PCM glazing systems

Abstract

SUMMARYThis paper presents a different approach for thermal effective windows, i.e. windows that reduce the energy transmitted into or out of a room. The idea is to use a double sealed glass filled with a phase change medium (PCM) whose fusion temperature is determined by solar-thermal calculations. The PCM used is polypropylene glycol. The investigation includes modelling of the heat and radiation transfer through a composite window and optical investigation of conventional and PCM filled windows, testing of the window and comparison with numerical simulations. A onedimensional model for the composite glass window is developed to predict the thermal performance as a function of the geometrical parameters of the panel and the PCM used. Optical measurements were realized using photo-spectrometry to determine the transmittance, reflectance and absorptance. The specimens used include single glass of different thicknesses, double glass of different gap spacing and thicknesses filled with air or PCM, and finally coloured PCM. The results indicate big reductions in the energy transmitted, specially in the infra-red and ultraviolet regions, while maintaining a good visibility.

Infrared Regulating Smart Window Based on Organic Materials

“…[105] The PCM takes advantage of the latent heat storage potential in the phase transition between the liquid and solid states. This transition can be used for heat storage and by increasing the thermal inertia of the window, which both aid in maintaining interior temperatures.…”

“…Phase change materials (PCMs) have most often been applied to opaque elements but there are examples of application in window systems . The PCM takes advantage of the latent heat storage potential in the phase transition between the liquid and solid states.…”

Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis

“…• in all the papers, the PCM had been macro-encapsulated in containers, that is, glass containers (70%) [12][13][14][15][20][21][22][23][24][25]27,[30][31][32][33][34][35][38][39][40][41], polycarbonate containers (20%) [16,17,19,28,36,42] and aluminium containers (10%) [18,26,29]; • the technologies had predominantly been characterised in outdoor test cells (57%) [14,15,17-22, 24-27,29,31,35] and through laboratory analysis (53%) [12,13,17,20,23,[32][33][34][35][36][37][38][39][40][41][42], while some other studies had been carried out by coupling a modelling activity with an experimental activity (37%) …”

“…The transparent façade system developed by Ismail et al [38][39][40] is a double glass unit containing a moving PCM curtain controlled by an electric pump. They conducted experimental investigations using spectrophotometry, which indicated a considerable reduction in the infrared and ultraviolet radiations while preserving good visibility, and the use of coloured PCMs, in particular the green ones, seems to be more effective in reducing radiated energy gains.…”

Zastosowania Materiałów PCM We Współpracy Z Przegrodami Transparentnymi

“…Kolejne wykorzystanie PCM w przegrodach przeziernych zostało opisane w [13]. Autor przedstawił wyniki badań użycia glikolu propylenowego (organicznego PCM) wewnątrz jednokomorowego zespołu szybowego w celu zmniejszenia ilości energii przekazywanej do pomieszczeń.…”