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Multi + heat pump combines cooling, heating and hot water supply in a single energy-saving system
Product Description
The Heating Cycle
Components of an Air-source Heat Pump Heating Cycle
During the heating cycle, heat is taken from outdoor air and "pumped" indoors.
First, the liquid refrigerant passes through the expansion device, changing to a low-pressure liquid/vapour mixture. It then goes to the outdoor coil, which acts as the evaporator coil. The liquid refrigerant absorbs heat from the outdoor air and boils, becoming a low-temperature vapour.
This vapour passes through the reversing valve to the accumulator, which collects any remaining liquid before the vapour enters the compressor. The vapour is then compressed, reducing its volume and causing it to heat up.
Finally, the reversing valve sends the gas, which is now hot, to the indoor coil, which is the condenser. The heat from the hot gas is transferred to the indoor air, causing the refrigerant to condense into a liquid. This liquid returns to the expansion device and the cycle is repeated. The indoor coil is located in the ductwork, close to the furnace.
The ability of the heat pump to transfer heat from the outside air to the house depends on the outdoor temperature. As this temperature drops, the ability of the heat pump to absorb heat also drops. For many air-source heat pump installations, this means that there is a temperature (called the thermal balance point) when the heat pump's heating capacity is equal to the heat loss of the house. Below this outdoor ambient temperature, the heat pump can supply only part of the heat required to keep the living space comfortable, and supplementary heat is required.
It is important to note that the vast majority of air-source heat pumps have a minimum operating temperature, below which they are unable to operate. For newer models, this can range from between -15°C to -25°C. Below this temperature, a supplemental system must be used to provide heating to the building.
The Cooling Cycle
Components of an Air-source Heat Pump Cooling Cycle
The cycle described above is reversed to cool the house during the summer. The unit takes heat out of the indoor air and rejects it outside.
As in the heating cycle, the liquid refrigerant passes through the expansion device, changing to a low-pressure liquid/vapour mixture. It then goes to the indoor coil, which acts as the evaporator. The liquid refrigerant absorbs heat from the indoor air and boils, becoming a low-temperature vapour.
This vapour passes through the reversing valve to the accumulator, which collects any remaining liquid, and then to the compressor. The vapour is then compressed, reducing its volume and causing it to heat up.
Finally, the gas, which is now hot, passes through the reversing valve to the outdoor coil, which acts as the condenser. The heat from the hot gas is transferred to the outdoor air, causing the refrigerant to condense into a liquid. This liquid returns to the expansion device, and the cycle is repeated.
During the cooling cycle, the heat pump also dehumidifies the indoor air. Moisture in the air passing over the indoor coil condenses on the coil's surface and is collected in a pan at the bottom of the coil. A condensate drain connects this pan to the house drain.
Product Parameters
| Model No. | DKFXSL-20II-LBC | DKFXSL-25II-LBC |
| Model Description | 9P | 10P |
| Rated cooling capacity | 20kw | 25kw |
| Rated cooling input power | 6.7kw | 8.4kw |
| Cooling capacity range | 5~25kw | 5~28kw |
| Cooling input power range | 1.8~8.5kw | 1.8~9.4kw |
| Rated heating capacity | 20KW | 25KW |
| Rated heating input power | 5.8kw | 7.3kw |
| heating capacity range | 6~28kw | 6~31kw |
| heating input power range | 1.8~8.4kw | 1.8~11kw |
| Max input power | 9.5kw | 12kw |
| Max input current | 16A | 19A |
| Electric shock protection | Class I | Class I |
| Waterproof grade | IPX4 | IPX4 |
| Charge volume | R410A/5.5kg | R410A/6.0kg |
| Water side resistance | 30kPa | 30kPa |
| Circulation volume | ≥4.9m³ | ≥5.8m³ |
| Running high pressure | ≤4.2MPa | ≤4.2MPa |
| Noise | ≤62dB(A) | ≤63dB(A) |
| Net weight | 170kg | 190kg |
| Water pipe diameter | 1.5inch | 1.5inch |
| Unit dimension | 1290x450x1570(mm) | 1290x450x1570(mm) |