CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

The compression/absorption heat pump cycle – conceptual design improvements and comparisons with the compression cycle

Pompe à chaleur à compression à absorption—amélioration de la conception et comparaisons avec un cycle à compression seule

Magnus Hultén (Institutionen för värmeteknik och maskinlära) ; Thore Berntsson (Institutionen för värmeteknik och maskinlära)
International Journal of Refrigeration (1404-7098). Vol. 25 (2002), 4, p. 487-497.
[Artikel, refereegranskad vetenskaplig]

Performance improvement of an industrial single-stage compression/absorption heat pump (CAHP) using an ammonia/water mixture as the working fluid has been studied theoretically. By allowing a higher absorber pressure (40 bar) than the highest design pressure of today's screw compressors (25 bar), higher COPs could be obtained. Longer falling-film tubes in the vertical shell-and-tube absorber and desorber also increased the COP. These two modifications together increased the COP of the CAHP by 10%. The improved design has a lower optimal absorber glide (temperature difference due to composition change in absorber) and reduced solution heat exchanger sizes. The study was performed with a constant total area. Furthermore, the CAHP performance was studied for five heating cases. Its performance was compared to that of a two-stage compression heat pump (CHP) using isobutane as working fluid, on the basis of approximately equal investment cost. It could be concluded that only heating cases where both the sink and the source temperature changes are high (>20 K) give superior performance for the CAHP.

Nyckelord: Ammonia, Water, Heat pump, Absorption



Denna post skapades 2007-06-29. Senast ändrad 2011-10-31.
CPL Pubid: 43420

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för värmeteknik och maskinlära (1949-2002)

Ämnesområden

Kemiteknik

Chalmers infrastruktur