Cremesso Coffee machine User Manual download pdf (Page 13)

Product Criteria Paper

The application of flow-type heaters is a current development towards super efficient

coffee machines. These types of coffee machines currently represent the best

available technology.

Table 2 shows the different properties of the three types of heating units in coffee

machines. Flow-type heaters have the lowest thermal capacity (due to their very small

thermal mass). The smaller the thermal capacity the less “heating up”-energy has to be

supplied. The flow-type heater shows a small non-insulated surface. The huge energy

saving potential compared to boilers and thermo-blocks is mainly due to the fact that it

is heated only for 1 to 2 minutes whenever a cup of coffee is produced. They do not

need autopower- down and have no ready mode losses, as they are activated only for

coffee brewing and switched off immediately when the coffee production is finished.

Heat losses during the brewing process are also low because of their little water

content. (Josephy, B. et al. 2011).

Table 2 Properties of heating units for coffee machines: material contents

and resulting thermal capacity at a temperature difference of 70°C (ambient 20°C,

coffee production 90°C) (Josephy, B. et al 2011).

Type Boiler Thermo-block Flow-type Heater

Water 200 g 10 g 10 g

Metal 400 g 650 g 120 g

Thermal capacity at

∆T = 70°C

22 Wh 12 Wh 3 Wh

 Availability of an Auto-Power-Down and Short Delay Time

An auto-power-down function is the first and simplest measure to shorten the duration

of the keeping hot state and thus to reduce the high energy consumption of the ready

mode (keeping hot of the water). However, the duration of the delay time, or in other

words, the time until the coffee machine switches from the ready mode into standby

mode is important: the shorter the delay time the greater the impact of this feature.

New water heater units that are designed as flow-type heaters do not need auto-

power-down, as they are activated only for coffee brewing and switched off

immediately when the coffee production is finished (see below).(Josephy, B. et al.

2011).

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

No comments

Cremesso Coffee machine User Manual Page 13