Annex 54 organized two workshops for “Heat Pumps for Low-GWP Refrigerants” at the 25th IIR Conference ICR 2019 in Montréal, Canada on 26th August. Seven presentations were held by experts from the participating countries in the Annex and invited speaker from Germany. Here is summary of presentations.
- Dr. Piotr A. Domanski from NIST, USA presented for “Screening for Next Generation Refrigerants.” He presented screening results of low-GWP refrigerants and concluded that there is no direct HFO replacement candidate for R-410A and tradeoff between GWP and flammability is needed, and recommended to redesign new equipment.
- Dr. Xudong Wang from AHRI, USA presented for “Ensuring a Safe Refrigerant Transition.” He introduced AHRI’s Low GWP Alternative Refrigerants Evaluation Program (AREP)” and presented US pathway for using flammable refrigerants. He shared AHRTI’s project 9007 on flammable refrigerants for whole room scale testing of A2L and A3 refrigerants to understand the ignition event severity not probability of event. He suggested assessing refrigerant detector characteristics for use in HVACR equipment, combustion byproducts risk study and accessing the effectiveness of mitigation requirements as future research projects.
- Professor Luca Molinaroli from Pilitenico di Milano presented for “Experimental Analysis of the Use of R134a, R1234ze(E) and R1234yf in a Small Water-to-water Heat Pump.” He presented test results and concluded that the heating capacity of the heat pump working with the two HFOs could be matched to the R134a level by increasing the compressor speed but the COP is further reduced and R1234yf exhibited higher COP than R1234ze(E). He planned for testing of R450A and R513A.
- Professor Eiji Hihara from University of Tokyo presented for “Risk assessment of A2L refrigerants implemented in Japan.” He presented Japanese collaborative research results for risk assessment of A2L refrigerants and mentioned that the risk assessment for the safe use of flammable gases such as hydrocarbons is underway.
- Dr. Samuel Yana Motta from Honeywell, USA presented for “Low GWP Refrigerants for Heat Pump Systems.” He compared four alternatives with R410A and suggested that R-466A (GWP<750) is closest match to R410A’s performance amongst A1 class refrigerants while using the same size/design of compressor and heat exchangers.
- Dr. Lena Schnabel from Fraunhofer Institute for Solar Energy Systems presented for “R290 Researches at Fraunhofer ISE”. She presented efforts for charge reduction of R290 in heat pumps and leakage prevention, detection and control.