Published at HTHP Annex68 in September 2025.
For more information:
https://heatpumpingtechnologies.org/project68/task1/

Figure 1: HTHP Equipped with High Precision Double Hinged Arc Vane Compressor

Summary of technology

• At the heart of the HTHP, there is a novel double hinged arc vane compressor (Fig.1) driven by a vertically placed electrical motor. Main features are listed below.
• Closed loop HTHP is equipped with oil-to-refrigerant evaporator and condenser (Fig.2);
• Compressor eccentric shaft (5mm) allows for low torque arm and as such, ensures the lowest input shaft power in its class,
• Double hinges of the arc vane compressor fully eliminate sliding frictions that are inherently present in swing-vane type and other spring-vane type commercial rolling piston compressors;
• HTHP part load capabilities range from 20% up to 100% thanks to electrical inverter motor;
• The HTHP cycle is charging a high temperature thermal energy storage tank for commercial applications;
• We provide low-cost decarbonization solution for revalorization of low-grade heat from:
  • Air heat source (-10°C to 100°C)
  • Geothermal heat sources (10°C to 130°C),
• Each HTHP has a maximum installed thermal power of 1 MW. Each rack is combining standard compressors in series, each contributing to a rated heat pump power of 25kWth, 75kWth, and 125kWth;
• Lubrication oil is PAG68 and oil quantity is 0.75 Lt;
• No oil pump is needed;
• Development status has now reached TRL6 at the factory test bench;

• The Heat Transfer Fluid (HTF) on the sink and source sides is mineral-based Renotherm 320. Refrigerant-to-HTF heat transfer in the evaporator and condenser are achieved through 13.05 m2 of heat transfer surfaces and 29 m of finned copper piping. Hot oil circulation pumps move 100 liters of HTF within the condenser to the Thermal Energy Storage (TES).

Figure 2: Operational HTHP+TES prototype configuration

Table 1: Measured performance on factory test bench.

All information were provided by the supplier without
third-party validation. The information was provided as
an indicative basis and may be different in final
installations depending on application specific
parameters.

Published at HTHP Annex58 in September 2023.
For more information:
https://heatpumpingtechnologies.org/annex58/task1/

Left: Pars Makina double hinged arc vane: compact, no leakage, no friction, suction: blue, discharge: red

Middle: Spring loaded vane: leakage and friction,

Right: Swing vane: no leakage but vane-swing vane friction

• Semi-hermetic architecture.

• Electrical motor is operating at expander outlet temperature (35C) and pressure (40.7bar),

Direct coupling allows ease of compressor-expander alignment,