AS 4234-1994 pdf free.Solar water heaters – Domestic and heat pump – Calculation of energy consumption.
AS 4234 sets out a method of determining the annual performance of domestic solar and heat pump water heaters using a combination of test results for component performance and a mathematical model to determine an annual load cycle task performance. The procedure is applicable to solar water heaters with integral boosting or prehealing into a conventional water heater and to heat pump water heaters. Solar and heat pump water heater types not covered in the application of this Standard can be tested under AS 2984 or AS 2813 to obtain an annual performance assessment.
1.2 APPLICATION
The procedure in this Standard uses a mathematical model to assess annual task performance hence the application of the procedure is restricted by the availability of suitable mathematical models. The analysis required by this Standard shall be based on the TRNSYS simulation model (version 1 3. 1 or later) with modifications to suit typical Australian solar and heat pump water heating products. The software required is included in this Standard together with weather data and typical system description flies. The operating conditions to he used for evaluating the performance of a water heater are not defined in this Standard: however a set of typical weather and load conditions are specified in Appendix A.
1.4 DEFINITIONS For the purpose of this Standard, the definitions below apply.
1.4.1 Absorber—device within a collector for absorbing radiant energy and transferring this energy as heat into a fluid.
1.4.2 AngIe of incidence—angle between the direct radiation and the outward normal from the plane considered (e.g. from the collector aperture).
1.4.3 Angle of inclination —angle between the absorbing surface of the collector and the horizontal.
1.4.4 Close-coupled solar water heater—unit where the collector abuts the container on a common chassis or cradle.
1.4.5 Collector—device containing an absorber.
1.4.6 Collector aperture—net area measured parallel to the plane of the collector available to admit, reflect or refract solar radiation to the absorber. The aperture width for different collector types is illustrated in AS 2535.
1.4.7 Container—vessel (including flttings) in which the heated water is stored; sometimes referred to as a storage container, cylinder or tank.
1.4.8 Electricity tariffs
1.4.8.1 Continuous tariff—tariff br continuously available electricity supply.AS 4234 pdf download.