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brass capillary tube

author:MF manufacturerstime:2022-03-11 01:07:37

from2018Year to first half of this year,The air source heat pump cooling and heating market has become the focus of enterprises and distributors in the entire industry,In addition to our common co-supply system of floor heating and air-pan cooling,Capillary radiation cooling and heating have also been more and more widely used。What are the advantages of capillary radiation systems?What are design essentials?What problems should be paid attention to when designing and installing?


brass capillary tube


(brass capillary tube)The following is Liang Zhong, a lecturer at Heat Pump Business School, based on his actual experience,It is common to summarize13Q&A,Take you to a comprehensive understanding and understanding of the capillary radiation system。

1.ask:Will there be condensation on the cold radiant surface??

answer:The radiation surface temperature of the radiation system is generally lower than the dew point.,This scheme adopts a reasonable and effective dehumidification system,The cold radiant surface temperature can be guaranteed to be always higher than the dew point,At the same time, dew point temperature protectors are installed at the unfavorable points of each room.,When a danger of condensation is detected,The system will automatically shut down,Make sure nothing goes wrong。

1)High temperature cold source:The system adopts18℃high temperature cold water,At the same time, ensure that the capillary network is laid with sufficient area。

2)humidity control:Utilize fresh air condensation dehumidification system,Ensure proper humidity in indoor air,Keep the dew point temperature below the cold radiant surface temperature。

3)Dew point protection thermostat:Each room is equipped with dew point temperature protection system,Smart room temperature control。


brass capillary tube


(brass capillary tube)2.ask:Will the capillary network be blocked??

(brass capillary tube)answer:in rational design、under construction,No blockage of capillary network,The reasons are as follows:

1)fouling problem:water temperature greater than60℃in the case of,Calcium and magnesium ions in the water will be precipitated,scale formation,The water temperature range required for the capillary network system is18℃~40℃,There will be no scaling problems。at the same time,Because the inner wall of the capillary network is very smooth,Even if there is slight scale formation,no blockage,According to the use of Tsinghua University's energy-saving building for many years,The system does not have the problem of blockage due to scaling。

2)Large particle blockage:The system is equipped with a small filter device,Prevents large particles from entering the capillary。

3)Influence of other pipes in the system on the capillary network:for large systems,Independent circulation system is generally used in the design,Isolated from the larger system by a plate heat exchanger。

4)Corrosion resistance:The system uses corrosion-resistant piping and valve components,PPRMaterial corrosion resistance is very good,Long-term resistance to acid and alkali solutions(PHvalue1~14)。Sub-collectors are forged brass nickel-plated inside and out,It can effectively prevent the corrosion of copper ions to plastic pipes。

5)Bio slime:To prevent the formation of biological slime,system running1Years later,Appropriately add pesticides or antifreeze to the system piping,Vacuum degassing can also be performed with a vacuum degasser for large systems。


brass capillary tube(brass capillary tube)


3.ask:Will the capillary decorative layer crack??

answer:The temperature difference range of the surface layer where the capillary network is installed is generally in the range of20℃within,No surface cracking due to thermal expansion and contraction,Mainly to prevent empty drums。

(brass capillary tube)4.ask:How to fix or deal with capillary leaks?

answer:The capillary network ring stress is1.9MPa,Test temperature110℃Down,Keep8760Hours do not expire,No rupture、No leakage,And the capillary network is factory prefabricated,Each piece of net is passed through before leaving the factory25Kilogram pressure detection。

during construction,After the pipeline connection is completed, a pressure test should be carried out。Construction on plastering、Always maintain pressure during the hardcover process,If there is damage and leakage, it will be dealt with in time,Ensure safety during use。The capillary network is a thermoplastic material,Dry pipe leaking hot melt repair,Such as a single capillary leaking water,Cut it off and weld it,Does not affect system operation。

The capillary network is generally installed in combination with the decorative layer,Easy to find and repair leaks。Protection measures for finished products should be strengthened during construction,make reservations,try to avoid damage。


brass capillary tube


5.ask:What are the design essentials of capillary radiant air conditioners?

answer:Capillary radiant air conditioning system is a new type of energy-saving and comfortable air conditioning that can replace conventional central air conditioning。The system uses water as the refrigerant carrier,Radiant heating through a uniform and tight capillary network、refrigeration。Since the summer chilled source water supply temperature required by the system is only17~19℃Supply and return water temperature,only in winter32~30℃Supply and return water temperature,Lower than conventional water conditioning in summer7~12℃and winter45~40℃Energy consumption for water supply and return,Thus the system saves energy。

(brass capillary tube)Since the capillary radiant air conditioning system uses a uniform radiant surface for radiative heat transfer,Therefore, the system does not have the convective unevenness caused by conventional convective heat transfer.,Coupled with the fresh air replacement system configured for the capillary radiant air conditioning system, the system is more comfortable than conventional air conditioning。

1)Understanding the Building Envelope Load Metrics

(brass capillary tube)First, understand the importance of building structure to capillary radiant air conditioning systems。Since the temperature of the supply and return water at the radiant end of the capillary tube is only17~19℃,obvious,The capillary radiant end can only handle indoor sensible heat(Conventional air conditioning summer water supply and return7~12℃To deal with full indoor heat,Produce condensate and drain away),on the capillary wall contact surface16.8℃The dew point temperature will produce condensed water and affect the water and mildew of the ceiling area.(The temperature of the capillary water supply in summer rises to20℃above,Cooling Efficiency Decay Doubles)。

In capillary radiant air conditioning systems,The indoor latent heat is borne by the fresh air system(If the load index of the building envelope is greater than the energy-saving design standard,The air system also has to bear the sensible heat that the capillary can't handle)。therefore,The structure of the house is more thermally insulated and avoids cold bridges,The advantages of energy saving and the initial investment of capillary and supporting wind system are more obvious。

2)Configure the basic fresh air volume and supply air volume of the house

Fresh air volume and supply air volume are two relative concepts about capillary radiation air conditioning systems,The fresh air volume is generally defined in accordance with the normative standards,Can be defined by the number of air changes(Residential houses and public buildings have different ventilation times according to functional requirements),It can also be defined according to the per capita fresh air volume。

The air supply volume is the building load that needs to be borne by the wind system in addition to the cooling capacity that the capillary can provide.(higher load,The larger the air volume;In order to reduce wind noise, it is necessary to ensure an increase in the number of air outlets.),It can be seen that the load index of the building envelope is important to the design and initial investment of the capillary radiation air conditioning system。

(brass capillary tube)3)Determine how the capillary is laid

The laying method of the capillary is divided into the top surface、side wall、ground,The top surface is currently the most common laying method,Consider getting enough cooling capacity for the capillary,It is recommended to lay capillary cooling on side walls and floors(In winter, the comfort obtained by only opening the floor capillary is higher than the top heating)。

The laying method of the capillary tube on the top surface should be adjusted according to the ceiling surface and the lamp trough,Limited utilization。The capillary laying method is adjusted according to the owner's investment budget and comfort requirements。If the building envelope index of the house is high,The house consumes a lot of energy,And the owners are unwilling to increase the investment in laying capillary pipes on the ground。It can be suggested to implement by adding side wall laying capillaries。

4)Determine the fresh air treatment method

(brass capillary tube)In a project with high energy consumption of the house,If you want to achieve a new wind,Dehumidifier by Refrigeration+Full hot switch does not function,Rotary freezer dehumidifier required(But it will increase the size of the unit and the initial investment cost)。Therefore, we recommend the proportional fresh air treatment method.,Dehumidifier by Refrigeration+Full heat exchanger+Partial return air,Calculate the air handling status point and select the fresh air host。

5)Identify the source of outdoor refrigeration

(brass capillary tube)Because the chilled water temperature of the fresh air host is different from the capillary chilled water temperature,Therefore, when determining the source of freezing,either ground source、Water source or air-cooled host type,If the capillary is independent of the cold source,The selected host can choose a smaller host according to the correction factor of the chilled water temperature。However, if the capillary end and the wind system share the cooling source,to consider100%use capillary*Plate replacement correction factor+Choose the correct refrigeration source for the cooling capacity of the air system。


brass capillary tube


6.ask:What is the function of computer room automation?is it necessary?

answer:Capillary radiant air conditioning system is a more complex system than conventional air conditioning,Hand over to the owner for host operation,There will be condensation problems due to misoperation。

for example,If the capillary runs before the wind system,Break the original wind system protection,Prolonged operation can cause the dew point protection system to stop or the top surface water to become moldy。Therefore, proper computer room automation is necessary.。


brass capillary tube


7.ask:What is replacement air?what is the role?

answer:Downdraft indoors,The air exchange method of the upper exhaust air is called replacement fresh air。Its role is:Supply air temperature is lower than room temperature,Spreading along the ground to form a new air lake

Human body temperature is much higher than indoor temperature,Low-temperature fresh air floats up under the action of human body heating,wrap the body,Keep people in fresh air,And continue to float up to exhaust the outside through the exhaust port。This type of air flow is a plunger type unidirectional flow,Such as smoking and body odor will not affect each other,Various indoor environmental pollutants including formaldehyde are eliminated at the fastest speed。

The outdoor fresh air dehumidifier also adopts the replacement method for energy exchange,In summer, the outdoor high temperature fresh air exchanges cold energy with the indoor low temperature air.,In winter, the outdoor low temperature fresh air exchanges heat with the indoor high temperature air,can save the exhaust air65%energy above。


brass capillary tube(brass capillary tube)


8.ask:What are the technical requirements for capillary network construction?

answer:The end material of capillary network air conditioner is hot waterPPR,Connection method Hot melt connection,againstDe20×2.0the supervisor,In special cases, it can be supplemented by quick-connect pipe fittings under the condition of ensuring no water leakage。

When the average ambient temperature is lower than5℃Time,Considering the cold brittleness of the capillary network,If you do not cooperate with the relevant temperature protection measures,Construction should be stopped。

During capillary network construction,If laying on the wall or roof surface,The thickness of the general plastering leveling layer is0.5cm~1cm;If laid on the ground for ultra-thin floor heating,Insulation layer to be laid on the bottom layer,Both prevent reverse heat transfer and leveling,It is recommended to use foamed cement for the insulation layer,The general thickness is2~3cm,The thickness of the capillary network leveling layer is1cm,There is no need to lay a layer of bean stone concrete in the middle,The total occupied floor height is3~4cm。

9.ask:What kind of house is the capillary network system not suitable for??

answer:The capillary network system creates high quality、High comfortable air environment,not only the temperature,Also ensure a comfortable humidity,is a highly intelligent、integrated system。

In order to ensure the safety and reliability of the whole system,without high operating costs,Achieving an optimal operation management coefficient,From a design perspective,There are two types of buildings that are not suitable for capillary network air conditioning systems:

  • The thermal insulation performance of the building maintenance structure cannot meet the energy saving requirements65%Above the national energy-saving standards;
  • Chinese restaurant、Gym、The bathroom is crowded with people、high activity、Places with heavy water vapor evaporation。
(brass capillary tube)If the building with capillary network air conditioner contains a Chinese restaurant、functional areas of the gym,It can be solved by installing a fan coil unit。

10.ask:How safe and reliable is the capillary network air conditioner?

answer:The raw material for making the end of the capillary network air conditioner isPP-R、PE-RTand other thermoplastic green environmental protection materials,Hot melt formable,Also has high temperature resistance、High pressure、Corrosion-resistant features。The pressure capacity of the pipe is inversely proportional to the square of the diameter,Although the wall thickness of the capillary0.8mmbut able19kg pressure,The only thing with thin walls is to be afraid of needle sticks or scratches,So product protection is very important。

The end of the capillary network air conditioner has passed through8760Hrigorous testing,110℃water temperature19Kilogram Stress Test365the sky does not break、no leakage,This experiment shows that the capillary network can be used normally50more than a year。

11.ask:Why capillary network air conditioners save energy?How much energy is saved?

answer:The capillary network is an efficient heat sink,Whether and how much energy can be saved depends on the entire system。Efficient terminals provide the necessary conditions for the efficient use of low-grade energy in the system,The Ministry of Housing and Urban-Rural Development organized domestic authoritative experts to evaluate the scientific and technological achievements of the capillary heat pump air conditioning project,The conclusion is a system combining a capillary network with a heat pump or solar energy,Can save energy than traditional central air conditioning systems60~80%,The specific analysis is as follows:

1)with water/Ground source heat pump combination

After using capillary technique:

  • Heat pump condensing temperature decreases in winter,turn out to be45℃water supply down to30℃about,COPimprove,Energy saving index increased to50~70%;
  • Direct use of water by capillary network in summer/The ground source heat pump ground energy collector acts as a natural cooling source to remove the sensible heat in the air-conditioned room,The processing accounts for the total cooling load60~70%The energy saving of the sensible heat of the left and right reaches80%above,In addition, the capillary network air-conditioning technology is adopted,Attenuates the start-up cooling load that accounts for a large proportion of the conventional air conditioning system、peak cooling load,The reduction of the air supply volume of the air conditioner also reduces the energy consumption of the fan accordingly.50%above,Comprehensive summer energy saving index65~75%;

no matter the winter、summer,The capillary network mainly bears the indoor cooling and heating load in the form of radiation,Under the condition of ensuring the same comfort as the convection method,Indoor heating temperature can be lowered in winter2~3℃,Indoor air conditioner temperature can be increased in summer1~2℃,Building cooling and heating loads can be reduced5~10%。therefore,Combined application of ground source heat pump and capillary network,Annual energy saving target reached60%above。

2)Combination with solar energy

in places where solar energy is available,Using solar energy in winter10℃Low temperature hot water above,achieve30℃Time direct supply capillary network system for heating,lower than30℃Time,Continued heating by the heat pump host based on the temperature reached by the solar energy,make30℃Heating hot water,Greatly reduces heat pump energy consumption;

at the same time,Hot water storage tank can be used to store hot water for night use。Only in continuous rain and snow(no sunlight)case,Completely rely on ground source heat pump heating。heating in winter90%around can be determined by the energy saving rate95%around the solar system provides,leftover10%provided by heat pump,The winter energy saving rate is90~94%。

3)with industrial cooling water/waste hot water/Geothermal tailwater binding

If and industrial cooling water/waste hot water/Geothermal tail water for heat exchange,System water temperature reaches30℃Capillary network system can be directly supplied for heating,lower than30℃When the heat pump host can extract energy from wastewater30℃Heating hot water,The residual water after energy extraction can be reused。The energy saving effect is similar to that of solar power under heating conditions。

12.ask:Can the windows be opened after the capillary network air conditioner is installed??

(brass capillary tube)answer:The purpose of opening windows is to exchange indoor air with outdoor air,Thereby improving indoor air environment。Installing the air-conditioned room of the capillary network,System is generally equipped with replacement new wind,Outdoor air is treated with a new fan, becomes a dry clean new style,And by replacement,Always keep the indoor environment in a refreshing state,No need to open the window。

(brass capillary tube)If the window,Reverse pouring energy waste。In the case of a large humidity in outdoor,When the window is set, the dew point set by the room is protected by the temperature controller if it is checked.,Will automatically turn off the waterway,Prevent condensation,The temperature of the room will not meet the design comfort standard。

(brass capillary tube)13.ask:Install the wall of the capillary network if you want to hang a mural,What should I do with a nail??

answer:Construction of the capillary network is generally carried out in combination with decoration,In the construction process, according to the needs and design drawings of the owner,Pore hole、socket、Reserved wall position。

After the decoration,Wall surface should not be destroyed at will,To avoid damage to capillary。Later change,Apply thermal imaging technology,Determine the position of the capillary and then operate。


copyright:This article is a transcript of the related course writing in the heat pump business school。lecturer:Liang Zhong。Beijing Qiqi Huang Energy Technology Co., Ltd. General Manager,Design of water gland source heat pump system and composite energy system、Design and application of large air source heat pump system、Investment and operation of composite energy projects and air source heating projects。Representative project:Tianjin Tiens University City Ground Source Heat Pump Heating Source Heating System,Henan Luoyang Science and Technology Building Water Heat Pump System,Hebei Zhengding Administrative Center Compound Energy System,Hebei Green Time Community220Wanping rice air source heating system。