Since 2016, with the strong promotion of many favorable policies, gas heat pump heating products have suddenly emerged in Beijing’s “coal-to-gas” project and become the new main force.
1. GEHP heating principle
GEHP is an air conditioning system that uses natural gas as fuel, and uses the gas engine to drive the compressor to operate to form a vapor compression heat pump cycle, thereby realizing cooling/heating. It is composed of GEHP outdoor host, indoor unit, water system pipeline and control system. GEHP adopts a multi-unit model. The outdoor host is placed outdoors, and the indoor units are scattered in various rooms and connected through water system pipelines. When heating, the indoor unit dissipates heat into the room through cooling water to increase the indoor temperature. The evaporator in the outdoor host absorbs heat from the outside through vaporization; during cooling, the indoor unit absorbs heat in the room through chilled water and lowers the indoor temperature. The condenser in the host computer liquefies and releases heat to the environment.
2. How about the GEHP heating system
1. Comfort: GEHP uses water circulation and can be used indoors with three ends: floor heating, radiator and fan coil . When the water supply temperature is between 35℃-45℃, it can be used as floor heating water supply; when the water supply temperature is between 40℃-50℃, it can be used as fan coil water supply; when the water supply temperature is above 55℃, it can be used as heating system water supply. Floor heating has the highest comfort among the three methods. The heat is transferred from low to high, so that the temperature of the entire room can be evenly distributed. There is no feeling of hot wind, no dust, and no noise. It can also maintain a certain amount of moisture, which can prevent rheumatoid arthritis. The effect is in line with the physiological circulation effect of "warming the feet and cooling the head" as taught by traditional Chinese medicine, and the comfort is relatively high.
In addition, GEHP uses fan coil cooling in summer, and the air outlet temperature is between 15℃-20℃. Compared with ordinary air conditioners, the air outlet temperature is between 7℃-12℃, which will not produce too strong a cold feeling. It won't change the moisture in the room too much, the wind is softer, and the body feels more comfortable.
2. Energy saving: GEHP can produce hot water of 35℃-60℃. In terms of heating effect, the water supply temperature of 35℃-45℃ can already meet the indoor temperature of 18℃-22℃. Compared with ordinary gas, GEHP Wall-hung boilers and electric wall-hung boilers can produce lower temperature water supply, so the energy saving will be higher. The primary energy utilization rate of GEHP is 1.5. The gas engine drives the compressor to do work, and it can also use the waste heat of the engine and the waste heat of the flue gas to provide life. Hot water; GEHP absorbs free heat energy from the air, so it can obtain several times more heat energy. Compared with other heating equipment, air energy has great energy-saving advantages. In the same working environment, the cost of GEHP heating is only Gas wall-hung boiler heating is about 1/3, and electric wall-hung boiler heating is only about 1/4.
3. Long life: GEHP host uses thickened steel plate and waterproof coating. The parts of the heat pump host are also big brands with outstanding quality, so the service life is more than 15 years. Moreover, GEHP is versatile as a cooling and heating equipment. Different brands of water system equipment can be used interchangeably as long as the power is suitable. Unlike air conditioners, indoor and outdoor units must be the same. Once paired, product upgrades and replacements cannot be performed after the upgrade.
4. Stable performance: GEHP is not affected by the environment. It can operate all year round and is not affected by nights, cloudy days, rainy days, and snowy days. It can continuously produce hot water and supply it to indoor heating. GEHP can adapt to the low temperature environment of -25℃, and can operate stably, and can be used in most areas of our country.
5. Flexible local control system: This system adopts advanced local control technology. According to different local air conditioning performance requirements and different host operating loads, it ensures that the system always operates in an optimal state, improves energy conversion efficiency, and saves energy. .
6. Low noise: This system adopts the development of zigzag fan, which runs with low sound.
7. Strong environmental adaptability: In low temperature environments, due to the advantage of engine waste heat, the heating capacity attenuation is significantly less than that of air source electric heat pumps. It exerts the unique super heating capacity of the air source gas engine heat pump air system.
8. Easy to realize functional partitioning of air conditioning, hygiene, environmental protection and comfort: Since the system adopts one-to-many connection, the connection mode of configuring the system according to functional areas can be easily realized according to different functions to achieve high-quality energy supply. It can more effectively avoid the shortcomings of mutual infection between central air conditioning rooms.
3. About the installation location
The heating principle of GEHP is to generate heat energy by absorbing heat in the air, so the ambient temperature is very important. When installing GEHP equipment, you must choose a sunny and ventilated place. The higher the ambient temperature, the better the GEHP heating. The faster, the better the effect and the lower the energy consumption. On the contrary, the lower the ambient temperature, the slower the heating and the higher the energy consumption.
1. Do not install it in low-lying areas and air vents: When installing a heat pump heating unit, not only will it not work if it is too high, but it will also cause problems if it is too low. It is understood that some businesses have had machines go out of action because the installation position of the machine was too low. Due to the accumulation of rainwater in low-lying areas and the low temperature, the condensate water cannot flow out after the machine defrosts, and it accumulates at the bottom of the machine. In the end, the entire unit All frozen.
2. There is a difference in the proportion of machines between facing the sun and facing the yin: The orientation of the building is also a key issue. There is also a difference in the proportion of machines between the house facing the sun and the yin. Based on years of experience, the matching ratio of Xiangyang and Xiangyin is approximately 1:1.15.
Moreover, the installation position is facing the sun or facing the yin, which sometimes affects the normal operation of the machine. We know that the temperature in the shady location is generally lower. When the ambient temperature is lower, the unit in the shady location is more likely to frost, and the defrost speed will also be affected. In severe cases, the unit will be scrapped.
In addition, there are the following points:
(1). When placing the host, the position of the unit must be adjusted in time to ensure that the host is placed stably;
(2). The waterway system is mainly between the host and the water tank. The connections of water pumps, valve bodies, filters and other components must be accurate;
(3). Take measures to prevent rain and snow on the equipment. The pipes should be equipped with an insulation layer. The thickness of the insulation layer should meet the design requirements, and the insulation layer The bond with the pipes should be firm. Insulated pipes located in trenches and humid environments should have moisture-proof layers, and the moisture-proof layer should be complete without gaps to prevent energy loss and the formation of condensation and ensure the effectiveness of the heating system;
( 4). Water circuit pressure test, detect whether there is leakage in the pipeline connection;
(5). Machine trial run, check various parameters of the system;
(6). Pipe insulation, such as using rubber and plastic The thermal insulation material insulates the waterway system.
