一种简单且廉价的方法可以提高用爬行空间建造的房屋使用的热泵的效率，即使用爬行空间下方的土壤作为热源或热源。用于热泵室外机的水槽。空气在经过室外机盘管之前，先经过土壤预处理。建立了爬行空间内的传热模型，并编写了一个计算机程序，用于计算包含土壤蒸汽扩散引起的热泵潜热传递的爬行空间内随时间变化的土壤和空气温度。为了匹配模拟的土壤和空气温度，对土壤中的蒸汽扩散进行了各种假设。 该模型与季节性能因子热泵模型一起，与仪表房的数据进行了比较，然后用于预测不同于实验评估爬行空间的爬行空间的供暖季节爬行空间热泵性能。结果包括:单通道系统不适合冬季运行；在地面以上空间的墙壁上添加隔热层只会略微提高性能；与传统安装的热泵相比，美国北部地区的爬行式空间热泵可以显著减少供暖季节所需的能源。引文:ASHRAE Transactions，1984年，第90卷，pt。 佐治亚州亚特兰大1A

A simple and inexpensive way to increase the efficiency of heat pumps used with houses built with crawlspaces is to use the soil beneath the crawlspace as a heat source or heat. Sink for the outdoor unit of the heat pump. Air is preconditioned by the crawlspace soil before passing over the outdoor unit coil.A model of heat transfer in a crawlspace was developed, and a computer program written to calculate time dependent soil and air temperatures in a crawlspace containing a heat pump Latent heat transfer resulting from soil vapor diffusion was included in the model. Various assumptions regarding vapor diffusion in soils were made in order to match simulated soil and air temperatures. This model, together with the seasonal performance factor heat pump model, was compared with data from an instrumented house and then used to predict heating season crawlspace heat pump performance for crawlspaces different from the experimentally evaluated crawlspace. Results included: a single pass system is not suited for winter operation; adding insulation to the walls of an above-grade crawlspace only improves performance slightly; a crawlspace heat pump in a northern region of the United States could significantly reduce heating season purchased energy compared to a conventionally installed heat pump.