Energy Systems

The compressor is often referred to as the heart of the refrigeration or heat pump system. It serves two main purposes. The first is to circulate the refrigerant fluid through the circuit like a pump, the other is to compress and raise the pressure and temperature of the refrigerant vapor so that it can easily be condensed back into a liquid to resume the heat transfer process.

In refrigeration systems the condenser is the heat exchanger where Hot, compressed refrigerant gas is condensed to a liquid and further cooled to recommence its journey around the circuit.

Convection Heater
Convection heaters provide quiet background warmth. The air adjacent to the heating element is warmed causing it to rise and creating natural warm air circulation in the room. Convection heaters are best suited to space heating.

This is a cooking device which may be installed (see cook top) but can be a free standing device including pans and woks with a feed from an LPG cylinder. These can be used in camping situations but are often used in kitchens. In such situations, cylinders should not exceed 4.5kg and should not be in a sealed or enclosed environment if installed in a building.

Countdown Timer
A countdown timer turns the heater off after a preset amount of time and is a useful economy measure for commercial rooms with limited occupancy such as cafeterias, motels and classrooms.

Heat Exchanger
A device that transfers heat from one medium to another via a physical conductive material without a mixing of the mediums, such as air to water, water to water, water to air and air to air.

Heat Settings
Heat settings allow the thermostat to be adjusted to the desired level of comfort.

Mobile/Portable Heater
This is a mobile gas fired heater which is designed for mobility and in many cases will be on wheels. These are usually run on LPG but may be run on compressed natural gas from a cylinder inside of the heater. Some heaters may be capable of running from a bayonet style fitting from line gas. There should always be sufficient ventilation when using these heaters. It is recommended that, where possible, windows be kept open.

Patio Heater
A gas heater used to heat an outdoor or semi enclosed area. These are free standing devices and usually have a cutout switch for protection if knocked over. Typically these are run on LPG cylinders however they may be run from natural gas if properly fitted by a Craftsman Gasfitter subject to the manufacturers' instructions. These should not be used inside, or in a fully enclosed area without good ventilation.

Radiant Heater
Radiant heaters provide quiet directional heat. The heating element emits infrared heat that travels through the air to heat objects directly. Radiant heaters are best suited to spot heating objects in open or enclosed spaces.

The combined processes of emission, transmission, and absorption of energy traveling as electromagnetic waves.

The heat transfer fluid contained in a heat pump refrigeration circuit. Normally this is a chemical contained in a hermetically sealed circuit that has a low temperature boiling point; refrigerants can be one of a number of man made Fluorocarbons or a Hydrocarbon compound (refined Propane or Isobutane).

Visible gaseous product of incomplete combustion. Smoke varies with its source, but it usually comprises hot gas and suspended particles of carbon and tarry substances, or soot. Proper firing techniques and equipment can eliminate or greatly reduce the smoke produced by any fuel. Wood gives little smoke if burned when dry and if the fire is given a good supply of air.

Test Gases
This is a description used in Standards and Regulations to describe a gas mixture that is required to be tested before being deemed legal to sell in New Zealand. New Zealand test gases are different to those in other countries due to the nature of the gas presently delivered by gas retailers. Test Gases are described in Standards documents and can be mimicked by test laboratories within or outside of New Zealand. All gas appliances must be capable of burning New Zealand gases so this must be demonstrated. If a gas appliance burns Propane or Butane only, this must be made particularly clear to the buyer.

A thermostat maintains the room at an even temperature and conserves energy by operating the heater only when needed.

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