Navigation list:
What types of air source heat pumps are there?
Where can an air source heat pump be used?
What is air source heat pump system?
- Air source heat pump + Radiator system
- Air source heat pump + Fan coil system
- Air source heat pump + Floor heating system
What is a monobloc heat pump system and split heat pump system?
How to choose the terminal equipment of the air source heat pump system?
How to calculate the required heat pump capacity?
What types of air source heat pumps are there?
There are many types of heat pumps, and according to different classification standards, there will be different names. Generally, there are several classification methods:
According to different application scenarios/terminal equipment connections
According to the different functions of the unit
Ø Single heat air source heat pump
Ø Single cooling air source heat pump
Ø Heating cooling air source heat pump
Ø Triple supply air source heat pump of heating, cooling and hot water
According to different output water temperature
Ø High-temperature air source heat pump (output water temps.55℃/131℉)
Ø Ordinary air source heat pump (output water temps.45℃/113℉)
According to different types of compressors
Ø Inverter air source heat pump( Full DC type/DC type/AC type)
Ø ON-OFF air source heat pump
According to different outdoor ambient temperature
Ø Low-temperature air source heat pump
Ø Ordinary air source heat pump
According to the density of integration of the unit
Ø Monobloc heat pump: There is only one unit, and its circulating water pump, expansion tank, etc. are integrated in the heat pump
Ø Split heat pump: It consists of an indoor unit and an outdoor unit, and the water systems such as heat exchangers and water circulation pumps are integrated in the indoor unit.
Where can an air source heat pump be used?
✔Hot water for industrial production
✔Hot water for bathing in factories, preheating of drinking hot water, washing in hospitals, hot water for bathing Hot water for showering in schools or private student dormitories and company dormitories
✔A large number of central hot water supplies in hotels, guesthouses, and guest houses, hot water in bath centers, restaurants, and restaurant kitchens
✔Preheating water for beauty salons and drinking water in kindergartens and schools
✔Family shower, bathtub, jacuzzi, using hot water, especially suitable for middle and high-rise, villa residents, and users with a large amount of hot water
✔Hot water for household floor type, radiator type, and fan type heating
✔All domestic hot water for car washing, washing, etc.
✔ Heating or cooling needs of commercial occasions such as households and shopping malls
✔Swimming pools and water play pools, hot springs or sauna pools, etc
What is air source heat pump system?
The heat pump system we call generally refers to the heat pump unit+ circulation system + terminal equipment, such as swimming pool heat pump system, house heating and cooling system, residential/commercial hot water system.
For example, a complete air source heating cooling heat pump system is similar to an air conditioning system except that they operate in reverse. The heat pump system consists of an outdoor unit connected to the indoor heating/cooling devices through pipes, such as water-floor heating, radiator, fan coil, boiler, water tank, etc. It only needs 1 part of electricity to drive the compressor to work, and the outdoor heat pump unit will absorb the free heat from the air, and transport it to the heat pump unit through the low GWP R410A / R32 / R290 refrigerant, and finally convert out 4 parts of heat to provide the needs of house heating/cooling. Its entire cycle is done in the form of air to water. Compared with the air conditioning system, boiler system, and water source or ground source heat pump system, the air source heat pump system can be used for multiple purposes and is more convenient to install that can be directly installed in the place where the outdoor air is circulated, and the user experience is better when in long-term operation.
According to the different terminal equipment connected to the unit, it can be divided into the following types:
Air source heat pump + Radiator system
Its output water temperature is about 55℃/131℉. Compared with the traditional equipment that directly uses electric heating, this heating method is more energy-saving and saves the cost of increasing the electric capacity. The radiator heats up as soon as it is turned on, the energy saving effect is remarkable, the installation is convenient and it is not affected by the ground. However, this solution is rarely used, because of high temperature heating, slow indoor temperature rise, poor thermal comfort, and occupying a certain space.
Air source heat pump + Fan coil system
Its output water temperature is about 45℃/113℉. Fan coil units generally use concealed ceilings, which do not occupy space in the living area, save space compared to exposed radiators, and the air outlet is mild, and the room temperature rises faster. Its output water temperature is lower than that of the radiator, and the energy efficiency of the air source heat pump is high. The fan coil units in each room are independently controlled, which is conducive to energy saving. If a heating/cooling air source heat pump unit is installed, the system can be used for dual purposes( Power World’s heat pump can be used for three purposes), warm in winter and cool in summer. Users who have cooling needs in summer can choose this solution, and the operating cost is low, the system is simple, and the installation is flexible and convenient.
Air source heat pump + Floor heating system
Its output water temperature is about 35℃/95℉. This is now generally considered to be one of the most comfortable heating methods for families, with energy-saving, low operating costs, uniform heating temperature in the house, and heating from the floor, so the indoor comfort is higher. The system has a certain heat storage function and good thermal stability, because the hot water temperature required for floor heating is generally around 40℃, and the efficiency of the hot water temperature of the air source heat pump is higher when the temperature is around 40℃. Effectively offset the fluctuation of the heating power of the air source heat pump under extreme weather, making the system more stable and reliable.
What is a monobloc heat pump system and split heat pump system?
According to the different integration densities of the heat pump, it can be divided into monoblock heat pumps and split heat pumps, they work the same, the main difference is that the installation and applicable environment are different. Since the split heat pump water system (such as heat exchanger and water circulation pump, etc.) is integrated into the indoor unit, in the extremely cold and harsh environment, compared with the monobloc heat pump of the same capacity and performance, the split heat pump has stronger antifreeze function. Take Power World’s air source monoblock and split heat pump as an example:
Power World’s Monoblock heat pump is a triple supply heat pump( heating, cooling and DHW function), it uses low GWP R32 refrigerant, Power World’s EVI DC inverter technology, intelligent defrosting, and multiple protection measures, especially the A+++ energy label tested by TUV that ensure the units can be stably run in extremely cold ambient temperatures as low as -30℃ and produce 55℃ hot water, which can meet the needs of house heating cooling and domestic hot water all year round. Not only can it connect floor heating, fan coil, radiator and solar system, but also boiler system (Based on the heating method of the boiler). In addition, its remote wifi function and room thermostat control can achieve a full smart home mode, and the extra two electric heater ports, one for heating, and another for hot water are specially designed for users with higher heating needs. And Power World’s split heat pump has the same function as monobloc heat pumps.
Such as the following installation diagram of the monoblock heat pump and split heat pump, the monobloc heat pump has only one unit and connects one water tank, and the split heat pump has two units, one is an outdoor unit and the other is an indoor unit, and it needs to contact one water tank and one buffer tank. When in summer, the outdoor unit absorbs the air energy and outputs the cold water, and then through the circulation system, heat exchange is carried out in the fan coil, and the cold air is blown out. When in winter, the outdoor unit outputs the hot water, and then through the circulation of hot water in the special heating pipe, the floor decoration layer is heated, and the floor is heated through the heat transfer of ground radiation and convection. The domestic hot water function can be realized by reversing the 3-way valve, but please note that when operating in heating/cooling+domestic hot water mode, the domestic hot water needs to be prioritized. This is a new heat pump on the market and the installation costs and long-term operating costs are definitely lower than other heating/cooling equipment.
Radiator system, fan coil system and floor heating system, which one has lower operating costs？
In general, the comparison of the overall operating cost of a heat pump system is that when the same heat pump equipment is used, the radiator method is the most expensive, the fan coil unit is the second, and the floor radiant heating cost is the lowest.
How to choose the terminal equipment of the air source heat pump system?
For new buildings, ground radiant heating is preferred. Radiators or fan coils can be used for renovation of existing buildings. If the radiators are old or the number of new additions is large, it is recommended to choose a low-temperature type fan coils unit. And the fan coil unit is a two-purpose terminal device, which can cool in summer and heat in winter, it has two types, one is a Floor-standing Fan Coil Unit, and the other is a cassette fan coil unit. It is recommended to use a Floor-standing Fan Coil Units.
How to calculate the required heat pump capacity?
The capacity of the heat pump is mainly determined according to the heating area of the house, the height of the floor, the thermal insulation of the wall, the thermal insulation and sealing of doors and windows, etc. Houses with a large heating area and poor thermal insulation generally choose a heat pump with a large capacity; houses with a small heating area and good thermal insulation can choose a heat pump with a smaller capacity.
The selection of heat pumps is not the bigger the capacity the better, the right one is the best. If the capacity of the heat pump is selected to be large, it is easy to cause frequent startup and shutdown, and the cost will be high, resulting in unnecessary waste; but if the capacity of the heat pump is selected to be small, the heating effect will not be achieved.
Selection and calculation of heat pump
The following selection calculations are for reference only:
- Floorheating: 80~90W/m2 (30~35℃ output water temps)
- Fan coil unit: 90-100W/m2 (40~45℃ output water temps)
- Radiator: 130-160w/m2 (This is the type selection when the house’s thermal insulation effect is good. If the house’s thermal insulation effect is not good, the capacity should be increased, and a higher outlet water temperature is required, preferably a heat pump above 60℃, especially the old radiator. If it is a radiator with a high heat dissipation effect, the water temperature is 55 to 60 ℃, and the hot water can slowly circulate in it to meet the heating needs of users.
For example, for a new building of 80 square meters, the insulation effect of the house is good. The terminal equipment connected to the heat pump is floor heating, and a heat pump of about 7.2KW is required. The calculation is as follows:
Ø 0.09KW/m2 X 80m2=7.2KW heating capacity
