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Greenhouse Unit Heaters: Types, Placement and Efficiency

机译:温室单元加热器:类型,布置和效率

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Unit heaters for greenhouses typically use propane or natural gas fuel but may also be fueled with heating oil. They are popular because of their low capital and installation cost, high reliability, and the ability to stage operation of multiple heaters. There are two main types of unit heaters that are used for space heating in greenhouses: vented and unvented. The traditional vented, gas-fired unit heater transfers heat from the combustion gases to the air through a heat exchanger, and the combustion gases are exhausted through a flue pipe outside the greenhouse. An unvented unit heater burns the gas and exhausts all combustion gases directly into the greenhouse, so virtually all the heat from the fuel is used to heat the air. Let's take a look at each of these technologies.
机译:用于温室的单元加热器通常使用丙烷或天然气燃料,但也可以使用取暖油作为燃料。它们之所以受欢迎,是因为它们的投资成本和安装成本低,可靠性高以及能够分阶段运行多个加热器。有两种主要类型的单元加热器用于温室大棚的加热:通风和不通风。传统的带燃气的单元加热器通过热交换器将热量从燃烧气体传递到空气,燃烧气体通过温室外的烟道排出。未通风的单元加热器燃烧气体并将所有燃烧气体直接排放到温室中,因此,几乎所有来自燃料的热量都用于加热空气。让我们看一下每种技术。

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