Functional Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 270

Table 11 Standard
dimensions of expansion
tanks

Lt Diameter (mm) Height (mm) Connection ( '' )

4 225 195 3/4

8 220 295 3/4

12 294 281 3/4

18 290 400 3/4

24 324 415 3/4

35 404 408 3/4

50 404 530 3/4

80 450 608 3/4

105 500 665 3/4

150 500 897 3/4

200 600 812 3/4

250 630 957 3/4

300 630 1,105 3/4

400 630 1,450 3/4

500 750 1,340 1

600 750 1,555 1

700 750 1,755 1

Fig. 15 Heat exchanger
scheme

to transmit the heat from one circuit to other (similarly with the electrical trans-
former). Mathematical model of the heat exchanger (Fig. 15 ) is the following:

Q

c p V p ð# p entry # p exit Þ ¼

¼ q p ð# p # s Þ ð Þ

k A 49

Q

V s ð# s entry # s exit Þ

¼ q s c s ð 50 Þ