A heat pump evaporator using the falling film technique
Conference contribution, 1984
This paper presents a new heat pump evaporator. The evaporator is a vertical shell-and-tube heat exchanger utilizing the falling film principle on both the shell and the tube side. The advantages with this arrangement are:
- Dirty water can be used since the evaporator can be cleaned without shutting down the unit.
- Low pressure drops.
- High heat transfer coefficients.
- Relatively low investment cost.
Measurements of the heat transfer for the evaporation of pure R12 (no oil contamination) gave length average heat transfer coefficients in the range of 2000-5000 W/m2K depending on the heat flux.