Estudio teórico y experimental de los componentes térmicos para bombas de calor de resorción con CO2.

Identificador:  TDX:3370

Handle: https://hdl.handle.net/20.500.11797/TDX3370

Autors:  Dávila Aldás, Paúl Sebastián

Resum:
Heat pump technology is an interesting option to recover waste heat at low temperatures (40 – 60ºC) and upgrade it to temperatures above 80ºC to meet the heat demand in industrial processes, and thus reduce consumption of primary energy and associated CO2 emissions. Current heat pump technologies are limited by the thermodynamic properties of working fluids and the resistance of their components. Compression/resorption heat pumps using refrigerant/absorbent working fluid mixtures such as CO2/acetone can operate at low high pressures with good performances. This research aims to experimentally study the desorption process in a plate heat exchanger of the CO2/Acetone mixture as an alternative for its use in the compression/ resorption heat pump cycle. The experimental results show values for the heat transfer coefficient (hs) between 0.2 and 0.5 kW/ m2K. An increase in the temperature of the heating water and a low temperature difference between the heating water and the temperature of the solution at the desorber´s inlet enhance the heat transfer. The hs value decreases as the pressure of the experiment increases. The heat transfer in the heat exchanger improves with low mass fractions of CO2 in the CO2/Acetone solution (22 % - 25%). The calculated mean vapour quality reaches a maximum value of 16% at a test pressure of 12 bar. The calculated heat transfer in the heat exchanger is between the 1.5 and 5 kW/ m2 range. The calculated desorption flow is between 0.002 and 0.005 kg/s.