Advanced heat driven hybrid refrigeration and heat pump systems. Z. Tamainot-Telto School Engineering University of Warwick Coventry CV4 7AL - UK)

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Transcription:

Advanced heat driven hybrid refrigeration and heat pump systems Z. Tamainot-Telto School Engineering University of Warwick Coventry CV4 7AL - UK)

Advanced heat driven hybrid refrigeration and heat pump systems 1. Introduction 2. Conceptual Hybrid systems - Configuration 1 (Description & Performance) - Configuration 2 (Description & Performance) 3. Conclusions )

1 - Introduction - UK Energy landscape Source: DECC Report 214 (UK) - Domestic heating & CO2 emission 37% (Primary Energy) 25% Contribution - Advanced Heat Pump (up to 4 kw): Prospect of CO2 emission reduction through better performance than condensing boiler (by factor of about 2 to 3).

2. Conceptual Hybrid systems: Configuration 1 ADSORPTION CYCLE WITH TURBINE (AdSC / AC-R717) CONVENTIONAL MECHANICAL VAPOUR COMPRESSION CYCLE (VCC / R717)

2. Conceptual Hybrid systems: Configuration 1 η t = 8% ΔT s = 7 K ADSORPTION CYCLE WITH TURBINE (AdSC / AC-R717) η tr = 8% ΔT s/c = 4 K η c = 8% CONVENTIONAL MECHANICAL VAPOUR COMPRESSION CYCLE (VCC / R717) ADSORBER AC 28C-R717 Shell-and-tube (4 off: 1m x 1 OD x.91mm Thickness) / SS Packed density: 75 kg/m 3 Thermal conductivity:.44 W/m K Internal wall contact HTC: 75 W/m 2 K External wall convective HTC: Infinite Bed operating pressure: 37 bar Maximum driving temperature: 25 o C

2. Conceptual Hybrid systems: Configuration 1 Performance Temperature ( o C) 3 25 2 15 1 5 Tube wall Module temperature profiles Carbon mean temperature 2 4 6 8 1 Time (s) Ammonia concentration (kg/kg).25.2.15.1.5 Module Ammonia concentration profiles Carbon mean Ammonia concentration 2 4 6 8 1 Time (s) Ammonia gas mass (kg).2.15.1.5 Ammonia mass flowing out of a Module 2 4 6 8 1 Time (s) Overall specific heat of Desorption (J/kg K) 1 8 6 4 2 Module Overall specific heat of Desorption 5 1 15 2 25 3 Carbon mean temperature ( o C)

2. Conceptual Hybrid systems: Configuration 1 Performance COP 2 1.5 1.5 TE = 1 o C TE = o C Hybrid AdSC-VCC: Tc = 4 o C TE = -5 o C 1 15 2 25 Total Heating Power output (kw) 4 3 2 1 Hybrid AdSC-VCC: Tc = 4 o C TE = 1 o C TE = o C TE = -5 o C 1 15 2 25 AdSC Heating Power output (kw) 4 3 2 1 TE = 1 o C TE = o C TE = -5 o C AdSC Contribution: Tc = 4 o C 1 15 2 25 VCC Heating Power output (kw) 1 8 6 4 2 TE = 1 o C TE = o C TE = -5 o C VCC Contribution: Tc = 4 o C 1 15 2 25

2. Conceptual Hybrid systems: Configuration 2 ΔT s = 7 K η t = 8% RANKINE CYCLE (RC / R718) η tr = 8% ΔT s/c = 4 K η c = 8% CONVENTIONAL MECHANICAL VAPOUR COMPRESSION CYCLE (VCC / R717) m f = 5g/s (18 kg/h)

2. Conceptual Hybrid systems: Configuration 2 Performance COP 4 3 2 1 TE = 1 o C TE = o C TE = -5 o C Hybrid RC-VCC: Tc = 4 o C 1 15 2 25 Total Heating Power output (kw) 4 3 2 1 Hybrid RC-VCC: Tc = 4 o C TE = o C 1 15 2 TE = -5 o C25 TE = 1 o C RC Heating Power output (kw) 4 3 2 1 RC Contribution: Tc = 4 o C 1 15 2 25 VCC Heating Power output (kw) 4 3 2 1 TE = 1 o C TE = o C TE = -5 o C VCC Contribution: Tc = 4 o C 1 15 2 25

2. Conceptual Hybrid systems: Configuration 2 Performance COP 4 3 2 1 TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C Hybrid RC-VCC: 1 15 2 25 Total Heating Power output (kw) 4 3 2 1 TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C Hybrid RC-VCC: 1 15 2 25 RC Heating Power output (kw) 12 11.5 11 1.5 1 9.5 RC Contribution: TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C 9 1 15 2 25 VCC Heating Power output (kw) 4 3 2 1 TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C VCC Contribution: 1 15 2 25

3. Conclusions Hybrid AdSC-VCC: - Limited COP ( 1.2 to 1.4) - Less cost effective - Simple AdSC could be better instead Hybrid RC-VCC: - Good COP (1.5 to 2.6) - Better than Hybrid AdSC-VCC - Better than condensing boiler - Could be cost effective - Space heating and DHW

Thank you

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