Concerning practical water network section, change in local resistance factor is result of any kind of valve closings or openings. Based on the developed model of water heating system network, the matter of the study will be the influence of the in local resistance to overall network resistance, and to the pump operating point. Radiator valve movement causes changes in flow rates, i. e. velocity in all network circuits, and has its further result in change in resistance factors, of the Reynolds number and in fluid friction coefficient.

A hourly simulation in dynamic conditions of building-plant system is able to give a rigorous evaluation of seasonal performances of a heat pump using outside air as cold source. However in professional applications we have often the necessity of speed estimation of the energetic and economic opportunities of its introduction whose advantages are not always real and sure. For this reason various simplified methods have been proposed. A new procedure to estimate seasonal performances of an air source heat pump is proposed here, based on utilization factor method.

One of the great influential feature on room temperature distribution is the insulation quality of the room. Each room of the typical Japanese modern house has a low heat capacity, high insulation quality and large windows which are less insulated. Temperature near the window is naturally low. These factors make the thermal insulation of the room strongly uneven. When heating the room, the location of the heat source largely affects room temperature distribution as well. This kind of distribution will be emphasized using an air-conditioner.

The objective of this work is to train an artificial neural network (ANN) to learn to predict the required heating load of buildings with the minimum of input data. An ANN has been trained based on 250 known cases of heating load, varying from very small rooms (1-2 mP2P) to large spaces of 100 mP2P floor area. The type of rooms varied from small toilets to large classroom halls, while the room temperatures varied from 18C to 23C. In addition to the above, an attempt was made to use a large variety of room characteristics.

In order to optimise new buildings designers need calculation methods which help them to assess the effect of design choice on energy consumption and expenses. AICVF the French association of heating, ventilation and air conditioning engineers proposes guidelines presenting different types of methods to assess energy consumption for all energy uses. In particular, one of these methods developed by CSTB and AICVF takes account of intermittent space heating and enables the calculation of monthly energy requirements and expenses.

The aim of this work is the realization of a design tool, which is a multiple model software called « CODYRUN », suitable for professionnals and usable by researchers. The original aspect of this software is that the designer has at his disposal a wide pa

It is well-known that there exist indoor temperature distributions. To have more precise predictions of indoor thermal comfort and better control of indoor thermal conditions, a both detailed and fast model of the dynamic indoor temperature distributions is needed. Unfortunately, very few papers studied such models due to the complexity of fluid (air) flows. CFD can be used as a detailed model. But it is too time consuming. This paper discusses two models in this respect, the fixed-flow-field model and air-zonal model. Both models are validated with experimental results.

The research we develop consists of evaluating "radiative comfort" during no heating periods in office buildings.The expression "radiative comfort" is used to characterise the thermal and visual component of the feeling of people set in indoor environments submitted to sky and sun irradiation by bay windows. Two numerical models, one for the visual behaviour and the other for the thermal aspect, have been adjusted We carried out simulations in the case of offices which is the main scope of our study.