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Michele Zehnder

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Publications associées (13)

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Implementation of a scroll booster compressor into a single-stage air-water heat pump for peak winter day

Daniel Favrat, Jürg Alexander Schiffmann, Jean-Baptiste Carré, Michele Zehnder

This paper shows an implementation of a scroll booster compressor mounted at the suction line of a single-stage air-water heat pump. The compressor selected to be used as booster is a beltdriven scroll compressor initially dedicated to automotive refrigera ...

2010

Screening for Refrigerant Blends in High-Temperature Lift Heat Pumps for Retrofit in Residential Heating

Daniel Favrat, Michele Zehnder

Providing heat pumps for the retrofit of fuel based boilers in residential heating, is a short or medium term challenge and a major opportunity for a substantial reduction of greenhouse gas emissions. While effective solutions for improved high temperature ...

2005

In order to extend the application range of air-water heat pumps to high temperature residential heating systems, new small hermetic compressors with remodeled injection ports for vapor injection have successfully been tested in laboratory. The injection f ...

2005

Efficient air-water heat pumps for high temperature lift residential heating, including oil migration aspects

Michele Zehnder

This thesis presents a system approach with the aim to develop improved concepts for small capacity, high temperature lift air-water heat pumps. These are intended to replace fuel fired heating systems in the residential sector, which leads to a major redu ...

EPFL2004

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

A new type of air-water heat pump has been developed with the aim to cover an extended application range in high temperature residential heating (for retrofitting existing oil or gas boilers in hydronic heating systems). The base heat output is about 10 kW ...

2002

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The project High Temperature Heat Pump has been completed in 2 phases. First a new type of scroll compressor with adapted injection port for vapor injection, was tested with an air-water heat pump (fig 2.2, 2.3). This type of heat pump reaches the extreme ...

2002

Oil Migration on Single and Two Stage Heat Pump Systems (Calibration Tests and Process Design Phase 1)

Daniel Favrat, Michele Zehnder

The subject of this project is to develop a high performance air water heat pump which is able to be introducted in the retrofit market. The system requirements of this market are heating temperatures of 65°C, at ambient temperatures descending until -12°C ...

2001

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 biétagée à haute performance. Phase 2: Dégivrage par énergie à basse exergie.

Daniel Favrat, Michele Zehnder

The capacities of performance improvements of low and mid-size heat pumps are studied in this project. For the new buildings market, the components of the heat pump match already well the requirements for high performance and monovalent heating. Minor impr ...

1999