Air Source Heat Pump Hot Spring Heating Design Scheme of Sanzheng Mid-Levels Hotel Dongguan China

Located in the center of Tangxia Town, Dongguan, Sanzheng Mid-Levels Hotel Dongguan is carefully built in accordance with international super five-star standards. The total area of the International Conference Center of Mid-Levels Hotel Tangxia is about 7,000 square meters, with 6 advanced equipment of various types. The conference room can hold 600 people for various meetings at the same time, and has more than 500 guest rooms, suites and villas. The hotel is surrounded by green mountains and green waters, with lakes and mountains in front of your eyes. The fragrance of birds and flowers all year round is like a paradise on earth. It corresponds to the hotel's service concept of "away from the hustle and bustle of the city and enjoy a quiet life", giving every guest an experience that touches the soul.

The project hotel has two springs. The maximum reception capacity of the hot spring pool area is 3000 people/day, the water consumption of the hot spring is 600-700 tons/day, the water temperature at the spring is 45℃, and the water temperature at the cold water tank supplied to the hot spring is 35 under normal conditions. ℃, the cold hot spring water is heated to 75℃ to 80℃ by air source heat pump and stored in the high temperature hot spring water tank. In order to meet the national coal-to-electricity general trend and environmental protection requirements, the current heat source side adopts 12 "Central Europe Mango" environmentally friendly high-temperature air source heat pump units MGK-600II (60P), using plate heat exchangers for secondary heat exchange to heat hot spring water. Pollution-free hot spring water.

Project introduction

1. Calculation of total daily water consumption and heat consumption:
According to the climatic conditions, the average surface water temperature is calculated at 35℃ throughout the year under low temperature conditions, and the hot spring water consumption is calculated at 600 tons/day:
So the total hot water consumption is: M=600×10^3L
Q hot water = CM△t
=4.2×10^3j/(kg·℃)×(600×10^3)L×(75℃-35℃) (heat 35℃ hot water to 75℃)
=1.008×10^11j
=28000 degrees (kW·h)
[Note: Q: Daily heat consumption (Joule), c: Specific heat of water   take 4.2×10^3j/(kg·℃), M: Total water consumption per day kg (L), △t: Temperature difference]

2. Equipment selection and check:
According to the heat production principle and characteristics of the heat pump, its hourly heat production varies with the external working conditions. The lower the outdoor wet bulb temperature, the lower the heat production. The outdoor wet bulb temperature is different in different regions, so the heat pump unit selection It is necessary to correct the heat production, and select the model based on the heat production under the coldest working condition. According to the characteristics of Guangdong, the outdoor wet bulb temperature of the coldest working condition in Dongguan is 13℃, so the heating correction coefficient of the heat pump is 0.80, and the calculated temperature of hot spring water is calculated at 35℃.

The nominal heating capacity of the unit under the most unfavorable conditions P= Q hot water ÷ 12H×0.80=1866.67kW.

Under the premise of satisfying the use of water, in order to reduce the initial investment of equipment and comprehensively consider various factors, 12 sets of "Central Europe Mango" environmentally friendly high-temperature air source heat pump unit MGK-600II (60P) were selected, and the heating capacity of a single unit was 160kW. The heating capacity is 1920kW.

1920kW (actual heating capacity)> 1866kW (theoretical calculation of heat consumption)

Therefore, the equipment selection can meet the hot water use throughout the year.


1. System hydraulic calculation (water pump selection calculation)
1) Calculation of pump flow
Q=Q1, Q1 design hourly water volume

2) Pump Yang Cheng calculation H=H1+H2+H3
H1: Head loss along the way
H2: local head loss;
H3: Loss of remaining head

3) Calculation of head loss along the way
h=ALQ^2 (MH20) A: Pipe specific resistance value L: Calculate pipe section length (M) Q: Calculate pipe section flow rate (L/S)

4) Calculation of local head loss
Take 35% of the local head loss along the way
After calculation, three pumps with a flow rate of 150m^3/h and a head of 18m were finally selected, and the effect was very good.

2. Leakage protection instructions
Our company has made a comprehensive leakage protection design for this program.

3. Fire protection instructions
All structural parts of the system are made of non-combustible or non-combustible materials, and the layout of the floor engineering ensures smooth fire-fighting passages.

4. Description of wind and earthquake resistance
When the system structure is designed, the standard is based on the anti-twelve typhoon and the seismic and fission resistance octave.

5. Water tightness description
The unit and the thermal insulation water tank have passed the water pressure and water tightness test before leaving the factory. After the on-site installation, the pressure-bearing capacity and air-tightness test shall be carried out in accordance with the relevant provisions of the National Code for Pipeline Engineering Construction and Acceptance. /cm2 is qualified if it meets the standard.

6. Description of anti-corrosion and anti-scaling properties
The internal water of the unit is all made of copper pipes; the inner and outer tanks of the heat preservation water tank are all made of SUS304 stainless steel imported from Japan or South Korea. According to the requirements of winter, it is made of imported polyurethane integral foam with a foam thickness of 70 mm; the cold and hot water pipes are made of PP- R national standard parts, on-site cold work and on-site welding seam brushing anti-rust paint treatment; the system hot water pipe insulation layer adopts EPS rubber and plastic pipes, and the insulation pipe thickness is up to 30 mm.

7. Environmental protection description

During the circulating heating process of the system water quality, most of the contaminants settle on the bottom of the collector and hot water storage tank under the action of gravity, which has no impact on the health of users, and there is no impact on the environment during regular (three-month) sewage discharge. Any impact.

Project construction plan

1. Construction scope:
1) The heat pump central hot water system project includes the main project and auxiliary projects. The main engine project is mainly composed of a heat pump main engine, a stainless steel heat storage and heat preservation water tank, a water tank frame and a base, etc. The auxiliary project mainly consists of electric auxiliary, heat preservation and windproof projects in winter.
2) This project is a full-floor project, including materials, processing, installation costs, transportation, design and other projects.

2. Construction organization:
The engineering department of our company is responsible for the organization and installation of the project. The engineering department has sufficient technical force and construction experience to complete the heat pump hot water project. When the project enters the tight schedule, the company can send additional personnel at any time.

3. Quality and safety assurance measures:
In order to ensure that the acceptance rate of the project is 100%, it reaches good standards. Take the following measures:

1) Key process control:
a) The concealed project can only be closed after passing the supervisor or Party A's acceptance of the visa.
b) Before the water pressure test of the pipeline, the system is repeatedly flushed until the water is clear.

2) Important process control:
a) When installing the pipeline, first clean up the garbage in the pipeline. During installation, prevent molten slag from falling into the pipeline. Seal the installed pipeline opening tightly to prevent building garbage from entering the pipeline.
b) Pipe wire connection: determine the direction and elevation of the elastic wire, fix the size, screen the pipe fittings, adjust the level or verticality when installing the pipe, and use moderate force when wire connection.
c) Heat preservation: The pipe heat preservation is characterized by heat insulation and anti-condensation; to ensure its tightness, the characteristic is to prevent cold bridges at the bracket.

3) Construct in strict accordance with the design drawings and contract regulations.

4. Project acceptance
(1) The overall appearance of the heat pump project is coordinated, and the structure is compact and reasonable.
(2) The appearance of the main engine, water tank, pipeline, valve and control system has no obvious defects.
(3) Leak-proof inspection: After the system is filled with water, it runs normally, and there is no water leakage as qualified.
(4) Heat production inspection: the system device runs continuously for two days, and the heat production index meets the contract requirements as qualified.

5. Construction period (progress) arrangement
All the products of our company have reserved interfaces. Only simple series and parallel connections are required on site. After the contract is signed, enter the construction site on the date required by Party A. The construction period shall be carried out in accordance with the requirements of the contract.

6. Project coordination
Our company will send a special person (Party B's representative) to work closely with your personnel. If you need your cooperation and support during the construction process, you will be notified in advance to obtain understanding and support. If we need to provide convenience and support during civil construction, we should fully cooperate in time, especially on the waterproof and heat-insulating layer on the roof of the building. We should improve all quality, beauty, and cleanliness work according to your requirements.

7. House on site (site)
In addition to roof work, a material warehouse must be provided to us. In addition, in the process of hoisting and transporting materials, equipment, and construction, it is still necessary to occupy a part of the public construction site within the schedule.

8. Staffing and transportation
Staffing: Party B will deploy site personnel based on various reasons such as construction period and project intensity.

9. Construction procedures:
On-site inspection-laying line-approved size-host basic positioning-water storage incubator basic positioning-insulation water tank production and installation-water pipe positioning, production and installation ----Other accessories positioning installation----host installation, water pipe connection----cleaning system----water filling test pressure----water pipe insulation----electrical connection----debugging.

Equipment installation and construction methods and requirements:
1) Installation of heat pump hot water unit
A. Check the name, model, specification, packing box number, number of boxes and check the packing condition of the equipment.
B. Check whether the random technical data and special accessories are complete.
C. The heat pump hot water unit can be installed on the roof or the ground level. The heat pump hot water unit should be installed at an appropriate distance from the adjacent wall to prevent air circulation and affect the heating effect of the heat pump hot water unit, and it is also convenient for maintenance.
D. There is certain vibration and noise when the heat pump hot water unit is running. The heat pump hot water unit must be installed firmly and reliably, with the bottom horizontally placed and the inclination angle not greater than 5 degrees. The unit can be directly bolted to the foundation of the main engine. The base of the main engine can be prefabricated with cement to reserve drainage channels, or angle steel can be used to make brackets and shock-proof rubber pads, placed on the ground, and the bottom should be able to bear the weight of the unit.
E. If the heat pump hot water unit needs to install a shock absorber, it should be installed, aligned and leveled in strict accordance with the design requirements of the model, quantity and location.
F. Unpacking inspection of the heat pump hot water unit, the equipment should be free from missing parts, damage and corrosion, and the nozzle protection and filling cover should be intact;
G. The heat pump hot water unit should not be near flammable, explosive, open flame, polluted, corrosive gas, dust, fallen leaves, etc.

2) Installation of water storage and heat preservation tank
A. The water storage tank adopts a circular heat preservation water tank (the inner layer of the heat preservation water tank uses a 50mm thick heat preservation layer). When installing the water storage tank, the inner and outer stainless steel surfaces should not be scratched (if the inner and outer stainless steel surfaces are scratched, the paint should be washed).
B. When installing the circular heat preservation water tank, the base of the heat preservation water tank can be made of concrete structure or channel steel. The bracket is higher than 200mm above the ground level (it can bear the gravity after the water tank is filled). The channel steel bracket should be washed with anti-rust paint.
C. Set the inlet and outlet pipes of the heat pump hot water unit, the outlet and return pipes of the hot water supply, and the supplementary cold water pipes for the heat preservation water tank.

3) Water pipe installation
A. The installation of heat pump water heater pipes must comply with the "Code for Construction and Acceptance of Indoor Sanitary Engineering" issued by the Ministry of Metallurgy
B. Water pipe installation should be installed according to the size of the water pipe specified in the construction drawings.
C. Before installing the water pipe, remove the debris in the pipe, and place the detachable connection of the pipe in the place for maintenance.
D. The inclination and slope of the pipes connected between the equipment must meet the design requirements.
E. The layout of the heat pump hot water unit and the direction of the water pipes, according to the actual situation on the site, we coordinate with the user, in principle, it is advisable to have a beautiful layout, cost-saving, easy maintenance, and no adverse effect on the operation of the unit.

4) Water pump installation
A. The foundation of the pump can be made of concrete or angle steel with a bracket that is more than 100mm above the ground level. Drainage ditch is reserved. The pump is fixed on the foundation and installed horizontally.
B. The direction of the inlet and outlet of the water pump cannot be reversed.

5) Valve installation
A. The installation position, direction and height of the valve must meet the design requirements, and no reverse installation is allowed.
B. The automatic exhaust valve method must be correct, and the discharge port must face a safe zone.

6) Electrical installation
A. The electric wire of the heat pump hot water unit should adopt PVC line pipe sleeve.
B. The wiring arrangement cannot be close to wet places.

7) Test pressure and clean the water pipe system
A. The water piping system adopts irrigation test pressure.
B. Rinse the water pipe with water until there is no debris and clean, and remove and wash the Y-type filter.

8) Pipe insulation
Water pipe insulation adopts 20mm thick PE rubber and plastic insulation, and external bright aluminum skin or PVC pipe protection.

Project Design drawings

Project site map