Analysis of the Thermal Effect About Groundwater Flowing to the Nest of Tubes Heat Transfer

Abstract

Traditional way of heating is mainly by high grade fossil energy, as a device which consume part of high energy, heat pump can lead the heat flow from low temperature heat source to high temperature heat source as reported by Li (Conserv Environ Prot 11:66–67, 2004) [1], which is the most economic and effective technology to reduce CO₂ emissions, is one of the key technology of building energy efficiency and reduce CO₂ emissions. With the large-scale application of soil source coupling heat pump, the influence factors are also appeared. Accordingly, the effect of the groundwater flow on nest of tubes heat transfer performance is especially obvious. This paper simulated the fluid in the tube,the nest of tubes,the surrounding soil under storage conditions, based on the nest of tubes of heat seepage coupling heat transfer model. This paper studied the influences of groundwater seepage to the heat of nest of tubes, at the same time make a comparison to the no seepage condition. It shows that groundwater seepage compared to no seepage condition can effectively reduce the outlet temperature of the buried pipe. In the 80–400 m/y seepage velocity range, unit well depth in heat changes linearly with the seepage flow velocity roughly. If the seepage velocity is 500 m/y, its unit well depth in heat increases about 79.73 %. In the system design; we should consider this influence factor. Otherwise, there will be a great bias. When considering seepage factor, the heat transfer rate of per unit length increase, so we can reduce the design capacity, and thus make the system better and save the resources.