I. Project Introduction
With the development of society, the requirements of environmental protection are getting higher and higher, coal-fired boilers and biomass boilers are gradually eliminated, and air-source heat pumps are gradually becoming the most ideal substitutes.

II. The climate
Average annual temperature: 13.5℃
Outdoor calculated temperature of air conditioning in winter: -6.8℃
Outdoor calculated relative humidity of air conditioning in winter: 62
Extreme lower temperature: -14.3℃

III. Engineering design
Temperature, humidity and other requirements of chicken growth
1. Chickens 1-2 days old: Chickens should be sent to the chicken house as soon as possible after being transported. The temperature in the house should be kept above 35℃ and the relative humidity should be 70% during the first 1-2 days of brooding. The first 2 days should be illuminated 24 hours a day with 40w incandescent bulbs;
2. Chicken 3-4 days old: From the third day, the temperature in the house will be reduced to 32℃, and the relative humidity will be kept between 65-70%;
3. Chickens are 5-7 days old: on the 5th day, the indoor temperature is adjusted to 32-30℃, and the relative humidity is kept at 65%. Feed 6 times a day, turn off the lights for 2 hours at night and keep the illumination time for 22 hours. From the seventh day, the net bed area was expanded to keep 35 chickens per square meter;
4. Chickens are 8-14 days old: the temperature of the chicken house is reduced to 29℃ from the eighth day;
5.15-22 days old: the temperature of the chicken house should gradually drop from 28℃ on the 15th day to 26℃ on the 22nd day old, and the temperature should drop by 1℃ within two days, and the humidity should be controlled at 50-55%;
6.23-26 days old: at the age of 26 days, the indoor temperature is reduced to 25℃ and the humidity is controlled at 45-50%;
7.27-34 days old: the room temperature should be reduced from 25℃ to 23℃, and the humidity should be kept at 40-45%;
8.35 days old-slaughter: from 36 days old, the temperature of chicken house will be reduced to 22℃. 24 hours of light should be kept every day from 35 days old to slaughter, in order to increase the feed intake of chickens, increase the weight gain speed and slaughter early. At the age of 37 days, chickens are disinfected once, and at the age of 40 days, the temperature of the chicken house is reduced to 21℃ and kept until it is released. It usually takes 42 days for a batch of chickens and about 15 days between two batches of chickens. Cleaning, disinfection, data preparation and preheating generally ensure that 5-7 batches of chickens will be released in one year.
According to the relevant requirements of chicken house brooding management, it can be seen that the standard process temperature of chicken house is 19℃-35℃. The temperature must reach 33-35℃ within one week of brooding, and drop by 2℃ every week after the seventh day and finally reach about 20℃; With the increase of age, the self-heating increases, and the self-heating in the later period can meet the requirements of room temperature, so it is not necessary to supply heat.

IV. Engineering Configuration
Heating equipment adopts special air source heat pump for breeding; Fan coil is used at the end.
The change of the whole indoor temperature is controlled by full automation, which can keep the air flowing and effectively reduce the heat loss without manual adjustment.

V. Project Highlights
1. Automatic temperature adjustment
The unit can be automatically adjusted according to the temperature, which meets the temperature requirements of culture without manual adjustment, thus greatly saving time and labor costs.

2. Environmental protection and no pollution
The air can not discharge toxic gases in the running process, and will not pollute the environment, and will not affect the healthy growth of chickens.