Category: Technical information associated with Rycroft sizing of
Rycroft HT Breeze Sizing of Rycroft HT Buffer Vessel Selection of
Rycroft HT Breeze Selection of Rycroft HT Buffer Vessel
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Rycroft Ltd
Sizing / Selection of Rycroft HT Breeze & Buffer
Vessel
TABLE 1 To size the HT Breeze use the following demand factors:
TABLE 2
Example
Using the above table for a 173 bed hospital ward with showers, hand
basins and sinks.
42 Single Person Showers = 42 x 70 = 2940
55 Private Hand Basins = 55 x 10 = 550
9 Public Hand Basins = 9 x 15 = 135
3 Slop Sinks = 3 x 50 = 150
15 Baths = 15 x 60 = 900
Total Volume = 4675
Load Factor from above table = 0.7
TOTAL DEMAND RATE = 4675 x 0.7 = 3273 litres/hr
The HT Breeze & Buffer Vessel Combination should be sized as
follows:
The buffer vessel capacity should be 25% of the hourly demand.
Therefore the required storage capacity = 3273 x 0.25 = 818 litres.
The nearest standard buffer vessels sizes are 800 and 900 litres.
It is recommended to go up in sizes, therefore use a 900 litre buffer.
The HT Breeze can be selected as follows:
The continuous hourly demand = 3273 litre.
Kw = flow (l/s) x specific heat of water x temp difference (°C)
Therefore the required kW rating
= 3273 x 4.187 x (60-10) 3600 = 190.3 kW
Using the sizing table 2.
The nearest standard HT Breeze = CP-B100 rated at 209 kW.
The sizes shown in the sizing table represent the standard range of HT
Breeze units. These are available with both single head and dual head
primary pumps.
The following pages describe the full range of models available.
Standard Buffer Vessels are available in the following sizes:
440 ltr 800 ltr 1200 ltr 1800 ltr
550 ltr 900 ltr 1350 ltr 2000 ltr
700 ltr 1000 ltr 1500 ltr 2300 ltr
For larger capacities please refer to the Storage Calorifier Catalogue.
A HT Breeze and buffer vessel is used when water demand is not constant
but high flow rates occur frequently. Storing hot water in the buffer
vessel for peak demands reduces boiler power.
When enquiring please specify the required working or design pressure of
the system to enable Rycroft to optimise the copper cylinder thickness
to suit your requirements. Both Vented and Unvented packages are
available. Please contact our technical department for further
assistance.
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