Heat Distribution

Abstract

All heating systems must fulfil the following needs:

• (a) Provision of the desired environmental temperatures during periods of the coldest weather that can reasonably be expected. This requirement covers the capacity of both the heat production and distribution systems.

• (b) The capability of close control; this will usually involve automatic control on all but the smallest greenhouse.

• (c) Rapid response to changes in external conditions. This criterion is more easily met by modern low-inertia systems, based on high-speed hot water, steam or blown warm air suppliers.