Rob Fiander
Chief Engineer
Oasis wing 30 rooms + 1 Kitchen + toilet facilities
2010 Oasis Hot water Project
Installed • 96Kw Resistive heating • 2000lt 30 years old tank
• Supplies 30 rooms + 2 Kitchens + Guest toilets
Required
Lower cost water heating
Suitable capacity for 80% “same time draw”
Future solar integration
Installed in 48 hours
Old tank installed in 1960
Which heat pump manufacturer do I use???
Mitsubishi
Daikin
Quantum
Steibel Eltron
Techniheat
Danfoss
Sirac
IST
Who is registered with Eskom ? (see web site)
Integrated system ?
Cost? Australian Standard DR AS/NZS 5125.
Heat Pumps are tested in Australia at the University of Sydney by Professor Graham Morrison as part of the requirement and evaluation of product performance in order to be eligible to participate in the Australian renewable energy rebate schemes.... ...To be eligible to be part of the Australian program every system must meet AS/NZ manufacturing standards, and then each product has to be submitted to the University of New South Wales where Professor Graham Morrison (who is a World renowned renewable energy authority & author) carries out simulated tests to determine operating efficiencies (COP) for every product...
Q
h


m
j
c(t
f , j
 ti, j )
where c is the specific heat of water, and
c=4.187 kJ/(kgoC), ti,j is the temperature of
the cold water in volume section j of the tank,
the initial temperature, tf.j is the final
temperature of hot water in volume section j,
and mj is the mass of the hot water mass
corresponding to the temperature tf,j.
Engineering design tips
 Remember the heat recovery time is about 4 x slower than resistive heating.
Install additional storage capacity to overcome this
For International hospitality standards “think legionnaires” and the ability to sanitise the water at 80C
Insulate pipe work Insist on a 5 year guarantee on the compressor and a offer a fair and reasonable S.L.A Stay away from R22 refrigerant (to be phased out from 1st Jan 2013)
500
4 month monitoring
period 450
400
350
300
KWH’s
250
200
150
100
50
0
1
5
9
13
17
21
25
29
33
37
41
45
49
53
57
61
65
69
73
77
81
85
89
93
97 101 105 109 113 117 121 125
Red line KVA
Savings R15,000 per month
R.O.I 13 months* * Integrated heat pumps supply
and install + Rebate Installed heat pump to assist
Hot water draw in our laundry Each machine rated at 36KW