Sizing / Selection of Rycroft HT Breeze & Buffer Vessel

Rycroft
Sizing / Selection of Rycroft HT Breeze & Buffer Vessel
 

TABLE 1 To size the HT Breeze use the following demand factors:

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TABLE 2

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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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Rycroft Ltd
Duncombe Rd
Bradford
West Yorkshire
BD8 9TB

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