I. Advantages of special breeding heater:
1, The air volume is larger than that of the fan coil unit, the wind pressure is smaller, and it is suitable for heating in tall spaces
2, High heat

3, The traditional air heater is the rear return air, so the panel needs to be disassembled for cleaning, but the fan for breeding is the side return air, so it can be washed directly, which is convenient for cleaning

4, The volume is light and thin, the floor area is small, and the installation is convenient and quick

5, Large air volume, high heat, and energy saving

Air-source heat pump and different types of fan coil units for aquaculture have the advantages of energy-saving, uniform heating, and intelligent control.

In addition, the service life is longer than that of general electric heating mode. Air source heat pump plus heater has become important equipment to reduce coal and replace coal in the livestock and poultry breeding industry, and air source heat pump will become a new heating protagonist in the livestock and poultry breeding industry!

Second, Overview of the Project：
Project Name: Pig Farm Project Address: Hebei, China
Total construction area: 2,400 m2 Room type: breeding greenhouse.
Heating area: 2400 m2 Wall: brick-concrete 24cm foam brick.
Refrigeration area: 2400 m2 Heat source: air source heat pump

Terminal equipment: special heater for breeding.
Demand for energy: cooling in summer and heating in winter.

III. the design ideas：
The foundry group mainly provides precision machines and parts processing and casting for various countries, so the workshop has high requirements for the ambient temperature and the parts processing

The pig farm was founded in 2020. Each greenhouse covers an area of about 800 square meters, with three in total. The company has established a production management system integrating breeding, production, and disease prevention and control of breeding pigs; With Large-scale management, refined operation, standardized production, and data management, the breeding pig production performance has reached an advanced level at present.

According to the size of piglets in pig farms, different heating temperatures should be set, and different temperatures should be provided by season, time, and region. Before piglets enter the pigsty, the indoor temperature should be kept at 26℃, and the temperature should be lowered every 10-15 days according to the size of the piglets.

In this scheme, the heat source part adopts an air source heat pump for heating, with a low temperature of -30℃ for heating and a high temperature of 55℃ for effluent; The reasonable heater at the end of the new-style piggery backup shed, new-style nursery shed and new-style delivery shed matches the special heater for breeding, providing a suitable living environment for piglets.

IV. Design Basis

1. According to the meteorological data of Hebei Province;  
2. Technical Code for Design, Installation, and Engineering Acceptance of Heat Pump Heating System (GB/T 8713-2002);
3. According to the meteorological data of Hebei Province;  
4. Technical Code for Design, Installation, and Engineering Acceptance of Heat Pump Heating System (GB/T 8713-2002);
5. Code for Acceptance of Construction Quality of Building Water Supply and Drainage and Heating Engineering (GB50242-2002)；);
6. Design and Installation of Air Source Heat Pump Heating and Hot Water System GB/T 15513-1995;
7. Code for Design of Building Water Supply and Drainage (GB/T 50015-2003);
8. Drawing Standard for Water Supply and Drainage (GB/T 50019-2003);
9. Design Manual of Heating, Ventilation, and Air Conditioning
10. This design is to adjust and control the temperature, humidity, cleanliness, and air velocity in a room or space after calculation according to the local climate, environment, and buildings, so as to create a safe, environmentally friendly, comfortable, and energy-saving harmonious environment for users.

V. Calculation parameters
Table 1 Calculation parameters of the outdoor design in summer in Hebei

Table 1 Calculation parameters of the outdoor design in winter in Hebei

Table 2 Calculation parameters of indoor design in winter

VI. Calculation of cooling and heating load

For the selection of ultra-low temperature air source heat pump, according to the Design Manual of Heating, Ventilation, and Air Conditioning, the heating heat load consists of the basic heat consumption of the outer envelope and the inner envelope, its additional heat consumption, and the cold air infiltration heat consumption, and the design unit heat load index is 180W/㎡ according to the outdoor temperature parameters of Hebei.

1. Determination of heat load;
               Q=2400×180=432kw
   According to the characteristics of buildings and climatic conditions, the output heat of ultra-low temperature air source heat pump for heating under the average minimum temperature of -7℃ should be ≥432kw to meet the use requirements.

Seven. Analysis of Operating Expenses
Forecast the heating energy consumption and calculate the total power consumption.

According to the daily heating operation of 6 hours and the heating season of 120 days, the electricity price of 0.8 yuan/kWh is equivalent to the operating cost per square meter (the whole heating season), and the indoor temperature reaches 26℃ 2℃.

The following predicted energy consumption does not include the operating energy consumption of the circulating water pump.