Page 226 - Boiler plant and distribution system optimization manual

Boiler Plant Calculations 211

Table 11-19

HEAT LOSSES IN THE City Water 50F 18 Btu/lb
CONDENSATE RETURN SYSTEM Hot condensate 194 F 162 Btu/lb
Water heating (50F to 194F) 144 Btu/lb
The purpose of this section is to illustrate Fuel energy used to heat city
how energy is lost in the condensate recovery sys- water to 194 F with 80%
tem serving a 100 psig steam system. efficient boiler 180 Btu/lb

Example 1. Assuming that condensate should re- Water heating (194F-338F) 144 Btu/lb
turn to the receiver at 194F, what losses are in-
volved for each pound of cold make-up water Fuel energy used to bring water
used to replace steam and condensate lost from to saturation 338F with boiler 180 Btu/lb
the system?
Latent Heat of 100 psig steam 880 Btu/lb