Comparison between refrigerant system and water system

Last Updated on April 11, 2022 by Shawn Lee

The project is located in Beijing, with a typical northern climate. This project is a temporary living area on the construction site, and its main functions are accommodation and office.

Through on-site investigation, communication with Party A, and drawing, it is known that there are 450 rooms with 18㎡ in this project, which need to meet the needs of cooling in summer and heating in winter.

After the accounting data of the technical department, the conclusion is drawn: adopting an air energy central air conditioning system is more energy-saving and money-saving!

First: The difference in working principles

Second: The comfort difference

Third: Difference in the host operating temperature range

Fourth: Maintenance differences

Five: The service life difference

Sixth: Economic differences

The operating cost of the traditional split air conditioner is more than twice that of the air-powered central air condi,air-powered central air conditioner saves 764,172 yuan a year.

According to the actual situation at present, two schemes of traditional split air conditioning and new air energy can be adopted. Now, the two schemes are compared and analyzed:

First: The difference in working principles
A split air conditioner works on the same principle as air energy, which provides indoor cold and heat sources through heat exchange with outside air.

However, the heat exchange medium in the final process is different. Traditional split air conditioner always uses refrigerant as the medium, and although air energy transfers heat through refrigerant, air energy uses water for heat exchange in the final heat exchange stage.

That is to say, air conditioning is a fluorine system cycle, while air energy is a water system cycle, which is commonly referred to as fluorine machine and water machine.

Second: The comfort difference
No matter whether it is cooling or heating, the fluorine systems will absorb a lot of water from the air, resulting in dry air, which will make people have a hoarse throat and dry mouth, especially in winter.

However, there is no such problem in the water system, so the overall humidity is more in line with human physiological habits, and will not cause “air conditioning diseases” such as the dry mouth.

Traditional split air conditioners are instant-opening, and when cooling or heating is needed, they can be turned on.

When the indoor temperature reaches our requirements, once the indoor temperature is turned off, it will soon approach the outdoor temperature, so “the machine can’t be turned off”.

Basically, the air conditioner is always on when there are people in the room, so it is in the process of being cold or hot for a long time;

However, air energy is different. Air energy can be exchanged by a large-scale water system. When cooling or heating is needed, it can be turned on.

When the indoor temperature reaches our requirements, the host system will automatically shut down. The cold water in the system is still circulating under the impetus of the circulating water pump, which can still maintain the internal temperature for a long time.

The indoor temperature is basically the same, and it is in the preset temperature process that we need for a long time. Therefore, air energy is more comfortable than the traditional split air conditioner!

The outlet temperature of a traditional air conditioner is about 3 degrees in summer and higher than 60 degrees in winter, which are not acceptable to the human body, so it can’t be blown directly.

However, the outlet temperature of air energy is about 10 degrees in summer and about 35 degrees in winter, which are all suitable temperatures, and there is no discomfort when it blows directly on the human body, so the air energy is more comfortable than the traditional split air conditioner!

air-source-heat-pump4
air-source-heat-pump

Third: Difference in the host operating temperature range
The working temperature range of the traditional split air conditioner is generally -7℃~43℃, which means that the split air conditioner can’t work when it is lower than -7℃.

In fact, split air conditioners are difficult to heat at 0℃, and most of them use electric auxiliary heating at this time.

Generally, there are electric auxiliary function keys on the remote controller of the air conditioner.

Therefore, the traditional split air conditioner consumes electricity and has low heating capacity in winter.
However, the water system working range of air energy(DC variable frequency air-cooled module heat pump unit) is generally -25℃~43℃, and the unit adopts enhanced vapor injection technology, which can absorb heat from the outdoor air in winter so that 3~4 parts of heat can be produced by consumption of one part of electricity.

Therefore, the air energy can meet the heating demand in northern winter, and it is very energy-saving.


Fourth: Maintenance differences
Because the traditional air conditioner is a fluorine system, it belongs to a closed high-temperature and high-pressure system, which is troublesome to maintain;

The air energy central air conditioning system is an open water system, which is extremely simple to maintain.

Five: The service life difference
The service life of a traditional split air conditioner is 7-8 years; The service life of an air energy central air conditioner is longer than 15 years.

Sixth: Economic differences
When split air conditioners are used, we need to install 300 split air conditioners. The cooling power of a single air conditioner is 1KW in summer and 1.5KW in winter.

When the air energy central air conditioning system is adopted, we need to install 4 sets of 130-module machines, 300 sets of indoor fan coils, and a circulating water pump with a power of 11KW.

Calculate the operating cost according to the air conditioning working time of 10 hours per day, the cooling cycle of 90 days, the heating cycle of 120 days, and the electricity of 1 yuan/kWh:

  1. The total operating cost of split air conditioning refrigeration cycle operation:
    1KW×450 units× 90 days× 10 hours× 1 yuan/kWh = 405,000 yuan.
    Total operating cost of split air conditioning heating cycle operation:
    1.5KW×450 units× 120 days× 10 hours× 1 yuan/kWh = 810,000 yuan
  2. Total operating cost of refrigeration cycle of central air conditioning system:
    40.2KW×6 units× 90 days× 10 hours× 0.7 (full load operation coefficient )× 1 yuan/kWh +15KW×10 hours× 90 days× 1 yuan/kWh +0.052KW×450 units× 10 hours× 90 days× 1 yuan/kWh = 151,956 yuan+13,500 yuan.
  3. The total operating cost of refrigeration cycle of central air conditioning system:
    3.3 kW× 6 units× 120 days× 10 hours× 0.7 (full load operation coefficient )× 1 yuan/kWh +15KW×10 hours× 120 days× 1 yuan/kWh +0.052KW×450 units× 10 hours× 120 days× 1 yuan/kWh = 218,232 yuan+18,000 yuan.

Through the above calculation, we get the following operating expenses:

From this analysis, it can be concluded that the operating cost of the traditional split air conditioner is more than twice that of the air-powered central air conditioner, and the air-powered central air conditioner saves 764,172 yuan a year compared with the traditional split air conditioner.

Therefore, adopting an air energy central air conditioning system is more energy-saving and money-saving!

To sum up, it is more reasonable to adopt an air energy central air conditioning system in this project!

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