Analysis on Heating and Refrigeration Project of Office Building in Shunyi District, Beijing

This project type is the heating and cooling project of Beijing Shunyi District office building, with a building area of 800㎡. According to the practice, KDGD air energy group is used to realize the cold and heat source of office building, and fan coil unit is used as the cold and warm terminal.

In the design, according to the characteristics and advantages of air energy units, the heat load required by the units should be considered from the aspect of heating, and then the cooling load required from the aspect of refrigeration. In the hot area of Leng Xia in winter, the cooling load is often greater than the heating load for buildings, so the number of units needed in summer is greater than that used for heating in winter.

In terms of heating, according to the characteristics of office buildings, the working hours are regular, and the operation modes of regular start and regular shut-down can be adopted. A few hours before the start of work, the unit is started by the timing function, and then the room is heated and cooled, so as to reach a specific temperature when going to work and provide a comfortable environment. In the evening, before leaving work, shut down the machine and use the waste heat in the pipeline to keep the room in a certain temperature range. This mode of operation will reduce the running time of the machine, thus reducing the running cost.

Project content: design, supply, transportation, loading and unloading, construction and installation, operation and commissioning, acceptance, maintenance, warranty, personnel training and other related services of the heating and refrigeration system of air source heat pump units.

Heating temperature is 20±2℃ indoors in winter, 24±2℃ in summer, and hot water is adjustable at 30-55. The designer can meet the requirements of purchasing hot water for heating in winter and cooling in summer by field investigation in advance and fully considering the local climate. Configure KDGD air source pump(heating and cooling) unit as the cold and heat source equipment of this project; In order to ensure the applicability of the heating and cooling system design, a series of design and configuration schemes are compared and recommended for the heating system of the building, and finally the type of “air source heat pump+energy storage tank+fan coil” is adopted. The system design of this project started in November 2016, and was completed and debugged in mid-December, and it has been running normally up to now. The whole system has been running in a state of energy saving and high efficiency, and the indoor temperature has reached the technical index agreed in the contract. Operation cost is far lower than that of central heating.

The system design of this project started in November 2016, and was completed and debugged in mid-December, and it has been running normally up to now. The whole system has been running in a state of energy saving and high efficiency, and the indoor temperature has reached the technical index agreed in the contract. Operation cost is far lower than that of central heating.

  1. System design (air source heat pump) This central air conditioning project adopts KDGD air energy heat pump heating and cooling unit.
  2. Selection of heat pump units The equipment used this time belongs to air energy equipment, and the running capacity of the unit is closely related to the ambient air temperature, so different heat calculations should be carried out for different ambient temperatures. The heating capacity of air energy equipment units depends on the ambient temperature. The heating capacity of units varies with different ambient temperatures throughout the year. The heating capacity correction coefficient of units is taken as 1.0 under standard working conditions 3 water system design In this water system, “heat storage heat source water circulation heating mode” is adopted, and an energy storage water tank is designed, which is a heat exchange water tank. On the host side, the air source heat pump host circulates with small temperature difference and continuously heats the water in the water tank to keep the water temperature at the set temperature; On the use side, the water in the water tank provides heat for the indoor end and can guarantee the operating temperature difference of 5~8℃. The use of air can supply to hotels, hotels, schools and other places with large fluctuation of daily load, which has high controllability and good energy-saving effect, and has its unique advantages in heating. Good energy-saving effect and unique advantages in heating.

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