Five Common Questions for Air Source Heat Pump

1. What are The Types of Air Source Heat Pump Heating System?

Four Major categories of air source heating system: 

• Air source heat pump + radiators: general water temperature around 55℃.

• Air source heat pump + fan coils: general water temperature around 45℃.

• Air source heat pump + underfloor heating: general water temperature around 35℃.

• Air source heat pump direct condensing heating (including air to air heat pump, no water floor heating and so on), this type of application is relatively rare at present.

2. What are The Advantages and Disadvantages of These Major Air Source Heating Systems?

(1) Air source heat pump water heater + radiators

• Advantages: Simple replacement, can directly replace the original boiler heat source. Compared with direct electric heating, the energy saving effect is remarkable. Compared with the electric boiler heating method, it saves the cost of power capacity increase.

• Disadvantages: High temperature heating, indoor temperature is slow, poor thermal comfort, occupy a certain space.

(2) Air source heat pump water heater + fan coils

• Advantages: Rooms heat up faster. Each room's fan coil fan is independently controlled, which is conducive to behavioral energy saving;  The water supply temperature is lower than the radiator, the energy efficiency ratio of the air source heat pump is high, and the operation cost is less. The system is simple, flexible and convenient to install. The system can be used with one machine, heating in winter and cooling in summer. For users who need refrigeration in summer, the comprehensive initial investment cost is lower. 

• Disadvantages: Slightly less comfortable, will have a slight noise, will lose part of the electric power.

(3) Air source heat pump water heater + underfloor heating

• Advantages: Energy saving, low operating cost, high comfort. The system has a certain heat storage function and good thermal stability, which can effectively offset the heating power fluctuation in extreme weather, making the system run more stable and reliable.

• Disadvantages: Renovation of existing buildings will destroy the original ground. For buildings, buildings will also lower the height of the rooms. If there are construction quality problems, maintenance is difficult.

(4) Air source heat pump direct condensing heating (air to air heat pump)

• Advantages: The system is simple, easy installation and maintenance, low failure rate, high energy saving.

• Disadvantages: Poor comfort, and slight noise.

3. Is The Running Cost Related to The Terminal Equipment Combination?

The level of the operation cost has a great relationship with the combination of the end, the same heat pump equipment, the cost of the radiator is the highest, the fan coil unit is the second, and the ground radiation heating cost is the lowest.

4. How to Choose The Terminal Equipment for Air Source Heating System?

• For new buildings, ground radiant heating is preferred. The existing building reconstruction can choose radiator or fan coil two forms. If the radiator is old or the number of new more, it is recommended to choose the low-temperature fan coil form.

• The fan coil heating end can be heated by hot water in winter and cooled by cold water in summer. It is also referred to as the dual-use end. The fan coil heating end can be set upper (top hanging type) or lower (floor type). It is recommended to use the lower setting (floor type).

• Matters needing attention when choosing floor type: Floor-type fan coil unit for air inlet and air outlet. Floor type fan coil unit for lower air inlet side air outlet. 

5. How to Determine The Capacity of Air Source Heat Pump?

• The capacity of the heat pump is mainly determined according to the heating area of the house, the height of the floor, the insulation of the wall, the insulation of the doors and Windows and the sealing.

• Large heating area, poor insulation housing generally to choose a large capacity heat pump.

• Small heating area, good insulation housing can choose a smaller capacity of the heat pump.

• Heat pump selection is not the greater the capacity, the better, appropriate is the best, heat pump with large, easy to cause frequent start and stop, at the same time the cost is high, power distribution is large, causing unnecessary waste. Heat pump with small, it cannot reach the heating effect.