Manual 02 - Section 06







Non-Residential Solar Information Manual
SECTION 6: Typical Collector Arrays and Pipe Sizes

6.1 INTRODUCTION

All four Solahart collector models I, J, K and L are suitable for Non Residential system applications.

Refer Residential Solar Information Manual for technical data and all other information on these collectors.

The collectors can be arranged in series, parallel or series-parallel formats dependant upon the end user requirements, installation space restrictions and radiation levels for the particular location.

It is important to ensure that the collector array is installed to facilitate complete drain back of the closed circuit fluid into the Heat Store when the circulation pump is OFF.

6.2 PIPE SIZING

The table below gives the recommended minimum pipe sizes relative to the number of collectors to be installed.

Collector flow is based on a rate of 40 litres per hour per square metre, or 16'C temperature rise @ 1000 W/m2 radiation with 75% collector efficiency.

Use this table as a guide to size pipe runs to each bank of collectors.

  No. of Collectors       Typical Maximum Flow      Minimum Pipe Size
                            L/min     US gpm               NB

       0 - 27                 21         6                 20
      28 - 54                 67        18                 25
      55 - 100               124        33                 32
     101 - 200               250        67                 40

For alternative pipe sizes the following graph shows the relationship between the number of collectors, pipe sizes and the pipe head loss due to flow. When selecting from this graph work only between the recommended guide lines drawn on the graph.

6.3 TYPICAL COLLECTOR ARRAYS AND CONNECTIONS

Every collector array installation must be individually inspected and designed to accommodate the required number of collectors and to achieve the optimum orientation for array.

Shown below are five typical collector array configurations which can be used in the design process:

Where hot water is required at a higher than normal temperature eg. dairies etc. a series arrangement is recommended.

1) ALL COLLECTOR BANKS IN PARALLEL

2) FOUR COLLECTORS IN SERIES AND PARALLEL CONNECTED

3) THREE COLLECTOR BANKS IN PARALLEL WITH DRAIN BACK CHECK VALVES

4) THREE BANKS OF COLLECTORS IN SERIES

5) ALL COLLECTOR BANKS IN PARALLEL WITH DRAIN BACK VALVES