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Hot Products

Dongguan ARCIO heat energy equipment co.,LTD

Add: Building D,No7 Julong Road, Shigu Village,TangXia Town,DongGuan City,GuangDong Province,China
Hotline:4000978188
TEL:0769-82861878

Location:HomeService

Purchasing knowledge

The gas wall mounted boiler should take its own conditions into account when it comes to model selection.A reasonable selection should be based on the heating area of the user’s bedroom area and also the conditions of water, electricity, gas and region, etc so that the boiler can meet the comfort requirements while ensuring that the hot water provided can meet the people’s need in their daily lives and bathing. The following should be taken into consideration:

Firstly, the selection criteria of gas wall mounted boiler

1.Output power of the boiler

The heating load of the boiler can not exceed the rated output power listed in the given table, and an extra 10 percent of safety margin should be added.The production of domestic hot water will change with the changes in water temperature.See the table below which demonstrates the production capacity of hot water.The flow rate of domestic hot water cannot be lower than 2.5 l / min.

Model

Unit

JLG18

JLG20

JLG24

JLG28

Maximum power output

(KW)

16.2

18

21.6

25.2

Rated power output

(KW)

16.2

18

21.6

25.2

Rated production capacity of hot water (△t=25K)

(L/min)

9

10

12

14

2. Types of gas, pressure and air consumpxion

Make sure that the user’s air demand must not be less than the maximum gas consumpxion in the following table, otherwise it will affect the boiler’s capacity of supplying heat and domestic hot water .

The following table is the gas consumpxion per hour for your reference.

Model

Gas heat load(kw)

12T gas(2000Pa)

20Yliquefied gas (2800Pa)

6R manufactured coal gas(1000Pa)

Minimum air
consumpxion
(m3/h)

Maximal air
consumpxion
(m3/h)

Minimum air consumpxion (m3/h)

Maximal air consumpxion (m3/h)

Minimum air consumpxion (m3/h)

Maximal air consumpxion (m3/h)

JLG18

18

0.54

1.8

0.2

0.64

1.16

3.87

JLG20

20

0.6

2.0

0.22

0.72

1.29

4.3

JLG24

24

0.72

2.4

0.25

0.82

1.55

5.17

JLG28

28

0.84

2.8

0.33

1.0

1.8

6

3. Gas meter The following table is some information about gas meter for your reference. It can help to test whether the flow value of the user’s gas meter is enough or not. The flow value should not be less than the rated flow value in the table below. The low resistance meter must be used when you choose to use, manufactured gas, and the flow value of the user’s gas meter is often smaller than the normal one. Besides, the following table is the gas meter specially for the gas wall mounted boiler. If the user also uses other gas appliances that use the same kind of gas, then the gas meter must be rechecked, and the total air consumpxion must not exceed the maximum flow value of the selected gas meter.

Model

Gas heat load (kw)

12Tgas (2000Pa)

20Y liquefied gas (2800Pa)

6Rmanufactured gas (1000Pa)

Rated flow value (m3/h)

Maximal flow value (m3/h)

Rated flow value (m3/h)

Maximal flow value (m3/h)

Rated flow value (m3/h)

Maximal flow value (m3/h)

JLG18

18

2.5

4.0

1.6

2.5

4.0

6.0

JLG20

20

2.5

4.0

1.6

2.5

4.0

6.0

JLG24

24

2.5

4.0

1.6

2.5

4.0

6.0

JLG28

28

2.5

4.0

1.6

2.5

6.0

10.0

4. The flow and head of the circulating pump
As there is an one-to-one relationship between flow and head in the performance curve of the pump(see the below pump performance curve, up is Grundfos, down is Wilo), the accumulation of the water resistance value of radiator,valves,pipes and wall mounted boiler in the most unfavorable pipelines of the heating systems and plus the amount of about 10% of the safety margin, then we get the value of the pump head H which finds its corresponding flow value in the pump performance curve. As long as Q is lower than the rated heating water flow (△ t = 25K), it can meet the requirements. The water resistance of the wall mounted boiler must be lower than 1mH2O.

If the resistance of the pipeline exceed the value of the pump head in the table below, then the pump operating point will shift to the left along the pump performance curve, which will reduce the water flow value. The heat load, cooling equipment and room temperature of the heating system may not meet the design requirements.

5.Water and electricity equipment: Parameters of water and electricity can not be lower than the value or standard in the following table.

Model

JLG18

JLG20

JLG24

JLG28

Power used

AC220/50Hz

AC220/50Hz

AC220/50Hz

AC220/50Hz

Rated input power

(W)

110

110

110

140

Applicable range of water pressure

(bar)

0.38

0.38

0.38

0.38

Minimum flow of domestic hot water

(L/min)

2.5

3.5

3.5

4

The water pressure range of heating

(bar)

0.83

0.83

0.83

0.83

A) The interface size of pipe and trachea : The interface of water pipe and trachea used tcannot be smaller than the value in the following table. If the diameter decreases, the crosssectional area of the pipe becomes smaller, which greatly speeds up the water flow rate of pipeline. Due to the 2 times square relationship between water resistance and water flow (h=. Q2), so the water resistance of pipeline will increase exponentially, which might lead to the reduced water flow in the heating system, seriously influencing the heating effect.

If the gas pipe becomes smaller, the resistance will also increase exponentially, which may make the gas pressure lower than the rated pressure. Therefore, the diameter is not allowed to be reduced, especially for coal gas users.

Model

JLG18/20/24/28

Diameter of heating pipe

(inch)

G3/4

Diameter of hot water pipe

(inch)

G1/2

Diameter of gas pipe

(inch)

G3/4

6 Heating calculation

6.1 Heat load

The heat load in winter heating system should be determined according to the heat lost and obtained of the building. For civil buildings, because of the less heat obtained in the winter indoor, so the latter can be omitted and be considered as the safety margin, only calculating all the heat loss of the heating room. The main parts are as follows:

1 The heat consumpxion of the envelope structure, including walls, doors ,windows, roof and floor .;

1.1 The heat consumpxion of heating the cold air penetrating through the gap of the door and window ;

1.2 Heat loss by any other means

The accumulation of heat consumpxion in all the above rooms is the heat load of the heating room

6.2 Indexes of heat load

Because calculating the heat load is complex and cumbersome, and sometimes it is difficult to get the data of building’s heat load, the estimate index method is usually used to determine the heat load of all heat users. The commonly used methods employed are often the volume or area heat index method.

A. volume heat index method: The heat load of the buildings heating design can be estimated as follows:
Qnqv×V× (tntw) (W)
Qn—— heat load of the buildings heating designW
V——peripheral area of the building,m3
tn——indoor temperature,℃;
tw——outdoor temperature,℃;
qv——the heating volume heat index of buildingsW/m3·℃,representing the hot load of 1 m3 peripheral area of the building when the temperature difference between indoor and outdoor is 1 ,rbuilding outer volume. The figure of qv is mainly relevant to the building’s envelope and shape. The greater heat transfer coefficient of building envelope, the higher the lighting rate and the smaller external building volume, the greater the QV value will be.

B.Area heat index method: the heating load of the building can be estimated through the following fomula:
Qnqf×F (W),
Qn—— heat load of the buildings heating designW
F——covered area of the building,m2
Qf--The heating area heat index of the building W/m2, representing the heat load of each 1 m2 building area.
Note: The heat load of the building mainly depends on the vertical wall structure (walls, doors and windows) to transfer heat outward. It is relevant to the plane size and height of the building. Therefore, it does not depend directly on the plane area. The heating volume heat index is a clear physical concepx to measure the heat load of building, but is not as easy as the heating area heat index method which can be used when it comes to the general civilian residential houses whose floor’s height is below 3 meters.

6.3Heating area

The data in the table below is for your reference. The determination of the heating area must be based on the actual situation of region, insulation conditions of buildings and the users’ requirements

Mode;l

JLG18

JLG20

JLG24

JLG28

Heating area

(㎡)

100

120

150

180

A)Temperature of the indoor design

It is generally provided by the residential building design introduction or required by the customers. The indoor design temperature for civil construction should be 16 ~ 20 . If no requirement is made, then the general civilian houses can set their room temperatures according to the HVAC regulation:

Temperature of the heating room

Bedroom

Living room, dining room

Study

Bathroom

Room design temperature()

18

18

18

25

B) Radiator

C.1, water temperature requirements in and out of the radiator

In China’s central heating, the water temperature supplied or returned is often 95/70, while wall mounted boilers belong to the low temperature heating system. due to low temperature,. Due to its low temperature, low temperature difference and good heat dissipation effect, it is commonly used in Europe, but will incur high cost. For the sake of economy and comfort, the Comanche wall mounted boiler and the radiator heating system should adopx water temperature of 75/50. In addition, heating and water system of central air conditioner can use lower water temperature, generally 40 ~ 60 . Consequently, in the selection of the radiator, the highest water temperature should not exceed 80 . 75/50 is appropriate for safety’s sake, otherwise it will greatly reduce the heat dissipation potential..

c.2The water capacity of radiator

The bigger water capacity of radiator will prolong the time spared by the rise in water temperature, resulting in the slow-down of the rise in room temperature and the intensity in corrosion and fouling of radiator. In general, plate and aluminum alloy has relatively smaller water capacity, iron and steel pipe type radiator have larger water capacity.

C.3 in addition, the brand, type, material, working pressure, color, anti-corrosion performance and so on should also be taken into account.