energy. The further development of domestic and small industrial multi-stage heat pumps with enhanced performance is impaired by the presence of oil mixed ...

EPFL2008

Fountain Codes for the Slepian-Wolf Problem

Mohammad Amin Shokrollahi, Bertrand Ndzana Ndzana

In this paper, we describe one solution to the two-user Slepian-Wolf problem in a certain part of the achievable region using fountain codes. Symmetric case of memoryless compression of two correlated sources is considered and modeled by a BSC channel. The ...

2006

Theoretical Design of a High Speed, Oil Free Radial Compressor for Domestic Heat Pumps

Daniel Favrat, Jürg Alexander Schiffmann, Adam Molyneaux

The devlopment of domestic heat pump systems is mainly based on the use of volumetric oil lubricated compressors. Following the implementation of economizer based rotary compressors, which represented a major improvement step, one major opportunity to impr ...

2005

Theoretical Design of a High-Speed Low Power Radial Turbocompressor

Daniel Favrat, Jürg Alexander Schiffmann

High-speed bearings and electrical motors are gradually getting available. This is of particular interest for the application of thermal turbomachinery. The availability of high speed bearing and motor components opens the way to new applications for low p ...

2005

Analyse de la migration d’huile dans les pompes à chaleur mono- et biétagées

Daniel Favrat, Michele Zehnder

The Laboratory of Industrial Energy systems has evaluated a series of high performance air-water heat pump concepts with the aim to retrofit existing fuel fired boilers for residential hydronic heating systems. The results are published within the framewor ...

2003

Wärmepumpe mit Zwischeneinspritzung bei Scrollkompressoren.

Daniel Favrat, Michele Zehnder

This project is evaluating a heat pump cycle with midstage injection at scroll compressors. The injected refrigerant is evaporated partially by an internal heat exchanger (fig. 2.1). A glycol-water heat pump with 12 kW heat capacity at B-5/W50 was built an ...

2000

Pompe à chaleur bi-étagée à haute performance.

Daniel Favrat, Michele Zehnder

The objectives of the present work is to theoretically and experimentally demonstrate the advantages of a two-stage cycle equipped with an economizer and single variable speed compressor for heat pumps using air as cold source. Furthermore, an efficient de ...

1997

Performances of 3.9 MWTH Ammonia Heat Pumps within a District Heating Cogeneration Power Plant: Status After Eleven Years of Operation.

Daniel Favrat, Xavier Pelet

A complex heating and cogeneration plant including two 3.9 MWth ammonia heat pumps and two 3 MWel gas turbines with heat recovery boilers and three strage tanks has been in operation since 1986. This paper is a result of an expreimental evaluation during t ...

1997

Comparison Between a Single Stage and a Two Stage Air to Water Domestic Heat Pump with one Variable Speed Compressor.

Daniel Favrat

Replacing conventional boilers by air to water heat pumps represents a major market opportunity and a contribution to more sustainable heating approaches. However, such retrofit situation impose tough technical requirements which must be met in order to de ...

1997

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