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Related publications (26)

Pompe à chaleur air-eau à Haute Température. Phase 2: cycle à injection optimisé, essai journaliers et compreseur booster. Analyse thermo-économique.

François Maréchal, Daniel Favrat, Michele Zehnder

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

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

Wärmepumpe mit Hilfskreislauf zur Kondensatunterkühlung, Phase II : Experimentelle Untersuchung

Daniel Favrat, Pedro Miguel Nunes Pereira de Almeida Reis, Michele Zehnder

A brine/water heat pump with the auxiliary liquid subcooling cycle with a heating capacity of 9 kW at -7/50°C was built and a series of measurement were conduced. The heat pump is designed for the monovalent heating in the retrofit market. For this purpose ...

1999

Wärmepumpe mit Hilfskreislauf zur Kondensatunterkühlung, Phase I.

Daniel Favrat, Michele Zehnder

In this report different air-water heat pump cycles under the operating conditions of the retrofit market and in the low heating power range are examined. The already existing heat pump models show excessive power and efficiency loss at very low ambient te ...

1998

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

Flow Boiling in Horizontal and Vertical Tubes: the Effect of Tube orientation on Heat Transfer.

John Richard Thome, Daniel Favrat

As part of a comprehensive study on factors affecting flow boiling in horizontal tubes, local boiling heat transfer coefficients were measured for R- 134a evaporating inside the same 12.00 mm bore, plain tube for horizontal flow, vertical upflow and vertic ...

1995

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