The invention provides a method of demand management for fluid networks. The method includes the steps of providing a computer controlled fluid network for delivery of fluid to at least one customer (14), maintaining a real time database (16) within the computer controlled fluid network of predetermined parameters, requesting a flow rate and time of delivery of said fluid from the fluid network through a user interface (22) to a customer (20), determining, using predetermined parameters from the real time database (16), the availability (24) of providing delivery of fluid from the fluid network to the customer (14) based on hydraulic capacity of the fluid network, and, if the hydraulic capacity is available, calculating parameters (38) using the real time database (16) to deliver fluid to the customer (14) through the computer controlled fluid network.

A sweating simulator has a foundation panel (14), a panel (1) and a temperature control panel (2), a fixture for fixing a specimen, a container (7) for holding simulated sweat, a container (15) for collecting the simulated sweat, and a plurality of weighing scales for measuring masses of the simulated sweat supplied, evaporated and dripped from the specimen, respectively. The panel (1) and temperature control panel (2) constitute a simulated sweating plane for simulating wetting properties and temperature of skin. An upper middle position of the temperature control panel (2) has a sweating zone (3), which has a plurality of sweating pores (4). The temperature control panel (2) has a temperature sensor (8) and a heating element to control the temperature of the temperature control panel (2) around 33-35 C. to simulate the temperature of the human skin surface. The sweating rate of the sweating zone (3) is in the range of about 1 to 624 ml/h or about 0.004 to 2.5 L/h-m.sup.2 to simulate various sweating intensities.