Mear's Calculators GAS SAFE REGISTER TM

MEAR'S CALCULATORS

Construction of the highest quality, precision made from non-warping white and clear acrylic, with main dials 3 mm thick and subsidiary dials 1.5 mm thick.
All scales and lettering are clearly and sharply engraved, not printed, and are coloured to facilitate use.


FIRST PRINCIPLES DOMESTIC HEATING CALCULATOR

For complete installation design.
An instrument, simple and quick to use, which determines the heating requirements for all types of houses and small commercial properties (i.e. shops and small warehouses). Each section is engraved and colour filled, complete with wallet and instruction booklet.
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HEATING CALCULATOR

For Energy Efficient Houses & Bungalows. Metric only.
This calculator gives the heat requirements of new homes built to meet the improved standards of insulation laid down in the 1990 Building Regulations (i.e. wall and floors, U = 0.45 W/m ² K, and roofs, U = 0.25 W/m ² K). It also uses lower air change rates associated with the improved draughtproofing of modern housing. The reverse of the calculator gives radiator, boiler and pipe sizes in addition to the above and may be used for complete installation design. Size: 7.5/8" dia. complete in case with instruction booklet.
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DOMESTIC HEATING CALCULATORS

For Complete Installation Design. Imperial and Metric
An instrument, simple and quick to use, which determines the heating requirements for older types of domestic premises and also the sizes of all the equipment needed for the installation. Gives answers close to those obtained by detailed calculation.

P/N 10460 Imperial model (for outside wall U values 0.1 to 0.37 Btu/ft ² /h/°F). P/N 10461 Metric model (for outside wall U values 0.6 to 2.1 W/m ² K). Size: 7.5/8" dia. Engraved in four colours. Complete in case with instruction booklet.

Simply set two dials to: length, width, height of room, temperature required and type of construction and the calculator gives immediately an assessment of the total heat required. Radiator, boiler and pipe sizes including smallbore and microbore are quickly obtained from the reverse side.

A preliminary pipe size for each circuit is indicated from the heat requirements and enables pipe layouts to be readily arranged. Alternative sizes are shown for small bore and microbore.

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INDUSTRIAL HEATING CALCULATOR

Metric only.
An instrument designed to simplify the calculations for all the larger heating installations where a full analysis of the heat losses must be made. Heat losses through the structure are handled on one side of the calculator, each wall, floor, window, etc. being treated individually by simply setting length to breadth, and using the temperature difference and the transmittance coefficient to obtain the heat loss. The heat loss from air change is obtained in a similar manner.

Complete in case with comprehensive instruction booklet. Size: 7.5/8" dia. Engraved in four colours.

The calculator has an ingenious method of fixing pipe sizes which saves considerable time. It is only necessary to decide what pressure loss can be allowed per metre run and all pipe sizes can be read off immediately according to kW load carried and flow to return temperature drop. At the same setting the water flow in the pipe is shown; or the pipe size can be obtained directly from the flow if desired. Radiator size, boiler size, pump size are also obtained on the reverse side and a further section gives heat losses from piping, either insulated or left bare.

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GAS FLOW CALCULATORS

For Steel and Cast Iron Pipes . Imperial and Metric.
A double-sided instrument for calculations relating to the flow of all gases. It has two pressure loss scales, one dealing with the majority of problems where the terminal pressure is substantially atmospheric and the other for pipes at pressures up to 275 bar. Handles all fuel gases, air, nitrogen, carbon dioxide, etc., and is widely used for sizing factory compressed air and fuel gas systems, pipelines in chemical works, coke ovens and process plants. Scale Ranges: diameter 10 to 1500 mm. Flow 1.1 to 400,000 m ³ /h. Length 3 to 1,000,000 m. Velocity Scales for high and low pressure on reverse. Size 7.5/8" diameter.
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GAS FLOW CALCULATORS

For Plastic and Copper Pipes. Imperial and Metric.
This calculator is similar to the above giving the pressure loss in plastic pipes for all fuel gases, air, nitrogen, carbon dioxide, oxygen and hydrogen. On the reverse there are velocity scales and scales to determine allowances for fittings. Scale ranges: diameter 10 to 500 mm. Flow 1 to 60,000 m ³ /h. Length 3 to 1,000,000 m. Can also be used for copper pipes. Size 7.5/8" diameter.
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COMBUSTION EFFICIENCY CALCULATOR

Metric only.
The efficiency of a boiler is determined largely by the heat lost to any excess air supplied and the loss in high temperature flue gases. This calculator determines this efficiency from the CO2 content of the flue gas and the flue gas temperature. At the same time it also indicates the percentage of excess air being supplied. Note: The Calculator is based on gross calorific values. Gives answers for coal, coke, Town gas, natural gas, fuel oils - residual and distillate. Size: 5.3/4" dia.single sided, complete in plastic case.
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PACKAGED AIR CONDITIONING CALCULATOR

Metric only.
The calculator is approved by the Air Conditioning Advisory Bureau. It has been specially produced to facilitate the design procedure for packaged systems developed by the Electricity Council and detailed in their guide for climatic and sunshine conditions in the UK. It uses a logical step by step method, easily followed, each part of the complex calculation being simplified and handled by a separate segment of the calculator. Solar heat gains and transmission heat gains, heat gain from air, and internal heat gains, are calculated to give the size of unit required. In addition the air condition of the air entering the evaporator may be determined. It will also perform all the usual calculations for estimating the winter heat loss, including both losses through the structure and air change.
Size :8.3/4" diameter complete with instruction booklet and work sheets.
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