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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1 Advanced heat driven hybrid refrigeration and heat pump systems Z. Tamainot-Telto School Engineering University of Warwick Coventry CV4 7AL - UK)
2 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 )
3 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).
4 2. Conceptual Hybrid systems: Configuration 1 ADSORPTION CYCLE WITH TURBINE (AdSC / AC-R717) CONVENTIONAL MECHANICAL VAPOUR COMPRESSION CYCLE (VCC / R717)
5 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
6 2. Conceptual Hybrid systems: Configuration 1 Performance Temperature ( o C) Tube wall Module temperature profiles Carbon mean temperature Time (s) Ammonia concentration (kg/kg) Module Ammonia concentration profiles Carbon mean Ammonia concentration Time (s) Ammonia gas mass (kg) Ammonia mass flowing out of a Module Time (s) Overall specific heat of Desorption (J/kg K) Module Overall specific heat of Desorption Carbon mean temperature ( o C)
7 2. Conceptual Hybrid systems: Configuration 1 Performance COP TE = 1 o C TE = o C Hybrid AdSC-VCC: Tc = 4 o C TE = -5 o C Total Heating Power output (kw) Hybrid AdSC-VCC: Tc = 4 o C TE = 1 o C TE = o C TE = -5 o C AdSC Heating Power output (kw) TE = 1 o C TE = o C TE = -5 o C AdSC Contribution: Tc = 4 o C VCC Heating Power output (kw) TE = 1 o C TE = o C TE = -5 o C VCC Contribution: Tc = 4 o C
8 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)
9 2. Conceptual Hybrid systems: Configuration 2 Performance COP TE = 1 o C TE = o C TE = -5 o C Hybrid RC-VCC: Tc = 4 o C Total Heating Power output (kw) Hybrid RC-VCC: Tc = 4 o C TE = o C TE = -5 o C25 TE = 1 o C RC Heating Power output (kw) RC Contribution: Tc = 4 o C VCC Heating Power output (kw) TE = 1 o C TE = o C TE = -5 o C VCC Contribution: Tc = 4 o C
10 2. Conceptual Hybrid systems: Configuration 2 Performance COP TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C Hybrid RC-VCC: Total Heating Power output (kw) TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C Hybrid RC-VCC: RC Heating Power output (kw) RC Contribution: TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C VCC Heating Power output (kw) TC = 4 o C TC = 45 o C TC = 5 o C TC = 55 o C TC = 6 o C VCC Contribution:
11 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
12 Thank you
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