HIGH TEMPERATURE HEAT PUMP MC Meeting 29 th of June Loughborough - PowerPoint PPT Presentation

HIGH TEMPERATURE HEAT PUMP MC Meeting – 29 th of June Loughborough University Professor Neil J Hewitt Dr Mingjun Huang Miguel Ramirez

Summary • Introduction • Theoretical approach • Working Fluids • Experimental Work • Results • Future Work

Introduction High Temperature Heat Pump Applications • Petroleum Industry • Chemical • Food & Beverages • District Heating • Nuclear Power • Desalination • Waste Water Treatment

HT Heat Pump Theoretical Approach • Alternative working fluid • Multistage cycles • Compressor performance • Controlling system • Materials, Oil, etc

Working Fluids Selection GWP • R410A = 2088 • R134a = 1300 • R245fa = 950 • R365mfc = 782 • R1234ze(E) = 6 • R1234ze(Z) = <10* • R1234yf = 3 • R404A = banned (F-Gas >2500 ban)

Experimental Work Small Scale Unit Testing • Single loop - Water to Water/ Brine to Water • Steady State • LT, MT, HT, VHT and non standard Temperatures • British Standards 14511 Item Manufacturer Type Description No# COMPRESSOR Copeland ZH15K4E Scroll 1 CONDENSER SWEP B8Tx40 2 LIQUID RECEIVER Denaline VLR 1.5 lt 3 FILTER/DRIER Danfoss DML 164 1/2" 4 EXPANSION VALVE Danfoss ETS6 Electronic 5 EVAPORATOR SWEP B15x20 6 SIGHT GLASS Danfoss SGP 7 SUPERHEAT CONTROLLER Danfoss EKD 316 8

Experimental Work Testing Results R134a R245fa Superheating 5°K 5°K Subcooling 3°K 3°K η isentropic 69% 62% Max T evap 20°C 55°C Max T cond 65°C 85°C

Experimental Work Type of building Hospital STES District Heating - Poland 175 m 2 Solar collectors 800 m 3 STES Volume Demand temperatures 55/75°C Solar Fraction 50% Gas boiler (kW) 95 kW 75°C 65°C

Experimental Work R245fa Heat Pump • Heating Capacity: 90kW • Compressor: Stream semi-hermetic • Compressor disp: 153 m 3 /h • Single loop – Water to Water • EXV: Electronic • T evap : 30 ° - 50 ° C • T cond : 70 ° - 80 ° C • P abs : 0.1 – 0.3 MPa

Results Polish Pilot Plant T amb : 0 ° – 2.4 ° C Q heat : 39kW P in : 7.1 kW COP : 5.5 η isentropic 68% T out max : 82 ° C

Future Work Challenges • Alternative Working fluids (150 ° -200 ° C) • R245fa, R1234ze(Z), R365mfc • Refrigerant Mixtures • Compressor Technology • Lubricants • Sealing • EXV Controllers

THANK YOU Professor Neil J Hewitt Dr Mingjun Huang Miguel Ramirez