Description

A directly fired and periodically operating absorption heat pump has been designed and built for space-heating applications. Extensive investigations have been performed to determine the heat and mass transfer rates in the necessary components for the ternary mixture methanol-water/lithiumbromide. The results of those preliminary experiments, especially the achieved mean heat output and the overall heat transfer coefficients, proved that a technically scaled unit can be designed and constructed with an acceptable overall size.

Operation modes and the required components have been defined for a 10 kW prototype. The unit has been built and installed in a heat pump testing rack. The primary energy ratio (PER) has been determined for varying operating conditions. Unlike continuously operating heat pump systems, which at partial load are working in the on/off mode, the periodically operating heat pump ascertaines an increasing primary energy ratio, especially at partial load. An increase of annual efficiency up to 40% compared with conventional furnaces can be expected for an optimized device.

Units: SI

Citation: Symposium, ASHRAE Transactions, 1985, vol. 91, pt. 2B, Honolulu, HI

Product Details

Published:

1985

Number of Pages:

9

File Size:

1 file , 870 KB

Product Code(s):

D-HI-85-36-3