PHE Application 
    Food industry
    Refrigeration
    Renewable Energy
    Power
    Marine engineering
    Chemical Industry
    HVAC
    Solar
    General industry
    Other Applications
You are here :PHE Application > PHE Application
PHE Application
Solar

Maintaining the Temperature Stratification in the Tank

Hot water returning from the collector should enter the storage tank about one-third of the way down from the top. This may not be the hottest water collected during the day, because isolation and outside ambient temperatures vary during the day. This water will disturb the water at the very top of the storage tank. Water for use is taken from the very top of the tank, which is where the water is hottest. When hot water is drawn from the tank, it is replaced by new cold water, which should enter at the bottom. Water circulating to the solar collector should be drawn from the bottom of the tank on the grounds of efficiency. Always supply the collector with the coolest water available. The cooler a solar collector runs, the less heat it loses to the surrounding environment.

The Brazed Plate Heat Exchanger is designed for a solar panel with a maximum heat load of 600 W/m2. The statement 600 W/m2 is obtained from an average value of the solar radiation and the degree of effectiveness of the collector. Here the heat load of the collector is 1000 W/m2, with an assumed effectiveness of 0.6.

The most common heat exchanger for solar applications is the BL50C. Different types of BL50Cs are discussed in the tables relating to Figures 6.22 and 6.23. (Please note that BL50C*21/2P means a two-pass BL50C with 21 plates.) The principle of a two-pass Brazed Plate Heat Exchanger is shown in Figure 6.21. 

The tank has a volume of 1000 to 4000 liters, and the water it contains does not change, i.e. it is a closed circuit. There are different temperature layers in the tank, ranging from 15 degrees at the bottom to as high as 70 degrees in the top. It is therefore possible to choose a layer at the desired temperature from which to take the water. 


High Flow System (Circulation load: 30 l/m) 

Temperature program:
Ethylene glycol (40%)-Water 56 -> 36℃
Water 50 <- 30℃  

Type Heat Load Surface of the Collector Pressure Drop Primary/Secondary
  [kW] M2 [kPa]
BL50C*10 - 7.2 up to 12 5 / 5
BL50C*20 7.8-19.8 13-33 10 / 8
BL50C*30 20.4-34.2 34-57 13 / 10
BL50C*40 34.8-49.2 58 - 82 15 / 12
BL50C*50 .8-59.4 83 - 99 15 / 11


Low Flow System (Circulation load: 15 l/m)

Temperature program:
Ethylene glycol (40%)-Water 76 -> 36℃
Water 70 <- 30℃

Type

Heat Load

Surface of the Collector

Pressure Drop Primary/Secondary

 

[kW]

M2

[kPa]

BL50C*21/2P

- 18.0

up to 30

14 / 11

BL50C*33/2P

18.6-34.2

31-57

20 / 15

BL50C*41/2P

34.8-44.4

58 - 74

21 / 16

BL50C*65/2P

45.0-59.4

75 - 99

15 / 11


Tap Water System

Temperature program:
Water 60 -> 15℃
Water 52 <- 10℃

Type

Heat Load

Flow

Pressure Drop Primary/Secondary

 

[kW]

[l/min]

[kPa]

BL50C*33/2P

43

15

19 / 22

BL50C*41/2P

58

20

22 / 25

BL50C*65/2P

87

30

20 / 22

    Quickfinder
    Breaking news
2016.12.15
 2017-1-29 to 2017-2-1 Las Vegas
2015.06.09
 Baode developed New BPHE for R410A
2014.04.21
 Baode heat exchanger got successed in Beijing CRH show
    Upcoming trade fairs
2017-1-30~2017-2-1
 AHR Expo in Las Vegas 2017
2015-26-Jan to 2015-28-Jan
 AHR Expo in Chicago 2015
2014-3-18 to 2014-3-21
 Baode will attend the MCE show in Italy in March

copyright © Baode Heat Exchanger Co.,Ltd. 2017

关闭