Mediaeval churches hold substantial historical and cultural values, organs, altars, paintings that need to be preserved. Many of these churches have no climate control systems installed. Thus the indoor climate is mainly determined by the outdoor climate. Focus in this study is on the possibilities to improve indoor climate in originally unheated churches to prevent and protect churches from mo...

Heat pipes, as two-phase heat transfer devices with extremely high effective thermal conductivity. They can be cylindrical or planar in structure. Heat pipes can be embedded in a metal cooling plate, which is attached to the heat source, and can also be assembled with fin stack for fluid heat transfer. Due to the high heat transport capacity, heat exchangers with heat pipes have become much sma...

supersonic separators have found extensive applications in dehumidification of natural gases since 2003. unlike previous studies, which have investigated the inlet conditions and nozzle geometry of supersonic separators for pure fluids, the present study employed a combination of momentum, heat, and mass transfer equations along with virial equation of state (eos) to inspect the effect of inlet...

This paper describes the design and performance analysis of a variable-capacity heat pump system developed for a small [1800ft (167 m)] prototype net ZEH with an average design cooling load of 1.25 tons (4.4 kW) in five selected US climates. The heat pump integrates space heating and cooling, water heating, ventilation, and humidity control (humidification and dehumidification) functions into a...

In this paper exergy analysis is used to assess the performance of the three most common air conditioning plant schemes: all-air, dual-duct and fan-coil systems. The results are presented in terms of flow diagrams to provide a clear picture of the exergy flow across the systems. The most relevant outcomes are that the air cooling and dehumidification is the process most responsible for the exer...

The turbine floor of the main plant is an important part in underground pumped storage hydropower plants.The health personnel and safe operation equipment are endangered due to high space humidity water seepage through walls. In this paper, numerical simulations were used study thermal environment summer. Two working conditions with without dissipation computed compared. psychrometric chart was...

Humidification dehumidification desalination (HDH) is a promising technology for small-scale water production applications. There are several embodiments of this technology which have been investigated by researchers around the world. However, from a previous literature review [1], we have found no study which carried out a detailed thermodynamic analysis in order to improve and/or optimize the...

Abstract The space environment has high vacuum, rapid temperature alternations and other extreme conditions, which can affect the energy, ignition rate performance of solid propellants in environment. In order to obtain aging HTPB propellant, this paper investigates propellant vacuum compares it with atmospheric pressure, analyses oxidative cross-linking, degradation chain scission “dehumidific...