What is Heat / Cool Recovery?

If you ask a person in the HVAC business what heat or cool recovery means you will get a range of answers. It could be:

  • Using a 3 pipe VRF system.
  • Using waste condenser heat to heat or pre heat process hot water.
  • Using waste fan coil heat to reheat conditioned air to avoid cold spots in supermarkets.
  • Using exhaust conditioned air to pre cool and dehumidify fresh air coming into the system.

Heat or Cool Recovery and Energy Efficiency

As electricity prices increase Heat and Cool Recovery is becoming an important way to increase total building efficiency and reduce energy costs.

Key Points

  • Even though the modern air conditioning system is a pretty efficient way of moving heat from one place to another there are still substantial efficiencies to be gained by use of a range of Heat / Cool Recovery strategies.
  • We have historically treated each heat transfer process in a building as separate systems.
  • This means that we dump most of the “waste” heat from a cooling process” “out the window” into the atmosphere. In many buildings the amount of available “waste heat” large.
  • In many buildings with high outside air requirements we also dump a lot of “waste cool” “out the window”
  • Heat / Cool Recovery systems allow us to channel “waste heat or cool” from one process to provide all or part of the heat / cool requirements for another process.
  • Recovered Heat / Cool is not entirely free but it is much cheaper than “new heat or new cool” from a separate system.

The benefits of heat / cool recovery are huge:

  1. Lower Running Costs
  2. Lower initial equipment costs
  3. Reduced Carbon footprint for the system.

Temperzone is interested to get an industry perspective on Heat / Cool Recovery. Complete the questionnaire below and you could win an iPad 4.

Q1. What does Heat / Cool recovery mean to you? Check all relevant boxes:

Q2. In your business have you ever specified, installed or used. Check all relevant boxes:

Q3. Would you consider using Heat / Cool Recovery to improve building energy efficiency in the future.:

Q4. What types of heat recovery do you prefer? Check all relevant boxes:

Conditions: The iPad competition is open to anyone working in the HVAC industry in Australia and NZ. The competition is not open to Temperzone staff or their families. The winner will be chosen from the answers to Question 4. The judge’s decision is final and no correspondence will be entered into. The winner will be advised by phone or email. The winner will also be announced in a future edition of Temperzone News.


Articles this Issue

2013 started with a record-breaking heat wave that has lasted almost three weeks across many parts of Australia. Temperatures regularly went above 48°C, with the highest recorded maximum of 49.6°C at Moomba in South Australia on January 12.

Albany Senior High School in North Harbour, Auckland is very modern, cutting edge, open design which presented significant air conditioning challenges. A total cooling duty of 1100 kW was required. Temperzone supplied a total of nine multi compressor custom built special roof top packaged units.

Heat Recovery means different things to different people.

Answer our questionnaire and you have a chnace to win an iPad 4.

Hitachi VRF has a significant UNIQUE advantage in buildings where AS1677 compliance is critical. Lower system refigerant charge makes Hitachi VRF cheaper and more flexible than the major opposition!

On Friday 7th December, the Melbourne office organised a retirement celebration for Ken Dalgleish. The function was attended by many of Ken’s customers, past and present employees as well as Alan Channells, David Staker.

Maintaining exact conditions within these rooms is often critical to the smooth running of the entire operation. Recently, we have seen an increase in the use of the ISU series of Under Ceiling Units serving electrical switch rooms.