Hot water engineering

Air source heat pump introduction 

5.1. Product introduction

Air-Source Heat Pump Hot Water Unit (Air-Source Heat Pump Hot Water Unit) is one of the best equipments in the world to develop and utilize new energy. Take the device. In today’s increasingly tight energy supply, air-energy heat pump hot water units have been rapidly promoted in the market due to their high efficiency, energy saving, environmental protection, safety and many other advantages.

Similar foreign products are quite mature, and some of them are used in developed countries as high as 70%. The application in Japan has been popularized. 60%-70% of domestic hot water projects use air energy heat pump water heaters, 30%-40% in Australia, and a large number of applications in Europe and America.

According to the principle of reverse Carnot cycle, the unit uses a small amount of electric energy as the driving force and the refrigerant as the carrier to continuously absorb the low-grade heat energy (-28-45℃) that is difficult to use in the air or the natural environment, and convert it into high-grade heat energy. Realize the transfer of low-temperature heat energy to high-temperature heat energy; then release high-grade heat energy into water to produce hot water (30-60°C), and deliver it to users through hot water supply pipelines to meet hot water supply and heating needs.

5.2. System principle

(1) System composition

The air energy heat pump central hot water system is generally composed of air energy heat pump hot water unit, thermal insulation water tank, water pump and corresponding pipeline valves. The air energy heat pump hot water unit is generally composed of a compressor, a water-side heat exchanger, an air-side heat exchanger, a throttling device, a low-pressure liquid storage tank, and a waterway regulating valve.

(2) System schematic diagram

(3) Working principle

According to the basic principle of inverse Carnot cycle:

★After the low-temperature and low-pressure refrigerant is throttled and depressurized by the expansion mechanism, it enters the air-side heat exchanger to evaporate and absorb heat, and absorb a large amount of heat Q2 from the air;

The refrigerant after evaporation and heat absorption enters the compressor in the form of gas, and after being compressed, it becomes a refrigerant of high temperature and high pressure (the heat contained in the refrigerant at this time is divided into two parts: one part is the heat absorbed from the air Q2 , part of which is the heat Q1 converted from the electrical energy input into the compressor when compressing the refrigerant;

★The compressed high-temperature and high-pressure refrigerant enters the water-side heat exchanger, and releases its heat (Q1+Q2) to the circulating water entering the water-side heat exchanger to heat the water;

★The refrigerant after exothermic enters into the expansion mechanism in liquid form, throttles down and reduces pressure…the cycle continues uninterrupted.

★The water in the heat preservation water tank continuously enters the water side heat exchanger to absorb heat through the circulating water pump, and stores the heat.

The heat Q3 obtained by the water in the heat preservation water tank = the heat Q2 absorbed by the refrigerant from the air + the heat Q1 converted from the electric energy driving the compressor, under standard conditions: Q2 = 3.2 Q1, that is, 1 part of electric energy is consumed, and 4.2 serving of calories.

5.3, the advantages of air energy heat pump products

★Input 1 degree of electricity, can produce 4 degrees of heat

★The operating cost is 1/4 of the electric water heater, 1/3 of the gas water heater, and 1/3 of the fuel water heater.

★Air energy heat pump water heater is an energy-saving product

★The air energy heat pump hot water unit produces hot water by absorbing the heat in the environment

★No burning effluent

★No pollution to the atmosphere and environment

★The energy consumption is extremely low, which belongs to the green environmental protection product

★No fuel pipeline and fuel storage, no fuel leakage, fire, explosion and other safety hazards

★When heating, it is only the heat transfer process of the working fluid in the system, no need to use electricity to contact with water, completely eliminating the hidden danger of electric shock

The unit is equipped with multiple safety protections such as exhaust temperature protection, high pressure protection, low pressure protection, compressor overcurrent and overload protection, start delay, water flow switch, water temperature ultra-high temperature protection, water tank water level protection, etc.

5.4. Main accessories of air energy heat pump products

5.5. Applicable places for air energy heat pump products

Actual program description:

Customer use requirements:

1. Hot water at the construction site, automatic constant pressure water supply.

2. To ensure a reasonable water temperature and stable water pressure.

3. Make sure that all workers can use hot water.

4. It is required to use air energy water heaters for heating, which is energy-saving, electricity-saving, green and environmentally friendly.

5. Water supply method: To prevent waste, use timed automatic water supply.

6. Outlet water temperature: 55°C (temperature up to 60°C).

 Site hot water engineering solutions:

1. Calculation of water consumption: bucket 25 kg/person/day

2. 2,000 people use water, and the daily water consumption is 2,000 people × 25 kg/person/day = 50 tons/day

3. Installation in the open space of the construction site: 2 25-horsepower air energy heat pumps, 2 25-ton thermal insulation water tanks,

4. 2 sets of air energy circulating pumps, 2 sets of pressurized pumps, 1 batch of pipelines and accessories, 1 batch of power cords, 1 set of control electrical boxes, etc.

School Water Program Explained

1. The school’s centralized water demand;

Ensure that every student can use hot water after class;

It is estimated that the amount of hot water is 30~60L per person × the number of people who use the water ≈ the demand for hot water.

A large insulated hot water tank is used to ensure the hot water needs of all students. (High-quality thermal insulation water tank, the temperature of hot water in 24 hours will drop below 3°C)​

2. Avoid wasting hot water;

Equipped with a backwater system, choose to use the IC card to supply water regularly, the backwater system can effectively reduce the waiting time for hot water to avoid the waste of cold water in the pipeline, and the timing of hot water supply and billing cards can effectively reduce the waste of hot water use.

1. The school’s centralized water demand;

Ensure that every student can use hot water after class;

It is estimated that the amount of hot water is 30~60L per person × the number of people who use the water ≈ the demand for hot water.

A large insulated hot water tank is used to ensure the hot water needs of all students. (High-quality thermal insulation water tank, the temperature of hot water in 24 hours will drop below 3°C)​

2. Avoid wasting hot water;

Equipped with a backwater system, choose to use the IC card to supply water regularly, the backwater system can effectively reduce the waiting time for hot water to avoid the waste of cold water in the pipeline, and the timing of hot water supply and billing cards can effectively reduce the waste of hot water use.

Energy saving of hot water supply in schools;

At present, the hot water equipment with excellent energy saving effect is mainly air energy hot water equipment and solar water heating equipment, and the electricity consumption is about 24% of that of electric water heaters.

Since solar energy relies on Yangguan to work, it cannot work in cloudy and rainy days, so it is generally necessary to use air energy as auxiliary heating equipment.

4. Management of hot water equipment in schools;

Compared with traditional water heaters, the air energy hot water system is fully automatic and intelligently controlled, and no special personnel are required to operate it. It can effectively increase the work efficiency of school equipment management personnel.

5. Noise control of hot water equipment;

Noise is one of the factors to be considered in large-scale hot water equipment. The installation of spring shock-proof pads can effectively suppress the noise generated by the resonance of the equipment and avoid the noise affecting students’ rest.

6. Safety of hot water equipment;

The school is densely populated, and the safety of equipment operation should be fully considered; because air energy and solar energy do not have problems such as electricity leakage and gas leakage, it is a relatively safe solution

School solar energy plus air energy hot water project customer needs

1. Install air energy + solar energy combination to achieve good energy saving effect

2. Need to meet the needs of 1,400 people in the school for centralized hot water use

3. The waiting time for hot water use should not be too long, and the water pressure should be stable

4. The whole hot water system runs automatically without manual operation

5. Improve the stability and safety as much as possible during the design and installation process, and reduce the cost of use and maintenance

6. It is necessary to take into account factors such as environmental protection, safety, convenience and efficiency

Implementation of school solar water heating project

1. It is necessary to meet the needs of 6,000 people in the school to use centralized hot water after class

2. Noise control of hot water equipment on the floor shall not affect the rest of dormitory teachers and students

3. In order to facilitate the management of school dormitories, the entire hot water system needs to be fully automatic and constant pressure and regular water supply.

4. Improve the stability and safety as much as possible during the design and installation process, and reduce the cost of use and maintenance

5. It is necessary to take into account factors such as environmental protection, safety, convenience and efficiency

1. The smart phone APP system keeps the air energy hot water system in the best operating state by detecting the changes in the water consumption of the system, and obtains an energy-saving experience beyond your imagination. The water temperature of the water tank, the water outlet temperature, the return water of the pipe network, the fault alarm, the timing switch, the timing water supply, etc. can be controlled anytime, anywhere. Reduce maintenance costs, monitor the running status of the hot water system in real time, and achieve zero-distance monitoring, simplifying life from time to time. Timing, temperature, water level functions, stagger the peak period of electricity consumption, and truly achieve the purpose of energy saving. The first time there is a fault, the SMS will be reminded, and there is no need to wait until there is no hot water and water to know that the equipment is broken. One person can easily manage N systems, which greatly saves people.

Applicable to: factory dormitories, schools, hotels, hospitals, apartments, construction sites, heated swimming pools and other places, 0 yuan design scheme