York Ylca 12, Installation Manual

Page: 9 / 56

YLHA PLUS SELECTION EXAMPLE
A YLHA PLUS 5 heat pump operating at a 35 °C ambient temperature should cool water from 13 °C to
7 °C, with a 5 kW cooling capacity.
A 4 kW heating capacity is required in 0 °C design ambient temperature and a hot water outlet temper‐
ature of 45 °C.
The fouling factor is 0,044 m
2
°C/kW, with the unit operating at sea level (no corrections). From a quick
glance at the tables
Heating capacities YLHA 5 ÷ 27 , see on page 27 and Cooling capacities YLCA 5
÷ 27 , see on page 28 we see that a YLHA PLUS 5 heat pump approximately gives the required ca‐
pacities:
• Cooling capacity = 5,4 kW
• Total unit absorbed power = 1,91 kW
• Cold water temperature = 13 °C to 7 °C (Temp. diff. of 6 °C)
• Hot and cold water flow rate = 774 l/h
• Heating capacity = 4,15 kW
• Total unit absorbed power in heat mode = 1,88 kW
• Hot water outlet temperature = 45 °C
Hot water temp. dif‐
ferential
=
4,15 x 860
= 4,60 °C
774
Thus, hot water return temperature is = 40,4 °C
All values are within operating limits:
• Available pressure in hydraulic circuit of a unit with pack:
• From Table
Pressure available for the hydraulic circuit and pressure drop in the hydraulic circuit (with‐
out filter mounted) , see on page 13 we infer that the YLHA PLUS 5 MC, with a flow rate of 748 l/h,
has an available pressure of 56,5 kPa.
• Pressure drop in filter.
– From Table Pressure drop in filters , see on page 14, 1" filter, we infer that with a 748 l/h flow
rate, said filter has a pressure drop of 1,2 kPa.
1 Installation manual
1.4 Selection guide (YLCA/YLHA)
6