in a LaboratoryFinnish magazine TM Rakennusmaailma has taken testing of heat pumps from different manufacturers. For magazine issue, with help from natural resource center freezing warehouse in Vihti town, Finland, they tested equipment, which can operate in winter time, from C&H, Panasonic and Daikin. Heat pumps from these manufacturers, in according to existing data, can operate properly even when it’s -13° F(-25°C) degrees below zero.
Cooper&Hunter: Refrigerant schematics
- 1. The compressor.
- 2. The expansion valve.
- 3. The four-way valve.
- 4. Indoor unit compartment, which acts as a condenser in the heating mode.
- 5. Outdoor unit sensor, which operates as an evaporator in the heating mode.
- 6. The intercooler.
- 7. The control valve (Flash vaporizer). The refrigerant rotation direction in the heating mode is denoted by red arrows in the figure
The air-source heat pumps were tested at -22°F (-30°C) degrees below zero for the first time. All three pumps worked normally in the coldest conditions.
Different compressor types
The measurement environment
|Indoor unit (WxHxD) mm||860x305x170||798x295x372||890x295x375|
|Outdoor unit (WxHxD) mm||899x596x378||795x693x300||799x630x299|
|Refrigerant / weight (kg)||R410/1,30||R32/1,34||R32/1,20|
|Heating capacity (kW)||3,4||4,5||3,6|
|Energy efficiency class (heating)||A+++*)||A+++*)||A+++*)|
The measurements were used to study the air-source heat pumps heating power and energy consumption at different outside temperatures when heating the indoor space to 68°F (+20°C).
The magazine has chosen leaders in air flow heat pumps manufacturing, and all equipment has showed a good result in testing and proved the ability to operate at -22°F (-30°C). Heat pump from Cooper&Hunter is a pioneer in the introduction of the air-source heat pump compressor technology. The device of 12-series has a nominal heating capacity of 3.4 KW. It’s equipped with a two-stage compressor that worked during the tests. C&H distinctive feature is radio remote control and also ability to control the device using the WiFi technology. The device worked very consistently and seamlessly at very cold temperatures, with extra low noise level.
C&H heat pump with 2-stage compressor worked very stable from 44.6°F(+7°С) to 19.4°F(-7°С ), but the best results were achieved at 14°F(-10°С) (the most effective operation). Editor’s Choice: CH-12FTXHV-B – the best heat pump in terms of price / quality.