What's the wind and heat pump
“thermal pump” is a device capable of extracting low-grade thermal energy from the air, water or soil of nature, which, through electricity, provides high-grade thermal energy that can be used by people。
What is the wind of a cold heat pump, that is, the air that flows, that is, the heat pump that is a heater, that is, the air source heat pump is just set up, that the wind heat pump may speed up the air flow by equipment such as a wind machine, and that the air source heat pump is mostly natural。
The wind-cooled heat pump unit should be placed in a place where the air flow is good, i. E. He should be outdoors, indoors, the air is not flowing, and the air becomes colder and less efficient。
The working principles of the wind-cold-hot pumps
The wind cold thermal pump unit is the host of the air-conditioning system and, because the application of the wind cooler condensers does not require cooling towers, the evaporation unit is cold, cold water is provided during the summer cooling, hot water is provided during the winter heating, and the wind pipe is the end device of the air-conditioning system, which is installed indoors as a pump to pump water from low temperature to high temperature. So the heat pump is essentially a heat lifting device, which draws heat from the surrounding environment and transmits it to the object heated (higher temperature objects), operating in the same way as the chiller, which is less capable than the air source heat pump, working against the kano cycle, with an inflow temperature of about 5 degrees centigrade (most companies set parameters) and an inflow and outlet temperature difference of 40 degrees celsius。
Wind-cooled heat pump units, which provide cold or hot water, are used in conjunction with wind-crew tubes, while cold or hot water is exchanged by heat to suck out cold or hot. We can image the air-cooled heat pump unit as the central air conditioner brain, which, if the brain doesn't work, will lose all functionality and the system will stop running。
Guide to the selection of the wind and heat pumps
The cold load calculation method for the heat pump crew is similar to that for the conventional air conditioning system, and the heat load calculation method is approximately the same for the heating system, subject to new wind heating。
2. The selection shall be made with regard to the availability of sufficient local water sources (including water volume, water temperature and water quality), power and heat sources (including heat source properties, high grade)。
3. The temperature of water supplied by the wind cooling thermal pumps is generally 45°c, while the heating provided in samples such as the wind piping and modular air-conditioning units is generally premised on water intake at 60°c, so the heating of these equipment must be amended。
4. The selection of the heat pump unit shall normally be based on the winter heating load, while the cold load of the summer is verified。
5. For buildings with particularly heavy internal loads, such as malls, restaurants and new winds, heating loads typically cover only 60 to 70 per cent of cold loads. It is therefore advisable to use the combination of heat pump units and single chiller units, such as the “3x1” model, i. E. Three wind chiller pumps plus one single chiller unit。
The rated heat supply of the wind cold thermal pump unit is usually standard (environmental temperature t0 = 7°c, water output temperature ts = 45°c), which is significantly reduced when ambient temperature is below 7°c. The general decrease is approximately as follows:
T0 = 5°c with a percentage decrease of 5% - 8%
T0 = 3°c with a percentage decrease of 12% - 14%
T0 = 0°c with a percentage decrease of 25% - 32%
T0 = 3°c with a percentage decrease of 45% - 50%
At t0 = 5°c, the percentage decrease is 55% - 65%。
Note: wind-cooled heat pump units, designed for standard conditions, are in fact not functioning at less than 1 3°c。
The small single capacity of the wind cold thermal pumps is suitable for small and medium-sized engineering。
8. The air temperature outside the house is always higher during the winter than at night. Therefore, the outdoor heating calculation tw = 3°c area allows for the use of wind-heat pumps for buildings used only during the day, such as office buildings, malls, etc. For buildings that require heating throughout the day (24 hours), the use of cold and cold pumps should be treated with caution。
9. The water thermal pumping system is more suitable for multi-household apartment buildings and large villas. The design should ensure that the system flow calculation is accurate ... To facilitate the selection of equipment such as cooling towers, pumps, etc。
10. In areas with relatively high humidity, special attention should be paid to the analysis of operating conditions and the adoption of effective frosting measures when selecting heat pumps。
