Category: Heating & Cooling Design

Example of an Galletti ART-U fan coil convector, which provides hydronic heating and effective cooling with chilled water below they dew point.

Heat pump hydronic cooling

The Galletti ART-U can coil convector provides hydronic cooling and heating with a heat pump. The ART-U convector is designed for cooling in summer using chilled water from a reverse cycle heat pump. An internal fan draws air through its coils. Condensation is drained away outside, which gives you latent cooling as well as sensible temperature cooling. In winter, hot water from the heat pump is circulated through the convector.

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Hydrosol image showing a timber covered slab absorbing sunshine radiation in winter, which will improve house heat loss.

Improve house heat loss

This BLOG discusses the causes and suggests steps to improve your house heat loss in winter and heat gain in summer. The causes come broadly from 3 areas, about one third each: (1) ceilings, (2) windows and (3) walls, floors and general air leaks. Your choices on what do depend firstly on whether you are building a new house, renovating an existing house or improving the thermal performance of an existing house.

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Heating and Cooling Systems Adding Value to your Home

Heating and Cooling Systems add Value to your Home

This BLOG discusses all-electric heating and cooling systems adding value to your home. It discusses mandatory energy ratings that have been in force in the UK and Europe for more than a decade, slowly catching on in Australia starting with the ACT. The justification for all-electric heating and cooling includes: a) lower running costs with solar power, b) adding value to your home and c) reducing Greenhouse emissions.

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Hydrosol image of a Victorian house in Castlemaine, Central Victoria, Australia transformed into an energy efficient, all-electric home using heat pumps with Passive Design principles.

Castlemaine All-Electric House Renovation

This Victorian house in Castlemaine was transformed into a comfortable, low energy home. It features all-electric heat pump hydronic heating/cooling, heat recovery ventilation and heat pump hot water. The new home married its Victorian past to a modern extension using passive home principles.

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Schematic showing the where air leaks from convection, which needs to be sealed to improve house heat loss.

Factors Affecting HVAC Design

Heating, Ventilation and Cooling (HVAC) Design starts with thinking through your needs. Good building design has low heating and cooling requirements. This enables all-electric solutions with energy efficient appliances such as inverter heat pumps and air conditioners. These appliances can be largely powered by solar panels. The thermal energy can be stored in the mass inside your home during the day and released at night.

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Image of Minitec underfloor heating coils laid over suspended floor

Underfloor heating and cooling suspended floors

You can enjoy underfloor heating and cooling if you are renovating or building with suspended floors. Use a heat pump as the heat source to have reverse cycle cooling in summer as well. This will absorb heat from your home and expel it outside in reverse cycle mode. You can apply most types of floor coverings over your underfloor heating circuits including tiles timber boards and loose weave carpet.

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Hydrosol image of Stiebel Eltron buffer tanks, larger tanks can be used as a thermal battery.

Heat pump thermal battery

Consider adding a larger heat pump buffer tank or thermal battery to increase the internal mass of your home for greater thermal storage. This will help moderate the extremes of your indoor temperatures, reduce your power consumption for heating and cooling and maximise your solar power during the day.

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Image of Australia's climate zone map

Cool Temperate Zone Heating

A cool temperate climate zone such as Victoria is well suited to hydronic heat pumps. This is an efficient and effective way of heating and cooling if your home is well insulated. It will give you low operating costs and can be largely powered by your solar panels. Cool Temperate zones have: low humidity,
high diurnal range (temperature swings), cold to very cold winters and hot dry summers.

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linear air conditioning registers

Best Air Conditioning Systems

Choose the best air conditioning system for your home. Options are: Split, Multi Split, Variable Refrigerant Flow (VRF), Energy Recovery or Ducted systems. All can be WIFI connected to operate on your electronic devices.

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Hydrosol image of underfloor hydronic circuits laid prior to the concrete screed layer with heat pump for heating and reverse cycle cooling.

Heat Pump Hydronic Heating

Heat pumps use water to transfer heat to your home in winter from the outside air and reverse this process in summer to keep your home cool. Water is 3300 times more capable of transferring heat than air so you don’t need large air ducts with heat pumps.

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