Structural Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 182

Fig. 17 Daily hot water consumption

°

C between the hot and cold water
sides we can determine, based on the number of persons, the yearly quantity of heat
consumed for domestic hot water:

Assuming a temperature difference of 50

c w m

n N d

Q DHW ¼

600 D#

ð kWh Þ ð 39 Þ

3 ;

where:
Q DHW energy needed to produce hot water (kWh),

c w = 4.187 (kJ/kg ° C) speci c heat capacity of water,

m daily quantity of water consumption (kg/capita),

n number of building occupants,

N d number of days,

D# temperature difference

This hot water household consumption has a daily variation according to Fig. 17 .
The heat consumption for domestic hot water has an hourly variation; never-
theless, a daily/monthly average of consumption can be de

cation of
hot domestic water can be achieved by introducing thermal energy storage elements
that can satisfy the top demand. The monthly distribution of such consumption can
be considered as being constant.

ned. The uni

5.3 Analytically Estimation of the Power Consumption
for Domestic Facilities

European standard about energy requirements for lighting [ 15 ] was introduced to
establish conventions and procedures for the estimation of energy requirements of
lighting in buildings, and to give a methodology for a numeric indicator of energy
performance of buildings. It also provides guidance on the establishment of national
limits for lighting energy derived from reference schemes.
For new installations, the design will be to European standard [ 16 ] Light and
Lighting

— Lighting of work places — Part 1: Indoor work places, what speci es