How To Design Heating System For A Pharmaceutical Factory Dormitory Building

How to design heating system for a pharmaceutical factory dormitory building 2022-04-15

As we know that the simplest way to build heating system for hot water for dormitory is adopting boiler with coal burning ,which will cause CO2 increase for the earth. Here is the good example how to design the heating system with energy saving heat pumps to protect the environment.

pharmaceutical factory dormitory building

The project is the central air conditioning project and hot water project of a pharmaceutical factory dormitory building, canteen. The dormitory building has a total air conditioning area of 5700 square meters, 200 people and the canteen area of 1044 square meters. In the original design institute scheme, 14 air source heat pump units are used in the dormitory building, 4 air source heat pump units are used in the canteen, and the machine rooms are located on the roof of each building. Our company has optimized the system design:
(1) The dormitory building and canteen are combined into one system
(2) The system adopts air source multi-functional unit.

Project requirements

Name	Area	Air conditioning cooling load	Air conditioning heat load	Hot water load
Dormitory building	5700m2	615kw	308kw	800kw
canteen	1044m2	185kw	96kw	\

Project design

1. Cold and heat source design
The system adopts two sets of R1234ze air source multi-functional units, with a total refrigerating capacity of 614kw and a total heating capacity of 652kw, which are used for cold and hot water of air conditioning in dormitory buildings, canteens and sanitary hot water in dormitory buildings
2、 Supply and return water temperature ： 7 ℃ / 12 ℃ in summer and 45 ℃ / 40 ℃ in winter; Hot water 55 ℃ ；
3、 Water system design ： The closed mechanical circulation system is adopted, and two vertical circulating water pumps (one for use and one for standby) are selected.

Project configuration

Equipment name	Cooling capacity	Power	Heating capacity	Power	Heat recovery	quantity	remark
Air source multifunctional machine	307kw	90kw	326kw	85kw	123kw	2unit

Benefit analysis

（1） The air source multi-functional unit is adopted for the combination of the system, and the initial investment cost can be reduced by 25% ~ 30% 。
（2） The heat recovery capacity of the unit is 123kw / set, and the unit produces 55 ℃ hot water per hour ：M=Q/△T=123kw×1000×0.86/（55℃-15℃）=2.6m3/h， The two units produce a total of 5.2 tons of hot water per hour, saving at least 40% of the operation cost every year

Fuel mode	Fuel unit price	Theoretical calorific value	Comprehensive utilization rate	Hot water cost(RMB/T)	Maintenance cost(Ten thousand/yuan
Diesel boiler	6yuan/kg	10200kcal/kg	85%	27.6	6
Natural gas boiler	3.5yuan/m3	8600kcal/m3	75%	21.7	8
LPG boiler	5yuan/kg	10800kcal/kg	70%	26.5	7
Electric hot water boiler	1yuan/kwh	860kcal/kwh	90%	48.9	5
Heat recovery	--	----	--	0	0

Project advantages
（1） One machine with three functions and complete functions; Air conditioning and free domestic hot water are provided in summer, heating and domestic hot water are provided in winter, and domestic hot water is provided in transition seasons ；
（2） Microcomputer control, automatic switching between hot and cold working conditions ；
（3） Equipped with heat recovery, refrigeration and free sanitary hot water ；
（4） When the air conditioning of dormitory building and canteen is used in peak shift, the two systems are centralized into one system, which can reduce the load of equipment allocation, improve the utilization rate of equipment and reduce the initial investment cost ；
（5） The system is highly centralized, and one set of system can meet the needs of refrigeration, heating and hot water and reduce management costs ；
（6） The unit has compact structure, small floor area and simple installation; Reduce initial investment and equipment later maintenance costs
(7) Green energy saving R1234ze refrigerant , ODP is zero and GWP is almost 0.

Project system diagram

two vertical circulating water pumps Project system diagram