Economic Advantages

Comparison of heat losses of pre-insulated pipelines with reference to the SYNCOPEX system

As shown in the previous practice, in design of central heating and hot water transmission networks it is assumed that diameters of pipelines should be selected taking into account the demand for thermal energy and hot water, as well as, flow resistance, without analyzing the important operational factor that is the thermal efficiency of pipelines.

In view of aconstant increase in prices of thermal energy and hot water production, the basic function limiting expensesof users should be the design of economical transmission networks with the lowest heat losses on transmissionavoiding excessive energy transfer into the ground in which pipelinesare located.

Considering the above-mentioned circumstances, SYNCO has developed and produced for several years a combined pipelinessystem comprising four transmission pipes in one heat-insulating casing,creating eight assortments, starting from a set of 2×75+50+32/293 m/m to 2×25+20+16/160 m/m.

Each assortment brings significant energy transfer savings which are presented in the tables in the pipeline working assumptions:

Central heating network – supply  70 ºC, return 40 ºC

Hot service water network – supply 60 ºC, circulation 40 ºC

 

 

Table No. 1

Comparison of heat losses of 4 independent pre-insulated pipelines to the “SYNCOPEX” pipeline construction with four pipes in one casing.

 

ECONOMIC ADVANTAGES NO. 1

Diameter of exemplary single pipes in pre-insulationTotal heat loss
of single pipes
Total heat loss
of quadruple pipes
Reduction of heat loss
on transmission
lp.
12525201632,114,655%
23232252035,214,758%
34040322040,816,660%
45050322043,019,355%
55050402545,219,457%
65050503247,519,559%
76363402548,619,660%
87575503252,422,5457%

 

 

Table No. 2

Comparison of heat losses of two independent pre-insulated pipelines with two transmission pipes for the construction of “SYNCOPEX” pipelines with four pipes in one casing.

 

lp.Diameter of exemplary single pipes in pre-insulationTotal heat loss of single pipesTotal heat loss of quadruple pipesReduction of heat loss on transmission
1(2x32) (25+20)29,414,750%
2(2x40) (32+25)28,816,642%
3(2x50) (32+20)32,819,342%
4(2x50) (40+25)32,819,441%
5(2x50) (50+32)33,719,541%
6(2x63) (40+25)33,419,642%
7(2x75) (50+32)36,7421,56

 

  1. Due to the fact that other companies that areproducing pre-insulated pipelines present heat losses in scope of single pipes and two working pipes in one casing only in a form of diagrams from which similar data to SYNCOPEX results, the tables contain the values of single and double pipes corresponding to SYNCOPEX system.
  2. The heat values included in the tables in the scope of four pipes in one casing are technical values that are certain from research and findings made by the Institute of Physics of the Building Research Institute in Warsawand refer to the „SYNCOPEX system.

 

From given values of heat losses of single and double pipelines for both SYNCOPEX pipelines and other similar products, compared to a system with four conduit pipes in one SYNCOPEX system casing, there is a clear economic effect on energy transmission for the network user and, therefore, we believe that pipelines with fours working pipes in one housing should find wide application in technical projects.

Reduction of expenses of investment works as a result of using the SYNCOPEX multipipe system

As a result of the design and use of complex „SYNCOPEX” pre-insulated pipelines, apart from obvious operating expenses savings due to reduction of heat losses on transmission, the investor obtains a serious effect in reducing costs by 50% to 75% in the following positions:

  • earthworks related to excavation and backfilling of the excavation,
  • making subtrate and sand covering,
  • export of excess soil,
  • restoration of paved surfaces and lawns,
  • assembly of expensive manifolds and longitudinal insulation sets
  • assembly of protective wall passages
  • assembly of caps at ends of pipelines

 

 

The efficiency of transmission  of heating medium and hot service water, as well as, low costs of works prefer the multipipe SYNCOPEX system, while allowing design units to develop technical solutions that meet the investors’ expectations.   

 

An exemplary economic effect as a result of network operation

 

The comparative heat loss yield is 30,8 W/m.

To calculate the yield of annual heat losses and the effects of one heating season, the principle was assumed that the central heating is active for 7 months and hot water for 12 months. Hence, for the calculation of the annual yield of 1mb of the network, an average exploitation period was assumed  for 8 months.

 

 

30.8 KW / m x 24 hours x 31 days x 8 months = 183.3 KW / m

 

 

Cost of 1kW of energy is  0,379 PLN with fuel oil cost 3,65 PLN/litre

Saving cost of buying fuel oil per 1 meter of combined pipeline during a heating season average:

 

 

183,3 KW x 0,379 PLN = 69,47 PLN / 1 mb

 

 

With a 100 mb network, the economic effect during one heating season is:

 

 

69.47 x 100 mb = PLN 6.947

 

 

The value of savings is expressed by a reduced purchase of heating oil in the amount of about 1903 litres.