Brief introduction of heating and cooling triple heat pump system
Everyone knows that "refrigeration" is not just a simple cooling process. Compared with natural cooling, the "refrigeration" process actually consumes a certain amount of external energy (such as electricity, heat, solar energy, etc.) to remove heat from The process of transferring "low temperature heat source" to "high temperature heat source". Therefore, when the temperature of the refrigerant is reduced through "refrigeration", and the heat converted by external work is added, it will inevitably generate more heat than the cold capacity. In most current air conditioning designs, this part of the heat not only is not used, but also consumes the power of water pumps and fans to take the heat away by the cooling medium (water, air, etc.) through the condenser. If we can use this part of the heat, we can achieve one-way energy consumption and two-way output, greatly improve the energy efficiency of the refrigeration unit, and save the energy consumption of the cooling system.
1. The principle of heat recovery
Therefore, based on the starting point of energy reuse of the above system, the heating and cooling triple heat pump system (also known as hot water type air conditioner) has achieved good energy-saving effects. The system schematic diagram and related working principles are as follows:
During summer cooling, the entire triple-supply system follows the operating mode: ⑤→①→④→③→⑨→⑧→⑦→②→⑥→⑤, the refrigerant evaporates from liquid to low temperature and low pressure due to continuous absorption of heat from indoor air The gas becomes high temperature and high pressure through compression, and the released heat is absorbed and heated by cold water after passing through the heat exchanger. Since the specific volume of water is much larger than that of air, the use of this can increase the efficiency of the condensing system and heat the cold water. the goal of.
①Hot water heat exchanger ②Indoor heat exchanger (indoor unit)
③Outdoor heat exchanger (outdoor unit)④Four-way solenoid valve
⑤Compressor⑥Gas-liquid separator⑦Throttling device
⑧filter drier⑨liquid tank
In other seasons, since indoor refrigeration is not required, the whole system adopts the operation mode of ⑤→①→④→②→⑨→⑧→⑦→③→⑥→⑤. The heat exchanger is changed from indoor to outdoor, so that the system will remove the outdoor air. The heat in the air is transported to the indoor and hot water system to achieve the heating (or heating) goal.
2. Energy-saving characteristics
According to the law of conservation of energy: Q discharge = Q suction + Q pressure in the triple supply system. The heating efficiency of the unit, that is, the energy efficiency ratio (COP) is generally between 200% and 600%, and the average can reach 300% (affected by environmental conditions), while the heating efficiency z* of ordinary electric hot water equipment is only 95%, gas and fuel hot water The heating efficiency of the equipment is not more than 75%.
The triple-supply system uses the working principle of a heat pump for heating, which is the opposite of the principle of ordinary air-conditioning and refrigeration. And our country stipulates that the refrigeration standard is 2800 watts for 1000 watt electric refrigeration. According to the principle of heat balance, at the same time, z* produces 2800 watts less of heat, plus the input of 1000 watts, the actual heat generated is 3000-4000 watts. The heat is transferred to the thermal insulation water tank, and its power consumption is only four of the electric water heaters. One part (even if the thermal efficiency of the electric water heater is 100%, the input of 1000 watts of electricity will only have 1000 watts of heat)
Three and three-in-one heat pump systems have the following characteristics
1. As far as the air conditioning system is concerned, it is simple and reliable, no need to add other electronic control systems, high degree of automation, stable operation, and no safety hazards.
2. Adopt indirect heating method without any pollution discharge; multiple safety protections are installed in the unit, water and electricity are completely isolated, and safety hazards are completely eliminated. , It can realize multi-point water supply at the same time, which can meet the domestic hot water demand of different needs.
3. It is easy to install, not restricted by location, does not occupy effective building area, and does not need to set up another computer room.
4. Obtain free heat energy from the air, energy saving and environmental protection, low operating cost and high economic benefit.
5. Modular control is realized, and any combination can be made according to the needs. Different heating needs can choose different product series combinations and installation designs to meet user needs from different perspectives.
6. The main components are imported from Europe and America, and the outer shell is made of corrosion-resistant, ultra-thick coated steel or stainless steel. The equipment has stable performance and a service life of up to 15 years.
Fourth, the advantages of heat recovery air conditioning
1. The heat recovery system makes full use of the waste heat of the air-conditioning system and effectively uses the low-grade heat generated in the air-conditioning system to achieve the goal of energy saving.
2. The heat recovery system reduces the waste heat discharged to the environment; at the same time, because the cooling tower (central air conditioning system) can be eliminated, the noise around the building is reduced, and the environment around the building is effectively protected.
3. With the heat recovery system, users no longer need to set up a dedicated water heater, which brings convenience and safety to users; at the same time, waste heat is used to heat domestic hot water, which reduces the user's cost of using domestic hot water.
4. Compared with products such as electric or fuel-driven systems and gas water heaters (furnace), it has the advantages of no safety hazards, reliable operation, long service life, constant water outlet temperature, and simultaneous multi-point water supply.
5. Compared with solar water heaters, it has the advantages of not being restricted by the installation place, easy to install, no water leakage, safe, long life, all-weather hot water supply, and constant water temperature (no over-cooling or over-heating).
6. Compared with heat pump water heaters, it has a multi-purpose function. In addition to providing domestic hot water throughout the year, it can also provide indoor air conditioning throughout the year.
7. Compared with the air conditioner, it has a multi-purpose function. In addition to providing cold and hot air conditioning for the room throughout the year, it can also provide the room with constant temperature central hot water throughout the year. Flexible operation adjustment, simple pipeline system, high energy efficiency, and low operating cost.
