| Geothermal Heat Pumps, SCADA Systems and other HVAC Techs For the purpose of Building Energy Saving, following research works have been carried out: Developed a special test rig, for evaluating heat transfer performance for various geothermal heat exchangers. The test rig has been equiped with the capacity of data acquisition, automatic control, and performance analysis. It can carry out thermal responding tests in both cooling mode and heating mode under a required water circulation rate and a thermal load. Testing bore hole heat exchangers. Testing surface water heat exchangers, for a library heat pump project. Studying radiative ceiling air conditioning systems, Studying radiative floor air conditioning systems. Developed HVAC SCADA systems to monitor and to optimize the operation. |
| HVACR And Building Energy Saving Alternative Refrigerant Technology |
|
Alternative Refrigerant Technology And Thermodynamic Diagrams Developed colored thermodynamic diagrams for zero ODP refrigerants, using Lee-Kesler-Ploecker (LKP) EOS or Carnahan-Starling-De Santis (CSD) EOS, some sample diagrams are listed below: Designation Components Pressure-enthalpy, log(p)-h diagrams for some mixed refrigerants R407B R32/R125/R134a R407C R32/R125/R134a R410A R32/R125 R507 R125/R143a CARE30 R290/R600a CARE50 R170/R290 HX4 R32/R125/R143a/R134a Pressure-enthalpy, log(p)-h diagrams for pure refrigerants R134a R227 Enthalpy-entropy diagrams for pure refrigerants R134a R290 Enthalpy-concentration diagrams for some binary refrigerants R23/R134a |
| Research Works On Zeotropic Refrigerants For Energy Saving In Leeds University, developed an energy saving noval air conditioning/heat pumping system using zeotropic refrigerants, research work including: Developed a simulation programme; Developed a novel expansion valve; Developed a novel evaporator; Developed a novel condenser. Built an air conditioning test rig, which employed two air flow tunnels, a data acquisition system and instrumentation. Energy saving of about 35% was obtained with the novel air conditioning/heat pumping system using the candidate zeotrope compared with R22. The novelty was patented and won the Lightfoot Medal from the Refrigeration Institute in the 1992-1993 session. Research Works On Zeotropic Refrigerantl Behaviour Developed models to calculate concentration behaviour for a zeotropic refrigerant; Carried out concentration simulation for 3 zeotropic refrigerants; Zeotropic refrigerants and the special characteristics |
| Research Works On HVAC Measurement And Automation Developed a compressor calorimeter for testing compressor capacity and efficiencies, details shown below: Photo of the Calorimeter under construction; Image of the calorimeter SCADA system; Photo of the vessel heating system and the coil system;; Photo of a stepping motor driven automatic expansion valve; |
| Dr. Jiufa Chen's Education & Working Experiences: present, professor in the College of Energy & Environment, Southeast University, Nanjing, China. Senior Engineer, HVAC&R Industry, New Zealand; post-doctoral researcher, IKW, Hannover University, Germany Ph.D researcher, Leeds University, UK; M.Eng. study, Power Engineering Department, Nanjing Institute of Technology, China; B.Sc. study, Thermal Energy Engineering, Nanjing Institute of Technology, China; Email contact: Jiufa Chen |
